CN112902486A - Constant temperature and humidity unit and control method thereof - Google Patents

Constant temperature and humidity unit and control method thereof Download PDF

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Publication number
CN112902486A
CN112902486A CN201911222468.4A CN201911222468A CN112902486A CN 112902486 A CN112902486 A CN 112902486A CN 201911222468 A CN201911222468 A CN 201911222468A CN 112902486 A CN112902486 A CN 112902486A
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humidity
temperature
indoor
controlling
air supply
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CN201911222468.4A
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CN112902486B (en
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赵锐
沈智广
何洪炜
童庆国
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Zhejiang Dunan Electro Mechanical Technology Co Ltd
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Zhejiang Dunan Electro Mechanical Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a constant temperature and humidity unit and a control method thereof. Wherein, the method comprises the following steps: acquiring indoor temperature and indoor humidity; controlling the electromagnetic valve in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity; wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit including: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and the indoor heat exchanger that connects gradually, the reheat circuit includes: the indoor heat exchanger comprises a reheating condenser and a second electronic expansion valve which are sequentially connected, wherein the second electronic expansion valve is connected with the indoor heat exchanger, and the solenoid valve is connected between the four-way valve and the reheating condenser. The invention solves the technical problems of more energy consumption and lower resource utilization rate of the constant temperature and humidity unit in the related technology.

Description

Constant temperature and humidity unit and control method thereof
Technical Field
The invention relates to the technical field of vapor compression refrigeration, in particular to a constant temperature and humidity unit and a control method thereof.
Background
The existing constant temperature and humidity air conditioning unit adopts the mixing of fresh air and return air, and then carries out the temperature reduction and dehumidification treatment, and carries out the dew point temperature control and the reheating control. Most reheating devices are resistance wires or PTC (Positive Temperature Coefficient) semiconductor ceramics, and the reheating devices consume high-energy-grade electric energy, are poor in economical efficiency and have the risk of fire caused by Temperature runaway.
The existing full fresh air constant temperature or constant temperature and humidity unit is used for processing a fresh air working condition, the refrigerating capacity and the heat exchanger are usually selected according to the highest or lowest environmental temperature and humidity during system design, the difference between the set temperature and humidity and the fresh air temperature and humidity is smaller in transition seasons, in addition, fresh air has a dynamic change trend, a control system cannot control the loading and unloading of a compressor well, and a steam compression system is protected very easily, so that a user cannot use the unit normally.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a constant temperature and humidity unit and a control method thereof, which at least solve the technical problems of more energy consumption and lower resource utilization rate of the constant temperature and humidity unit in the related technology.
According to an aspect of the embodiments of the present invention, there is provided a control method for a constant temperature and humidity unit, including: acquiring indoor temperature and indoor humidity; controlling the electromagnetic valve in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity; wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit including: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and the indoor heat exchanger that connects gradually, the reheat circuit includes: the indoor heat exchanger comprises a reheating condenser and a second electronic expansion valve which are sequentially connected, wherein the second electronic expansion valve is connected with the indoor heat exchanger, and the solenoid valve is connected between the four-way valve and the reheating condenser.
Further, based on the indoor temperature and the indoor humidity, controlling the on or off of the electromagnetic valve in the constant temperature and humidity unit comprises: acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; comparing the indoor temperature with the temperature difference, and comparing the indoor humidity with the humidity difference; if the indoor temperature is less than or equal to the temperature difference and the indoor humidity is less than or equal to the humidity difference, the electromagnetic valve is controlled to be closed; and if the indoor temperature is greater than the temperature difference value or the indoor humidity is greater than the humidity difference value, controlling the electromagnetic valve to be conducted.
Further, after the solenoid valve is controlled to be conducted, the method further comprises: acquiring air supply temperature and air supply humidity; controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the air supply temperature; the frequency of the compressor is controlled based on the indoor humidity and the supply air humidity.
Further, controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the supply air temperature includes: obtaining a set air supply temperature based on the indoor temperature and the set indoor temperature; and controlling the opening degree of the second electronic expansion valve based on the acquired air supply temperature and the set air supply temperature.
Further, controlling the frequency of the compressor based on the indoor humidity and the supply air humidity includes: obtaining a set air supply humidity based on the indoor humidity and the set indoor humidity; and controlling the frequency of the compressor based on the acquired air supply humidity and the set air supply humidity.
Further, the method further comprises: controlling the reheating electric heater and the preheating electric heater in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity; and controlling the on or off of a humidifier in the constant temperature and humidity unit based on the indoor humidity.
Further, based on the indoor temperature and the indoor humidity, controlling the reheating electric heater and the preheating electric heater in the constant temperature and humidity unit to be turned on or off comprises: acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; under the condition that the indoor temperature is greater than the sum of the temperature difference value and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision, controlling the conduction of the reheating electric heater and closing the preheating electric heater; under the condition that the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and is less than or equal to the difference between the humidity difference and the humidity control precision, controlling the reheating electric heater and the preheating electric heater to be closed; and controlling the conduction of the reheating electric heater and the preheating electric heater under the condition that the indoor temperature is less than or equal to the difference between the temperature difference value and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision.
