CN115334874B

CN115334874B - Temperature control method, temperature control device, temperature control program, and temperature control system

Info

Publication number: CN115334874B
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: 2024-02-09
Anticipated expiration: 2041-03-17
Also published as: CN115334874A; WO2021205833A1; 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), controls the internal temperature of the cultivation facility (100) by sequentially switching between 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 conditioner (14) to operate so that the internal temperature reaches a predetermined target temperature in a state where an openable side window (121) and a sunroof (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) based on the internal temperature and the internal humidity, causes the air conditioner (14) to operate so that the surface temperature of fruits is higher than the internal dew point temperature in a state where the side window (121) and the sunroof (171) are opened, and the 3 rd operation mode causes the air conditioner (14) to stop.

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, in recent years, facility cultivation using a steel frame greenhouse, a pipe greenhouse, or the like (hereinafter, simply referred to as "greenhouse") has been widely used.

By isolating the interior of the greenhouse in which vegetables are planted from the outside, the facility cultivation can realize different environmental conditions from the outside in the greenhouse. Accordingly, the influence of climate or weather conditions is suppressed to be small, vegetables can be planted for a long period of time or year, and stable vegetable supply can be realized. Further, since vegetables can be planted and produced even in a region where it has been difficult to plant vegetables in the past, local production and local consumption can be achieved and food mileage can be reduced, attention has been paid to SDGs (sustainable development objective).

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

However, in subtropical regions, for example, there is little difference between cold and warm day and night. Therefore, the difference between the cold and warm of the day and the night can be considered by cooling the room with the cooling device at night.

Here, since the greenhouse is cooled by the cooling device at night, it is necessary to close an openable window provided in the greenhouse. However, if the windows of the greenhouse are closed during the daytime, the temperature in the greenhouse becomes too high, so that the windows need to be opened during the daytime.

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. Also, when the cooled fruits come into contact with high-temperature and high-humidity air from the outside, dew condensation may occur on the surfaces of the fruits. Dew condensation on the surface of fruits is known to be one of the causes of fruit dehiscence and also to be 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 cherry heating facility during the daytime to a value not higher than a value in which moisture can be evaporated from a tree body containing cherry fruits and that does not cause condensation of cherry fruits by adjusting the temperature in the cherry heating facility.

However, in the above-described conventional technique, the temperature and humidity in the facility are adjusted to a value not lower than a value at which the cherry fruits do not dew on each other during the daytime by adjusting the temperature in the facility based on the humidity in the facility, but the surface temperature of the fruits is not considered. Therefore, in the above-described conventional technique, it is difficult to reliably prevent dew condensation on the surface of the fruit, and further improvement is required.

Prior art literature

Patent literature

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

Disclosure of Invention

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

The temperature control method according to one aspect of the present invention is a temperature control method of a temperature control device for controlling an internal temperature of a fruit cultivation facility, comprising 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 separates 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, dew condensation on the surface of the fruit can be reliably prevented.

Drawings

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

Fig. 2 is a block diagram showing the structure 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 processing at step S11 in fig. 3.

Fig. 5 is a flowchart for explaining the windowing process of 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 dew condensation prevention processing according to modification 2 of embodiment 1 of the present invention.

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

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

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

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

Fig. 12 is a block diagram showing the structure 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 according to embodiment 3 of the present invention.

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

Detailed Description

(basic knowledge of the invention)

In the cultivation in facilities, at a high temperature of 30 ℃ or higher, fruit setting, swelling and coloring are poor. In addition, at 35℃or higher, pollen fertilization rate decreases, and fruit drop occurs. In addition, when the temperature at night is high, the consumption due to respiration increases, and the fruit expansion is deteriorated. On the other hand, when the daytime temperature is 20 ℃ or lower and the nighttime temperature is 4 ℃ to 8 ℃, differentiation and development of each organ of the flower are promoted, the number of ovary cells increases, and malformed fruits are often produced.

In addition, the relative humidity may be in a suitable range, and for example, if the relative humidity exceeds 90%, diseases such as leaf mold and the like are liable to occur. In addition, dew condensation may occur on the surface of fruits in an environment with extremely high relative humidity. Dew condensation on the surface of the fruit is said to cause cracking of the fruit. The commercial value of the split fruit is reduced and the split fruit cannot be sold in many cases. In addition, dew condensation on the fruit surface is also a cause of disease infection such as leaf mold.

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

In recent years, there have been increasing cases where the control of the temperature and humidity in the greenhouse is automatically performed by a comprehensive environmental control device based on measurement data such as the temperature, humidity, and light amount inside and outside the greenhouse, though the control is sometimes performed manually by vegetable producers. In addition, the heat pump air conditioner and the air conditioning equipment such as the combustion type heating machine have high operation costs. Therefore, in many cases, the use of air conditioning equipment is suppressed to some extent, and control is performed in combination with ventilation, shading, and the like.

