CN112902486B - 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
CN112902486B
CN112902486B CN201911222468.4A CN201911222468A CN112902486B CN 112902486 B CN112902486 B CN 112902486B CN 201911222468 A CN201911222468 A CN 201911222468A CN 112902486 B CN112902486 B CN 112902486B
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humidity
temperature
indoor
difference
controlling
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CN112902486A (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; based on the indoor temperature and the indoor humidity, controlling the electromagnetic valve in the constant temperature and humidity unit to be turned on or turned off; wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit comprising: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and indoor heat exchanger that connect gradually, reheat circuit includes: the reheating condenser and the second electronic expansion valve are connected in sequence, 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. 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 mixture of fresh air and return air, and then carries out dew point temperature control and reheating control through cooling and dehumidification treatment. The reheating device is mostly made of resistance wires or PTC (Positive Temperature Coefficient ) semiconductor ceramics, and the reheating device consumes high-energy-grade electric energy, is poor in economical efficiency and has the risk of fire caused by temperature runaway.
The existing fresh air constant temperature or constant temperature and humidity unit is characterized in that the fresh air working condition is treated, the refrigerating capacity and the heat exchanger are often 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 small during transition seasons, and in addition, the dynamic change trend of fresh air exists, the control system often cannot control the loading and unloading of the compressor well, and the vapor compression system is easily protected, so that a user cannot normally use the unit.
In view of the above problems, no effective solution has been proposed at present.
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 embodiment of the invention, there is provided a control method of a constant temperature and humidity unit, including: acquiring indoor temperature and indoor humidity; based on the indoor temperature and the indoor humidity, controlling the electromagnetic valve in the constant temperature and humidity unit to be turned on or turned off; wherein, constant temperature and humidity unit includes: a main circuit and a reheat circuit, the main circuit comprising: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and indoor heat exchanger that connect gradually, reheat circuit includes: the reheating condenser and the second electronic expansion valve are connected in sequence, 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.
Further, controlling the solenoid valve in the constant temperature and humidity unit to be turned on or off based on the indoor temperature and the indoor humidity includes: obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining 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 value, and comparing the indoor humidity with the humidity difference value; 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, 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 controlling the solenoid valve to conduct, the method further comprises: acquiring air supply temperature and air supply humidity; controlling the opening 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 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 obtained 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 supply air humidity based on the indoor humidity and the set indoor humidity; and controlling the frequency of the compressor based on the obtained air supply humidity and the set air supply humidity.
Further, the method further comprises: based on the indoor temperature and the indoor humidity, controlling a reheat electric heater and a preheating electric heater in the constant temperature and humidity unit to be turned on or turned off; and controlling a humidifier in the constant temperature and humidity unit to be turned on or turned off based on the indoor humidity.
Further, based on the indoor temperature and the indoor humidity, controlling the on or off of the reheat electric heater and the preheat electric heater in the constant temperature and humidity unit includes: obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; controlling the conduction of the reheating electric heater and closing the preheating electric heater under the condition that the indoor temperature is larger than the sum of the temperature difference value and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference value and the humidity control precision; controlling the reheat electric heater and the preheat electric heater to be turned off under the condition that the indoor temperature is larger than the sum of the temperature difference and the temperature control precision and the indoor humidity is smaller than or equal to the difference between the humidity difference and the humidity control precision; and controlling the conduction of the reheating electric heater and the preheating electric heater under the condition that the indoor temperature is smaller than or equal to the difference between the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision.
Further, controlling the humidifier in the constant temperature and humidity unit to be turned on or off based on the indoor humidity includes: obtaining the difference between the humidity in the set room and the preset humidity load to obtain a humidity difference value; controlling the humidifier to be closed under the condition that the indoor humidity is larger 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 humidity is smaller than or equal to the difference between the humidity difference value and the humidity control precision.
Further, after controlling the solenoid valve to close, 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.
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; 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 in a first preset range of a temperature difference value, wherein the first preset range is determined by temperature control precision; and if the indoor temperature is not in the first preset range, controlling the conduction of a reheating electric heater in the constant temperature and humidity unit.
Further, after the control electromagnetic valve is closed, a humidifier in the constant temperature and humidity unit is controlled to be conducted.
Further, after controlling the electromagnetic valve in the constant temperature and humidity unit 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 humidity unit to operate according to the ventilation mode.
