CN110822635A - Dynamic control method of electronic expansion valve during refrigeration of capillary radiation air conditioner - Google Patents

Dynamic control method of electronic expansion valve during refrigeration of capillary radiation air conditioner Download PDF

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CN110822635A
CN110822635A CN201910916778.XA CN201910916778A CN110822635A CN 110822635 A CN110822635 A CN 110822635A CN 201910916778 A CN201910916778 A CN 201910916778A CN 110822635 A CN110822635 A CN 110822635A
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temperature
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indoor unit
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CN110822635B (en
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涂虬
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Ningbo University of Technology
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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
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor 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
    • F24F11/70—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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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

Abstract

The invention discloses a dynamic control method of electronic expansion valves during refrigeration of a capillary radiation air conditioner, which comprises the steps of formulating dynamic reference control targets of all capillary electronic expansion valves according to the temperature difference between the ambient temperature and the indoor temperature, and carrying out self-learning to dynamically adjust the superheat control targets by combining the exhaust temperature or superheat degree (representing reliability) of a compressor, the temperature of a capillary coil of each starting indoor unit (representing refrigeration effect) and the temperature difference between the average temperature of the capillary coil and the temperature of each capillary coil (representing consistency of refrigeration effect). Furthermore, in order to prevent condensation in each room, self-learning self-adaptive control for condensation prevention is established, the indoor temperature of the corresponding room is ensured to be higher than the dew point temperature, and condensation prevention of each indoor unit is ensured. The invention can realize good refrigeration effect and the refrigeration consistency of each capillary tube, ensure the operation reliability of the compressor and solve the problem of indoor refrigeration condensation.

Description

Dynamic control method of electronic expansion valve during refrigeration of capillary radiation air conditioner
Technical Field
The invention relates to an air conditioner, in particular to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner.
Background
With the development of economy and the continuous improvement of living standard, the air-conditioning heating system is increasingly widely used, so that the energy consumption of buildings is huge. In the global range, the building energy consumption of developed countries accounts for about 37-40% of the total social energy consumption, the building energy consumption of China accounts for more than 33% of the total social energy consumption, the air-conditioning and heating equipment energy consumption accounts for the largest proportion and is as high as more than 65% of the total social energy consumption, and the air-conditioning dissipates a large amount of heat into the air in summer, so that the urban heat island effect is aggravated. On the other hand, people put forward higher requirements on the comfort and the health of living environment, the traditional air conditioner can not meet the requirements on energy conservation, environmental protection, comfort and health, the energy-saving and environment-friendly heat pump is researched and developed through technical innovation to replace the traditional air conditioner and heating equipment, and the capillary radiation air conditioner is produced at any time.
The capillary radiation air conditioner is a heating and cooling device which utilizes heat radiation to transfer heat, and adopts capillary radiation heat exchange to eliminate indoor sensible heat load and adopts a dehumidification mode to eliminate indoor latent heat load, thereby realizing independent temperature and humidity control of indoor environment.
The existing capillary tube radiation air conditioner can be divided into a capillary tube radiation air conditioner taking water as a medium and a dry capillary tube radiation air conditioner taking a refrigerant as a medium, wherein the capillary tube radiation air conditioner has secondary heat exchange in the heat transfer process, namely a heat pump system heat exchanger generates hot water or cold water, and then carries out secondary heat exchange with water on a water supply side, and finally enters a radiator or a capillary tube on a user side, so that the energy efficiency is low, the user experience is poor, water leakage is easy to occur when the engineering installation is poor, in addition, the risk of freezing damage of a water pipe exists in the use process in winter, rooms and articles are damaged, particularly floor heating needs to be disassembled for floor maintenance, and the maintenance is extremely inconvenient; the latter has no problems, so the advantages are obvious and the market prospect is very wide.
However, the existing dry capillary radiation air conditioner has the problem of easy condensation during cooling in summer, and the long-term use of the air conditioner can damage floors, ceilings and the like, so that the problem of condensation is the key of the existing dry capillary radiation air conditioner.
