CN115334874A

CN115334874A - Temperature control method, temperature control device, temperature control program, and temperature control system

Info

Publication number: CN115334874A
Application number: CN202180024068.1A
Authority: CN
Inventors: 松本幸则; 藤原诚二; 中西保之; 三添英朗
Original assignee: Panasonic Holdings Corp
Current assignee: Panasonic Holdings Corp
Priority date: 2020-04-09
Filing date: 2021-03-17
Publication date: 2022-11-11
Anticipated expiration: 2041-03-17
Also published as: WO2021205833A1; CN115334874B; TW202139827A

Abstract

The invention provides a temperature control method, a temperature control device, a temperature control program and a temperature control system. A temperature control method in a temperature control device (1) acquires the internal temperature and the internal humidity of a cultivation facility (100), and controls the internal temperature of the cultivation facility (100) by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode causes an air conditioning device (14) to operate so that the internal temperature reaches a predetermined target temperature in a state in which openable and closable side windows (121) and a louver (171) that separate the inside of the cultivation facility (100) from the outside are closed, the 2 nd operation mode calculates the internal dew point temperature of the cultivation facility (100) on the basis of the internal temperature and the internal humidity, the air conditioning device (14) is operated so that the surface temperature of fruits is higher than the internal dew point temperature in a state in which the side windows (121) and the louver (171) are closed, and the 3 rd operation mode causes the air conditioning device (14) to stop in a state in which the side windows (121) and the louver (171) are opened.

Description

Temperature control method, temperature control device, temperature control program, and temperature control system

Technical Field

The present invention relates to a technique for controlling the internal temperature of a fruit cultivation facility.

Background

In the agricultural field, facility cultivation using a steel frame greenhouse, a pipeline greenhouse, or the like (hereinafter simply referred to as "greenhouse") has been widely spread in recent years.

The facility cultivation can realize environmental conditions different from the outside in the greenhouse by isolating the inside of the greenhouse for planting vegetables from the outside. Accordingly, the influence of weather or meteorological conditions is suppressed to a small extent, and vegetables can be grown for a long period of time or all the year round, thereby realizing stable vegetable supply. Furthermore, vegetables can be grown and produced even in areas where vegetables have been difficult to grow in the past, local consumption by local production is achieved, and food mileage is reduced, and thus attention is paid from the viewpoint of SDGs (sustainable development targets).

Generally, it is known that the fruit is more delicious as the difference between the day and night is larger.

However, for example, in subtropical regions, there is almost no difference between day and night cold and warm. Therefore, it is conceivable that the cooling device cools the interior of the greenhouse at night to cause a difference between day and night coldness and warmth.

Here, since the cooling device cools the interior of the greenhouse at night, it is necessary to close an openable window provided in the greenhouse. However, if the window of the greenhouse is closed during the day, the temperature in the greenhouse becomes too high, so that the window needs to be opened during the day.

If the window is opened the next morning after the window is closed at night and the cooling device cools the greenhouse, the difference between the surface temperature of the fruit and the temperature in the greenhouse is large. When the cooled fruit comes into contact with high-temperature and high-humidity air from the outside, dew condensation may occur on the surface of the fruit. It is known that condensation on the surface of fruits is one of the causes of fruit dehiscence and is also a cause of infection with filamentous fungi (mold, etc.).

For example, patent document 1 discloses a fruit cracking prevention device that adjusts the temperature and humidity in a heating facility for cherries during the daytime to a value or less that allows water to evaporate from a tree body containing cherry fruits and that prevents condensation of the cherry fruits by adjusting the temperature in the heating facility for cherries.

However, in the above-described conventional technique, the temperature and humidity in the facility during the daytime are adjusted to values not higher than a value at which condensation of cherry fruits does not occur by adjusting the temperature in the facility based on the humidity in the facility, but the surface temperature of the fruits is not taken into consideration. Therefore, in the above-described conventional techniques, it is difficult to reliably prevent dew condensation from occurring on the surface of the fruit, and further improvement is required.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2002-153147

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide a technique capable of reliably preventing dew condensation from occurring on the surface of fruits.

A temperature control method according to an aspect of the present invention is a temperature control method for a temperature control device that controls an internal temperature of a facility in which fruit is cultivated, the temperature control method including the steps of: acquiring the internal temperature and the internal humidity of the cultivation facility; and controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

According to the present invention, condensation on the surface of the fruit can be reliably prevented.

Drawings

Fig. 1 is an overall view showing a configuration of a cultivation system according to embodiment 1 of the present invention.

Fig. 2 is a block diagram showing a configuration of a temperature control device according to embodiment 1 of the present invention.

Fig. 3 is a flowchart for explaining the temperature control process of the temperature control device 1 according to embodiment 1 of the present invention.

Fig. 4 is a flowchart for explaining the dew condensation prevention process in step S11 in fig. 3.

Fig. 5 is a flowchart for explaining the windowing process in step S12 in fig. 3.

Fig. 6 is a flowchart for explaining the windowing process according to modification 1 of embodiment 1 of the present invention.

Fig. 7 is a flowchart for explaining the dew condensation prevention process according to modification 2 of embodiment 1 of the present invention.

Fig. 8 is an overall view showing a configuration of a cultivation system according to embodiment 2 of the present invention.

Fig. 9 is a block diagram showing a configuration of a temperature control device according to embodiment 2 of the present invention.

Fig. 10 is a flowchart for explaining the condensation prevention process according to embodiment 2 of the present invention.

Fig. 11 is an overall view showing a configuration of a cultivation system according to embodiment 3 of the present invention.

Fig. 12 is a block diagram showing a configuration of a temperature control device according to embodiment 8 of the present invention.

Fig. 13 is a diagram showing an example of a surface temperature estimation table stored in a memory in embodiment 3 of the present invention.

Fig. 14 is a flowchart for explaining the condensation prevention process according to embodiment 3 of the present invention.

Detailed Description

(basic knowledge of the invention)

In the facility cultivation, fruit set, enlargement, and coloring are poor at a high temperature of 30 ℃ or higher. In addition, at 35 ℃ or higher, the fertilization rate of pollen decreases, and fruit drop occurs. In addition, when the temperature is high at night, consumption by respiration increases, and the fruit becomes enlarged and worsened. On the other hand, when the temperature during the day is 20 ℃ or lower and the temperature during the night is 4 to 8 ℃, differentiation and development of each organ of the flower are promoted, the number of ovary cells (ovary cells) is increased, and malformed fruits are often generated.

Further, the relative humidity is also in a suitable range, and for example, if the relative humidity exceeds 90%, diseases such as leaf mold are likely to occur. In addition, in an environment where the relative humidity is extremely high, dew condensation may occur on the surface of the fruit. Condensation on the fruit surface is said to cause cracking of the fruit. The cracked fruit is often of low commercial value and cannot be sold. Moreover, dew condensation on the fruit surface also causes disease transmission such as leaf mold.

On the other hand, when the relative humidity is extremely low, the plant closes the stomata to suppress excessive transpiration, thereby suppressing photosynthesis.

The control of the temperature and humidity in the greenhouse is sometimes manually performed by a vegetable producer, but in recent years, it is becoming more and more automatic by an integrated environment control device based on measurement data such as the temperature, humidity, and light quantity inside and outside the greenhouse. Further, the running cost of air conditioning equipment such as a heat pump air conditioner and a combustion heater is high. Therefore, in many cases, the use of air conditioners is suppressed to some extent, and control is performed in conjunction with ventilation, light shielding, and the like.

In the facility cultivation, the environment in the greenhouse is controlled so that the environment in the greenhouse is suitable for the growth of the plant (vegetable) to be cultivated, that is, the growth of the vegetable to be cultivated, by controlling side windows, skylights, ventilation fans, curtains, air conditioning equipment (heat pump air conditioners, combustion heaters, and the like), and environmental control equipment such as mist.

For example, in the case of cultivating tomatoes, the growth temperature is preferably in the range of 5 to 40 ℃, more preferably 10 to 35 ℃, the optimum temperature in the daytime is 25 to 30 ℃, and the optimum temperature at night is 10 to 15 ℃, and the environment is controlled so that the temperature in the greenhouse falls within the above-mentioned range.

In addition, the appropriate greenhouse environment is different during the day when photosynthesis is performed and during the night when only respiration is performed. In the case of tomatoes, the temperature in the greenhouse is controlled so that the temperature in the daytime is 25 to 30 ℃ as a target value and the temperature at night is 10 to 15 ℃ as a target value.