According to another aspect of the embodiment of the present invention, there is also provided a constant temperature and humidity unit including: a primary loop, comprising: the compressor, the four-way valve, the outdoor heat exchanger, the first electronic expansion valve and the indoor heat exchanger are sequentially connected; a reheat circuit comprising: the reheating condenser and the second electronic expansion valve are connected in sequence, 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 turned on or turned off based on the indoor temperature and the indoor humidity.
Further, the constant temperature and humidity unit further includes: the second sensor is used for collecting 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, 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 on or off of the reheating electric heater and the preheating electric heater based on the indoor temperature and the indoor humidity and controlling the on or off of the humidifier based on the indoor humidity.
Further, 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.
Further, the constant temperature and humidity unit further includes: a reheat electric heater; and the controller is connected with the reheating electric heater and is 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 in a first preset range of the temperature difference value, and controlling the reheating electric heater to be turned on if the indoor temperature is not in the first preset range, wherein the first preset range is determined by the temperature control precision.
Further, the constant temperature and humidity unit further includes: a humidifier; and the controller is connected with the humidifier and used for controlling the connection of the humidifier in the constant temperature and humidity unit after the electromagnetic valve is controlled to be closed.
According to another aspect of the embodiment of the present invention, there is further provided a storage medium, where the storage medium includes a stored program, and when the program runs, the device where the storage medium is controlled to execute the control method of the constant temperature and humidity unit described above.
According to another aspect of the embodiment of the invention, a processor is further provided, and the processor is used for running a program, wherein the control method of the constant temperature and humidity unit is executed when the program runs.
In the embodiment of the invention, after the indoor temperature and the indoor humidity are acquired, the electromagnetic valve connecting the main loop and the reheating loop can be controlled to be turned on or off based on the acquired data, so that the connection and disconnection of the reheating condenser are realized. Compared with the prior art, the reheating condenser is used for replacing a traditional reheating device for directly heating by using electric energy, the condensing heat carried by high-temperature refrigerant steam discharged by the compressor is used as a reheating heat source of the unit, and the temperature of the air outlet of the unit can be ensured to be at a target value of a control system without consuming additional electric energy. In winter that need not cool down dehumidification, on the contrary need the heating up humidification, refrigerating system passes through the cross valve and switches the refrigerant flow direction, absorbs the heat in the outdoor air and as the heat supply source, has realized refrigerating system heat pump heating's function, and theoretical cyclic energy efficiency ratio is constantly more than 1, under the circumstances that provides same heat, consumes the electric energy less, and make full use of the equipment in the unit moreover, reached the effect that reduces the electric energy consumption, improves resource utilization, and then solved among the correlation technique constant temperature and humidity unit energy consumption more, resource utilization ratio lower technical problem.
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 embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart 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 assembly according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative control system for a constant temperature and humidity assembly 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 present 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 one-way valve 1; 2. a one-way valve 2; 3. a one-way valve 3; 4. a one-way valve 4; 21. a reheat condenser; 22. a secondary electronic expansion valve; 31. a controller; 32. a sensor; 33. a humidifier; 34. a reheat electric heater; 35. preheating an electric heater; 36. a blower.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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 control method of a constant temperature and humidity unit, it should be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and although a logic sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown herein.
Fig. 1 is a flowchart of a control method of a constant temperature and humidity unit according to an embodiment of the present invention, as shown in fig. 1, the method includes the steps of:
step S102, acquiring the indoor temperature and the indoor humidity.
Specifically, the indoor temperature and the indoor humidity can be acquired through a sensor which is arranged by 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 conducted or closed 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 comprising: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and indoor heat exchanger that connect gradually, reheat circuit includes: the reheating condenser and the second electronic expansion valve are connected in sequence, 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.
Specifically, the constant temperature and humidity unit is divided from the unit modules, and may include an indoor unit for processing the temperature and humidity of indoor air and an outdoor unit for exchanging energy with outdoor environment; divided from the functional implementation modules, may include vapor compression refrigeration systems, electrical control systems, and air handling systems. The components of the refrigeration system and the electrical control system exist in the indoor unit and the outdoor unit, and in the embodiment of the invention, the positions of certain components are not specified.