Disclosure of Invention
The invention provides a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, which is characterized in that according to the temperature of a capillary coil of each startup indoor unit and the change of the humidity of a corresponding room, the dynamic control of self adaptation and the self learning and revising function strategies according to the using environment of the capillary radiation air conditioner are simultaneously assisted, and the electronic expansion valve of each startup indoor unit is independently and dynamically adjusted in real time, so that the automatic adjustment of the temperature of the capillary coil of each startup indoor unit is realized, the consistency of the refrigeration effect of each startup indoor unit is further realized, the indoor temperature of the corresponding room is ensured to be higher than the dew point temperature, the dew condensation problem of each indoor unit is ensured, and the dew condensation problem of the capillary radiation air conditioner is effectively solved.
In order to solve the technical problems, the technical scheme of the invention is to provide a dynamic control method of an electronic expansion valve during capillary radiation air-conditioning refrigeration, which comprises the following steps:
in the process of refrigerating operation, the opening degree of the indoor electronic expansion valve of each starting indoor unit is adjusted to ensure that the superheat degree delta T of any starting indoor unitiApproaching to the reference target superheat delta T of the corresponding indoor unittar，
Wherein, the reference target superheat degree delta T of any one startup indoor unittarThe expression formula of (a) is:
ΔTtar＝ΔTset+ΔTTd+ΔTavg(2)；
in the formula (2), Δ TsetAs a reference superheat, Δ TTdAccording to the exhaust temperature T of the DC frequency conversion compressordOr the exhaust superheat of a DC inverter compressorDegree Delta TdThe first corrected superheat, Δ T, obtainedavgThe second corrected superheat degree is obtained according to the inconsistency of the refrigeration effect of the starting indoor units.
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the superheat degree delta T of any starting indoor unitiThe expression formula of (a) is:
ΔTi＝Ts-Tg,i(1)；
in the formula (1), TsIs the suction temperature, T, of the DC variable frequency compressor 1g,iThe temperature of the refrigerant at the outlet end of the capillary tube coil 21 of the respective indoor unit.
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the reference superheat degree delta TsetTaking values according to the following conditions:
when the temperature is less than or equal to 1 ℃ and T is less than or equal toa,i-TsetAt < 3 ℃, Δ Tset＝X+6℃；
When the temperature is less than or equal to 3 ℃ Ta,i-TsetAt < 5 ℃, Δ Tset＝X+5℃；
When the temperature is less than or equal to 5 ℃ and T is less than or equal toa,i-TsetAt < 7 ℃, Δ Tset＝X+4℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 9 ℃ Ta,i-TsetAt < 11 ℃, Δ Tset＝X+2℃；
When the temperature is less than or equal to 11 ℃ and T is less than or equal toa,i-TsetAt < 13 ℃ Δ Tset＝X+1℃；
When T isa,i-TsetAt a temperature of not less than 13 ℃ and a delta Tset＝X℃；
Wherein, Ta,iFor the indoor ambient temperature, T, at which the corresponding indoor unit is turned onsetTarget indoor temperature of the corresponding room set for the user, and Ta,i＞TsetAnd X is a preset constant temperature value.