Further, controlling the on or off of the humidifier in the constant temperature and humidity unit based on the indoor humidity comprises: acquiring the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; controlling the humidifier to be closed under the condition that the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision; and controlling the humidifier to be conducted under the condition that the indoor temperature is less than or equal to the difference between the humidity difference value and the humidity control precision.
Further, after the control solenoid valve is closed, the method further comprises: acquiring the air supply temperature; the frequency of the compressor is controlled based on the indoor temperature and the supply air temperature.
Further, after controlling the frequency of the compressor, the method further comprises: judging whether the frequency value of the compressor reaches the maximum frequency value of the compressor or not; if the frequency value reaches the maximum frequency value, acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value; judging whether the indoor temperature is within a first preset range of the temperature difference value, wherein the first preset range is determined by the temperature control precision; and if the indoor temperature is not within the first preset range, controlling the reheating electric heater in the constant temperature and humidity unit to be conducted.
Further, after the control electromagnetic valve is closed, the humidifier in the constant temperature and humidity unit is controlled to be conducted.
Further, after the electromagnetic valve in the constant temperature and humidity unit is controlled to be turned on or off, the method further comprises the following steps: acquiring air supply temperature and air supply humidity; and if the air supply temperature is in a second preset range of the set air supply temperature and the air supply humidity is in a third preset range of the set air supply humidity, controlling the constant-temperature and constant-humidity unit to operate according to the ventilation mode.
According to another aspect of the embodiments of the present invention, there is also provided a constant temperature and humidity unit, including: a primary loop comprising: the indoor heat exchanger comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve and an indoor heat exchanger which are connected in sequence; a reheat circuit comprising: the reheating condenser and the second electronic expansion valve are sequentially connected, and the second electronic expansion valve is connected with the indoor heat exchanger; the electromagnetic valve is connected between the four-way valve and the reheating condenser; the first sensor is used for collecting indoor temperature and indoor humidity; and the controller is connected with the electromagnetic valve and the first sensor and is used for controlling the electromagnetic valve to be switched on or switched off based on the indoor temperature and the indoor humidity.
Further, constant temperature and humidity unit still includes: the second sensor is used for acquiring the air supply temperature and the air supply humidity; and the controller is connected with the second sensor, the second electronic expansion valve and the compressor, and is used for controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the air supply temperature and controlling the frequency of the compressor based on the indoor humidity and the air supply humidity.
Further, constant temperature and humidity unit still includes: a reheat electric heater; preheating an electric heater; a humidifier; and the controller is connected with the reheating electric heater, the preheating electric heater and the humidifier and is used for controlling the reheating electric heater and the preheating electric heater to be switched on or off based on the indoor temperature and the indoor humidity and controlling the humidifier to be switched on or off based on the indoor humidity.
Further, constant temperature and humidity unit still includes: the second sensor is used for collecting the air supply temperature; and the controller is connected with the second sensor and the compressor and is used for controlling the frequency of the compressor based on the indoor temperature and the air supply temperature.
Further, constant temperature and humidity unit still includes: a reheat electric heater; and the controller is connected with the reheating electric heater and used for acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value if the frequency value of the compressor reaches the maximum frequency value, judging whether the indoor temperature is within a first preset range of the temperature difference value, and controlling the reheating electric heater to be conducted if the indoor temperature is not within the first preset range, wherein the first preset range is determined by the temperature control precision.
Further, constant temperature and humidity unit still includes: a humidifier; and the controller is connected with the humidifier and is used for controlling the conduction of the humidifier in the constant temperature and humidity unit after the control electromagnetic valve is closed.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus on which the storage medium is located is controlled to execute the control method of the constant temperature and humidity unit.
According to another aspect of the embodiment of the present invention, a processor is further provided, where the processor is configured to execute a program, where the program executes the control method for the constant temperature and humidity unit.
In the embodiment of the invention, after the indoor temperature and the indoor humidity are obtained, the electromagnetic valve for connecting the main loop and the reheating loop can be controlled to be switched on or off based on the obtained data, so that the switching on and off of the reheating condenser are realized. Compared with the prior art, the reheating device directly utilizing electric energy to heat is replaced by the reheating condenser, the condensation heat carried by high-temperature refrigerant steam discharged by the compressor is used as a reheating heat source of the unit, extra electric energy does not need to be consumed, and the outlet air temperature of the unit can be ensured to be at the target value of the control system. In winter that does not need cooling dehumidification, on the contrary needs heating up humidification, refrigerating system switches the refrigerant flow direction through the cross valve, absorb the heat in the outdoor air as the heat supply heat source, realized the function that refrigerating system heat pump heated, theoretical circulation energy efficiency ratio is invariably greater than 1, under the condition that provides the same heat, the consumption electric energy is still less, and make full use of the equipment in the unit, reached and reduced electric energy consumption, improve resource utilization's effect, and then solved among the relevant technology constant temperature and humidity unit energy consumption more, the lower technical problem of resource utilization.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a control method of a constant temperature and humidity unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative refrigeration system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative constant temperature and humidity unit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an alternative control system for the constant temperature and humidity machine set according to an embodiment of the present invention; and
fig. 5 is a schematic diagram of a constant temperature and humidity unit according to an embodiment of the invention.