In the facility cultivation, the environment in the greenhouse is controlled by controlling environmental control devices such as side windows, skylights, ventilation fans, curtains, air conditioning devices (heat pump air conditioner, combustion type heating machine, etc.), and mist, so that the environment in the greenhouse is suitable for growth of plants (vegetables) to be cultivated, that is, growth of vegetables to be cultivated.

For example, in the case of growing tomatoes, the 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 in the night is 10 to 15 ℃, and environmental control is performed so that the temperature in the greenhouse falls within the above range.

Furthermore, the suitable greenhouse environment is different during the day when photosynthesis takes place and during the night when only breathing takes place. In the case of tomatoes, the daytime temperature is set to 25 to 30 ℃ as a target value, and the nighttime temperature is set to 10 to 15 ℃ as a target value, so that the temperature in the greenhouse is controlled.

Therefore, in the course of a day, when switching from the night temperature control to the daytime temperature control, the temperature in the greenhouse greatly changes. At this time, depending on the temperature and humidity conditions in the greenhouse, the difference between the surface temperature of the fruit and the temperature in the greenhouse may be increased, and as a result, condensation may occur on the surface of the fruit.

Specific examples are shown below.

As the cultivation area, a humid and hot climate area typified by a subtropical area is taken as a precondition. The hot and humid climate area is high in temperature and humidity at night in the daytime. In this region, the greenhouse is cooled at night by using a heat pump air conditioner or the like. On the other hand, after sunrise, the temperature in the solar greenhouse increases, and the heat pump air conditioner cannot sufficiently cool the solar greenhouse. Therefore, the heat pump air conditioner is stopped in the daytime, and the outside air is actively introduced by ventilation. Accordingly, an extreme temperature rise is suppressed.

Here, a case of cultivating tomatoes is considered. The temperature control for cooling the greenhouse by the heat pump air conditioner at night was switched from the temperature control for introducing outside air before and after sunrise, but condensation sometimes occurred in the tomato fruits during the switching.

This is due to the following reason.

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

(2) When switching to the temperature control for introducing outside air, air having a higher temperature and a higher humidity than those in the greenhouse is introduced.

(3) The heat capacity of the tomato fruit is large. Therefore, even if the ambient temperature suddenly increases, the temperature of the tomato fruit slowly increases.

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

In order to solve the above problems, one aspect of the present invention relates to a temperature control method of a temperature control device for controlling an internal temperature of a fruit cultivation facility, comprising 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 separates 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 apparatus is operated so that the internal temperature of the cultivation facility reaches the predetermined target temperature at night when the window is closed. The air conditioner is operated such that the surface temperature of the fruits 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 internal temperature of the cultivation facility approaches the external temperature of the cultivation facility, the air conditioner 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 above-described 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 the sunrise time.

According to this configuration, the air conditioner is operated 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 is stopped in a state where the window is opened after the predetermined time elapses from the sunrise time. Therefore, by setting the predetermined time to a time when the internal temperature of the cultivation facility approaches the external temperature of the cultivation facility, dew condensation on the surface of the fruit can be reliably prevented.

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

According to this configuration, the air conditioner is operated 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 the internal temperature reaches the limit of fruit growth, and is stopped in a state where the window is opened in a state where the internal temperature reaches the limit of fruit growth. 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 or exceeds the external temperature of the cultivation facility, and dew condensation on the surface of the fruit can be prevented even if the window is opened.

In the temperature control method, the external temperature and the external humidity of the cultivation facility may be obtained; calculating an external dew point temperature of the cultivation facility based on the external temperature and the external humidity, and shifting from the 2 nd operation mode to the 3 rd operation mode in case that the surface temperature of the fruit is higher than the external 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 equipment is operated so 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 equipment is stopped 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 thus dew condensation can be prevented from occurring on the surface of the fruit.

In the above-described temperature control method, in the 2 nd operation mode, the surface temperature of the fruit may be obtained from a sensor for measuring the surface temperature of the fruit.

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

In the above-described 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 above-described temperature control method, the estimated value corresponding to 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 may be extracted from a table in which the internal temperature of the cultivation facility at the time of transition to the 2 nd operation mode and the estimated value of the surface temperature of the fruit correspond to each other.

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 above-described temperature control method, the window may be opened stepwise at predetermined time intervals in the 3 rd operation mode.

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

The temperature control device according to an aspect of the present invention is a temperature control device for controlling an internal temperature of a fruit cultivation facility, comprising: 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 between 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 window that separates the interior of the cultivation facility from the exterior 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, and operates the air conditioner so that the 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.