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the superheat degree delta T is corrected firstlyTdTaking values according to the following conditions:
at regular intervals t2Detecting exhaust temperature T of DC variable frequency compressordAnd the exhaust superheat degree delta T of the direct current frequency conversion compressord，
When the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot less than T1Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot less than T2Then the delta T after the detectionTdΔ T to be determined after a previous testTdSubtracting 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot more than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot more than T4Then the delta T after the detectionTdΔ T to be determined after a previous testTdAdding 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondBetween T3And T1Exhaust superheat degree delta T of intermediate or direct current frequency conversion compressordBetween T4And T2When the time is longer, the delta T after the detection is carried outTdMaintaining a Δ T determined after a previous testTdThe same;
wherein, T1、T2、T3And T4Are all preset constant temperature values, and T1＞T3，T2＞T4。
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the superheat degree delta T is corrected secondlyavgTaking values according to the following conditions:
at regular intervals t2Detecting temperature T of outlet end of capillary tube coil of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coils of all the indoor units of the starting machine
Figure BDA0002216330400000031
When in use
Figure BDA0002216330400000032
Time, delta T after this detectionavgΔ T to be determined after a previous testavgSubtracting 1 ℃ on the basis;
when in use
Figure BDA0002216330400000033
Time, delta T after this detectionavgΔ T to be determined after a previous testavgAdding 1 ℃ on the basis;
when in use
Figure BDA0002216330400000034
Time, delta T after this detectionavgMaintaining a Δ T determined after a previous testavgThe same;
wherein, T5And T6Are all preset constant temperature values, and T5＞0＞T6。
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the superheat degree delta T of a reference target istarWhen the value of (A) is dynamically controlled, the superheat degree delta T of a reference target is addedtarThe self-learning and revising functions of the values are as follows:
when any one indoor unit is started up, Ta,i-Tdew,i＜T7When the temperature of the water is higher than the set temperature,
revised reference target superheat degree delta T of any starting indoor unittarThe expression of' is:
ΔTtar'＝ΔTset+ΔTTd+ΔTavg+ΔTdew(4)；
in the formula (4), Δ TdewA third corrected superheat degree for the preset dew condensation prevention;
when any one indoor unit is started up, Ta,i-Tdew,i≥T8When it is not in opposition to each otherReference target superheat degree delta T of indoor unit to be startedtarRevising;
wherein, Ta,iFor the indoor ambient temperature, T, at which the corresponding indoor unit is turned ondew,iFor corresponding dew point temperature, T, of the indoor unit of the machine7And T8Are all preset constant temperature values.
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the dew point temperature T of any starting indoor unitdew,iThe expression formula of (a) is:
Tdew,i＝Tsq-b(Ta,i-Tsq) (5)；
in the formula (5), TsqThe indoor environment humidity of the corresponding starting indoor unit; coefficient b is according to indoor ambient temperature T of corresponding starting indoor unita,iTake a value, and Ta,iThe higher the value, the smaller the value of coefficient b, specifically:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toa,iB is 1.5 when the temperature is less than or equal to 5 ℃;
when the temperature is lower than 5 DEG Ca,iB is 1.2 when the temperature is less than or equal to 10 ℃;
when 10 ℃ is less than Ta,iB is 0.8 when the temperature is less than or equal to 20 ℃;
when 20 ℃ is less than Ta,iB is 0.5 when the temperature is less than or equal to 30 ℃;
when the temperature is less than 30 DEG Ca,iB is 0.4 at the temperature of less than or equal to 40 ℃.
The invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein,
when any one indoor unit is started up, Ta,i-Tdew,i＜T7In time, the degree of superheat Δ T needs to be corrected for the firstTdAnd a second corrected degree of superheat DeltaTavgThe value condition of (a) is revised as follows:
revised first corrected superheat degree Δ TTd' values are taken according to the following conditions:
at regular intervals t2Detecting exhaust temperature T of DC variable frequency compressordAnd the exhaust superheat degree delta T of the direct current frequency conversion compressord，
When the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondGreater than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordGreater than T4Then the delta T after the detectionTd' maintenance of Δ T determined after previous testTd' same;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot more than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot more than T4Then the delta T after the detectionTd' Delta T to be determined after previous testTd' plus 1 ℃ on a basis;
revised second corrected degree of superheat Δ Tavg' values are taken according to the following conditions:
at regular intervals t2Detecting temperature T of outlet end of capillary tube coil of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coils of all the indoor units of the starting machine
Figure BDA0002216330400000051
When in use
Figure BDA0002216330400000052
Time, delta T after this detectionavg' maintenance of Δ T determined after previous testavg' same;
when in use
Figure BDA0002216330400000053
Time, delta T after this detectionavg' Delta T to be determined after previous testavg' plus 1 ℃ on a basis;
at this time, the revised reference target superheat degree Δ T of any one of the turned-on indoor units is again obtainedtar"is expressed as:
ΔTtar”＝ΔTset+ΔTTd'+ΔTavg'+ΔTdew(6)。
the capillary tube radiation air conditioner of the invention expands electronically when refrigeratingDynamic control method of valve, wherein the reference target superheat degree delta T of any one starting indoor unittarThe conditions are satisfied:
0℃≤ΔTtar≤10℃；
the invention relates to a dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner, wherein the superheat degree delta T of a first correction isTdAnd a second corrected degree of superheat DeltaTavgIs taken to be at a period t of starting of the direct current frequency conversion compressor1And then opened.