Therefore, when the temperature control is switched from the night temperature control to the daytime temperature control during one day, the temperature in the greenhouse changes greatly. At this time, the difference between the surface temperature of the fruit and the temperature in the greenhouse increases depending on the temperature and humidity in the greenhouse, and as a result, dew condensation may occur on the surface of the fruit.

Specific examples are as follows.

As a cultivation area, a humid and hot climate area represented by a subtropical area is assumed. In the humid and hot climate area, the temperature is high and the humidity is high no matter in the daytime or at night. In addition, in this area, cooling is performed by using a heat pump air conditioner or the like in a state where the greenhouse is closed at night. On the other hand, after sunrise, the temperature in the solar greenhouse increases, and thus the solar air conditioner cannot sufficiently cool the solar greenhouse. Therefore, the heat pump air conditioner is stopped during daytime, and outside air is actively introduced by ventilation. This suppresses an extreme temperature rise.

Here, consider the case of cultivating tomatoes. The temperature control for cooling the interior of the greenhouse by the heat pump air conditioner at night is switched to the temperature control for introducing outside air before and after sunrise, but dew condensation may occur on the tomato fruits at the time of the switching.

This is because of the following reasons.

(1) During the night cooling, the temperature in the greenhouse is lower than the temperature of the outside air, and the temperature of the tomato fruit is also lowered.

(2) When the temperature control for introducing the outside air is switched, air having a higher temperature and a higher humidity than the inside of the greenhouse flows in.

(3) Tomato fruits have a large thermal capacity. Therefore, even if the ambient temperature suddenly rises, the temperature of the tomato fruit rises slowly.

(4) As a result, immediately after switching to the temperature control for introducing the outside air, the high-temperature and high-humidity air flowing into the greenhouse is cooled by the tomato fruits. Since the air around the tomato fruits is lower than the dew point temperature, dew condensation occurs on the surfaces of the tomato fruits.

In order to solve the above problems, a temperature control method according to an aspect of the present invention is a temperature control method of a temperature control device that controls an internal temperature of a facility for cultivating fruit, the temperature control method including the steps of: acquiring the internal temperature and the internal humidity of the cultivation facility; and controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

According to this configuration, the air conditioning system operates so that the internal temperature of the cultivation facility reaches a predetermined target temperature in a state where the window is closed at night. The air conditioning apparatus operates in such a manner that the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility in a state where the window is closed from before sunrise to after sunrise. Then, if the inside temperature of the cultivation facility approaches the outside temperature of the cultivation facility, the air conditioning apparatus is stopped in a state where the window is opened. Therefore, when the window is opened after sunrise, the internal temperature of the cultivation facility approaches the external temperature of the cultivation facility, and the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility, so that dew condensation on the surface of the fruit can be reliably prevented.

In the temperature control method, the mode may be changed from the 2 nd operation mode to the 3 rd operation mode after a predetermined time has elapsed from sunrise time.

According to this configuration, the air conditioner operates such that the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility in a state where the window is closed until a predetermined time elapses from the sunrise time, and the air conditioner stops in a state where the window is opened after the predetermined time elapses from the sunrise time. Therefore, the predetermined time is set to a time at which the internal temperature of the cultivation facility approaches the external temperature of the cultivation facility, and thus the occurrence of dew condensation on the surface of the fruit can be reliably prevented.

In the temperature control method, the mode may be changed from the 2 nd operation mode to the 3 rd operation mode when the internal temperature reaches a temperature at which the fruit grows to a limit.

According to this configuration, the air conditioner operates so that the surface temperature of the fruit becomes higher than the internal dew point temperature of the cultivation facility in a state where the window is closed until the internal temperature reaches the temperature at which the fruit grows to the limit, and the air conditioner stops in a state where the window is opened when the internal temperature reaches the temperature at which the fruit grows to the limit. Therefore, when the internal temperature of the cultivation facility reaches the temperature at which the fruit grows to the limit, the internal temperature of the cultivation facility approaches the external temperature of the cultivation facility or exceeds the external temperature, and condensation can be prevented from occurring on the surface of the fruit even if the window is opened.

In the temperature control method, the outside temperature and the outside humidity of the cultivation facility may be acquired; calculating an outside dew point temperature of the cultivation facility based on the outside temperature and the outside humidity, and shifting from the 2 nd operation mode to the 3 rd operation mode in a case where a surface temperature of the fruit is higher than the outside dew point temperature.

According to this configuration, when the surface temperature of the fruit is equal to or lower than the external dew point temperature of the cultivation facility, the air conditioning device operates such that the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility in a state where the window is closed, and when the surface temperature of the fruit is higher than the external dew point temperature of the cultivation facility, the air conditioning device stops in a state where the window is opened. Therefore, when the window is opened, the surface temperature of the fruit is higher than the external dew point temperature of the cultivation facility, and therefore, dew condensation can be prevented from occurring on the surface of the fruit.

In the temperature control method, the surface temperature of the fruit may be acquired from a sensor that measures the surface temperature of the fruit in the 2 nd operation mode.

According to this configuration, since the accurate surface temperature of the fruit is acquired from the sensor that measures the surface temperature of the fruit, the occurrence of dew condensation on the surface of the fruit can be prevented more reliably.

In the temperature control method, the surface temperature of the fruit may be estimated in the 2 nd operation mode.

According to this configuration, since the surface temperature of the fruit is estimated, a sensor for measuring the surface temperature of the fruit is not required, and the structure can be simplified.

In the temperature control method, the estimated values may be extracted from a table in which the estimated values of the internal temperature of the cultivation facility at the time of transition to the 2 nd operation mode, the elapsed time from the time of transition to the 2 nd operation mode, and the surface temperature of the fruit are associated with each other, and the estimated values may be associated with the internal temperature at the time of transition to the 2 nd operation mode, and the elapsed time from the time of transition to the 2 nd operation mode.

According to this configuration, the surface temperature of the fruit can be easily estimated based on the internal temperature at the time of transition to the 2 nd operation mode and the elapsed time from the transition to the 2 nd operation mode.

In the temperature control method, the window may be opened step by step at predetermined time intervals in the 3 rd operation mode.

According to this configuration, the window is gradually opened at predetermined time intervals, and therefore, the internal temperature of the cultivation facility can be gradually brought close to the external temperature of the cultivation facility.

A temperature control device according to an aspect of the present invention is a temperature control device for controlling an internal temperature of a facility for cultivating fruit, including: an acquisition unit that acquires the internal temperature and the internal humidity of the cultivation facility; and a control unit that controls the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

A temperature control program according to an aspect of the present invention is a temperature control program for controlling an internal temperature of a facility for cultivating fruit, the temperature control program causing a computer to function as: acquiring the internal temperature and the internal humidity of the cultivation facility; and controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

One aspect of the present invention relates to a temperature control system comprising: a temperature control device for controlling the internal temperature of the fruit cultivation facility; an air conditioning device; and an openable and closable window that can separate an inside from an outside of the cultivation facility, wherein the temperature control device includes: an acquisition unit that acquires an internal temperature and an internal humidity of the cultivation facility; and a control unit that controls the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode causes the air conditioner to operate such that the internal temperature reaches a predetermined target temperature in a state where the window is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, the air conditioner is operated such that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode causes the air conditioner to stop in a state where the window is opened.

A temperature control method according to another aspect of the present invention is a temperature control method for a temperature control device for controlling an internal temperature of a facility for cultivating fruit, including the steps of: acquiring a surface temperature of the fruit from a sensor measuring the surface temperature of the fruit; and controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

A temperature control device according to another aspect of the present invention is a temperature control device for controlling an internal temperature of a facility for cultivating fruit, including: an acquisition unit that acquires the surface temperature of the fruit from a sensor that measures the surface temperature of the fruit; and a control unit that controls the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

According to this configuration, the air conditioning system operates so that the internal temperature of the cultivation facility reaches a predetermined target temperature in a state where the window is closed at night. From before sunrise to after sunrise, the air conditioning apparatus operates in such a manner that the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility in a state where the window is closed. Then, if the inside temperature of the cultivation facility approaches the outside temperature of the cultivation facility, the air conditioning apparatus is stopped in a state where the window is opened. Therefore, when the window is opened after sunrise, the internal temperature of the cultivation facility approaches the external temperature of the cultivation facility, and the surface temperature of the fruit is higher than the internal dew point temperature of the cultivation facility, so that dew condensation on the surface of the fruit can be reliably prevented.

A temperature control program according to another aspect of the present invention is a temperature control program for controlling an internal temperature of a facility for cultivating fruit, the temperature control program causing a computer to function as: acquiring a surface temperature of the fruit from a sensor measuring the surface temperature of the fruit; and controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates an air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operates the air conditioner so that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode stops the air conditioner in a state where the window is opened.

