WO2019192210A1 - Unité intérieure à température constante et humidité constante, système à température constante et humidité constante, et procédé de commande associé - Google Patents

Unité intérieure à température constante et humidité constante, système à température constante et humidité constante, et procédé de commande associé Download PDF

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WO2019192210A1
WO2019192210A1 PCT/CN2018/121530 CN2018121530W WO2019192210A1 WO 2019192210 A1 WO2019192210 A1 WO 2019192210A1 CN 2018121530 W CN2018121530 W CN 2018121530W WO 2019192210 A1 WO2019192210 A1 WO 2019192210A1
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Prior art keywords
humidity
temperature
constant temperature
evaporator
amb
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PCT/CN2018/121530
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English (en)
Chinese (zh)
Inventor
周志宾
冯志文
陈博强
戴永福
尤文超
杨瑞
周涯宸
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珠海格力电器股份有限公司
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Publication of WO2019192210A1 publication Critical patent/WO2019192210A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • 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
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements

Definitions

  • the invention relates to the technical field of constant temperature and humidity equipment, in particular to a constant temperature and humidity internal machine, a constant temperature and humidity system and a control method thereof.
  • the constant temperature and humidity machine is a kind of commercial special air conditioner.
  • the product development process has national standard restrictions, which is completely different from the constant temperature and humidity control of air conditioners or air conditioners with constant temperature and humidity function.
  • the principle of air conditioning dehumidification is to blow the wind through the evaporator with lower temperature, so that the temperature of the wind after heat exchange is lower than the dew point temperature. In this case, the water vapor part of the wind will condense into liquid water droplets.
  • air conditioners using conventional refrigerants they are generally dehumidified during cooling. To increase the dehumidification effect, the internal air volume or the evaporation temperature can be increased.
  • the air conditioning unit will generally increase the compressor frequency (increasing the compressor high and low pressure difference to reduce the system low pressure and evaporation temperature) and open the large electronic expansion valve step.
  • the method of increasing the amount of refrigerant circulation to lower the evaporation temperature is used to dehumidify.
  • the fan in the constant temperature and humidity machine generally uses an AC motor, and the rotation speed is not adjustable. Dehumidification in the case of constant air volume will lead to a result: the compressor up-conversion will lead to an increase in cooling capacity, and in the case of constant indoor load, in order to maintain constant temperature and humidity, it is necessary to turn on the electric auxiliary heat to offset the excess cooling amount, which leads to Invalid energy consumption.
  • the invention discloses a constant temperature and humidity internal machine, a constant temperature and humidity system and a control method thereof, which solves the problem that the existing constant temperature and humidity system will generate excess cooling amount due to the constant air volume during dehumidification.
  • a constant temperature and humidity internal machine comprising: a fan; a first evaporator; a second evaporator, and the second evaporator and the first evaporator are constant at the constant temperature a refrigerant compression cycle of the wet inner machine is arranged in parallel; a first electronic expansion valve is disposed in the refrigerant compression cycle of the constant temperature and humidity internal machine and is disposed in series with the first evaporator, and the first electronic expansion valve is used Controlling the flow rate of the refrigerant in the first evaporator.
  • the constant temperature and humidity internal machine further includes a return air outlet, and the first evaporator is located between the second evaporator and the return air inlet.
  • first evaporator and the second evaporator are disposed obliquely and form a V-shaped structure.
  • a constant temperature and humidity system comprising a refrigerant compression cycle and the above-described constant temperature and humidity internal combustion machine, the refrigerant compression cycle comprising: a compressor; a first heat exchange circuit, a first end Connected to the condenser, the second end of the first heat exchange circuit is in communication with the inlet of the compressor; the second heat exchange circuit is connected in parallel with the first heat exchange circuit; the constant temperature and humidity internal machine
  • the first evaporator and the first electronic expansion valve are disposed on the first heat exchange circuit, and the first electronic expansion valve is located upstream of the first evaporator; the constant temperature and humidity
  • the second evaporator of the machine is disposed on the second heat exchange circuit.
  • a control method of a constant temperature and humidity system is disclosed.
  • the constant temperature and humidity system is the above constant temperature and humidity system, and the control method includes: Step S10: acquiring an ambient temperature T ID-Amb Obtaining a set temperature T ID-Tar , acquiring an ambient humidity RH ID-Amb , acquiring a set humidity RH ID-Tar ; step S20: according to the ambient temperature T ID-Amb , the set temperature T ID-Tar , The ambient humidity RH ID-Amb and the set humidity RH ID-Tar determine whether the constant temperature and humidity system enters the dehumidification enhancement mode.