The temperature control program according to an aspect of the present invention is a temperature control program for controlling an internal temperature of a fruit cultivation facility, which causes 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 separates 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 cultivation facility of the fruit; an air conditioning apparatus; and an openable window that separates an inside from an outside of the cultivation facility, wherein the temperature control apparatus 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 between a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates the air conditioning device so 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, operates the air conditioning device so that the 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 conditioning device in a state where the window is opened.

Another aspect of the present invention relates to a temperature control method of a temperature control device for controlling an internal temperature of a cultivation facility for fruits, comprising the steps of: acquiring the surface temperature of the fruit from a sensor that measures 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 separates 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 present invention relates to a temperature control device for controlling an 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 a control unit that controls the internal temperature of the cultivation facility by sequentially switching between 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 window that separates the interior of the cultivation facility from the exterior 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, and operates the air conditioner so that the 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 another aspect of the present invention is a temperature control program for controlling an internal temperature of a fruit cultivation facility, which causes a computer to function as: acquiring the surface temperature of the fruit from a sensor that measures 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 separates 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 cultivation facility of the fruit; an air conditioning apparatus; an openable window that separates the interior of the cultivation facility from the exterior; and a sensor that measures a surface temperature of the fruit, wherein the temperature control device includes: an acquisition unit that acquires a surface temperature of the fruit from the sensor; and a control unit that controls the internal temperature of the cultivation facility by sequentially switching between a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein the 1 st operation mode operates the air conditioning device so 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, operates the air conditioning device so that the 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 conditioning device in a state where the window is opened.

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

(embodiment 1)

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 tunnel greenhouse surrounded by polyolefin, polyvinyl chloride, a 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 apparatus 1, an internal temperature and humidity measuring apparatus 11, a side window driving apparatus 12, a ventilator 13, an air conditioning device 14, a surface temperature measuring apparatus 15, a sunroof driving apparatus 17, a side window 121, and a sunroof 171.

The internal temperature and humidity measuring device 11 measures the internal temperature and internal humidity of the cultivation facility 100. The internal temperature and humidity measuring device 11 includes a temperature sensor 141 and a humidity sensor 142. The temperature sensor 141 measures the internal temperature of the cultivating facility 100. The humidity sensor 142 measures the internal humidity of the plant 100. The internal humidity is the relative humidity within the growing facility 100. The temperature sensor 141 and the humidity sensor 142 are provided at any place within the cultivation facility 100.

The temperature control device 1 controls the internal temperature of the cultivation facility 100 of 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 and humidity measurement device 11.

The air conditioner 14 changes the temperature and humidity in the cultivation facility 100 by using, for example, a heat pump. The air conditioning equipment 14 cools the interior of the cultivation facility 100 by the cooling function, and heats the interior 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 window 121 and the sunroof 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 causes the air conditioner 14 to operate while stopping the ventilator 13 and closing the side window 121 and the sunroof 171.

In addition, the air conditioning apparatus 14 may include a plurality of air conditioning constituent units. For example, the air conditioning unit 14 may also include a plurality of heat pumps. Of the plurality of heat pumps, some heat pumps may perform cooling operation, while others perform heating operation. Accordingly, the temperature and humidity within the cultivating facility 100 can be precisely controlled. In addition, the air conditioning apparatus 14 may also include a heat pump and a combustion type heating machine. The heating function of the air conditioning apparatus 14 can also be achieved by operating the combustion type heating apparatus. In addition, the air conditioning apparatus 14 may also include a dehumidifier as an air conditioning constituent device.

The ventilation fan 13 is provided at an upper portion of a side surface (generally, a surface in a 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 increases due to the incidence of sunlight and is higher than the outside air temperature of the cultivation facility 100. In particular, the high-temperature air tends to stay in the upper portion of the cultivation facility 100, and the high-temperature air is discharged to the outside by the ventilator 13, so that the temperature rise in the cultivation facility 100 can be suppressed. The cultivation system may not include the ventilator 13.

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

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

When the side window 121 and the sunroof 171 are closed, the temperature inside the cultivation facility 100 increases due to the incidence of sunlight and is higher than the outside air temperature of the cultivation facility 100. Then, when the side window 121 and the sunroof 171 are opened, the outside air is introduced into the cultivation facility 100, and thus, the temperature rise in the cultivation facility 100 can be suppressed.

The side window driving device 12 opens and closes the side window 121 in response to a control signal from the temperature control device 1. The side window driving device 12 rotates a straight pipe provided at the lower portion of the side window 121 to automatically open and close the side window 121. The side window 121 may be opened and closed manually. In the case where the side window 121 is manually opened and closed, the side window driving device 12 is not required.