Wherein the drawings include the following reference numerals:
00. an electromagnetic valve; 11. a compressor; 12. a four-way valve; 13. an outdoor heat exchanger; 14. a main electronic expansion valve; 15. an indoor heat exchanger; 16. a gas-liquid separator; 17. a reservoir; 18. an oil separator; 1. a check valve 1; 2. a check valve 2; 3. a check valve 3; 4. a check valve 4; 21. a reheat condenser; 22. an auxiliary electronic expansion valve; 31. a controller; 32. a sensor; 33. a humidifier; 34. a reheat electric heater; 35. preheating an electric heater; 36. a fan.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, there is provided a method for controlling a constant temperature and humidity unit, where it is noted that the steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from the order shown.
Fig. 1 is a flowchart of a control method of a constant temperature and humidity unit according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
step S102, acquiring indoor temperature and indoor humidity.
Specifically, the indoor temperature and the indoor humidity can be acquired by a sensor arranged in the constant temperature and humidity unit and used for detecting the temperature and the humidity.
Step S104, controlling the electromagnetic valve in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity; wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit including: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and the indoor heat exchanger that connects gradually, the reheat circuit includes: the indoor heat exchanger comprises a reheating condenser and a second electronic expansion valve which are sequentially connected, wherein the second electronic expansion valve is connected with the indoor heat exchanger, and the solenoid valve is connected between the four-way valve and the reheating condenser.
Specifically, the constant temperature and humidity unit is divided from unit modules, and may include an indoor unit for processing indoor air temperature and humidity, and an outdoor unit for exchanging energy with outdoor environment; the functional implementation modules are divided and can comprise a vapor compression refrigeration system, an electrical control system and an air handling system. The components of the refrigeration system and the electrical control system are present in both the indoor unit and the outdoor unit, and in the embodiment of the present invention, the position of a certain component is not specified.
The refrigerating system mainly comprises a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger and a reheating condenser which are connected into a circulating system through copper pipes according to a certain sequence. As shown in fig. 2, in an alternative scheme, two loops, a main loop of a refrigeration cycle and a condensation reheating loop are separated from an exhaust port of a compressor 11, the condensation reheating loop is connected with a reheating condenser 21 of an indoor unit through a solenoid valve 00, and is converged with the main loop into an indoor heat exchanger 15 through an auxiliary electronic expansion valve 22 (namely, the second electronic expansion valve), a four-way valve 12 of the main loop is respectively connected with the exhaust port of the compressor 11, an air suction port of the compressor 11, an outdoor heat exchanger 13 and the indoor heat exchanger 15, a gas-liquid separator 16 is arranged between the air suction port of the compressor 11 and the four-way, an accumulator 17, a main electronic expansion valve 14 (i.e., the first electronic expansion valve described above), and four check valves 1 to 4 provided to ensure unidirectional flow of the refrigerant through the accumulator 17 and the main electronic expansion valve 14 are provided between the outdoor heat exchanger 13 and the indoor heat exchanger 15.
The electric control system mainly comprises a communicator, a regulator, an actuator and the like, and is connected into a control system through a cable. As shown in fig. 3, the constant temperature and humidity unit further includes: the air conditioner comprises a controller 31, two sensors 32, a humidifier 33, a reheating electric heater 34, a preheating electric heater 35 and a fan 36, wherein one sensor 32 is arranged behind the preheating electric heater 35 and used for collecting the temperature heated by the preheating electric heater 35, and the other sensor 32 is arranged at an air supply opening and can collect the air supply temperature and the air supply humidity.
As shown in fig. 4, the control system includes an internal machine control system and an external machine control system, and the two control systems are connected through a communication link. The internal Machine control system comprises a programmable control system, can control the reheating electric heater, the humidifier, the fan and the auxiliary electronic expansion valve, reads data collected by the sensor, and provides an HMI (Human Machine Interface) for a user. The outdoor unit control system comprises an outdoor unit controller which can control the main electronic expansion valve, the outer fan, the four-way valve and the gas-liquid separator, reads data collected by the sensor and controls the frequency of the compressor through the variable-frequency driver, wherein the outdoor unit controller is connected with the variable-frequency driver through a communication link.
In an optional scheme, when the indoor temperature or the indoor humidity is high, the unit can be controlled to enter a refrigeration and dehumidification mode, at the moment, the flow direction of a refrigerant is switched through the four-way valve, the outdoor heat exchanger serves as an evaporator, heat is absorbed from the outdoor environment, the indoor heat exchanger serves as a condenser, heat is released to the indoor environment, and the traditional heating device directly generating heat through electric energy is reduced or cancelled. When the indoor temperature and humidity are low, the unit can be controlled to enter a heating and humidifying mode, and at the moment, the condensation reheating loop is switched by the electromagnetic valve and does not participate in circulation.
In the cooling and dehumidification mode, a low-temperature low-pressure two-phase refrigerant is input to the main/sub electronic expansion valve, and the main electronic expansion valve controls the degree of superheat of the refrigerant at the outlet of the indoor heat exchanger.