  • step S20 includes the following steps: Step S21: determining whether the ambient temperature T ID-Amb and the ambient humidity RH ID-Amb are in a preset range; step S22: when T ID-Amb ⁇ T ID- Tar +T deviation , and RH ID-Amb >RH ID-Tar , controlling the constant temperature and humidity system to enter the dehumidification enhancement mode; step S23: when T ID-Amb ⁇ T ID-Tar +T deviation +1 or RH ID -Amb ⁇ RH ID-Tar , controlling the constant temperature and humidity system to exit the dehumidification enhancement mode; wherein T deviation is temperature accuracy.
  • the compressor (9) is up-converted, and the opening degree of the first electronic expansion valve (4) is controlled to be gradually reduced.
  • the opening degree of the first electronic expansion valve (4) is controlled by the following formula:
  • EXV ID-Tar is the first electronic expansion valve target opening degree
  • EXV ID-Pnt is the current opening degree of the first electronic expansion valve
  • T ID-Amb is the indoor ambient temperature
  • T ID-Tar is the indoor set temperature.
  • the opening degree of the first electronic expansion valve is gradually increased.
  • a control method of a constant temperature and humidity system is disclosed.
  • the constant temperature and humidity system is the above constant temperature and humidity system, and the control method includes: Step S10: acquiring an ambient temperature T ID-Amb Obtaining a set temperature T ID-Tar , acquiring an ambient humidity RH ID-Amb , acquiring a set humidity RH ID-Tar , and acquiring a refrigerant inlet pipe temperature T ID-In of the second evaporator; Step S20: Ambient temperature T ID-Amb , set temperature T ID-Tar , ambient humidity RH ID-Amb , set humidity RH ID-Tar , refrigerant inlet temperature T ID of the second evaporator In , it is determined whether the constant temperature and humidity system enters the dehumidification enhancement mode.
  • step S20 includes the following steps: Step S21: determining whether the ambient temperature T ID-Amb , the ambient humidity RH ID-Amb , and the refrigerant inlet pipe temperature T ID-In are in a preset range; Step S22: When the conditions of T ID-Amb ⁇ T ID-Tar +T deviation , RH ID-Amb >RH ID-Tar , T ID-In >A are simultaneously satisfied, the constant temperature and humidity system is controlled to enter the dehumidification enhancement mode; step S23: When any of T ID-Amb ⁇ T ID-Tar + T deviation +1, RH ID-Amb ⁇ RH ID-Tar or T ID-In ⁇ B is satisfied, the constant temperature and humidity system is controlled to exit the dehumidification enhancement mode; Where T deviation is temperature accuracy, A is the preset safe temperature, and B is the preset supercooling temperature.
  • the compressor is up-converted, and the opening degree of the first electronic expansion valve is controlled to be gradually reduced.
  • the opening degree of the first electronic expansion valve (4) is controlled by the following formula:
  • the EXV ID-Tar is the target opening of the first electronic expansion valve
  • the EXV ID-Pnt is the current opening degree of the first electronic expansion valve
  • the T ID-Amb is the indoor ambient temperature
  • the T ID-Tar is the indoor set temperature.
  • the opening degree of the first electronic expansion valve is gradually increased.
  • the invention sets the two evaporators in parallel, and uses the electronic expansion valve to control the flow rate of one of the refrigerants.
  • the unit enters the dehumidification strengthening mode, wherein the first electronic expansion
  • the valve is fully closed, dehumidified by the second evaporator, and the refrigerant that has passed through the two evaporators is now only passed through the second evaporator, which causes the circulation of the refrigerant passing through the second evaporator to increase, and the heat load is constant.
  • the evaporating temperature drops, which is more conducive to dehumidification, while the first electronic expansion valve is closed, and only the second evaporator is used to complete the cooling and dehumidification.
  • This situation is equivalent to reducing the evaporation area and the air volume, and does not return because of the compressor up-conversion.
  • the refrigeration capacity is increased, thereby avoiding the situation that the constant temperature and humidity machine generates excess cooling due to the constant air volume, and the high-power electric auxiliary heat is turned on without energy saving.