After the method is adopted, compared with the prior art, the dynamic control method of the electronic expansion valve during the refrigeration of the capillary radiation air conditioner has the following advantages: according to the invention, according to the temperature of the capillary tube coil of each starting-up indoor unit and the change of the corresponding room humidity, the self-adaptive dynamic control and the self-learning and revising function strategies according to the using environment of the capillary tube radiation air conditioner are simultaneously assisted, and the electronic expansion valves of each starting-up indoor unit are independently and dynamically adjusted in real time, so that the automatic adjustment of the temperature of the capillary tube coil of each starting-up indoor unit is realized, the consistency of the refrigeration effect of each starting-up indoor unit is further realized, the indoor temperature of the corresponding room is ensured to be higher than the dew point temperature, the dew condensation of each indoor unit is ensured, and the dew condensation problem of the capillary tube radiation air conditioner is effectively solved.
Drawings
FIG. 1 is a schematic diagram of the system of the air conditioner related to the dynamic control method of the electronic expansion valve in the refrigeration of the capillary radiation air conditioner of the present invention;
fig. 2 is a diagram showing the correspondence between the difference between the indoor ambient temperature at which the corresponding indoor unit is turned on and the target indoor temperature set by the user and the reference superheat degree in the dynamic control method for the electronic expansion valve during refrigeration in the capillary radiation air conditioner according to the present invention.
Detailed Description
The dynamic control method of the electronic expansion valve during refrigeration of the capillary radiation air conditioner of the present invention is further described in detail with reference to the specific embodiments.
The invention discloses a dry capillary radiation air conditioner related to the dynamic control method of electronic expansion valve when capillary radiation air conditioner refrigerates, as shown in figure 1, comprising an outdoor machine and a plurality of indoor machines, wherein the outdoor machine comprises a direct current frequency conversion compressor 1, an oil separator 2, a high pressure switch 4, an exhaust temperature sensor 5, a four-way reversing valve 6, an outdoor heat exchanger 7, an outdoor machine fan 8, an outdoor electronic expansion valve 9, a liquid storage device 10, a liquid pipe stop valve 11, an air pipe stop valve 12, a gas-liquid separator 13, an oil return capillary pipe 14, a one-way valve 15, a low pressure switch 16, a suction temperature sensor 17, an outdoor environment temperature sensor 18 and an outdoor heat exchanger temperature sensor 19, each indoor machine comprises an indoor electronic expansion valve 20, a capillary coil 21, a liquid pipe temperature sensor 22, an air pipe temperature sensor 3, an indoor environment temperature, the outlet of the direct current frequency conversion compressor 1 is communicated with the refrigerant inlet of the oil separator 2, the refrigerant outlet of the oil separator 2 is communicated with the D port of the four-way reversing valve 6, the C port of the four-way reversing valve 6 is communicated with one end of the outdoor heat exchanger 7, the other end of the outdoor heat exchanger 7 is simultaneously communicated with one end of the outdoor electronic expansion valve 9 and one end of the one-way valve 15, one end of the liquid storage device 10 is simultaneously communicated with the other end of the outdoor electronic expansion valve 9 and the other end of the one-way valve 15, the other end of the liquid storage device 10 is communicated with one end of the liquid pipe stop valve 11, the other end of the liquid pipe stop valve 11 is simultaneously communicated with one end of all the indoor electronic expansion valves 20, the other end of each indoor electronic expansion valve 20 is communicated with one end of the corresponding capillary pipe coil 21, the other ends of all the capillary, an S port of a four-way reversing valve 6 is communicated with an inlet of a gas-liquid separator 13, an outlet of the gas-liquid separator 13 is simultaneously communicated with an inlet of a direct-current frequency conversion compressor 1 and one end of an oil return capillary tube 14, the other end of the oil return capillary tube 14 is communicated with an oil return port of an oil separator 2, a high-pressure switch 4 and an exhaust temperature sensor 5 are arranged on an outlet pipeline of the direct-current frequency conversion compressor 1, a low-pressure switch 16 and an air suction temperature sensor 17 are arranged on an inlet pipeline of the direct-current frequency conversion compressor 1, an outdoor heat exchanger temperature sensor 19 is arranged on an outdoor heat exchanger 7, a liquid pipe temperature sensor 22 is arranged at a liquid pipe at one end of a capillary pipe coil 21, and an air pipe temperature sensor.