The refrigerating system mainly comprises a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger and a reheat condenser which are connected in a certain sequence through copper pipes to form a circulating system. As shown in fig. 2, in an alternative scheme, two loops are separated from the exhaust port of the compressor 11, a main loop and a condensate reheat loop of the refrigeration cycle are connected with a reheat condenser 21 of the indoor unit through an electromagnetic valve 00, and are converged with the main loop through a secondary electronic expansion valve 22 (namely, the second electronic expansion valve) to enter the indoor heat exchanger 15, a four-way valve 12 of the main loop is respectively connected with the exhaust port of the compressor 11, the air suction port of the compressor 11, the 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 valve 12, and a liquid reservoir 17, a main electronic expansion valve 14 (namely, the first electronic expansion valve) and four check valves 1-4 arranged for ensuring that the refrigerant flows unidirectionally through the liquid reservoir 17 and the main electronic expansion valve 14 are arranged between the outdoor heat exchanger 13 and the indoor heat exchanger 15.
The electric control system mainly comprises a transmitter, a regulator, an actuator and the like, and is connected through a cable to form a control system. As shown in fig. 3, the constant temperature and humidity unit further includes: the device 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 is used for collecting the temperature heated by the preheating electric heater 35, and the other sensor 32 is arranged at an air supply port 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, which are connected by 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 acquired by the sensor, and provides an HMI (human-machine interface, human Machine Interface) for a user. The external machine control system comprises an external machine controller, a main electronic expansion valve, an external fan, a four-way valve and a gas-liquid separator, wherein the external machine controller can control the data acquired by a sensor and control the frequency of a compressor through a variable frequency driver, and the external machine controller is connected with the variable frequency driver through a communication link.
In an alternative scheme, when the indoor temperature or the indoor humidity is high, the unit can be controlled to enter a refrigerating and dehumidifying mode, at the moment, the flow direction of the refrigerant is switched through the four-way valve, so that the outdoor heat exchanger is used as an evaporator, heat is absorbed from the outdoor environment, the indoor heat exchanger is used as a condenser, heat is released to the indoor environment, and the traditional heating device for directly generating heat by electric energy is reduced or canceled. When the indoor temperature and humidity are lower, the unit can be controlled to enter a heating and humidifying mode, and at the moment, the condensing and reheating loop is switched by the electromagnetic valve and does not participate in circulation.
In the refrigeration and dehumidification mode, a low-temperature low-pressure two-phase refrigerant is commonly input by the main/auxiliary electronic expansion valve, and the superheat degree of the refrigerant at the outlet of the indoor heat exchanger is controlled by the main electronic expansion valve.
According to the embodiment of the invention, after the indoor temperature and the indoor humidity are acquired, the electromagnetic valve connecting the main loop and the reheating loop can be controlled to be turned on or off based on the acquired data, so that the connection and disconnection of the reheating condenser are realized. Compared with the prior art, the reheating condenser is used for replacing a traditional reheating device for directly heating by using electric energy, the condensing heat carried by high-temperature refrigerant steam discharged by the compressor is used as a reheating heat source of the unit, and the temperature of the air outlet of the unit can be ensured to be at a target value of a control system without consuming additional electric energy. In winter that need not cool down dehumidification, on the contrary need the heating up humidification, refrigerating system passes through the cross valve and switches the refrigerant flow direction, absorbs the heat in the outdoor air and as the heat supply source, has realized refrigerating system heat pump heating's function, and theoretical cyclic energy efficiency ratio is constantly more than 1, under the circumstances that provides same heat, consumes the electric energy less, and make full use of the equipment in the unit moreover, reached the effect that reduces the electric energy consumption, improves resource utilization, and then solved among the correlation technique constant temperature and humidity unit energy consumption more, resource utilization ratio lower technical problem.
Optionally, in an embodiment of the present invention, controlling the electromagnetic valve in the constant temperature and humidity unit to be turned on or off based on the indoor temperature and the indoor humidity includes: obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining 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 value, and comparing the indoor humidity with the humidity difference value; 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, 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 temperatures and humidities that the constant temperature and humidity unit needs to reach, where the set indoor temperature is denoted by Ts, and the set indoor humidity is denoted by ds. The preset heat load may be a preset unit temperature rise and a room heat load, denoted by a, and may be set to 2-10, and in the embodiment of the present invention, 6 is illustrated as an example. The preset wet load may be a preset room wet load, denoted by b, and may be set to 0-5, which is illustrated by way of example as 2 in the embodiment of the present invention.