Another aspect of the invention relates to a temperature control system comprising: a temperature control device for controlling the internal temperature of the fruit cultivation facility; an air conditioning device; an openable and closable window that can separate the inside from the outside of the cultivation facility; and a sensor measuring a surface temperature of the fruit, wherein the temperature control device includes: an acquisition unit that acquires the surface temperature of the fruit from the sensor; and a control unit that controls the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode causes the air conditioner to operate such that the internal temperature reaches a predetermined target temperature in a state where the window is closed, the 2 nd operation mode calculates an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, the air conditioner is operated such that a surface temperature of the fruit is higher than the internal dew point temperature in a state where the window is closed, and the 3 rd operation mode causes the air conditioner to stop in a state where the window is opened.

Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are merely examples embodying the present invention, and do not limit the technical scope of the present invention.

(embodiment mode 1)

Fig. 1 is an overall diagram showing a configuration of a cultivation system according to embodiment 1 of the present invention.

The cultivation facility 100 is an apparatus for cultivating the fruit 10 separately from the outside. Specifically, the cultivation facility 100 is a steel frame greenhouse or a duct greenhouse surrounded by polyolefin, polyvinyl chloride, fluorine-based film, or the like. The fruit 10 is, for example, a tomato fruit.

The cultivation system shown in fig. 1 includes a temperature control device 1, an internal temperature/humidity measurement device 11, a side window drive device 12, a ventilation fan 13, an air conditioning unit 14, a surface temperature measurement device 15, a louver drive device 17, a side window 121, and a louver 171.

The internal temperature and humidity measuring device 11 measures the internal temperature and the internal humidity of the cultivation facility 100. The internal temperature/humidity measurement device 11 includes a temperature sensor 141 and a humidity sensor 142. The temperature sensor 141 measures the internal temperature of the cultivation facility 100. The humidity sensor 142 measures the internal humidity of the cultivation facility 100. The internal humidity is the relative humidity within the cultivation facility 100. The temperature sensor 141 and the humidity sensor 142 are provided at arbitrary positions in the cultivation facility 100.

The temperature control device 1 controls the internal temperature of the facility 100 for cultivating the fruit 10. The temperature control device 1 determines the degree of separation between the inside and the outside of the cultivation facility 100 and the degree of change in the temperature and humidity in the cultivation facility 100 based on the data input from the internal temperature/humidity measurement device 11.

The air conditioner 14 changes the temperature and humidity in the cultivation facility 100 by, for example, a heat pump. The air conditioner 14 cools the inside of the cultivation facility 100 by the cooling function, and heats the inside of the cultivation facility 100 by the heating function. When the air conditioner 14 is operated, the ventilation fan 13 is stopped and the side windows 121 and the louver 171 are closed, so that the interior of the cultivation facility 100 can be efficiently cooled or heated. In particular, at night, the temperature control device 1 operates the air conditioner 14 in a state where the ventilation fan 13 is stopped and the side windows 121 and the louver 171 are closed.

The air conditioner 14 may include a plurality of air conditioning components. For example, the air conditioner 14 may include a plurality of heat pumps. Some of the plurality of heat pumps may perform a cooling operation, while the other heat pumps perform a heating operation. Accordingly, the temperature and humidity in the cultivation facility 100 can be accurately controlled. Furthermore, the air conditioning system 14 may also include a heat pump and a combustion-type heater. The heating function of the air conditioner 14 may be realized by operating a combustion heater. The air conditioner 14 may include a dehumidifier as an air conditioner constituent device.

The ventilation fan 13 is provided at an upper portion of a side surface (generally, a surface in the width direction) of the cultivation facility 100, and forcibly discharges air in the cultivation facility 100 to the outside.

The temperature inside the cultivation facility 100 rises due to the incidence of sunlight and becomes higher than the outside air temperature of the cultivation facility 100. In particular, high-temperature air tends to stay at the upper part of the cultivation facility 100, and the ventilation fan 13 discharges the high-temperature air to the outside, thereby suppressing a temperature rise in the cultivation facility 100. The cultivation system may not include the ventilation fan 13.

The side window 121 is openable and closable to separate the inside of the cultivation facility 100 from the outside. The side window 121 is a cover film that covers the side surface (longitudinal surface) of the cultivation facility 100. A straight pipe for winding the cover film is provided below the cover film, and the side window 121 on the side of the cultivation facility 100 is opened and closed by the rotation of the straight pipe.

The louver 171 is openable and closable to partition the inside of the cultivation facility 100 from the outside. The louver 171 is provided at an upper portion of the cultivation facility 100.

When side window 121 and louver 171 are closed, the temperature inside cultivation facility 100 rises due to the incidence of sunlight and becomes higher than the outside air temperature of cultivation facility 100. When side window 121 and louver 171 are opened, outside air is introduced into cultivation facility 100, and therefore, a temperature rise in cultivation facility 100 can be suppressed.

The side window driving device 12 opens and closes the side window 121 in accordance with a control signal from the temperature control device 1. The side window driving device 12 automatically opens and closes the side window 121 by rotating a straight pipe provided at a lower portion of the side window 121. The side window 121 may be opened and closed manually. When the side window 121 is manually opened and closed, the side window driving device 12 is not necessary.

The sunroof driving device 17 automatically opens and closes the sunroof 171 in accordance with a control signal from the temperature control device 1. Further, the louver 171 may be manually opened and closed. In the case where sunroof 171 is opened or closed manually, sunroof driving device 17 is not required.

The temperature sensor 141 and the humidity sensor 142 transmit the measured data to the temperature control device 1. The temperature sensor 141 and the humidity sensor 142 may transmit voltage outputs corresponding to the values of temperature and humidity through cables, for example. The temperature sensor 141 and the humidity sensor 142 may transmit the temperature and the humidity as digital signals through a network such as a LAN (local area network).

The surface temperature measuring device 15 is, for example, a radiation thermometer, and measures the surface temperature of the fruit. The surface temperature measuring device 15 measures the surface temperature of at least 1 fruit among the plurality of fruits in the cultivation facility 100. The surface temperature measuring device 15 transmits the measured surface temperature of the fruit to the temperature control device 1.

Hereinafter, a temperature control method for cooling the inside of the cultivation facility 100 at night and introducing outside air into the cultivation facility 100 after sunrise will be described on the premise of fruit cultivation.

In addition, the cultivation area is premised on a warm area. In this case, the outside air temperature at night is, for example, 26 ℃, the outside air humidity at night is, for example, 90%, the outside air temperature during day is, for example, 32 ℃, and the outside air humidity during day is, for example, 60%.

At night, the ventilation fan 13 is stopped, the side windows 121 and the louver 171 are closed, and the air conditioning equipment 14 performs a cooling operation. Here, in the present embodiment, a case where the internal temperature of the cultivation facility 100 is set to be lower than the external air temperature by about 5 ℃. At this time, the internal temperature of the cultivation facility 100 is, for example, 21 ℃.

In this situation, when the air conditioner 14 is stopped and the ventilation fan 13 is operated at sunrise, the side windows 121 and the louver 171 are fully opened, and the outside air having a temperature of 26 ℃ and a humidity of 90% is introduced into the cultivation facility 100, the temperature of the fruit is 21 ℃, and therefore the air around the fruit is cooled to 21 ℃. Since the dew point temperature of the outside air having a temperature of 26 ℃ and a humidity of 90% is about 24.2 ℃, the air temperature around the fruit becomes the dew point temperature or less, and condensation occurs on the fruit.

Therefore, in order to prevent dew condensation of the fruit, the temperature of the fruit needs to be higher than the dew point temperature of the outside air when the outside air is introduced.

Fig. 2 is a block diagram showing the configuration of a humidity control device according to embodiment 1 of the present invention.

The temperature control device 1 shown in fig. 2 includes a processor 101 and a memory 102.

The Memory 102 is a storage device capable of storing various information, such as a RAM (Random Access Memory), an SSD (Solid State Drive), a flash Memory, or the like.

The processor 101 is, for example, a CPU (central processing unit), and includes an internal temperature/humidity acquisition unit 111, a fruit surface temperature acquisition unit 112, and a temperature control unit 113.

The internal temperature/humidity acquisition unit 111 acquires the internal temperature and the internal humidity of the cultivation facility 100 measured by the internal temperature/humidity measurement device 11. The internal temperature/humidity obtaining unit 111 periodically obtains the internal temperature and the internal humidity from the internal temperature/humidity measuring device 11 at predetermined time intervals.