When the dry capillary radiation air conditioner works in a refrigeration mode, the port D and the port C of the four-way reversing valve 6 are communicated with each other, and the port E and the port S are communicated with each other, at the moment, a refrigerant circulates along the route of the direct-current variable-frequency compressor 1, the oil separator 2, the port D of the four-way reversing valve 6, the port C of the four-way reversing valve 6, the outdoor heat exchanger 7, the outdoor electronic expansion valve 9, the one-way valve 15, the liquid storage device 10, the liquid pipe stop valve 11, the indoor electronic expansion valve 20 (at least one), the capillary pipe coil 21 (at least one), the air pipe stop valve 12, the port E of the four-way reversing valve 6, the port S of the four-way reversing valve.
The dynamic control method of the electronic expansion valve during refrigeration of the capillary radiation air conditioner in the embodiment comprises the following steps:
s1, when any one or more indoor units receive a refrigeration starting instruction (namely, capillary tube radiation air-conditioning refrigeration starting), the direct-current frequency conversion compressor 1 and the outdoor unit fan 8 are started, the four-way reversing valve 6 keeps a power-down state, namely, the D port and the C port of the four-way reversing valve 6 are mutually communicated, the E port and the S port are mutually communicated, the opening degree of the outdoor electronic expansion valve 9 is adjusted to be maximum, the opening degrees of the indoor electronic expansion valves 20 of all the indoor units which are not started are adjusted to be minimum, and the opening degrees of the indoor electronic expansion valves 20 of all the indoor units which are started are normally opened;
s2, in the process of refrigeration operation, adjusting the opening of the indoor electronic expansion valve 20 of each starting indoor unit to make the superheat degree delta T of any starting indoor unitiApproaching to the reference target superheat delta T of the corresponding indoor unittarThe method comprises the following steps:
superheat degree delta T of any starting indoor unitiThe expression formula of (a) is:
ΔTi＝Ts-Tg,i(1)；
in the formula (1), TsIs the suction temperature, T, of the DC variable frequency compressor 1g,iThe temperature of the refrigerant at the outlet end of the capillary tube coil 21 of the respective indoor unit.
Reference target superheat delta T of any starting indoor unittarThe expression formula of (a) is:
ΔTtar＝ΔTset+ΔTTd+ΔTavg(2)；
in the formula (2), Δ TsetAs a reference superheat, Δ TTdAccording to the exhaust temperature T of the DC frequency conversion compressor 1dOr the exhaust superheat degree Delta T of the direct current frequency conversion compressor 1dThe first corrected superheat, Δ T, obtainedavgThe second corrected superheat degree is obtained according to the inconsistency of the refrigeration effect of the starting indoor units.
As shown in FIG. 2, the reference superheat degree Δ TsetTaking values according to the following conditions:
when the temperature is less than or equal to 1 ℃ and T is less than or equal toa,i-TsetAt < 3 ℃, Δ Tset＝X+6℃；
When the temperature is less than or equal to 3 ℃ Ta,i-TsetAt < 5 ℃, Δ Tset＝X+5℃；
When the temperature is less than or equal to 5 ℃ and T is less than or equal toa,i-TsetAt < 7 ℃, Δ Tset＝X+4℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 9 ℃ Ta,i-TsetAt < 11 ℃, Δ Tset＝X+2℃；
When the temperature is less than or equal to 11 ℃ and T is less than or equal toa,i-TsetAt < 13 ℃ Δ Tset＝X+1℃；
When T isa,i-TsetAt a temperature of not less than 13 ℃ and a delta Tset＝X℃；
Wherein, Ta,iFor the indoor ambient temperature, T, at which the corresponding indoor unit is turned onsetTarget indoor temperature of the corresponding room set for the user, and Ta,i＞TsetX is a preset constant temperature value; in this embodiment, the value of X ranges from 1 to 4 ℃, and preferably ranges from 2 ℃.