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

The temperature sensor 141 and the humidity sensor 142 transmit the respective measured data to the temperature control device 1. The temperature sensor 141 and the humidity sensor 142 may also transmit voltage outputs corresponding to the values of temperature and humidity, for example, through cables. The temperature sensor 141 and the humidity sensor 142 may transmit the temperature and the humidity as digital signals via 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 out of the plurality of fruits within 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 method of controlling the temperature by which the interior of the cultivation facility 100 is cooled at night and outside air is introduced into the cultivation facility 100 after sunrise will be described on the premise of fruit cultivation.

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 at daytime is, for example, 32 ℃, and the outside air humidity at daytime is, for example, 60%.

At night, the ventilator 13 is stopped, the side window 121 and the louver 171 are closed, and the air conditioner 14 performs a cooling operation. Here, in the present embodiment, a case is considered in which 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 case, when the air conditioner 14 is stopped at sunrise, the ventilator 13 is operated, the side window 121 and the louver 171 are fully opened, and external air having a temperature of 26 ℃ and a humidity of 90% is introduced into the cultivation facility 100, the temperature of the fruits is 21 ℃, and thus, the air around the fruits 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 temperature of the air around the fruit becomes equal to or lower than the dew point temperature, and dew condensation occurs on the fruit.

Therefore, in order to prevent dew condensation of fruits, the temperature of the fruits 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 the humidity control apparatus 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 RAM (Random Access Memory ), SSD (Solid State Drive, solid state disk), or flash memory.

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

The internal temperature and humidity acquisition unit 111 acquires the internal temperature and the internal humidity of the cultivation facility 100 measured by the internal temperature and humidity measurement device 11. The internal temperature and humidity acquisition unit 111 periodically acquires the internal temperature and the internal humidity from the internal temperature and humidity measurement 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 acquisition unit 112 periodically acquires the fruit surface temperature from the surface temperature measurement 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, the 1 st operation mode operates the air conditioner 14 so that the internal temperature reaches a predetermined target temperature in a state where the openable side window 121 and the sunroof 171 that separate the interior from the exterior of the cultivation facility 100 are closed. The 2 nd operation mode 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 apparatus 14 so that the surface temperature of the fruit 10 is higher than the internal dew point temperature in a state where the side window 121 and the sunroof 171 are closed. The 3 rd operation mode stops the air conditioner 14 in a state where the side window 121 and the sunroof 171 are opened.

The temperature control unit 113 includes a 1 st operation mode control unit 131, a 2 nd operation mode control unit 132, and a 3 rd operation mode control unit 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 determines whether or not the current time is the condensation prevention process start time. The condensation prevention process start time is, for example, 3 hours before the sunrise time. If the sunrise time is 6 a.m., the dew condensation preventing treatment is started at 3 a.m. When it is determined that the current time is not the condensation prevention process start time, the 1 st operation mode control unit 131 causes the air conditioner 14 to operate so that the internal temperature reaches the predetermined target temperature in a state where the side window 121 and the sunroof 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. The 1 st operation mode control unit 131 operates the air conditioning equipment 14 so that the internal temperature reaches a predetermined target temperature in a state where the side window 121 and the sunroof 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 and humidity acquisition unit 111 reaches a predetermined target temperature.

For example, when the internal temperature is higher than the predetermined target temperature and the air conditioner 14 is in the stopped state, 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. Further, when the internal temperature is higher than the predetermined target temperature and the air conditioner 14 is in the operating state, the 1 st operation mode control unit 131 does not output a control signal to the air conditioner 14. 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 a predetermined target temperature and the air conditioner 14 is in a stopped state. When the internal temperature is equal to or lower than the predetermined target temperature and the air conditioner 14 is in the operating state, 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 1 st operation mode control unit 131 determines that the current time is the condensation prevention process 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 is higher than the internal dew point temperature in a state where the side window 121 and the sunroof 171 are closed.

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

The condensation prevention process may be ended at a time when a predetermined time has elapsed from the sunrise time. The 2 nd operation mode control unit 132 may transition from the 2 nd operation mode to the 3 rd operation mode after a predetermined time elapses from the sunrise time. The predetermined time is, for example, 2 hours. The condensation prevention process end time may be changed according to seasons. The end time of the dew condensation prevention process may be determined according to the type or size of the cultivated fruit. The time when the internal temperature of the cultivation facility 100 rises due to sunlight after sunrise and the fruit surface temperature is higher than the internal dew point temperature is set as the condensation prevention process 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 it is determined that the current time is not the condensation prevention process 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 is higher than the internal dew point temperature in a state where the side window 121 and the sunroof 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 and 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 vapor pressure/6.11)/(7.5×log (10) +log (6.11/internal vapor pressure)) (1)