The fruit surface temperature acquiring unit 112 acquires the fruit surface temperature measured by the surface temperature measuring device 15. The fruit surface temperature acquiring unit 112 periodically acquires the fruit surface temperature from the surface temperature measuring device 15 at predetermined time intervals.

The temperature control unit 113 controls the internal temperature of the cultivation facility 100 by sequentially switching the 1 st operation mode, the 2 nd operation mode, and the 3 rd operation mode. Here, in the 1 st operation mode, the air conditioner 14 is operated so that the internal temperature reaches a predetermined target temperature in a state where the openable and closable side windows 121 and the louver 171 that partition the inside of the cultivation facility 100 from the outside are closed. In the 2 nd operation mode, the internal dew point temperature of the cultivation facility 100 is calculated based on the internal temperature and the internal humidity, and the air conditioning facility 14 is operated so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature in a state where the side windows 121 and the skylight 171 are closed. In the 3 rd operation mode, the air conditioner 14 is stopped with the side windows 121 and the louver 171 open.

The temperature control section 113 includes a 1 st operation mode control section 131, a 2 nd operation mode control section 132, and a 3 rd operation mode control section 133.

The 1 st operation mode control unit 131 determines whether or not the current time is the night cooling start time. The night cooling start time is, for example, sunset time. The 1 st operation mode control unit 131 also determines whether or not the current time is the dew condensation prevention processing start time. The dew condensation prevention processing start time is, for example, 3 hours before sunrise time. If the sunrise time is 6 am, the dew condensation prevention processing start time is 3 am. The 1 st operation mode control unit 131 determines that the current time is the night cooling start time and, when it is determined that the current time is not the dew condensation prevention processing start time, operates the air conditioner 14 so that the internal temperature reaches a predetermined target temperature while the side windows 121 and the louver 171 are closed.

The 1 st operation mode control portion 131 outputs a control signal for closing the side window 121 to the side window driving device 12, and outputs a control signal for closing the sunroof 171 to the sunroof driving device 17. Further, the 1 st operation mode control unit 131 operates the air conditioner 14 so that the internal temperature reaches a predetermined target temperature in a state where the side windows 121 and the louver 171 are closed. The predetermined target temperature is, for example, 21 ℃. The 1 st operation mode control unit 131 outputs a control signal to the air conditioning equipment 14 so that the internal temperature acquired by the internal temperature/humidity acquisition unit 111 reaches a predetermined target temperature.

For example, the 1 st operation mode control unit 131 outputs a control signal for changing the air conditioner 14 to the operating state to the air conditioner 14 when the internal temperature is higher than a predetermined target temperature and the air conditioner 14 is in the stopped state. Further, the 1 st operation mode control unit 131 does not output a control signal to the air conditioner 14 when the internal temperature is higher than the predetermined target temperature and the air conditioner 14 is in the operating state. Further, the 1 st operation mode control unit 131 does not output a control signal to the air conditioner 14 when the internal temperature is equal to or lower than the predetermined target temperature and the air conditioner 14 is in the stopped state. Further, the 1 st operation mode control unit 131 outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14 when the internal temperature is equal to or lower than the predetermined target temperature and the air conditioner 14 is in the operating state.

When the 1 st operation mode control unit 131 determines that the current time is the dew condensation prevention processing start time, the 2 nd operation mode control unit 132 calculates the internal dew point temperature of the cultivation facility 100 based on the internal temperature and the internal humidity, and operates the air conditioning equipment 14 so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature in a state where the side windows 121 and the louver 171 are closed.

The 2 nd operation mode control unit 132 determines whether or not the current time is the condensation prevention processing completion time. The condensation prevention processing end time is a time when a sufficient time has elapsed from the sunrise time, and is, for example, 8 am. The memory 102 may store a predetermined condensation prevention processing termination time.

The condensation prevention processing end time may be a time when a predetermined time has elapsed from the sunrise time. The 2 nd operation mode control unit 132 may shift from the 2 nd operation mode to the 3 rd operation mode after a predetermined time has elapsed from the sunrise time. The prescribed time is, for example, 2 hours. The condensation prevention processing end time may be changed depending on the season. The condensation prevention treatment completion timing may be determined according to the type or size of the fruit to be cultivated. The time when the internal temperature of the cultivation facility 100 rises due to sunrise and the fruit surface temperature is higher than the internal dew point temperature is set as the condensation prevention processing end time. The temperature of the fruit rises following the internal temperature of the cultivation facility 100. Therefore, the predetermined time can be obtained by estimation or experiment.

When determining that the current time is not the condensation prevention processing end time, the 2 nd operation mode control unit 132 calculates the internal dew point temperature of the cultivation facility 100 based on the internal temperature and the internal humidity, and operates the air conditioning equipment 14 so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature in a state where the side window 121 and the louver 171 are closed.

The 2 nd operation mode control unit 132 calculates the internal dew point temperature of the cultivation facility 100 based on the internal temperature and the internal humidity acquired by the internal temperature/humidity acquisition unit 111. The 2 nd operation mode control portion 132 calculates the internal dew point temperature based on the following expression (1).

Internal dew point temperature =237.3 log (internal water vapor pressure/6.11)/(7.5 log (10) + log (6.11/internal water vapor pressure)) (1)

The internal water vapor pressure is calculated based on the following formula (2).

Internal water vapor pressure =6.11 × 10^ (7.5 × internal temperature/(273.3 + internal temperature)) × internal humidity/100 (2)

The 2 nd operation mode control unit 132 operates the air conditioner 14 so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature when the side window 121 and the louver 171 are closed. That is, the 2 nd operation mode control unit 132 outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14 when the fruit surface temperature is higher than the internal dew point temperature and the air conditioner 14 is in the operating state. Further, the 2 nd operation mode control unit 132 does not output a control signal to the air conditioner 14 when the fruit surface temperature is higher than the internal dew point temperature and the air conditioner 14 is in the stopped state. Further, the 2 nd operation mode control unit 132B outputs a control signal for changing the air conditioner 14 to the operating state to the air conditioner 14 when the fruit surface temperature is equal to or lower than the internal dew point temperature and the air conditioner 14 is in the stopped state. Further, the 2 nd operation mode control unit 132 does not output a control signal to the air conditioner 14 when the fruit surface temperature is equal to or lower than the internal dew point temperature and the air conditioner 14 is in the operating state.

As described above, the 2 nd operation mode control unit 132 operates the air conditioner 14 so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature in a state where the side window 121 and the louver 171 are closed during the period from the start time of the dew condensation prevention process to the end time of the dew condensation prevention process.

The 3 rd operation mode control unit 133 stops the air conditioner 14 in a state where the side window 121 and the louver 171 are opened. When the 2 nd operation mode control unit 132 determines that the current time is the condensation prevention processing end time, the 3 rd operation mode control unit 133 outputs a control signal for opening the side window 121 to the side window driving device 12 and outputs a control signal for opening the sunroof 171 to the sunroof driving device 17. When the air conditioner 14 is in the operating state, the 3 rd operation mode control unit 133 outputs a control signal for changing the air conditioner 14 to the operating state (to be in the stopped state) to the air conditioner 14. Further, the 3 rd operation mode control unit 133 does not output a control signal to the air conditioner 14 when the air conditioner 14 is in the stopped state.

The 3 rd operation mode control unit 133 opens the side windows 121 and the sunroof 171 step by step at predetermined time intervals. First, the 3 rd operation mode control unit 133 opens the side windows 121 and the louver 171 by, for example, 30%. Then, after a predetermined time has elapsed from the time when side window 121 and louver 171 are opened, 3 rd operation mode control unit 133 may open side window 121 and louver 171 by 100%.

Next, a temperature control process of the temperature control device 1 according to embodiment 1 of the present invention will be described.

Fig. 3 is a flowchart for explaining a temperature control process of the temperature control device 1 according to embodiment 1 of the present invention.

First, in step S1, the 1 st operation mode control unit 131 determines whether or not the current time is the night cooling start time. Here, if it is determined that the current time is not the night cooling start time (no in step S1), the determination process in step S1 is repeated until the current time reaches the night cooling start time.

On the other hand, if it is determined that the current time is the night cooling start time (yes in step S1), the 1 st operation mode control unit 131 determines whether the side windows 121 and the louvers 171 are in the closed state. The 1 st operation mode control unit 131 may acquire which of the open state and the closed state of the side window 121 and the louver 171 is from the side window driving device 12 and the louver driving device 17. Furthermore, 1 st operation mode control unit 131 may determine whether side window 121 and louver 171 are in the closed state based on the detection results of the sensors provided in side window 121 and louver 171.