First corrected superheat degree Δ TTdTaking values according to the following conditions:
at regular intervalsTime t2Detecting the discharge temperature T of the DC inverter compressor 1dAnd the degree of superheat DeltaT of the exhaust gas of the direct-current frequency conversion compressor 1d，
When the exhaust temperature T of the DC frequency conversion compressor 1 is obtained by the detectiondNot less than T1Or the exhaust superheat degree Delta T of the direct current frequency conversion compressor 1dNot less than T2Then the delta T after the detectionTdΔ T to be determined after a previous testTdSubtracting 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor 1 is obtained by the detectiondNot more than T3Or the exhaust superheat degree Delta T of the direct current frequency conversion compressor 1dNot more than T4Then the delta T after the detectionTdΔ T to be determined after a previous testTdAdding 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor 1 is obtained by the detectiondBetween T3And T1Exhaust superheat degree delta T of intermittent or direct-current variable frequency compressor 1dBetween T4And T2When the time is longer, the delta T after the detection is carried outTdMaintaining a Δ T determined after a previous testTdThe same;
wherein, T1、T2、T3And T4Are all preset constant temperature values, and T1＞T3，T2＞T4；ΔTTdThe initial temperature value of (a) is 0 ℃; in the present embodiment, T1The value range of (a) is 90-100 ℃, and preferably 95 ℃; t is2The value range of (A) is 40-50 ℃, and preferably 45 ℃; t is3The value range of (A) is 50-60 ℃, and preferably 55 ℃; t is4The value range of (a) is 10-20 ℃, and preferably 15 ℃;
exhaust superheat degree Δ T of direct-current inverter compressor 1dCan pass through "Ts-Tdef"is obtained after calculation, wherein TdefIs the outdoor heat exchanger temperature.
Second corrected degree of superheat Δ TavgTaking values according to the following conditions:
at regular intervals t2Detecting the temperature T of the outlet end of the capillary tube coil 21 of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coil 21 of all the starting indoor units
Figure BDA0002216330400000091
When in use
Figure BDA0002216330400000092
Time, delta T after this detectionavgΔ T to be determined after a previous testavgSubtracting 1 ℃ on the basis;
when in use
Figure BDA0002216330400000093
Time, delta T after this detectionavgΔ T to be determined after a previous testavgAdding 1 ℃ on the basis;
when in use
Figure BDA0002216330400000094
Time, delta T after this detectionavgMaintaining a Δ T determined after a previous testavgThe same;
wherein, T5And T6Are all preset constant temperature values, and T5＞0＞T6；ΔTavgThe initial temperature value of (a) is 0 ℃; in the present embodiment, T5The value range of (A) is 2-4 ℃, and 3 ℃ is preferred; t is6The value range of the (B) is-4 to-2 ℃, and the preferable value range is-3 ℃;
average temperature of outlet end of capillary tube coil 21 of all indoor unitsThe expression formula of (a) is:
Figure BDA0002216330400000096
in the formula (3), n is the number of the started indoor units.
For the second corrected degree of superheat DeltaTavgTo carry out repairThe positive purpose is to make the cooling effect of all the on-machine indoor units consistent.
In order to ensure good refrigeration effect, the reference target superheat degree delta T of any one starting indoor unit is enabledtarThe conditions are satisfied:
0℃≤ΔTtar≤10℃；
namely: when Δ Tset+ΔTTd+ΔTavgAt < 0 ℃, Δ TtarTaking the temperature of 0 ℃ when the delta Tset+ΔTTd+ΔTavgAt > 10 ℃ Δ TtarThe mixture was taken at 10 ℃.
In the present embodiment, t2The value range of (a) is 3-7 min, preferably 5 min;
preferably, the first corrected superheat degree Δ T is adjusted so as to allow for a better individual dynamic adjustment of the electronic expansion valves of the respective on-machine indoor unitsTdAnd a second corrected degree of superheat DeltaTavgIs taken to be at a starting time t of the direct current frequency conversion compressor 11And then opening, namely: starting the direct current frequency conversion compressor 1 for a period of time t1Then, it starts to perform at intervals of time t2Detecting the discharge temperature T of the DC inverter compressor 1dAnd the exhaust superheat degree delta T of the direct current frequency conversion compressor 1dTemperature T of outlet end of capillary tube coil 21 of each starting indoor unitg,iAnd calculating the average temperature T of the outlet ends of the capillary tube coil 21 of all the starting indoor unitsg；t1The value range of (1) is 8-15 min, preferably 10 min.