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

Internal 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 conditioning equipment 14 so that the surface temperature of the fruit 10 is higher than the internal dew point temperature when the side window 121 and the sunroof 171 are closed. That is, when the fruit surface temperature is higher than the internal dew point temperature and the air conditioner 14 is in the operating state, 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. Further, the 2 nd operation mode control section 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 a stopped state. When the fruit surface temperature is equal to or lower than the internal dew point temperature and the air conditioner 14 is in a stopped state, the 2 nd operation mode control unit 132B outputs a control signal for changing the air conditioner 14 to an operating state to the air conditioner 14. Further, the 2 nd operation mode control section 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 an 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 is higher than the internal dew point temperature in a state where the side window 121 and the sunroof 171 are closed during a period from the start time of the dew point prevention process to the end time of the dew point 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 sunroof 171 are opened. When the 2 nd operation mode control unit 132 determines that the current time is the condensation prevention process 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 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 section 133 does not output a control signal to the air conditioner 14 when the air conditioner 14 is in a stopped state.

The 3 rd operation mode control unit 133 opens the side window 121 and the sunroof 171 stepwise at predetermined time intervals. First, the 3 rd operation mode control unit 133 opens the side window 121 and the sunroof 171 by, for example, 30%. Then, the 3 rd operation mode control unit 133 may open the side window 121 and the sunroof 171 by 100% after a predetermined time elapses from the time of opening the side window 121 and the sunroof 171.

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

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 processing in step S1 is repeated until the current time reaches the night cooling start time.

On the other hand, when it is determined that the current time is the night cooling start time (yes in step S1), the 1 st operation mode control portion 131 determines whether or not the side window 121 and the sunroof 171 are in the closed state. The 1 st operation mode control unit 131 may acquire from the side window driving device 12 and the sunroof driving device 17 which one of the open state and the closed state the side window 121 and the sunroof 171 are. The 1 st operation mode control unit 131 may determine whether or not the side window 121 and the sunroof 171 are in the closed state based on the detection results of the sensors provided in the side window 121 and the sunroof 171.

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

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

Next, in step S4, the 1 st operation mode control unit 131 determines whether or not the current time is the condensation prevention process start time. Here, when it is determined that the current time is not the condensation prevention process start time (no in step S4), the internal temperature and humidity acquisition unit 111 acquires the internal temperature from the internal temperature and 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.

Here, when 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 conditioner 14 is in a stopped state. Here, when it is determined that the air conditioner 14 is not in the stopped state, that is, when 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, when it is determined that the air conditioner 14 is in the stopped state (yes in step S7), 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 in step S8. The air conditioning equipment 14 changes to an operating state if the control signal is acquired. Then, the air conditioner 14 performs the cooling operation so that the internal temperature becomes equal to or lower than the predetermined target temperature.

When 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 or not the air conditioner 14 is in the operating state. Here, when it is determined that the air conditioner 14 is not in the operating state, that is, when 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, when it is determined that the air conditioner 14 is in the operating state (yes in step S9), 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 in step S10. The air conditioning equipment 14 changes to the stopped state if the control signal is acquired from the 1 st operation mode control unit 131. Then, the air conditioning apparatus 14 stops the cooling operation.

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

When it is determined in step S4 that the current time is the condensation prevention process start time (yes in step S4), in step S11, the 2 nd operation mode control unit 132 performs the condensation prevention process for preventing condensation of the fruit. 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 process end time. Here, when it is determined that the current time is the condensation prevention process end time (yes in step S21), the process proceeds to step S12 in fig. 3.

On the other hand, when it is determined that the current time is not the condensation prevention process end time (no in step S21), the fruit surface temperature obtaining unit 112 obtains the fruit surface temperature from the surface temperature measuring device 15 in step S22.

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

Next, in step S25, the 2 nd operation mode control portion 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 ℃. Here, when 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 portion 132 determines whether or not the air conditioning equipment 14 is in an operating state in step S26.

Here, when it is determined that the air conditioner 14 is not in the operating state, that is, when 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, when it is determined that the air conditioner 14 is in the operating state (yes in step S26), 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 in step S27. If the air conditioning equipment 14 acquires the control signal, it changes to the stopped state. Then, the air conditioning apparatus 14 stops the cooling operation.

When 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, when it is determined that the air conditioner 14 is not in the stopped state, that is, when it is determined that the air conditioner 14 is in the operating state (no in step S28), the process proceeds to step S21.

In addition, when it is determined in step S28 that the air conditioner 14 is not in the stopped state, the 2 nd operation mode control section 132 may perform error processing. In the error process, the 2 nd operation mode control portion 132 may notify the user that the fruit surface temperature is not higher than the internal dew point temperature even though the air conditioning apparatus 14 is in an operating state and is performing the cooling operation.

On the other hand, when it is determined that the air conditioner 14 is in the stopped state (yes in step S28), 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 in step S29. The air conditioning equipment 14 changes to an operating state if the control signal is acquired. Then, the air conditioning apparatus 14 performs a cooling operation. If the air conditioner 14 is in an operating state and performs a cooling operation, the internal humidity of the cultivation facility 100 is reduced. As a result, the fruit surface temperature is higher than the internal dew point temperature.