According to the embodiment of the invention, after the indoor temperature and the indoor humidity are obtained, the electromagnetic valve for connecting the main loop and the reheating loop can be controlled to be switched on or off based on the obtained data, so that the switching on and off of the reheating condenser are realized. Compared with the prior art, the reheating device directly utilizing electric energy to heat is replaced by the reheating condenser, the condensation heat carried by high-temperature refrigerant steam discharged by the compressor is used as a reheating heat source of the unit, extra electric energy does not need to be consumed, and the outlet air temperature of the unit can be ensured to be at the target value of the control system. In winter that does not need cooling dehumidification, on the contrary needs heating up humidification, refrigerating system switches the refrigerant flow direction through the cross valve, absorb the heat in the outdoor air as the heat supply heat source, realized the function that refrigerating system heat pump heated, theoretical circulation energy efficiency ratio is invariably greater than 1, under the condition that provides the same heat, the consumption electric energy is still less, and make full use of the equipment in the unit, reached and reduced electric energy consumption, improve resource utilization's effect, and then solved among the relevant technology constant temperature and humidity unit energy consumption more, the lower technical problem of resource utilization.
Optionally, in an embodiment of the present invention, controlling on or off of the solenoid valve in the constant temperature and humidity unit based on the indoor temperature and the indoor humidity includes: acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; comparing the indoor temperature with the temperature difference, and comparing the indoor humidity with the humidity difference; if the indoor temperature is less than or equal to the temperature difference and the indoor humidity is less than or equal to the humidity difference, the electromagnetic valve is controlled to be closed; and if the indoor temperature is greater than the temperature difference value or the indoor humidity is greater than the humidity difference value, controlling the electromagnetic valve to be conducted.
Specifically, the set indoor temperature and the set indoor humidity may be set by a user, and are the temperature and humidity that the constant temperature and humidity unit needs to reach, where the set indoor temperature is represented by Ts and the set indoor humidity is represented by ds. The preset heat load can be a preset unit temperature rise and a room heat load, is denoted by a, and can be set to be 2-10, and is exemplified by 6 in the embodiment of the invention. The preset moisture load may be a preset room moisture load, denoted by b, and may be set to 0 to 5, which is exemplified by 2 in the embodiment of the present invention.
In the embodiment of the application, the constant temperature and humidity unit is mainly controlled by the fresh air, and the control system selects a corresponding operation mode according to the fresh air working condition. In an optional scheme, when the indoor temperature Tx is less than or equal to Ts-a and the indoor humidity dx is less than or equal to ds-b, the control unit enters a heating and humidifying mode, at the moment, the electromagnetic valve is closed, and a condensation reheating loop is switched by the electromagnetic valve and does not participate in circulation; otherwise, the unit is controlled to enter a refrigeration and dehumidification mode, at the moment, the electromagnetic valve is conducted, and the condensation reheating loop participates in circulation.
In an alternative scheme, as shown by solid arrows in fig. 2 and 3, in the cooling and dehumidifying mode, in the main loop portion, high-temperature and high-pressure refrigerant vapor discharged by the compressor 11 firstly passes through the oil separator 18, a part of the high-temperature and high-pressure refrigerant vapor enters the outdoor heat exchanger 13 through the four-way valve 12 to be condensed and release heat to become medium-temperature and high-pressure liquid refrigerant, enters the liquid accumulator 17 through the one-way valve 1, then enters the main electronic expansion valve 14 to be throttled and decompressed to low-temperature and low-pressure gas-liquid two-phase refrigerant, flows out of the one-way valve 3, enters the indoor heat exchanger 15, evaporates and absorbs heat to become low-temperature and low-pressure refrigerant vapor with a certain superheat degree, enters the gas-liquid separator. The other part of high-temperature and high-pressure refrigerant steam discharged by the oil separator 18 enters the reheating condenser 21 to heat the air cooled and dehumidified by the indoor heat exchanger 15, then is condensed into a medium-temperature and high-pressure liquid refrigerant, is throttled and decompressed by the auxiliary electronic expansion valve 22 to be converged with the main loop refrigerant, enters the indoor heat exchanger 15 until returning to the compressor 11, and the cycle is repeated.
In another alternative, as shown by the dashed arrows in fig. 2 and 3, in the heating and humidifying mode, the condensation reheat circuit does not participate in the cycle, and the connection with the main circuit is cut off by closing the solenoid valve 00. In the main loop part, high-temperature and high-pressure refrigerant steam discharged by a compressor 11 firstly passes through an oil separator 18, enters an indoor heat exchanger 15 through a four-way valve 12 to be condensed and release heat to become medium-temperature and high-pressure liquid refrigerant, enters a liquid storage device 17 through a one-way valve 2, is throttled and decompressed by a main electronic expansion valve 14 to become low-temperature and low-pressure gas-liquid two-phase refrigerant, flows out of the one-way valve 4, enters an outdoor heat exchanger 13, evaporates and absorbs heat to become low-temperature and low-pressure refrigerant steam with certain superheat degree, enters a gas-liquid separator 16 through the four-way valve 12 to separate out possible liquid, all.