  • FIG. 1 is a schematic structural view of a constant temperature and humidity internal machine according to an embodiment of the present invention
  • FIG. 2 is a working principle diagram of a constant temperature and humidity system according to an embodiment of the present invention.
  • 3 is a flow chart showing the control method of the constant temperature and humidity system according to the embodiment of the present invention.
  • FIG. 4 is a flow chart showing the control method of the constant temperature and humidity system according to another embodiment of the present invention.
  • the invention discloses a constant temperature and humidity internal machine, comprising: a fan 1, a first evaporator 2, a second evaporator 3 and a first electronic expansion valve 4.
  • the fan 1 is arranged in the air duct of the constant temperature and humidity internal machine At the tuyere; the first evaporator 2 is disposed between the fan 1 and the return air opening 6 of the air duct; the second evaporator 3 is disposed between the fan 1 and the return air opening 6, and the second evaporator 3 and the first evaporator 2
  • the first electronic expansion valve 4 is disposed in the refrigerant compression cycle of the constant temperature and humidity internal machine and is disposed in series with the first evaporator 2, and the first electronic expansion valve 4 is used The flow rate of the refrigerant in the first evaporator 2 is controlled.
  • the unit enters the dehumidification strengthening mode, wherein the first electronic expansion valve 4 Fully closed, dehumidified by the second evaporator 3, the refrigerant that originally passed through the two evaporators, now only passes through the second evaporator 3, which causes the circulation of the refrigerant passing through the second evaporator 3 to increase, and the heat load is constant It will cause the evaporation temperature to drop, which is more conducive to dehumidification, while the first electronic expansion valve 4 is closed, and only the second evaporator 3 is used to complete the cooling and dehumidification.
  • This situation is equivalent to reducing the evaporation area and the heat exchange volume, and does not return. Because the compressor is up-converted, the refrigeration capacity is increased, thereby avoiding the excess cooling capacity due to the constant air volume of the constant temperature and humidity machine, which causes the high-power electric auxiliary heat to be turned on without energy saving.
  • the cooling amount may be excessively large, and the heat generated by the electric auxiliary heat is insufficient to offset the indoor environment temperature out of control.
  • the constant temperature and humidity internal machine further includes: a second electronic expansion valve 5, the second electronic expansion valve 5 is disposed in the refrigerant compression cycle of the constant temperature and humidity internal machine and is disposed in series with the second evaporator 3,
  • the first evaporator 2 is located between the second evaporator 3 and the return air port 6, and the first evaporator 2 and the second evaporator 3 are disposed obliquely and form a V-shaped structure.
  • the unit can control the flow of the refrigerant in the evaporator through the electronic expansion valve, and only use the second evaporator 3 to dehumidify without causing The cooling capacity is increased, thereby effectively preventing the indoor temperature from being out of control or increasing the energy consumption.
  • the first evaporator 2 is located between the second evaporator 3 and the return air opening 6, and the first evaporator 2 and the second evaporator 3 form a V-shaped angle structure, the wind field distribution is adjusted, from the back.
  • the air volume and the wind speed are relatively reduced, so that the air volume and the wind force passing through the second evaporator 3 are also relatively reduced, and the decrease in the air volume is prevented. If the heat exchange rate is too large, the wind speed will be reduced to remove the condensation of water vapor in the return air, so that the constant temperature and humidity machine can not increase the excess cooling capacity while improving the dehumidification effect.
  • the constant temperature constant internal humidity machine further includes: a first electric auxiliary heat device 7 and a second electric auxiliary heat device 8, the first electric auxiliary heat device 7 is disposed between the first evaporator 2 and the fan 1; The second electric auxiliary heat device 8 is disposed between the second evaporator 3 and the blower 1.
  • the temperature can be further controlled by the electric auxiliary heat device.
  • a constant temperature and humidity system comprising a refrigerant compression cycle and the above-described constant temperature and humidity internal combustion machine, the refrigerant compression cycle comprising: a compressor 9, a first heat exchange circuit 10, and a second heat exchange In the circuit 11, the first end of the first heat exchange circuit 10 is connected to the condenser, the second end of the first heat exchange circuit 10 is in communication with the intake port of the compressor 9, and the second heat exchange circuit 11 and the first heat exchange circuit 10 in parallel; the first evaporator 2 of the constant temperature and humidity internal machine and the first electronic expansion valve 4 are disposed on the first heat exchange circuit 10, and the first electronic expansion valve 4 is located upstream of the first evaporator 2; constant temperature and humidity The second evaporator 3 of the internal machine is disposed on the second heat exchange circuit 11.