Here, if it is determined that side window 121 and sunroof 171 are in the closed state (yes in step S2), the process proceeds to step S4.

On the other hand, if it is determined that side window 121 and louver 171 are not in the closed state (no in step S2), in step S3, first operation mode control unit 131 outputs a control signal for closing side window 121 to side window driving device 12 and a control signal for closing louver 171 to louver driving device 17. The side window driving device 12 closes the side window 121 if it receives a control signal from the 1 st operation mode control unit 131. Further, the sunroof driving device 17 closes the sunroof 171 if receiving a control signal from the 1 st operation mode control unit 131.

Next, in step S4, the 1 st operation mode control unit 131 determines whether or not the current time is the dew condensation prevention processing start time. Here, if it is determined that the current time is not the dew condensation prevention processing start time (no in step S4), the internal temperature/humidity acquisition unit 111 acquires the internal temperature from the internal temperature/humidity measurement device 11 in step S5.

Next, in step S6, the 1 st operation mode control unit 131 determines whether or not the internal temperature is higher than a predetermined target temperature.

If it is determined that the internal temperature is higher than the predetermined target temperature (yes in step S6), in step S7, the 1 st operation mode control unit 131 determines whether or not the air-conditioning equipment 14 is in a stopped state. Here, if it is determined that the air conditioner 14 is not in the stopped state, that is, if it is determined that the air conditioner 14 is in the operating state (no in step S7), the process proceeds to step S4.

On the other hand, if it is determined that the air conditioner 14 is in the stopped state (yes in step S7), in step S8, the 1 st operation mode control unit 131 outputs a control signal for changing the air conditioner 14 to the operating state to the air conditioner 14. If the air conditioner 14 receives the control signal, it changes to the operating state. Then, the air conditioner 14 performs a cooling operation so that the internal temperature becomes equal to or lower than a predetermined target temperature.

If it is determined in step S6 that the internal temperature is equal to or lower than the predetermined target temperature (no in step S6), in step S9, the 1 st operation mode control unit 131 determines whether the air conditioner 14 is in an operating state. Here, if it is determined that the air conditioner 14 is not in the operating state, that is, if it is determined that the air conditioner 14 is in the stopped state (no in step S9), the process proceeds to step S4.

On the other hand, if it is determined that the air conditioner 14 is in the operating state (yes in step S9), in step S10, the 1 st operation mode control unit 131 outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14. The air conditioner 14 is changed to the stopped state if it receives a control signal from the 1 st operation mode control unit 131. Then, the air conditioner 14 stops the cooling operation.

In steps S5 to S10, the target temperature control process of operating the air conditioner 14 so that the internal temperature reaches the predetermined target temperature in a state where the side window 121 and the louver 171 are closed corresponds to the process of the 1 st operation mode.

If it is determined in step S4 that the current time is the dew condensation prevention processing start time (yes in step S4), in step S11, the 2 nd operation mode control unit 132 performs dew condensation prevention processing for preventing dew condensation from occurring on the fruit. In addition, the dew condensation prevention process corresponds to the process of the 2 nd operation mode.

Here, the dew condensation prevention processing in step S11 will be described.

First, in step S21, the 2 nd operation mode control unit 132 determines whether or not the current time is the condensation prevention processing end time. Here, if it is determined that the current time is the condensation prevention processing end time (yes in step S21), the process proceeds to step S12 in fig. 3.

On the other hand, if it is determined that the current time is not the condensation prevention processing end time (no in step S21), the fruit surface temperature acquisition unit 112 acquires the fruit surface temperature from the surface temperature measurement device 15 in step S22.

Next, in step S23, the internal temperature/humidity acquisition unit 111 acquires the internal temperature and the internal humidity from the internal temperature/humidity measurement device 11.

Next, in step S24, the 2 nd operation mode control unit 132 calculates the internal dew point temperature of the cultivation facility 100 based on the internal temperature and the internal humidity acquired by the internal temperature/humidity acquisition unit 111.

Next, in step S25, the 2 nd operation mode control part 132 determines whether the fruit surface temperature is higher than the internal dew point temperature + α. α is a temperature margin for preventing dew condensation, and is, for example, 0.5 ℃. If it is determined that the fruit surface temperature is higher than the internal dew point temperature + α (yes in step S25), the 2 nd operation mode control unit 132 determines whether the air conditioner 14 is in an operating state in step S26.

Here, if it is determined that the air conditioner 14 is not in the operating state, that is, if it is determined that the air conditioner 14 is in the stopped state (no in step S26), the process proceeds to step S21.

On the other hand, if it is determined that the air conditioner 14 is in the operating state (yes in step S26), in step S27, the 2 nd operation mode control unit 132 outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14. If the control signal is acquired, the air conditioner 14 changes to the stopped state. Then, the air conditioner 14 stops the cooling operation.

If it is determined in step S25 that the fruit surface temperature is equal to or lower than the internal dew point temperature + α (no in step S25), the 2 nd operation mode control unit 132 determines in step S28 whether or not the air conditioner 14 is in a stopped state. Here, if it is determined that the air conditioner 14 is not in the stopped state, that is, if it is determined that the air conditioner 14 is in the operating state (no in step S28), the process proceeds to step S21.

Further, when it is determined in step S28 that the air conditioner 14 is not in the stopped state, the 2 nd operation mode control unit 132 may perform an error process. In the error process, the 2 nd operation mode control part 132 may notify the user that the fruit surface temperature is not higher than the internal dew point temperature although the air conditioner 14 is in the operating state and the cooling operation is being performed.

On the other hand, when determining that the air conditioner 14 is in the stopped state (yes in step S28), in step S29, the 2 nd operation mode control unit 132 outputs a control signal for changing the air conditioner 14 to the operating state to the air conditioner 14. If the air conditioner 14 receives the control signal, it changes to the operating state. Then, the air conditioner 14 performs a cooling operation. If the air conditioner 14 is in an operating state and cooling operation is performed, the internal humidity of the cultivation facility 100 decreases. As a result, the fruit surface temperature is higher than the internal dew point temperature.

Further, in step S25, the 2 nd operation mode control unit 132 determines whether or not the fruit surface temperature is higher than the internal dew point temperature + α, but the present invention is not particularly limited thereto, and the 2 nd operation mode control unit 132 may compare the fruit surface temperature with a value obtained by adding the error temperature and the temperature margin α to the internal dew point temperature. The error temperature is, for example, 2 ℃.

Returning to fig. 3, next, in step S12, 3 rd operation mode control unit 133 performs a windowing process for opening side window 121 and louver 171. In addition, the windowing process corresponds to the process of the 3 rd operation mode.

Here, the windowing process in step S12 will be described.

First, in step S41, the 3 rd operation mode control unit 133 determines whether the air conditioner 14 is in an operating state. Here, if it is determined that the air conditioner 14 is not in the operating state, that is, if it is determined that the air conditioner 14 is in the stopped state (no in step S41), the process proceeds to step S43.

On the other hand, when determining that the air conditioner 14 is in the operating state (yes in step S41), in step S42, the 3 rd operation mode control unit 133 outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14. The air conditioner 14 changes to the stopped state if it receives the control signal from the 3 rd operation mode control unit 133. Then, the air conditioner 14 stops the cooling operation.

Next, in step S43, the 3 rd operation mode control unit 133 outputs a control signal for opening 30% of the side windows 121 and the louvers 171 to the side window driving device 12 and the louver driving device 17. The side window driving device 12 opens the side window 121 by 30% in accordance with the control signal from the 3 rd operation mode control unit 133. Further, the sunroof driving device 17 opens the sunroof 171 by 30% in accordance with a control signal from the 3 rd operation mode control unit 133. Further, the 3 rd operation mode control unit 133 stores the timing of opening the side window 121 and the louver 171 in the memory 102.

Next, in step S44, the 3 rd operation mode control unit 133 determines whether or not a predetermined time has elapsed from the time when the side window 121 and the louver 171 are opened. The prescribed time is, for example, 30 minutes. Here, if it is determined that the predetermined time has not elapsed from the time when side window 121 and louver 171 are opened (no in step S44), the determination process in step S44 is performed until the predetermined time has elapsed from the time when side window 121 and louver 171 are opened.

On the other hand, if it is determined that the predetermined time has elapsed from the time when side window 121 and louver 171 are opened (yes in step S44), in step S45, third operating mode control unit 133 outputs a control signal for opening side window 121 and louver 171 by 100% to side window drive device 12 and louver drive device 17. The side window driving device 12 opens the side window 121 by 100% in accordance with the control signal from the 3 rd operation mode control unit 133. Further, the sunroof driving device 17 opens the sunroof 171 by 100% in accordance with a control signal from the 3 rd operation mode control unit 133.