In order to further avoid the condensation problem of the capillary radiation air conditioner, the reference target superheat degree delta T is requiredtarIs revised by correcting the reference target superheat degree DeltaTtarWhen the value of (A) is dynamically controlled, the superheat degree delta T of a reference target is addedtarThe self-learning and revising functions of the values are as follows:
when any one indoor unit is started up, Ta,i-Tdew,i＜T7In time, the revised reference target superheat degree delta T of any one starting indoor unittarThe expression of' is:
ΔTtar'＝ΔTset+ΔTTd+ΔTavg+ΔTdew(4)；
namely: delta Ttar'＝ΔTtar+ΔTdew；
In the formula (4), Δ TdewA third corrected superheat degree for the preset dew condensation prevention; in the present embodiment, Δ TdewThe value of (a) is 1-2 ℃, and preferably 1 ℃;
when any one indoor unit is started up, Ta,i-Tdew,i≥T8In time, the reference target superheat degree delta T of the corresponding starting indoor unit is not carried outtarRevising;
wherein, Tdew,iFor corresponding dew point temperature, T, of the indoor unit of the machine7And T8Are all preset constant temperature values; in the present embodiment, T7The value range of (A) is 2-3.5 ℃, and 3 ℃ is preferred; t is8The value range of (A) is 3-5 ℃, and preferably 4 ℃.
Dew point temperature T of any one startup indoor unitdew,iThe expression formula of (a) is:
Tdew,i＝Tsq-b(Ta,i-Tsq) (5)；
in the formula (5), TsqThe indoor environment humidity of the corresponding starting indoor unit; coefficient b is according to indoor ambient temperature T of corresponding starting indoor unita,iTake a value, and Ta,iThe higher the value, the smaller the value of coefficient b, specifically:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toa,iB is 1.5 when the temperature is less than or equal to 5 ℃;
when the temperature is lower than 5 DEG Ca,iB is 1.2 when the temperature is less than or equal to 10 ℃;
when 10 ℃ is less than Ta,iB is 0.8 when the temperature is less than or equal to 20 ℃;
when 20 ℃ is less than Ta,iB is 0.5 when the temperature is less than or equal to 30 ℃;
when the temperature is less than 30 DEG Ca,iB is 0.4 at the temperature of less than or equal to 40 ℃.
In order to ensure good refrigeration effect, the reference target superheat degree delta T of any one starting indoor unit is enabledtar' satisfying the condition:
0℃≤ΔTtar'≤10℃；
namely: when Δ Tset+ΔTTd+ΔTavg+ΔTdewAt < 0 ℃, Δ TtarWhen taking 0 ℃ as Δ Tset+ΔTTd+ΔTavg+ΔTdewAt > 10 ℃ Δ Ttar' Take 10 ℃.