  • the indoor load is When the temperature is not high, the unit enters the dehumidification enhancement mode, in which the first electronic expansion valve 4 upstream of the first evaporator 2 is fully closed, and the second evaporator 3 is dehumidified, and the refrigerant that has passed through the two evaporators is now only from the first The second evaporator 3 passes, which causes the circulation of the refrigerant passing through the second heat exchange circuit 11 where the second evaporator 3 is located to increase.
  • a control method of a constant temperature and humidity system is disclosed.
  • the constant temperature and humidity system is the above constant temperature and humidity system, and the second heat exchange circuit 11 is provided with a second electronic expansion valve 5, and a second The electronic expansion valve 5 is used for controlling the flow rate of the refrigerant in the second evaporator 3, and the control method includes:
  • Step S10 Acquire an ambient temperature T ID-Amb , obtain a set temperature T ID-Tar , obtain an ambient humidity RH ID-Amb , and obtain a set humidity RH ID-Tar ;
  • Step S20 Determine whether the constant temperature and humidity system enters the dehumidification enhancement mode according to the ambient temperature T ID-Amb , the set temperature T ID-Tar , the ambient humidity RH ID-Amb , and the set humidity RH ID-Tar .
  • step S20 includes the following steps:
  • Step S21 determining whether the ambient temperature T ID-Amb and the ambient humidity RH ID-Amb are in a preset range
  • Step S22 When T ID-Amb ⁇ T ID-Tar +T deviation and RH ID-Amb >RH ID-Tar , controlling the constant temperature and humidity system to enter the dehumidification enhancement mode;
  • Step S23 When T ID-Amb ⁇ T ID-Tar + T deviation +1 or RH ID-Amb ⁇ RH ID-Tar , the constant temperature and humidity system is controlled to exit the dehumidification enhancement mode;
  • T deviation is temperature accuracy.
  • the compressor 9 when the constant temperature and humidity system is in the dehumidification-enhanced mode, the compressor 9 is up-converted, the opening degree of the first electronic expansion valve 4 is controlled to be gradually closed, and the opening degree of the second electronic expansion valve 5 is unchanged.
  • the opening degree of the first electronic expansion valve 4 is controlled by the following formula:
  • EXV ID-Tar is the target opening of the electronic expansion valve
  • EXV ID-Pnt is the current opening of the electronic expansion valve
  • T ID-Amb is the indoor ambient temperature
  • T ID-Tar is the indoor set temperature.
  • the opening degree of the first electronic expansion valve 4 is gradually increased, and the opening degree of the second electronic expansion valve 5 is unchanged.
  • the evaporation temperature is lowered, which is more favorable for dehumidification, and at the same time, since the first electronic expansion valve 4 is closed, only the second evaporator 3 performs cooling and dehumidification, which is equivalent to reducing the heat exchange area and the air volume. Therefore, the increase in the refrigeration capacity due to the up-conversion of the compressor is avoided, and the situation in which the high-power electric auxiliary heat is turned on is not effectively avoided.
  • the first electronic expansion valve 4 Since the first electronic expansion valve 4 is closed in the dehumidification-enhanced mode, the amount of refrigerant circulation through the other second evaporator 3 is increased, and the refrigerant inlet temperature of the second evaporator 3 is lowered on the original basis, when the second evaporation
  • the evaporator When the temperature of the refrigerant inlet pipe is lower than -1 °C, the evaporator will not evaporate completely under the condition that the indoor heat load is constant, resulting in a large amount of liquid return to the compressor, and the general constant temperature and humidity system is provided with anti-freeze protection, not only This results in reduced cooling efficiency and unstable system operation.
  • the embodiment discloses a control method for a constant temperature and humidity system.
  • the constant temperature and humidity system is the above constant temperature and humidity system
  • the second heat exchange circuit 11 is provided with a second electronic expansion valve 5 for controlling the flow rate of the refrigerant in the second evaporator 3, a refrigerant sensor 12 disposed on the refrigerant inlet line of the second evaporator 3, and a temperature sensor 12 for acquiring The refrigerant inlet temperature of the second evaporator 3,
  • the control method includes:
  • Step S10 Acquire ambient temperature T ID-Amb , obtain set temperature T ID-Tar , acquire ambient humidity RH ID-Amb , acquire set humidity RH ID-Tar , and obtain refrigerant inlet temperature T ID of second evaporator 3. -In ;
  • Step S20 determining whether the constant temperature and humidity system enters according to the ambient temperature T ID-Amb , the set temperature T ID-Tar , the ambient humidity RH ID-Amb , the set humidity RH ID-Tar , and the refrigerant inlet temperature T ID-In Dehumidification enhancement mode.