In the embodiment of the application, the constant temperature and humidity unit mainly adopts full fresh air control, and the control system selects a corresponding operation mode according to the fresh air working condition. In an alternative 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 unit is controlled to enter a heating and humidifying mode, at the moment, the electromagnetic valve is closed, and the condensing and reheating loop is switched by the electromagnetic valve and does not participate in circulation; otherwise, the control unit enters 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 refrigeration and dehumidification mode, in the main circuit part, high-temperature and high-pressure refrigerant vapor discharged by the compressor 11 firstly passes through the oil separator 18, 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 released into medium-temperature and high-pressure liquid refrigerant, enters the liquid storage 17 through the one-way valve 1, then is throttled and depressurized into low-temperature and low-pressure gas-liquid two-phase refrigerant through the main electronic expansion valve 14, 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 16 through the four-way valve 12 to separate out possible liquid, and all the gaseous refrigerant returns to the compressor 11. And in the condensed reheating loop part, the other part of high-temperature high-pressure refrigerant steam discharged by the oil separator 18 enters a reheating condenser 21, heats air cooled and dehumidified by the indoor heat exchanger 15, then condenses into a medium-temperature high-pressure liquid refrigerant, throttles and reduces pressure by the auxiliary electronic expansion valve 22 to be combined with the main loop refrigerant, enters the indoor heat exchanger 15, and returns to the compressor 11 until the air is circularly reciprocated.
In another alternative, as indicated by the dashed arrows in fig. 2 and 3, in the heating and humidification mode, the condensed reheat circuit does not participate in the cycle, and the solenoid valve 00 is closed to shut off communication with the main circuit. In the main loop part, high-temperature and high-pressure refrigerant vapor discharged by the compressor 11 firstly passes through the oil separator 18, enters the indoor heat exchanger 15 through the four-way valve 12 to be condensed and released into medium-temperature and high-pressure liquid refrigerant, enters the liquid storage 17 through the one-way valve 2, then enters the main electronic expansion valve 14 to be throttled and depressurized into low-temperature and low-pressure gas-liquid two-phase refrigerant, flows out of the one-way valve 4, enters the outdoor heat exchanger 13, evaporates and absorbs heat to become low-temperature and low-pressure refrigerant vapor with a certain superheat degree, enters the gas-liquid separator 16 through the four-way valve 12 to separate out possible liquid, and all gaseous refrigerant returns to the compressor 11 to be circulated and reciprocated in this way.
It should be noted that, because the fresh air condition needs to deal with the transition season, the compressor needs to run for a long time at low frequency at this moment, in order to ensure that the compressor can not lack oil, regular oil return needs to be ensured.
Optionally, in an embodiment of the present invention, after controlling the electromagnetic valve to be turned on, the method further includes: acquiring air supply temperature and air supply humidity; controlling the opening 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 serial control, that is, the electric 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 adopt the mode of direct current speed governing to adjust the gas transmission volume, makes refrigerating capacity, the heating capacity of system satisfy the precision requirement of constant temperature and humidity unit.
Specifically, the air supply temperature and the air supply humidity can be collected through a sensor which is arranged on the constant temperature and humidity unit and used for detecting the temperature and the humidity. As shown in fig. 3, the air supply temperature and the air supply humidity can be collected by a sensor 32 provided in the air supply port.
In the refrigeration and dehumidification mode, the reheat amount of the reheat condenser is determined by adjusting the liquid refrigerant in the reheat condenser through the opening degree of the auxiliary electronic expansion valve, and then the effective heat exchange area is adjusted, so that the reheat amount is controlled. In an alternative scheme, the opening degree of the auxiliary electronic expansion valve can be adjusted through the indoor temperature and the air supply temperature, and the frequency of the compressor can be adjusted through the indoor humidity and the air supply humidity.
Optionally, 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 obtained 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 energy demand, converts the cold energy demand into the rotating speed of the frequency converter, simultaneously sends a starting instruction of the compressor of the external machine to the controller of the external machine, controls and opens the steam electromagnetic valve and the liquid electromagnetic valve of the pipeline, gives an initial opening to the electronic expansion valve, and then operates the external fan and the compressor according to logic. In an alternative scheme, the collected indoor temperature and the set indoor temperature can be compared, the set air supply temperature is determined through PID (proportion-integration-differentiation) control, and after the collected air supply temperature is compared with the set air supply temperature, the opening of the auxiliary electronic expansion valve is driven through PID control, so that the air supply temperature reaches the set value, and 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 supply air humidity based on the indoor humidity and the set indoor humidity; and controlling the frequency of the compressor based on the obtained air supply humidity and the set air supply humidity.