Then, after the windowing process in step S12 in fig. 3, the temperature control process is ended.

After sunrise, sunlight enters the cultivation facility 100, and the internal temperature of the cultivation facility 100 rises. The temperature of the fruit rises following the internal temperature of the cultivation facility 100. Then, after a predetermined time has elapsed from the sunrise time, the air conditioner 14 is stopped, the ventilation fan 13 is operated, and the side windows 121 and the louver 171 are opened. At this time, since the air conditioner 14 is also operated after sunrise, the internal humidity is suppressed to be low, and the internal dew point temperature is also lowered.

As described above, at night, the air conditioner 14 is operated so that the internal temperature of the cultivation facility 100 reaches a predetermined target temperature in a state where the side windows 121 and the sunroof 171 are closed. From before sunrise to after sunrise, the air conditioner 14 is operated in such a manner that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature of the cultivation facility 100 in a state where the side windows 121 and the skylight 171 are closed. Then, if the internal temperature of cultivation facility 100 approaches the external temperature of cultivation facility 100, air conditioning equipment 14 is stopped with side window 121 and louver 171 opened. Therefore, when the sunrise rear side window 121 and the louver 171 are opened, the internal temperature of the cultivation facility 100 approaches the external temperature of the cultivation facility 100, and the surface temperature of the fruit 10 is higher than the internal dew point temperature of the cultivation facility 100, so that dew condensation on the surface of the fruit 10 can be reliably prevented.

In embodiment 1, although side window 121 and louver 171 are initially opened by 30%, the present invention is not particularly limited thereto. The ratio at which side window 121 and louver 171 are initially opened by 50% may be set to be no particular limitation.

In embodiment 1, the 3 rd operation mode control unit 133 opens the side windows 121 and the louvers 171 in 2 stages, but the present invention is not particularly limited thereto, and the side windows 121 and the louvers 171 may be opened in 3 or more stages.

In the case where the cultivation system does not include the side window driving device 12 and the user manually opens the side window 121, the 3 rd operation mode control unit 133 may display a screen instructing to open the side window 121 by 30% on a display device connected to the temperature control device 1 or a terminal device owned by the user. After a predetermined time has elapsed from the time when the side window 121 is opened, the 3 rd operation mode control unit 133 may display a screen instructing to open 100% of the side window 121 on the display device or the terminal device.

Similarly, in the case where the cultivation system does not include the louver driving device 17 and the user manually opens the louver 171, the 3 rd operation mode control unit 133 may display a screen instructing to open 30% of the louver 171 on a display device connected to the temperature control device 1 or a terminal device owned by the user. After a predetermined time has elapsed from the time when sunroof 171 is opened, 3 rd operation mode control unit 133 may display a screen instructing sunroof 171 to be opened by 100% on the display device or the terminal device.

Next, a 1 st modification of embodiment 1 will be described. While in embodiment 1 described above, the 3 rd operation mode control unit 133 gradually opens the side window 121 and the louver 171 in the window opening process, in variation 1 of embodiment 1, the 3 rd operation mode control unit 133 does not gradually open the side window 121 and the louver 171 but opens the side window 121 and the louver 171 100% at a time in the window opening process.

The processing of steps S51 and S52 is the same as the processing of steps S41 and S42 shown in fig. 5, and therefore, the description thereof is omitted.

Next, in step S53, the 3 rd operation mode control unit 133 outputs a control signal for fully opening the side window 121 and the sunroof 171 to the side window driving device 12 (the side window driving device 12 and the sunroof driving device 17, respectively). The side window driving device 12 opens the side window 121 fully in accordance with a control signal from the 3 rd operation mode control unit 133. Further, the sunroof driving device 17 opens the sunroof 171 to the full position in accordance with a control signal from the 3 rd operation mode control unit 133.

In addition, when the user manually opens the side window 121 without providing the side window driving device 12 in the cultivation system, the 3 rd operation mode control unit 133 may display a screen instructing to fully open the side window 121 on a display device connected to the temperature control device 1 or a terminal device owned by the user.

Similarly, when the user manually opens louver 171 without providing louver drive device 17 in the cultivation system, 3 rd operation mode control unit 133 may display a screen instructing to fully open louver 171 on a display device connected to temperature control device 1 or a terminal device owned by the user.

Next, a 2 nd modification of embodiment 1 will be described. In the above-described embodiment 1, in the step S21 of the condensation prevention process, the 2 nd operation mode control unit 132 determines whether or not the current time is the condensation prevention process completion time, but in the 2 nd modification of the embodiment 1, the 2 nd operation mode control unit 132 determines whether or not the internal temperature has reached the growth limit temperature that becomes the growth limit of the fruit in the condensation prevention process.

That is, in embodiment 1 described above, the temperature control by the air conditioner 14 is also performed after sunrise. However, after sunrise, the temperature inside the cultivation facility 100 rises due to the irradiation of sunlight even if the temperature control by the air conditioner 14d is performed. In contrast, the 2 nd operation mode control unit 132 may shift from the 2 nd operation mode to the 3 rd operation mode when the internal temperature reaches the growth limit temperature at which the fruit grows. The growth limiting temperature is a temperature at which the fruit to be cultivated has a growth limit, and is, for example, 30 ℃.

First, in step S71, the internal temperature/humidity acquisition unit 111 acquires the internal temperature from the internal temperature/humidity measurement device 11.

Next, in step S72, the 2 nd operation mode control unit 132 determines whether or not the internal temperature has reached a growth limit temperature that is the growth limit of the fruit. Here, when it is determined that the internal temperature has reached the growth limit temperature (yes at step S72), the process proceeds to step S12 of fig. 3.

On the other hand, when determining that the internal temperature has not reached the growth limit temperature (no in step S72), the fruit surface temperature obtaining part 112 obtains the fruit surface temperature from the surface temperature measuring device 15 in step S73.

The processing of steps S73 to S80 is the same as the processing of steps S22 to S29 shown in fig. 4, and therefore, the description thereof is omitted.

(embodiment mode 2)

In embodiment 1 described above, the 2 nd operation mode control unit 132 shifts from the 2 nd operation mode to the 3 rd operation mode when the current time is the condensation prevention processing end time, but in embodiment 2, the 2 nd operation mode control unit calculates the outside dew point temperature of the cultivation facility 100 based on the outside temperature and the outside humidity of the cultivation facility 100, and shifts from the 2 nd operation mode to the 3 rd operation mode when the surface temperature of the fruit is higher than the outside dew point temperature.

The cultivation system shown in fig. 8 includes a temperature control device 1A, an internal temperature/humidity measurement device 11, a side window drive device 12, a ventilation fan 13, an air conditioning unit 14, a surface temperature measurement device 15, a louver drive device 17, a side window 121, a louver 171, and an external temperature/humidity measurement device 16. In embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

The external temperature/humidity measuring device 16 measures the external temperature and the external humidity of the cultivation facility 100. The external temperature/humidity measurement device 16 includes a temperature sensor 161 and a humidity sensor 162. The temperature sensor 161 measures the outside temperature of the cultivation facility 100. The humidity sensor 162 measures the outside humidity of the cultivation facility 100. The external humidity is the relative humidity outside the cultivation facility 100. The temperature sensor 161 and the humidity sensor 162 are provided at any place outside the cultivation facility 100.

The temperature control device 1A shown in fig. 9 includes a processor 101A and a memory 102.

The processor 101A is, for example, a CPU, and includes an internal temperature/humidity acquisition unit 111, a fruit surface temperature acquisition unit 112, a temperature control unit 113A, and an external temperature/humidity acquisition unit 114.

The external temperature/humidity acquisition unit 114 acquires the external temperature and the external humidity of the cultivation facility 100 measured by the external temperature/humidity measurement device 16. The external temperature/humidity acquisition unit 114 periodically acquires the external temperature and the external humidity from the external temperature/humidity measurement device 16 at predetermined time intervals.

The temperature control section 113A includes a 1 st operation mode control section 131, a 2 nd operation mode control section 132A, and a 3 rd operation mode control section 133.

The 2 nd operation mode control unit 132A calculates the outside dew point temperature of the cultivation facility 100 based on the outside temperature and the outside humidity. When the surface temperature of the fruit is higher than the external dew point temperature, the 2 nd operation mode control unit 132A shifts from the 2 nd operation mode to the 3 rd operation mode.

The 2 nd operation mode control portion 132A calculates the outside dew point temperature based on the following expression (3).