It should be noted that, because the full new trend operating mode needs to deal with the transition season, the compressor needs to operate for a long time under the low frequency this moment, in order to guarantee that the compressor can not lack of oil, need guarantee periodic oil return.
Optionally, in an embodiment of the present invention, after the solenoid valve is controlled to be turned on, the method further includes: acquiring air supply temperature and air supply humidity; controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the air supply temperature; the frequency of the compressor is controlled based on the indoor humidity and the supply air humidity.
In the embodiment of the application, the temperature and humidity control mode of the constant temperature and humidity unit is series control, that is, the electrical control system shown in fig. 3 adopts a cascade adjustment mode, so that the control precision and the control sensitivity of the system are improved. The compressor can adjust the gas transmission amount by adopting a direct current speed regulation mode, so that the refrigerating capacity and the heating capacity of the system meet the precision requirement of the constant temperature and humidity unit.
Specifically, the air supply temperature and the air supply humidity can be acquired by a sensor arranged in the constant temperature and humidity unit and used for detecting the temperature and the humidity. As shown in fig. 3, the temperature and humidity of the air supply may be collected by a sensor 32 provided at the air supply outlet.
Under the refrigeration and dehumidification mode, the reheating quantity of the reheating condenser is determined by adjusting the liquid refrigerant in the reheating condenser through the opening degree of the auxiliary electronic expansion valve, and then the effective heat exchange area is adjusted, so that the control of the reheating quantity is realized. In an alternative scheme, the opening degree of the auxiliary electronic expansion valve can be adjusted through the indoor temperature and the supply air temperature, and the frequency of the compressor can be adjusted through the indoor humidity and the supply air humidity.
Alternatively, in an embodiment of the present invention, controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the supply air temperature includes: obtaining a set air supply temperature based on the indoor temperature and the set indoor temperature; and controlling the opening degree of the second electronic expansion valve based on the acquired air supply temperature and the set air supply temperature.
The refrigeration and dehumidification control mode is a control strategy used when the indoor temperature and humidity are higher than the set values of users. At the moment, the central controller analyzes the actual demand of a user through an algorithm, calculates a cold demand and converts the cold demand into the rotating speed of the frequency converter, simultaneously sends a starting instruction of the outer machine compressor to the outer machine controller, controls to open the steam and liquid electromagnetic valves of the pipeline and gives an initial opening degree to the electronic expansion valve, and then operates the outer fan and the compressor according to logic. In an optional scheme, the collected indoor temperature and the set indoor temperature can be compared, the set air supply temperature is determined through PID (proportional-integral-derivative) control, after the collected air supply temperature is compared with the set air supply temperature, the opening degree of the auxiliary electronic expansion valve is controlled and driven through PID, so that the air supply temperature reaches the set value, and further the indoor temperature reaches the set value.
Optionally, in an embodiment of the present invention, controlling the frequency of the compressor based on the indoor humidity and the supply air humidity includes: obtaining a set air supply humidity based on the indoor humidity and the set indoor humidity; and controlling the frequency of the compressor based on the acquired air supply humidity and the set air supply humidity.
During the operation of the refrigeration and dehumidification mode, the central controller monitors the indoor humidity and dynamically adjusts the rotation speed of the frequency converter, thereby adjusting the frequency of the compressor. In an optional scheme, the collected indoor humidity and the set indoor humidity can be compared, the set air supply humidity is determined by PID (proportional-integral-derivative) control, and after the collected air supply humidity is compared with the set air supply humidity, the frequency of the variable frequency compressor is controlled by PID to make the air supply humidity reach the set value, so that the indoor humidity reaches the set value.
In the cooling and dehumidifying mode, PID requirements of temperature and humidity are calculated at the same time, and the larger one is output, and the larger one is used for priority control.
Optionally, in an embodiment of the present invention, the method further includes: controlling the reheating electric heater and the preheating electric heater in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity; and controlling the on or off of a humidifier in the constant temperature and humidity unit based on the indoor humidity.
In the operation process of the refrigeration and dehumidification mode, because the humidity is over-limited due to the fact that air is supplied to the indoor after being directly cooled, in an optional scheme, the electric heaters (including the reheating electric heater and the preheating electric heater) can be loaded or unloaded according to the indoor temperature and humidity change. When the indoor humidity is close to the set humidity and has a descending trend, the humidifier outputs an opening degree according to calculation to perform humidity compensation.
It should be noted that, when the compressor reaches a set frequency, the reheating electric heater is turned on in a linkage manner.
Optionally, in an embodiment of the present invention, controlling the reheating electric heater and the preheating electric heater in the constant temperature and humidity unit to be turned on or off based on the indoor temperature and the indoor humidity includes: acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; under the condition that the indoor temperature is greater than the sum of the temperature difference value and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision, controlling the conduction of the reheating electric heater and closing the preheating electric heater; under the condition that the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and is less than or equal to the difference between the humidity difference and the humidity control precision, controlling the reheating electric heater and the preheating electric heater to be closed; and controlling the conduction of the reheating electric heater and the preheating electric heater under the condition that the indoor temperature is less than or equal to the difference between the temperature difference value and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision.