During the operation of the refrigeration and dehumidification mode, the central controller monitors indoor humidity and dynamically adjusts the rotating speed of the frequency converter, so that the frequency of the compressor is adjusted. In an alternative scheme, the collected indoor humidity and the set indoor humidity can be compared, the set air supply humidity is determined through PID (proportion-integration-differentiation) control, the collected air supply humidity is compared with the set air supply humidity, and the frequency of the variable frequency compressor is driven through PID control to enable the air supply humidity to reach a set value, so that the indoor humidity reaches the set value.
In the cooling/dehumidifying mode, PID of temperature and humidity is calculated simultaneously, and the larger PID is outputted and is controlled preferentially.
Optionally, in an embodiment of the present invention, the method further includes: based on the indoor temperature and the indoor humidity, controlling a reheat electric heater and a preheating electric heater in the constant temperature and humidity unit to be turned on or turned off; and controlling a humidifier in the constant temperature and humidity unit to be turned on or turned off based on the indoor humidity.
In the operation process of the refrigeration and dehumidification mode, the humidity overrun can be caused by the fact that the air is supplied to the room after the temperature is directly reduced, and in an alternative scheme, the electric heater (comprising the reheating electric heater and the preheating electric heater) can be loaded or unloaded according to the change of the indoor temperature and humidity. When the indoor humidity is close to the set humidity and has a descending trend, the humidifier outputs an opening according to calculation to perform humidity compensation.
When the compressor reaches a set frequency, the reheat electric heater is turned on in a linkage manner.
Optionally, in an embodiment of the present invention, controlling the reheat electric heater and the preheat 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: obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; controlling the conduction of the reheating electric heater and closing the preheating electric heater under the condition that the indoor temperature is larger than the sum of the temperature difference value and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference value and the humidity control precision; controlling the reheat electric heater and the preheat electric heater to be turned off under the condition that the indoor temperature is larger than the sum of the temperature difference and the temperature control precision and the indoor humidity is smaller than or equal to the difference between the humidity difference and the humidity control precision; and controlling the conduction of the reheating electric heater and the preheating electric heater under the condition that the indoor temperature is smaller than or equal to the difference between the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision.
Specifically, the above-described temperature control accuracy may be represented by Δt, the humidity control accuracy may be represented by Δd, and the re-determination may be made every 3 minutes.
In an alternative, when Tx > (Ts-a) +DeltaT and dx > (ds-b) +Deltad, the inverter compressor, solenoid valve and reheat electric heater are activated and priority is given to humidity control; when Tx > (Ts-a) +DeltaT and dx is less than or equal to (ds-b) -Deltad, starting the variable frequency compressor, and giving priority to temperature control; when Tx is less than or equal to (Ts-a) -DeltaT and dx > (ds-b) +Deltad, the variable frequency compressor, the electromagnetic valve, the reheating electric heater and the preheating electric heater are started (the system is prevented from being excessively low in low pressure), and humidity control is prioritized.
Optionally, in the embodiment of the present invention, controlling on or off of the humidifier in the constant temperature and humidity unit based on the indoor humidity includes: obtaining the difference between the humidity in the set room and the preset humidity load to obtain a humidity difference value; controlling the humidifier to be closed under the condition that the indoor humidity is larger 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 humidity is smaller than or equal to the difference between the humidity difference value and the humidity control precision.
In an alternative, when dx > (ds-b) +Δd, indicating that there is no downward trend in the indoor humidity compared to the set indoor humidity, there is no need to turn on the humidifier; when dx is less than or equal to (ds-b) -delta d, starting to show that the indoor humidity is close to the set indoor humidity and the trend of the indoor humidity is reduced, and starting the humidifier to perform humidity compensation.
Optionally, in an embodiment of the present invention, after controlling the electromagnetic valve to close, 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 collected through a sensor which is arranged on the constant temperature and humidity unit and used for detecting the temperature and the humidity. As shown in fig. 3, the air supply temperature and the air supply humidity can be collected by a sensor 32 provided in the air supply port.