External dew point temperature =237.3 log (external water vapor pressure/6.11)/(7.5 log (10) + log (6.11/external water vapor pressure)) (3)

The external steam pressure is calculated based on the following formula (4).

External water vapor pressure =6.11 x 10^ (7.5 x external temperature/(273.3 + external temperature)) xexternal humidity/100 (4)

The 2 nd operation mode control unit 132A operates the air conditioning equipment 14 so that the surface temperature of the fruit 10 becomes higher than the internal dew point temperature in a state where the side window 121 and the louver 171 are closed when the fruit surface temperature is equal to or lower than the external dew point temperature. When the fruit surface temperature is higher than the outside dew point temperature, the 2 nd operation mode control unit 132A shifts the dew condensation prevention process by the 2 nd operation mode control unit 132A to the windowing process by the 3 rd operation mode control unit 133.

The other functions of the 2 nd operation mode control unit 132A are the same as those of the 2 nd operation mode control unit 132 of embodiment 1.

Next, a temperature control process of the temperature control device 1A according to embodiment 2 of the present invention will be described. The temperature control process of the temperature control device 1A according to embodiment 2 is different from the temperature control process of the temperature control device 1 according to embodiment 1 only in the dew condensation prevention process. Therefore, in the following description, only the condensation prevention process of embodiment 2 will be described.

First, in step S91, the fruit surface temperature acquisition unit 112 acquires the fruit surface temperature from the surface temperature measurement device 15.

Next, in step S92, the external temperature/humidity acquisition unit 114 acquires the external temperature and the external humidity from the external temperature/humidity measurement device 16.

Next, in step S93, the 2 nd operation mode control unit 132A calculates the outside dew point temperature of the cultivation facility 100 based on the outside temperature and the outside humidity acquired by the outside temperature/humidity acquisition unit 114.

Next, in step S94, the 2 nd operation mode control part 132A determines whether the fruit surface temperature is higher than the external dew point temperature. Here, if it is determined that the fruit surface temperature is higher than the external dew point temperature (yes in step S94), the process proceeds to step S12 in fig. 3.

On the other hand, when determining that the fruit surface temperature is equal to or lower than the external dew point temperature (no in step S94), the fruit surface temperature obtaining unit 112 obtains the fruit surface temperature from the surface temperature measuring device 15 in step S95.

The processing of steps S95 to S102 is the same as the processing of steps S22 to S29 shown in fig. 4, and therefore, the description thereof is omitted.

Next, in step S98, the 2 nd operation mode control unit 132A may determine whether or not the fruit surface temperature acquired in step S91 is higher than the internal dew point temperature + α. In this case, in step S95, the fruit surface temperature obtaining unit 112 may not obtain the fruit surface temperature from the surface temperature measuring device 15.

Further, in step S94, the 2 nd operation mode control unit 132A determines whether or not the fruit surface temperature is higher than the outside dew point temperature, but the present invention is not particularly limited thereto, and the 2 nd operation mode control unit 132A may compare the fruit surface temperature with a value obtained by adding the error temperature to the outside dew point temperature. The error temperature is, for example, 2 ℃.

The temperature control device 1A according to embodiment 2 can be applied to the 1 st modification and the 2 nd modification of embodiment 1 described above.

(embodiment mode 3)

In the above-described embodiment 1, the cultivation system includes the surface temperature measuring device 15, and the fruit surface temperature acquiring unit 112 acquires the fruit surface temperature measured by the surface temperature measuring device 15, but in the present embodiment 3, the cultivation system does not include the surface temperature measuring device 15, and the temperature control device 1B estimates the fruit surface temperature.

Fig. 11 is an overall diagram showing a configuration of a cultivation system according to embodiment 3 of the present invention, and fig. 12 is a block diagram showing a configuration of a temperature control device according to embodiment 3 of the present invention.

The cultivation system shown in fig. 11 includes a temperature control device 1B, an internal temperature/humidity measurement device 11, a side window drive device 12, a ventilation fan 13, an air conditioning unit 14, a sunroof drive device 17, a side window 121, and a sunroof 171. In embodiment 3, the same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

The cultivation system according to embodiment 3 is different from the cultivation system according to embodiment 1 in that the surface temperature measuring device 15 is not provided.

The temperature control device 1B shown in fig. 12 includes a processor 101B and a memory 102B.

The processor 101B is, for example, a CPU, and includes an internal temperature/humidity acquisition unit 111, a temperature control unit 113B, and a fruit surface temperature estimation unit 115.

The memory 102B stores a surface temperature estimation table in which an estimated value of the surface temperature of the fruit is associated with the internal temperature of the cultivation facility 100 at the time of transition to the condensation prevention process (the 2 nd operation mode) and the elapsed time from the time of transition to the condensation prevention process (the 2 nd operation mode).

The surface temperature estimation table associates the estimated value of the fruit surface temperature with the internal temperature of the cultivation facility 100 at the dew condensation prevention processing transition time and the elapsed time from the dew condensation prevention processing transition time.

In fig. 13, the upper row indicates the internal temperature of the cultivation facility 100 at the dew condensation prevention processing transition time, and the left column indicates the elapsed time from the dew condensation prevention processing transition time. For example, when the internal temperature of the cultivation facility 100 at the dew condensation prevention treatment transition time is 18 ℃ and the elapsed time from the dew condensation prevention treatment transition time is 1 hour, the estimated value of the fruit surface temperature is 20 ℃.

The memory 102B stores the internal temperature of the cultivation facility 100 at the time of transition to the dew condensation prevention process (the 2 nd operation mode).

The fruit surface temperature estimating unit 115 estimates the surface temperature of the fruit. The fruit surface temperature estimating unit 115 extracts estimated values corresponding to the internal temperature at the time of transition to the condensation prevention process (the 2 nd operation mode) and the elapsed time from the time of transition to the condensation prevention process (the 2 nd operation mode) from the surface temperature estimation table stored in the memory 102B.

The temperature control section 113B includes a 1 st operation mode control section 131, a 2 nd operation mode control section 132B, and a 3 rd operation mode control section 133.

When the side window 121 and the louver 171 are closed, the 2 nd operation mode control unit 132B operates the air conditioning equipment 14 such that the estimated value of the surface temperature of the fruit 10 becomes higher than the internal dew point temperature. That is, the 2 nd operation mode control unit 132B outputs a control signal for changing the air conditioner 14 to the stopped state to the air conditioner 14 when the estimated value of the fruit surface temperature estimated by the fruit surface temperature estimation unit 115 is higher than the internal dew point temperature and the air conditioner 14 is in the operating state. When the estimated value of the fruit surface temperature is higher than the internal dew point temperature and the air conditioner 14 is in the stopped state, the 2 nd operation mode control unit 132B does not output the control signal to the air conditioner 14. Further, the 2 nd operation mode control unit 132B outputs a control signal for changing the air conditioner 14 to the operating state to the air conditioner 14 when the estimated value of the fruit surface temperature is equal to or lower than the internal dew point temperature and the air conditioner 14 is in the stopped state. Further, the 2 nd operation mode control unit 132B does not output a control signal to the air conditioner 14 when the estimated value of the fruit surface temperature is equal to or lower than the internal dew point temperature and the air conditioner 14 is in the operating state.

The other functions of the 2 nd operation mode control unit 132B are the same as those of the 2 nd operation mode control unit 132 of embodiment 1.

Next, a temperature control process of the temperature control device 1B according to embodiment 3 of the present invention will be described. The temperature control process of the temperature control device 1B according to embodiment 3 is different from the temperature control process of the temperature control device 1 according to embodiment 1 only in the condensation prevention process. Therefore, in the following description, only the condensation prevention process of embodiment 3 will be described.

First, in step S111, the internal temperature/humidity acquisition unit 111 acquires the internal temperature from the internal temperature/humidity measurement device 11.

Next, in step S112, the internal temperature/humidity acquisition unit 111 stores the acquired internal temperature in the memory 102B as the internal temperature at the time of transition of the dew condensation prevention process.

Next, in step S113, the 2 nd operation mode control unit 132B determines whether or not the current time is the condensation prevention processing completion time. Here, if it is determined that the current time is the condensation prevention processing end time (yes at step S113), the process proceeds to step S12 in fig. 3.

On the other hand, if it is determined that the current time is not the condensation prevention processing end time (no in step S113), the fruit surface temperature estimation unit 115 estimates the fruit surface temperature in step S114. The fruit surface temperature estimating unit 115 extracts estimated values of the fruit surface temperature corresponding to the internal temperature at the time of the dew condensation prevention process transition and the elapsed time from the time of the dew condensation prevention process transition from the surface temperature estimation table stored in the memory 102B.