In step S25, the 2 nd operation mode control unit 132 determines whether the fruit surface temperature is higher than the internal dew point temperature +α, but the present invention is not limited to this, 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, the 3 rd operation mode control unit 133 performs a window opening process for opening the side window 121 and the sunroof 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 section 133 determines whether or not the air conditioning apparatus 14 is in an operating state. Here, when it is determined that the air conditioner 14 is not in the operating state, that is, when 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 it is determined that the air conditioner 14 is in the operating state (yes in step S41), 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 in step S42. The air conditioning equipment 14 changes to the stopped state if the control signal is acquired from the 3 rd operation mode control unit 133. Then, the air conditioning apparatus 14 stops the cooling operation.

Next, in step S43, the 3 rd operation mode control unit 133 outputs a control signal for opening the side window 121 and the sunroof 171 by 30% to the side window driving device 12 and the sunroof driving device 17. The side window driving device 12 opens the side window 121 by 30% in response to a control signal from the 3 rd operation mode control unit 133. The sunroof driving device 17 opens the sunroof 171 by 30% in response to a control signal from the 3 rd operation mode control unit 133. The 3 rd operation mode control unit 133 also stores the time when the side window 121 and the sunroof 171 are opened 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 sunroof 171 are opened. The predetermined time is, for example, 30 minutes. Here, when it is determined that the predetermined time has not elapsed from the time when the side window 121 and the sunroof 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 the side window 121 and the sunroof 171 are opened.

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

After the windowing process of step S12 in fig. 3 is performed, the temperature control process is ended.

After sunrise, sunlight enters the cultivation facility 100, and the internal temperature of the cultivation facility 100 increases. The temperature of the fruit rises following the internal temperature of the cultivation facility 100. After a predetermined time has elapsed from the sunrise time, the air conditioning equipment 14 is stopped, the ventilator 13 is operated, and the side window 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 the predetermined target temperature in a state where the side window 121 and the sunroof 171 are closed. The air conditioner 14 is operated such that the surface temperature of the fruit 10 is higher than the internal dew point temperature of the cultivation facility 100 in a state where the side window 121 and the sunrise window 171 are closed from before sunrise to after sunrise. Then, if the internal temperature of the cultivation facility 100 approaches the external temperature of the cultivation facility 100, the air-conditioning apparatus 14 is stopped in a state where the side window 121 and the sunroof 171 are opened. Therefore, when the sunrise rear side window 121 and the sunrise window 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, the side window 121 and the louver 171 are initially opened by 30%, but the present invention is not limited to this. The side window 121 and the louver 171 may be initially opened by 50%, and the ratio of the opening of the side window 121 and the louver 171 is not particularly limited.

In embodiment 1, the 3 rd operation mode control unit 133 opens the side window 121 and the sunroof 171 in 2 stages, but the present invention is not limited to this, and may open the side window 121 and the sunroof 171 in 3 stages or more.

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 indicating that 100% of the side window 121 is opened on the display device or the terminal device.

Similarly, in the case where the cultivation system is not provided with the sunroof driving device 17 and the user manually opens the sunroof 171, the 3 rd operation mode control unit 133 may display a screen instructing to open the sunroof 171 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 sunroof 171 is opened, the 3 rd operation mode control unit 133 may display a screen indicating that the sunroof 171 is opened by 100% on the display device or the terminal device.

Next, a modification 1 of embodiment 1 will be described. In embodiment 1 described above, the 3 rd operation mode control unit 133 opens the side window 121 and the sunroof 171 stepwise in the window opening process, whereas in the 1 st modification of embodiment 1, the 3 rd operation mode control unit 133 opens the side window 121 and the sunroof 171 at one time instead of opening the side window 121 and the sunroof 171 stepwise in the window opening process by 100%.

The processing in step S51 and step S52 is the same as the processing in step S41 and step 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 should be). The side window driving device 12 fully opens the side window 121 in response to a control signal from the 3 rd operation mode control unit 133. The sunroof driving device 17 fully opens the sunroof 171 in response to a control signal from the 3 rd operation mode control unit 133.

In addition, when 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 indicating 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, in a case where the cultivation system is not provided with the sunroof driving device 17 and the user manually opens the sunroof 171, the 3 rd operation mode control unit 133 may display a screen indicating to fully open the sunroof 171 on a display device connected to the temperature control device 1 or a terminal device owned by the user.

Next, modification 2 of embodiment 1 will be described. In embodiment 1 described above, in 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 end time, but in the 2 nd modification of embodiment 1, in the condensation prevention process, the 2 nd operation mode control unit 132 determines whether or not the internal temperature has reached the growth limit temperature which is the growth limit of the fruit.