The heating and humidifying mode is a control strategy used when the indoor temperature and humidity are lower than the set values of users. At the moment, the central controller analyzes the actual demand of a user through an algorithm, calculates a heat demand, converts the heat demand into the rotating speed of the frequency converter, simultaneously sends a starting instruction of the compressor of the external machine to the controller of the external machine, controls and opens the steam electromagnetic valve and the liquid electromagnetic valve of the pipeline, gives an initial opening degree to the electronic expansion valve, then operates the external fan and the compressor according to logic, and switches the four-way valve to heat after the compressor operates for a period of time. The central controller monitors the load change in the room and dynamically adjusts the rotational speed of the frequency converter.
In an alternative solution, the collected indoor temperature may be compared with the set indoor temperature, the set air supply temperature is determined by PID (proportional-integral-differential) control, and after the collected air supply temperature is compared with the set air supply temperature, the frequency of the inverter compressor is driven by PID control, so that the air supply temperature reaches the set value, and 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; 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 in a first preset range of a temperature difference value, wherein the first preset range is determined by temperature control precision; and if the indoor temperature is not in the first preset range, controlling the conduction of a reheating electric heater in the constant temperature and humidity unit.
Specifically, the first preset range may be set according to the actual implementation, for example, the first preset range may be set to 0, that is, it is determined whether the indoor temperature reaches the set indoor temperature, and the first preset range may be set according to the actual fluctuation condition in consideration of the temperature fluctuation in the control process.
In an alternative, in the heating and humidifying mode, the indoor temperature still cannot reach the setting when the compressor is started to the maximum rotating speed, and at the moment, the electric heating is started again to compensate.
Optionally, in the embodiment of the invention, after the electromagnetic valve is controlled to be closed, a humidifier in the constant temperature and humidity unit is controlled to be turned on.
In an alternative scheme, in a heating and humidifying mode, the temperature of air fed into a room is high, the humidity is low, and a humidifier needs to be started to humidify in order to meet the indoor humidity.
Optionally, in an embodiment of the present invention, after controlling the electromagnetic 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 humidity unit to operate according to the ventilation mode.
Specifically, the second preset range may be a range corresponding to the allowable deviation of the air supply temperature, and the third preset range may be a range corresponding to the allowable deviation of the air supply humidity.
In an alternative scheme, when 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, the system can be indicated to be 0 at the moment, and the unit can be controlled to enter a ventilation mode to operate, and the operation time of the ventilation mode is not less than 3min.
It should be noted that, the air supply temperature and the air supply humidity can be collected for the all fresh air unit, and the return air temperature and the return air humidity can be collected for the return air unit.
Example 2
According to the embodiment of the invention, a constant temperature and humidity unit is provided. The unit may execute the control method provided in the above embodiment 1, and the method is mainly executed by an electrical control system in the unit, and the preferred embodiment in this embodiment is described in the related embodiment 1, which is not described herein.
FIG. 5 is a schematic view of a constant temperature and humidity unit according to an embodiment of the present invention, as shown in FIG. 5, the unit including:
a primary loop, comprising: the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the first electronic expansion valve 14 and the indoor heat exchanger 15 are sequentially connected;
a reheat circuit comprising: a reheat condenser 21 and a second electronic expansion valve 22 which are connected in sequence, the second electronic expansion valve being connected with the indoor heat exchanger;
a solenoid valve 00 connected between the four-way valve and the reheat condenser;
a first sensor 32 for acquiring an indoor temperature and an indoor humidity;
and a controller 31 connected with the electromagnetic valve and the first sensor for controlling the electromagnetic 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 collecting 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 on or off of the reheating electric heater and the preheating electric heater based on the indoor temperature and the indoor humidity and controlling the on or off of the humidifier 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 is 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 in a first preset range of the temperature difference value, and controlling the reheating electric heater to be turned on if the indoor temperature is not in 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 used for controlling the connection of the humidifier in the constant temperature and humidity unit after the electromagnetic valve is controlled to be closed.
Example 3
According to an embodiment of the present invention, there is provided a storage medium including a stored program, wherein the apparatus in which the storage medium is controlled to execute the control method of the constant temperature and humidity unit in embodiment 1 described above when the program runs.