Specifically, the above-described temperature control accuracy may be represented by Δ T, the humidity control accuracy may be represented by Δ d, and the re-determination may be made every 3 min.
In an alternative scheme, when Tx > (Ts-a) + delta T and dx > (ds-b) + delta d, the variable frequency compressor, the electromagnetic valve and the reheating electric heater are started, and the humidity control is prioritized; when Tx > (Ts-a) +. DELTA.T and dx ≦ (ds-b) -DELTA.d, starting the inverter compressor and prioritizing temperature control; when Tx is less than or equal to (Ts-a) -delta T and dx is (ds-b) + delta d, the variable frequency compressor, the electromagnetic valve, the reheating electric heater and the preheating electric heater are started (the low voltage of the system is prevented from being too low), and the humidity control is prioritized.
Optionally, in an embodiment of the present invention, controlling on or off of a humidifier in the constant temperature and humidity unit based on the indoor humidity includes: acquiring the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; controlling the humidifier to be closed under the condition that the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision; and controlling the humidifier to be conducted under the condition that the indoor temperature is less than or equal to the difference between the humidity difference value and the humidity control precision.
In an alternative scheme, when dx > (ds-b) + Δ d indicates that the indoor humidity does not have a downward trend compared with the set indoor humidity, the humidifier does not need to be started; when dx is less than or equal to (ds-b) -delta d, the starting shows that the indoor humidity is close to the set indoor humidity and moves downwards, and the humidifier is started for humidity compensation.
Optionally, in an embodiment of the present invention, after the controlling solenoid valve is closed, the method further includes: acquiring the air supply temperature; the frequency of the compressor is controlled based on the indoor temperature and the supply air temperature.
Specifically, the air supply temperature and the air supply humidity can be acquired by a sensor arranged in the constant temperature and humidity unit and used for detecting the temperature and the humidity. As shown in fig. 3, the temperature and humidity of the air supply may be collected by a sensor 32 provided at the air supply outlet.
The heating and humidifying mode is a control strategy used when the indoor temperature and the humidity are both lower than the set values of the user. At the moment, the central controller analyzes the actual demand of a user through an algorithm, calculates a heat demand and converts the heat demand into the rotating speed of the frequency converter, simultaneously sends a starting instruction of the compressor of the outer machine to the controller of the outer machine, controls to open the steam and liquid electromagnetic valves of the pipeline and gives an initial opening degree to the electronic expansion valve, then the outer fan and the compressor are operated according to logic, and the four-way valve is switched to heating after the compressor is operated for a period of time. The central controller monitors the indoor load change and dynamically adjusts the rotating speed of the frequency converter.
In an optional scheme, the collected indoor temperature and the set indoor temperature can be compared, the set air supply temperature is determined through PID (proportional-integral-derivative) control, and after the collected air supply temperature is compared with the set air supply temperature, the frequency of the variable frequency compressor is controlled and driven through PID, so that the air supply temperature reaches the set value, and further the indoor temperature reaches the set value.
Optionally, in an embodiment of the present invention, after controlling the frequency of the compressor, the method further includes: judging whether the frequency value of the compressor reaches the maximum frequency value of the compressor or not; if the frequency value reaches the maximum frequency value, acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value; judging whether the indoor temperature is within a first preset range of the temperature difference value, wherein the first preset range is determined by the temperature control precision; and if the indoor temperature is not within the first preset range, controlling the reheating electric heater in the constant temperature and humidity unit to be conducted.
Specifically, the first preset range may be set according to actual conditions, for example, the first preset range may be set to 0, that is, whether the indoor temperature reaches the set indoor temperature is determined, and the first preset range may be set according to actual fluctuation conditions in consideration of temperature fluctuation in the control process.
In an alternative scheme, in the heating and humidifying mode, when the compressor is started to the maximum rotating speed, the indoor temperature still does not reach the set temperature, and then the electric heating is started to compensate.
Optionally, in the embodiment of the present invention, after the control solenoid valve is closed, a humidifier in the constant temperature and humidity unit is controlled to be turned on.
In an optional scheme, in the heating and humidifying mode, the temperature of air fed into the room is high, the humidity is low, and a humidifier needs to be started for humidifying in order to meet the indoor humidity.
Optionally, in an embodiment of the present invention, after controlling the solenoid valve in the constant temperature and humidity unit to be turned on or off, the method further includes: acquiring air supply temperature and air supply humidity; and if the air supply temperature is in a second preset range of the set air supply temperature and the air supply humidity is in a third preset range of the set air supply humidity, controlling the constant-temperature and constant-humidity unit to operate according to the ventilation mode.
Specifically, the second preset range may be a range in which the supply air temperature is determined to be within the allowable deviation, and the third preset range may be a range in which the supply air humidity is determined to be within the allowable deviation.
In an optional scheme, when the air supply temperature is within a second preset range of the set air supply temperature and the air supply humidity is within a third preset range of the set air supply humidity, it is indicated that the system can be 0 at the moment, the unit can be controlled to enter a ventilation mode to operate, and the operation time of the ventilation mode is not less than 3 min.