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

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

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

On the other hand, when it is determined that the internal temperature has not reached the growth limit temperature (no in step S72), the fruit surface temperature acquiring unit 112 acquires the fruit surface temperature from the surface temperature measuring device 15 in step S73.

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

(embodiment 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 process end time, but in embodiment 2, the 2 nd operation mode control unit calculates the external dew point temperature of the cultivation facility 100 based on the external temperature and the external 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 external dew point temperature.

The cultivation system shown in fig. 8 includes a temperature control device 1A, an internal temperature and humidity measuring device 11, a side window driving device 12, a ventilator 13, an air conditioning device 14, a surface temperature measuring device 15, a sunroof driving device 17, a side window 121, a sunroof 171, and an external temperature and humidity measuring 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 and humidity measuring device 16 measures the external temperature and the external humidity of the cultivating facility 100. The external temperature and humidity measuring device 16 includes a temperature sensor 161 and a humidity sensor 162. The temperature sensor 161 measures the external temperature of the plant 100. The humidity sensor 162 measures the external humidity of the plant 100. The external humidity is the relative humidity outside the growing 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 and humidity acquisition unit 111, a fruit surface temperature acquisition unit 112, a temperature control unit 113A, and an external temperature and humidity acquisition unit 114.

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

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

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

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

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

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

External vapor pressure=6.11×10× (7.5×external temperature/(273.3+external temperature)) ×external humidity/100 (4)

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

The other functions of the 2 nd operation mode control section 132A are the same as those of the 2 nd operation mode control section 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 of embodiment 2 is different from the temperature control process of the temperature control device 1 of embodiment 1 only in the condensation prevention process. Therefore, in the following description, only the dew condensation prevention processing according to 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 and humidity acquisition unit 114 acquires the external temperature and the external humidity from the external temperature and humidity measurement device 16.

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

Next, in step S94, the 2 nd operation mode control portion 132A determines whether the fruit surface temperature is higher than the external dew point temperature. Here, when 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 it is determined that the fruit surface temperature is equal to or lower than the external dew point temperature (no in step S94), the fruit surface temperature acquiring unit 112 acquires the fruit surface temperature from the surface temperature measuring device 15 in step S95.

The processing of step S95 to step S102 is the same as the processing of step S22 to step 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 the fruit surface temperature acquired in step S91 is higher than the internal dew point temperature +α. At this time, in step S95, the fruit surface temperature acquiring unit 112 may not acquire the fruit surface temperature from the surface temperature measuring device 15.

In step S94, the 2 nd operation mode control unit 132A determines whether the fruit surface temperature is higher than the external dew point temperature, but the present invention is not limited to this, 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 external 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 3

In embodiment 1 described above, 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 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 view showing the configuration of a cultivation system according to embodiment 3 of the present invention, and fig. 12 is a block diagram showing the configuration of a temperature control apparatus according to embodiment 3 of the present invention.

The cultivation system shown in fig. 11 includes a temperature control apparatus 1B, an internal temperature and humidity measuring apparatus 11, a side window driving apparatus 12, a ventilator 13, an air conditioner 14, a sunroof driving apparatus 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 and 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 the estimated value of the surface temperature of the fruit is correlated with the internal temperature of the cultivation facility 100 at the time of transition to the dew condensation prevention process (the 2 nd operation mode) and the elapsed time from the time of transition to the dew condensation prevention process (the 2 nd operation mode).

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

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

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

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

When the side window 121 and the sunroof 171 are closed, the 2 nd operation mode control unit 132B operates the air conditioning equipment 14 so that the estimated value of the surface temperature of the fruit 10 is higher than the internal dew point temperature. That is, when the estimated value of the fruit surface temperature estimated by the fruit surface temperature estimating unit 115 is higher than the internal dew point temperature and the air conditioner 14 is in the operating state, 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. Further, the 2 nd operation mode control portion 132B does not output a control signal to the air conditioner 14 when the estimated value of the fruit surface temperature is higher than the internal dew point temperature and the air conditioner 14 is in a stopped state. 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, 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. 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 an operating state.

The other functions of the 2 nd operation mode control section 132B are the same as those of the 2 nd operation mode control section 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 dew condensation preventing process according to embodiment 3 will be described.

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

Next, in step S112, the internal temperature and 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 process end time. Here, when it is determined that the current time is the condensation prevention process end time (yes in step S113), the process proceeds to step S12 in fig. 3.

On the other hand, when it is determined that the current time is not the condensation prevention process 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 estimation unit 115 extracts, from the surface temperature estimation table stored in the memory 102B, an estimated value of the fruit surface temperature corresponding to the internal temperature at the time of the dew condensation prevention treatment transition and the elapsed time from the dew condensation prevention treatment transition.