  • step S20 includes the following steps:
  • Step S21 determining whether the ambient temperature T ID-Amb , the ambient humidity RH ID-Amb , and the refrigerant inlet temperature T ID-In are in a preset range;
  • Step S22 When the conditions of T ID-Amb ⁇ T ID-Tar +T deviation , RH ID-Amb >RH ID-Tar and T ID-In >A are simultaneously satisfied, the constant temperature and humidity system is controlled to enter the dehumidification strengthening mode;
  • Step S23 When T ID-Amb ⁇ T ID-Tar +T deviation +1 ⁇ T ID-Amb ⁇ T ID -Tar +T deviation +1, RH ID-Amb ⁇ RH ID-Tar or T ID-In ⁇ is satisfied In any of the conditions B, the constant temperature and humidity system is controlled to exit the dehumidification enhancement mode;
  • T deviation is temperature accuracy, generally 0.5 ° C
  • A is the preset safe temperature
  • B is the preset supercooling temperature
  • A has a value ranging from 3 ° C to 5 ° C.
  • B has a value ranging from 1 ° C to 3 ° C.
  • step S22 when the constant temperature and humidity system is in the dehumidification-enhanced mode, the operating frequency of the compressor 9 is gradually increased, and the opening degree of the first electronic expansion valve 4 is gradually closed, and the second electronic expansion valve is gradually closed.
  • the opening of 5 is unchanged.
  • the opening degree of the first electronic expansion valve 4 is controlled by the following formula:
  • the EXV ID-Tar is the target opening of the first electronic expansion valve
  • the EXV ID-Pnt is the current opening degree of the first electronic expansion valve
  • the T ID-Amb is the indoor ambient temperature
  • the T ID-Tar is the indoor set temperature.
  • step S23 when the constant temperature and humidity control system exits the dehumidification enhancement mode, the opening degree of the first electronic expansion valve 4 gradually increases to normal, and the opening degree of the second electronic expansion valve 5 does not change.
  • the refrigeration capacity is increased by avoiding the frequency increase of the compressor, and the situation that the high-power electric auxiliary heat is turned on is not effectively avoided.
  • the temperature sensor is disposed on the inlet pipe of the second evaporator 3, by detecting the inlet temperature of the second evaporator and using it as a control condition, it is possible to prevent the anti-freeze protection from being entered due to entering the dehumidification strengthening mode, and the dehumidification is improved. The ability to ensure the reliability of the system at the same time.

Abstract

L'invention concerne une unité intérieure à température constante et humidité constante, un système à température constante et humidité constante, et un procédé de commande associé, l'unité intérieure à température constante et humidité constante comprenant : un ventilateur (1) ; un premier évaporateur (2) ; un second évaporateur (3), le second évaporateur (3) et le premier évaporateur (2) étant disposés en parallèle dans un cycle de compression de fluide frigorigène de l'unité intérieure à température constante et humidité constante ; et une première vanne d'expansion électronique (4) qui est disposée dans le cycle de compression de fluide frigorigène de l'unité intérieure à température constante et humidité constante et qui est disposée en série avec le premier évaporateur (2), la première vanne d'expansion électronique (4) étant utilisée pour réguler le débit d'un fluide frigorigène dans le premier évaporateur (2). Au moyen de l'agencement de deux évaporateurs en parallèle, la première vanne d'expansion électronique (4) étant complètement fermée et la déshumidification étant effectuée par le second évaporateur (3), une augmentation de fréquence d'un compresseur (9) est évitée, ce qui entraîne une augmentation de la capacité de refroidissement, évitant ainsi efficacement des circonstances dans lesquelles la chaleur auxiliaire électrique à haute puissance est mise sous tension et l'énergie n'est pas conservée.
PCT/CN2018/121530 2018-04-04 2018-12-17 Unité intérieure à température constante et humidité constante, système à température constante et humidité constante, et procédé de commande associé WO2019192210A1 (fr)

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