It should be noted that, for the fresh air handling unit, the supply air temperature and the supply air humidity can be collected, and for the return air handling unit, the return air temperature and the return air humidity can be collected.
Example 2
According to the embodiment of the invention, the constant temperature and humidity unit is provided. The unit may execute the control method provided in embodiment 1, where the method is mainly executed by an electrical control system in the unit, and a preferred embodiment in this embodiment is described in relation to embodiment 1, and is not described herein again.
Fig. 5 is a schematic diagram of a constant temperature and humidity unit according to an embodiment of the present invention, and as shown in fig. 5, the unit includes:
a primary loop comprising: a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a first electronic expansion valve 14 and an indoor heat exchanger 15 which are connected in sequence;
a reheat circuit comprising: a reheating condenser 21 and a second electronic expansion valve 22 which are connected in sequence, wherein the second electronic expansion valve is connected with the indoor heat exchanger;
an electromagnetic valve 00 connected between the four-way valve and the reheat condenser;
a first sensor 32 for collecting indoor temperature and indoor humidity;
and a controller 31 connected to the solenoid valve and the first sensor, for controlling the solenoid valve to be turned on or off based on the indoor temperature and the indoor humidity.
Optionally, in an embodiment of the present invention, the constant temperature and humidity unit further includes: the second sensor is used for acquiring the air supply temperature and the air supply humidity; and the controller is connected with the second sensor, the second electronic expansion valve and the compressor, and is used for controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the air supply temperature and controlling the frequency of the compressor based on the indoor humidity and the air supply humidity.
Optionally, in an embodiment of the present invention, the constant temperature and humidity unit further includes: a reheat electric heater; preheating an electric heater; a humidifier; and the controller is connected with the reheating electric heater, the preheating electric heater and the humidifier and is used for controlling the reheating electric heater and the preheating electric heater to be switched on or off based on the indoor temperature and the indoor humidity and controlling the humidifier to be switched on or off based on the indoor humidity.
Optionally, in an embodiment of the present invention, the constant temperature and humidity unit further includes: the second sensor is used for collecting the air supply temperature; and the controller is connected with the second sensor and the compressor and is used for controlling the frequency of the compressor based on the indoor temperature and the air supply temperature.
Optionally, in an embodiment of the present invention, the constant temperature and humidity unit further includes: a reheat electric heater; and the controller is connected with the reheating electric heater and used for acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value if the frequency value of the compressor reaches the maximum frequency value, judging whether the indoor temperature is within a first preset range of the temperature difference value, and controlling the reheating electric heater to be conducted if the indoor temperature is not within the first preset range, wherein the first preset range is determined by the temperature control precision.
Optionally, in an embodiment of the present invention, the constant temperature and humidity unit further includes: a humidifier; and the controller is connected with the humidifier and is used for controlling the conduction of the humidifier in the constant temperature and humidity unit after the control electromagnetic valve is closed.
Example 3
According to an embodiment of the present invention, a storage medium is provided, and the storage medium includes a stored program, where when the program runs, a device in which the storage medium is located is controlled to execute the control method of the constant temperature and humidity unit in embodiment 1.
Example 4
According to an embodiment of the present invention, a processor is provided, and the processor is configured to execute a program, where the program executes the control method of the constant temperature and humidity unit in embodiment 1.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (14)

1. A control method of a constant temperature and humidity unit is characterized by comprising the following steps:
acquiring indoor temperature and indoor humidity;
controlling the electromagnetic valve in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity;
wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit including: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and the indoor heat exchanger that connects gradually, reheat circuit includes: the indoor heat exchanger comprises a reheating condenser and a second electronic expansion valve which are connected in sequence, wherein the second electronic expansion valve is connected with the indoor heat exchanger, and the electromagnetic valve is connected between the four-way valve and the reheating condenser.
2. The method of claim 1, wherein controlling on or off of a solenoid valve in the constant temperature and humidity unit based on the indoor temperature and the indoor humidity comprises:
acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value;
comparing the indoor temperature to the temperature difference and comparing the indoor humidity to the humidity difference;
if the indoor temperature is less than or equal to the temperature difference value and the indoor humidity is less than or equal to the humidity difference value, controlling the electromagnetic valve to be closed;
and if the indoor temperature is greater than the temperature difference value or the indoor humidity is greater than the humidity difference value, controlling the electromagnetic valve to be conducted.
3. The method of claim 1, wherein after controlling the solenoid valve to conduct, the method further comprises:
acquiring air supply temperature and air supply humidity;
controlling an opening degree of the second electronic expansion valve based on the indoor temperature and the supply air temperature;
controlling a frequency of the compressor based on the indoor humidity and the supply air humidity.
4. The method of claim 3, wherein controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the supply air temperature comprises:
obtaining a set air supply temperature based on the indoor temperature and a set indoor temperature;
and controlling the opening degree of the second electronic expansion valve based on the acquired air supply temperature and the set air supply temperature.