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

Next, in step S117, the 2 nd operation mode control portion 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 ℃. Here, when 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 or not the air conditioner 14 is in the operating state in step S118.

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

When 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 conditioning equipment 14 is in a stopped state.

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

In addition, when it is determined in step S120 that the air conditioner 14 is not in the stopped state, the 2 nd operation mode control section 132B may perform error processing. In the error process, the 2 nd operation mode control portion 132B may notify the user that the fruit surface temperature is not higher than the internal dew point temperature even though the air conditioning apparatus 14 is in an operating state and is performing the cooling operation.

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 limited to this, 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 may be applied to embodiment 2 described above.

In embodiments 1 to 3 described above, a temperature control method for preventing dew condensation on the surface of fruits is described, which focuses attention on switching from night cooling to daytime outside air introduction in hot and humid areas.

However, even in areas other than the hot and humid areas, when the temperature and humidity in the vicinity of the fruit change during cultivation, 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 is higher than the internal dew point temperature of the cultivation facility 100.

In embodiments 1 to 3, the cultivation system includes the side window 121 and the sunroof 171, but the present invention is not limited to this, and may include only any one of the side window 121 and the sunroof 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 a program executing section such as a CPU or a processor by reading and executing a software program stored in a recording medium such as a hard disk or a semiconductor memory.

Some or all of the functions of the device according to the embodiment of the present invention are typically implemented as an integrated circuit LSI (Large Scale Integration). These functions may be integrated into 1 chip alone or may be integrated into 1 chip in a manner that includes some or all of the functions. The integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. A programmable FPGA (Field Programmable Gate Array ) after LSI manufacturing or a reconfigurable processor for reconfiguring connection or setting of circuit elements inside the LSI may be used.

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

The numerals used above are all numerals exemplified for the purpose of specifically explaining the present invention, and the present invention is not limited to the exemplified numerals.

The order in which the steps shown in the flowcharts are executed is an order exemplified for the purpose of specifically explaining the present invention, and orders other than those described above may be adopted within a range where the same effect is obtained. In addition, some of the steps may be performed simultaneously (in parallel) with other steps.

Industrial applicability

The technique according to the present invention can reliably prevent dew condensation on the surface of fruits, and thus has a useful value as a technique for controlling the internal temperature of a cultivation facility for fruits.

Claims

1. A temperature control method of 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; the method comprises the steps of,

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

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 window that separates the interior from the exterior of the cultivation facility is closed,

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

the 3 rd operation mode, in a state where the window is opened, stops the air conditioning apparatus,

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

2. The method for controlling temperature according to claim 1, wherein,

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

3. The method for controlling temperature according to claim 1, wherein,

in case the internal temperature reaches a temperature of the limit of growth of the fruit, a transition is made from the 2 nd operation mode to the 3 rd operation mode.

4. The method for controlling temperature according to claim 1, wherein,

the external temperature and the external humidity of the cultivation facility are also obtained;

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

5. The method for controlling temperature according to claim 1, wherein,

extracting, from a table in which an internal temperature of the cultivation facility at a time point at which the cultivation facility is to be shifted to the 2 nd operation mode and an elapsed time from the time point at which the cultivation facility is to be shifted to the 2 nd operation mode correspond to estimated values of the surface temperature of the fruit, the estimated values corresponding to the internal temperature at the time point at which the cultivation facility is to be shifted to the 2 nd operation mode and the elapsed time from the time point at which the cultivation facility is to be shifted to the 2 nd operation mode correspond to each other.

6. The method for controlling temperature according to any one of claims 1 to 4, wherein,

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

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

an acquisition unit that acquires an internal temperature and an internal humidity of the cultivation facility; the method comprises the steps of,

a control unit that controls the internal temperature of the cultivation facility by sequentially switching between a 1 st operation mode, a 2 nd operation mode, and a 3 rd operation mode, wherein,

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

9. A temperature control system, comprising:

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

an air conditioning apparatus; the method comprises the steps of,

an openable window for separating the interior of the cultivation facility from the exterior, wherein,

the temperature control device includes:

the 1 st operation mode operates the air conditioning apparatus in such a manner that the internal temperature reaches a predetermined target temperature in a state where the window is closed,

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

acquiring the surface temperature of the fruit from a sensor that measures the surface temperature of the fruit; the method comprises the steps of,

And the 3 rd operation mode is used for stopping the air conditioning equipment in a state that the window is opened.

11. A temperature control device for controlling an 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; the method comprises the steps of,

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

13. A temperature control system, comprising:

An air conditioning apparatus;

an openable window that separates the interior of the cultivation facility from the exterior; the method comprises the steps of,

a sensor for measuring the surface temperature of the fruit, wherein,

the temperature control device includes:

an acquisition unit that acquires a surface temperature of the fruit from the sensor; the method comprises the steps of,