The processing in steps S115 and S116 is the same as the processing in steps S23 and S24 shown in fig. 4, and therefore, the description thereof is omitted.

Next, in step S117, the 2 nd operation mode control unit 132B determines whether or not the estimated value of the fruit surface temperature is higher than the internal dew point temperature + α. α is a temperature margin for preventing dew condensation, and is, for example, 0.5 ℃. If it is determined that the estimated value of the fruit surface temperature is higher than the internal dew point temperature + α (yes in step S117), the 2 nd operation mode control unit 132B determines whether the air conditioner 14 is in an operating state in step S118.

The processing of steps S118 and S119 is the same as the processing of steps S26 and S27 shown in fig. 4, and therefore, the description thereof is omitted.

If it is determined in step S117 that the estimated value of the fruit surface temperature is equal to or lower than the internal dew point temperature + α (no in step S117), the 2 nd operation mode control unit 132B determines in step S120 whether or not the air conditioner 14 is in a stopped state.

The processing in steps S120 and S121 is the same as the processing in steps S28 and S29 shown in fig. 4, and therefore, the description thereof is omitted.

If it is determined in step S120 that the air conditioner 14 is not in the stopped state, the 2 nd operation mode control unit 132B may perform an error process. In the error process, the 2 nd operation mode control part 132B may notify the user that the fruit surface temperature is not higher than the internal dew point temperature although the air conditioner 14 is in the operating state and the cooling operation is being performed.

In step S117, the 2 nd operation mode control unit 132B determines whether or not the estimated value of the fruit surface temperature is higher than the internal dew point temperature + α, but the present invention is not particularly limited thereto, and the 2 nd operation mode control unit 132B may compare the estimated value of the fruit surface temperature with a value obtained by adding the error temperature and the temperature margin α to the internal dew point temperature. The error temperature is, for example, 2 ℃.

The temperature control device 1B according to embodiment 3 can be applied to the 1 st modification and the 2 nd modification of embodiment 1 described above. The cultivation system according to embodiment 3 can be applied to embodiment 2 described above.

In the above-described embodiments 1 to 3, the temperature control method for preventing condensation on the fruit surface has been described, and this method focuses on the case where the cooling in the nighttime is switched to the introduction of outside air in the daytime in a hot and humid area.

However, even in a case where the temperature and humidity near the fruit change during cultivation in an area other than a hot and humid area, the temperature control devices according to embodiments 1 to 3 can prevent condensation from occurring on the surface of the fruit by performing temperature control so that the surface temperature of the fruit becomes higher than the internal dew point temperature of the cultivation facility 100.

In embodiments 1 to 3, the cultivation system includes side window 121 and louver 171, but the present invention is not particularly limited thereto, and may include only one of side window 121 and louver 171.

In the above embodiments, each component may be configured by dedicated hardware, or may be realized by executing a software program suitable for each component. Each component can be realized by reading a software program stored in a recording medium such as a hard disk or a semiconductor memory by a program execution unit such as a CPU or a processor and executing the program.

A part or all of the functions of the apparatus according to the embodiment of the present invention are typically realized as an LSI (Large Scale Integration) which is an integrated circuit. These functions may be integrated into 1 chip individually or may be integrated into 1 chip in such a manner that a part or all of the functions are included. The integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. A Field Programmable Gate Array (FPGA) after LSI manufacturing or a reconfigurable processor that can reconfigure connection and setting of circuit elements inside LSI may be used.

In addition, a part or all of the functions of the apparatus according to the embodiment of the present invention may be realized by executing a program by a processor such as a CPU.

Note that all the numbers used above are numbers exemplified for specifically describing the present invention, and the present invention is not limited to the exemplified numbers.

The order in which the steps shown in the flowcharts are executed is an order exemplified for specifically explaining the present invention, and an order other than the above may be adopted within a range in which the same effect is obtained. Further, a part of the steps may be executed simultaneously (in parallel) with other steps.

Industrial applicability

The technique according to the present invention can reliably prevent dew condensation on the surface of the fruit, and therefore is useful as a technique for controlling the internal temperature of a facility in which the fruit is cultivated.

Claims

1. A temperature control method for a temperature control device for controlling the internal temperature of a fruit cultivation facility, comprising the steps of:

acquiring the internal temperature and the internal humidity of the cultivation facility; and the number of the first and second groups,

controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein,

the 1 st operation mode is to operate the air conditioner so that the internal temperature reaches a predetermined target temperature in a state where an openable and closable window that can separate the inside of the cultivation facility from the outside is closed,

the 2 nd operation mode of calculating an internal dew point temperature of the cultivation facility based on the internal temperature and the internal humidity, operating the air conditioning equipment in a state where the window is closed so that the surface temperature of the fruit is higher than the internal dew point temperature,

the 3 rd operation mode stops the air conditioner in a state where the window is opened.

2. The temperature control method according to claim 1,

after a predetermined time has elapsed from the sunrise time, the mode shifts from the 2 nd operation mode to the 3 rd operation mode.

3. The temperature control method according to claim 1,

in the case where the internal temperature reaches a temperature at which the growth of the fruit is at a limit, the 2 nd operation mode is shifted to the 3 rd operation mode.

4. The temperature control method according to claim 1,

also acquiring the external temperature and external humidity of the cultivation facility;

calculating an external dew point temperature of the cultivation facility based on the external temperature and the external humidity, and in case the surface temperature of the fruit is higher than the external dew point temperature, shifting from the 2 nd operation mode to the 3 rd operation mode.

5. The temperature control method according to any one of claims 1 to 4,

in the 2 nd mode of operation, the surface temperature of the fruit is also obtained from a sensor that measures the surface temperature of the fruit.

6. The temperature control method according to any one of claims 1 to 4,

in the 2 nd mode of operation, the surface temperature of the fruit is also presumed.

7. The temperature control method according to claim 6,

the estimated values are extracted from a table in which the internal temperature of the cultivation facility at the time of transition to the 2 nd operation mode, the elapsed time from the time of transition to the 2 nd operation mode, and the estimated value of the surface temperature of the fruit are associated with each other, and the estimated values are associated with the internal temperature at the time of transition to the 2 nd operation mode and the elapsed time from the time of transition to the 2 nd operation mode.

8. The temperature control method according to any one of claims 1 to 7,

in the 3 rd mode of operation, the window is opened stepwise at regular time intervals.

9. A temperature control device for controlling the internal temperature of a facility for cultivating fruit, comprising:

an acquisition unit that acquires an internal temperature and an internal humidity of the cultivation facility; and the number of the first and second groups,

a control unit for controlling the internal temperature of the cultivation facility by sequentially switching a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode,

the 1 st operation mode is a mode in which the air conditioning equipment is operated so that the internal temperature reaches a predetermined target temperature in a state in which an openable and closable window that can separate the inside of the cultivation facility from the outside is closed,

the 2 nd operation mode of calculating an inside dew point temperature of the cultivation facility based on the inside temperature and the inside humidity, operating the air conditioning equipment in a state where the window is closed such that a surface temperature of the fruit is higher than the inside dew point temperature,

10. A temperature control program for controlling an internal temperature of a fruit cultivation plant, the temperature control program causing a computer to function as:

11. A temperature control system, comprising:

a temperature control device for controlling the internal temperature of the fruit cultivation facility;

an air conditioning device; and (c) a second step of,

an openable and closable window which can separate the inside from the outside of the cultivation facility, wherein,

the temperature control device includes:

the 1 st operation mode of operating the air conditioner so that the internal temperature reaches a predetermined target temperature in a state where the window is closed,

12. A temperature control method for a temperature control device for controlling the internal temperature of a facility for cultivating fruit, comprising the steps of:

acquiring a surface temperature of the fruit from a sensor measuring the surface temperature of the fruit; and (c) a second step of,

the 3 rd operation mode is to stop the air conditioner in a state where the window is opened.

13. A temperature control device for controlling the internal temperature of a fruit cultivation facility, comprising:

an acquisition unit that acquires the surface temperature of the fruit from a sensor that measures the surface temperature of the fruit; and (c) a second step of,

14. A temperature control program for controlling the internal temperature of a facility for cultivating fruit, characterized by causing a computer to function as:

15. A temperature control system, comprising:

an air conditioning device;

an openable and closable window that can separate the inside from the outside of the cultivation facility; and (c) a second step of,

a sensor that measures a surface temperature of the fruit, wherein,

the temperature control device includes:

an acquisition unit that acquires the surface temperature of the fruit from the sensor; and the number of the first and second groups,