5. The method of claim 3, wherein controlling the frequency of the compressor based on the indoor humidity and the supply air humidity comprises:
obtaining a set air supply humidity based on the indoor humidity and a set indoor humidity;
and controlling the frequency of the compressor based on the acquired air supply humidity and the set air supply humidity.
6. The method of claim 3, further comprising:
controlling a reheating electric heater and a preheating electric heater in the constant temperature and humidity unit to be switched on or off based on the indoor temperature and the indoor humidity;
and controlling the humidifier in the constant temperature and humidity unit to be switched on or off based on the indoor humidity.
7. The method of claim 6, wherein controlling the reheating electric heaters and the preheating electric heaters in the constant temperature and humidity unit to be turned on or off based on the indoor temperature and the indoor humidity comprises:
acquiring the difference between the set indoor temperature and the preset heat load to obtain a temperature difference value and the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value;
when the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference and the humidity control precision, controlling the reheating electric heater to be switched on and the preheating electric heater to be switched off;
controlling the reheating electric heater and the preheating electric heater to be turned off under the condition that the indoor temperature is greater than the sum of the temperature difference value and the temperature control precision and the indoor temperature is less than or equal to the difference between the humidity difference value and the humidity control precision;
and controlling the reheating electric heater and the preheating electric heater to be conducted under the condition that the indoor temperature is less than or equal to the difference between the temperature difference value and the temperature control precision and the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision.
8. The method of claim 6, wherein controlling on or off of humidifiers in the constant temperature and humidity unit based on the indoor humidity comprises:
acquiring the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value;
controlling the humidifier to be closed under the condition that the indoor temperature is greater than the sum of the humidity difference value and the humidity control precision;
and controlling the humidifier to be conducted under the condition that the indoor temperature is less than or equal to the difference between the humidity difference value and the humidity control precision.
9. The method according to claim 1, wherein after controlling the solenoid valves in the constant temperature and humidity unit to be turned on or off, the method further comprises:
acquiring air supply temperature and air supply humidity;
and if the air supply temperature is within a second preset range of the set air supply temperature and the air supply humidity is within a third preset range of the set air supply humidity, controlling the constant-temperature and constant-humidity unit to operate according to a ventilation mode.
10. The utility model provides a constant temperature and humidity unit which characterized in that includes:
a primary loop comprising: the indoor heat exchanger comprises a compressor, a four-way valve, an outdoor heat exchanger, a first electronic expansion valve and an indoor heat exchanger which are connected in sequence;
a reheat circuit comprising: the reheating condenser and the second electronic expansion valve are sequentially connected, and the second electronic expansion valve is connected with the indoor heat exchanger;
the electromagnetic valve is connected between the four-way valve and the reheating condenser;
the first sensor is used for collecting indoor temperature and indoor humidity;
and the controller is connected with the electromagnetic valve and the first sensor and is used for controlling the electromagnetic valve to be switched on or switched off based on the indoor temperature and the indoor humidity.
11. The constant temperature and humidity unit as claimed in claim 10, further comprising:
the second sensor is used for acquiring the air supply temperature and the air supply humidity;
the controller is connected with the second sensor, the second electronic expansion valve and the compressor, and is used for controlling the opening degree of the second electronic expansion valve based on the indoor temperature and the air supply temperature and controlling the frequency of the compressor based on the indoor humidity and the air supply humidity.
12. The constant temperature and humidity unit as claimed in claim 11, further comprising:
a reheat electric heater;
preheating an electric heater;
a humidifier;
the controller is connected with the reheating electric heater, the preheating electric heater and the humidifier and used for controlling the reheating electric heater and the preheating electric heater to be switched on or switched off based on the indoor temperature and the indoor humidity and controlling the humidifier to be switched on or switched off based on the indoor humidity.
13. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, the storage medium is controlled to execute the control method of the constant temperature and humidity unit according to any one of claims 1 to 9.
14. A processor, characterized in that the processor is used for running a program, wherein the program is used for executing the control method of the constant temperature and humidity unit according to any one of claims 1 to 9.
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CN114877414A (en) * 2022-04-29 2022-08-09 广东顺景制冷科技有限公司 Box type environment-friendly energy-saving constant-temperature constant-humidity unit
CN115127221A (en) * 2022-07-07 2022-09-30 青岛海尔空调电子有限公司 Constant temperature and humidity air conditioning system and control method thereof

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GB745151A (en) * 1952-09-06 1956-02-22 Carrier Engineering Co Ltd Improvements in or relating to air conditioning apparatus
CN103925668A (en) * 2014-04-28 2014-07-16 上海理工大学 Direct-current frequency conversion constant-temperature and humidity set achieving condensation heat recovery and heat and humidity separation control method
KR101540221B1 (en) * 2015-03-12 2015-07-30 주식회사 에이알 Thermo-hygrostat and its controll method using absolute humidity
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CN114877414A (en) * 2022-04-29 2022-08-09 广东顺景制冷科技有限公司 Box type environment-friendly energy-saving constant-temperature constant-humidity unit
CN115127221A (en) * 2022-07-07 2022-09-30 青岛海尔空调电子有限公司 Constant temperature and humidity air conditioning system and control method thereof

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