Example 4
According to an embodiment of the present invention, there is provided a processor for running a program, wherein the control method of the constant temperature and humidity unit in embodiment 1 is executed when the program runs.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform 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, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (14)

1. The control method of the constant temperature and humidity unit is characterized by comprising the following steps of:
acquiring indoor temperature and indoor humidity;
controlling the electromagnetic valve in the constant temperature and humidity unit to be conducted or closed 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 comprising: compressor, cross valve, outdoor heat exchanger, first electronic expansion valve and indoor heat exchanger that connect gradually, reheat circuit includes: the reheating condenser and the second electronic expansion valve are sequentially connected, 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;
the method further comprises the steps of:
obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value;
Controlling a preheating electric heater to be turned off when the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor humidity is greater than the sum of the humidity difference and the humidity control precision, wherein the preheating electric heater is used for controlling the low pressure of the constant temperature and humidity unit;
when the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor humidity is smaller than or equal to the difference between the humidity difference and the humidity control precision, the preset electric heater is controlled to be turned off;
and controlling the preheating electric heater to be conducted under the condition that the indoor temperature is smaller than or equal to the difference between the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision.
2. The method of claim 1, wherein controlling solenoid valves in the constant temperature and humidity unit to open or close based on the indoor temperature and the indoor humidity comprises:
obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining 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 smaller than or equal to the temperature difference value and the indoor humidity is smaller than or equal to the humidity difference value, 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.
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 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 supply air humidity.
4. The method of claim 3, wherein controlling the opening 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 the set indoor temperature;
and controlling the opening degree of the second electronic expansion valve based on the obtained 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 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.
6. A method according to claim 3, characterized in that the method further comprises:
controlling a reheat electric heater in the constant temperature and humidity unit to be turned on or turned off based on the indoor temperature and the indoor humidity;
and controlling the on-off of a humidifier in the constant temperature and humidity unit based on the indoor humidity.
7. The method of claim 6, wherein controlling the reheat electric heater in the constant temperature and humidity unit to turn on or off based on the indoor temperature and the indoor humidity comprises:
obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value;
controlling the conduction of the reheating electric heater under the condition that the indoor temperature is larger than the sum of the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision;
controlling the reheating electric heater to be turned off when the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor humidity is less than or equal to the difference between the humidity difference and the humidity control precision;
And controlling the conduction of the reheating electric heater under the condition that the indoor temperature is smaller than or equal to the difference between the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision.
8. The method of claim 6, wherein controlling switching on or off a humidifier in the set of constant temperature and humidity based on the indoor humidity comprises:
obtaining the difference between the humidity in the set room and the preset humidity load to obtain a humidity difference value;
controlling the humidifier to be closed under the condition that the indoor humidity is larger 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 humidity is smaller than or equal to the difference between the humidity difference value and the humidity control precision.
9. The method of claim 1, wherein after controlling the solenoid valves in the set to be on or off, the method further comprises:
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 humidity unit to operate according to a ventilation mode.
10. A constant temperature and humidity unit, characterized by comprising:
a primary loop, comprising: the compressor, the four-way valve, the outdoor heat exchanger, the first electronic expansion valve and the indoor heat exchanger are sequentially connected;
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 preheating electric heater is used for controlling the low pressure of the constant temperature and humidity unit;
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;
the controller is connected with the preheating electric heater, the electromagnetic valve and the first sensor and is used for controlling the electromagnetic valve to be conducted or closed based on the indoor temperature and the indoor humidity; obtaining the difference between the set indoor temperature and the preset thermal load to obtain a temperature difference value, and obtaining the difference between the set indoor humidity and the preset humidity load to obtain a humidity difference value; controlling the preheating electric heater to be turned off under the condition that the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor humidity is greater than the sum of the humidity difference and the humidity control precision; when the indoor temperature is greater than the sum of the temperature difference and the temperature control precision and the indoor humidity is smaller than or equal to the difference between the humidity difference and the humidity control precision, the preset electric heater is controlled to be turned off; and controlling the preheating electric heater to be conducted under the condition that the indoor temperature is smaller than or equal to the difference between the temperature difference and the temperature control precision and the indoor humidity is larger than the sum of the humidity difference and the humidity control precision.
11. The constant temperature and humidity unit according to claim 10, further comprising:
the second sensor is used for collecting 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 according to claim 11, further comprising:
a reheat electric heater;
a humidifier;
and the controller is connected with the reheating electric heater and the humidifier and is used for controlling the on-off of the reheating electric heater based on the indoor temperature and the indoor humidity and controlling the on-off of the humidifier based on the indoor humidity.
13. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the control method of the constant temperature and humidity unit according to any one of claims 1 to 9.
14. A processor for running a program, wherein the program runs to execute 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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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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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
CN110360669A (en) * 2019-07-31 2019-10-22 苏州海派特热能设备有限公司 A kind of explosion-proof temperature and humidity control system in cool place library

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