In order to improve the anti-condensation effect of the corresponding indoor unit, when any one indoor unit is started, T of the indoor unita,i-Tdew,i＜T7In time, the degree of superheat Δ T needs to be corrected for the firstTdAnd a second corrected degree of superheat DeltaTavgThe value condition of (a) is revised as follows:
revised first corrected superheat degree Δ TTd' values are taken according to the following conditions:
at regular intervals t2Detecting the discharge temperature T of the DC inverter compressor 1dAnd the degree of superheat DeltaT of the exhaust gas of the direct-current frequency conversion compressor 1d，
When the exhaust temperature T of the DC frequency conversion compressor 1 is obtained by the detectiondGreater than T3Or the exhaust superheat degree Delta T of the direct current frequency conversion compressor 1dGreater than T4Then the delta T after the detectionTd' maintenance of Δ T determined after previous testTd' same;
when the exhaust temperature T of the DC frequency conversion compressor 1 is obtained by the detectiondNot more than T3Or the exhaust superheat degree Delta T of the direct current frequency conversion compressor 1dNot more than T4Then the delta T after the detectionTd' Delta T to be determined after previous testTd' plus 1 ℃ on a basis;
revised second corrected degree of superheat Δ Tavg' values are taken according to the following conditions:
at regular intervals t2Detecting the temperature T of the outlet end of the capillary tube coil 21 of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coil 21 of all the starting indoor units
Figure BDA0002216330400000111
When in use
Figure BDA0002216330400000112
Time, delta T after this detectionavg' maintenance of Δ T determined after previous testavg' same;
when in useTime, delta T after this detectionavg' Delta T to be determined after previous testavg' plus 1 ℃ on a basis;
at this time, the revised reference target superheat degree Δ T of any one of the turned-on indoor units is again obtainedtar"is expressed as:
ΔTtar”＝ΔTset+ΔTTd'+ΔTavg'+ΔTdew(6)；
of course, when any one of the indoor units is turned on, Ta,i-Tdew,i≥T8While, the first corrected superheat degree Δ T is not appliedTdAnd a second corrected degree of superheat DeltaTavgThe value condition of (2) is revised.
In the present embodiment, the discharge temperature T of the dc inverter compressor 1dThe suction temperature T of the DC frequency conversion compressor 1 is detected by the exhaust temperature sensor 5sThe temperature T of the refrigerant at the outlet end of the capillary tube coil 21 of each respective indoor unit, detected by the suction temperature sensor 17g,iThe indoor environment temperature T of each indoor machine is detected by the liquid pipe temperature sensor 22a,iThe indoor environment humidity T of each indoor unit is detected by the indoor environment temperature sensor 23sqDetected by the indoor environment humidity sensor 24; temperature T of outdoor heat exchangerdefDetected by the outdoor heat exchanger temperature sensor 19.
According to the embodiment, according to the changes of the temperature of the capillary tube coil of each starting-up indoor unit and the humidity of the corresponding room, the self-adaptive dynamic control and the self-learning and revising function strategies according to the using environment of the capillary radiation air conditioner are simultaneously assisted, and the electronic expansion valves of each starting-up indoor unit are independently and dynamically adjusted in real time, so that the automatic adjustment of the temperature of the capillary tube coil of each starting-up indoor unit is realized, the consistency of the refrigerating effect of each starting-up indoor unit is further realized, the indoor temperature of the corresponding room is ensured to be higher than the dew point temperature, the indoor units are ensured not to be condensed, and the condensation problem of the capillary radiation air conditioner is effectively solved.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should be made within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (10)

1. A dynamic control method of an electronic expansion valve during refrigeration of a capillary radiation air conditioner is characterized by comprising the following steps: in the process of refrigerating operation, the opening degree of the indoor electronic expansion valve of each starting indoor unit is adjusted to ensure that the superheat degree delta T of any starting indoor unitiApproaching to the reference target superheat delta T of the corresponding indoor unittar，
Wherein, the reference target superheat degree delta T of any one startup indoor unittarThe expression formula of (a) is:
ΔTtar＝ΔTset+ΔTTd+ΔTavg(2)；
in the formula (2), Δ TsetAs a reference superheat, Δ TTdAccording to the exhaust temperature T of the DC frequency conversion compressordOr the exhaust superheat degree delta T of the direct current frequency conversion compressordThe first corrected superheat, Δ T, obtainedavgThe second corrected superheat degree is obtained according to the inconsistency of the refrigeration effect of the starting indoor units.
2. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 1, wherein: superheat degree delta T of any starting indoor unitiThe expression formula of (a) is:
ΔTi＝Ts-Tg,i(1)；
in the formula (1), TsIs the suction temperature, T, of the DC variable frequency compressor 1g,iThe temperature of the refrigerant at the outlet end of the capillary tube coil 21 of the respective indoor unit.
3. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 1, wherein: reference superheat degree Δ TsetTaking values according to the following conditions:
when the temperature is less than or equal to 1 ℃ and T is less than or equal toa,i-TsetAt < 3 ℃, Δ Tset＝X+6℃；
When the temperature is less than or equal to 3 ℃ Ta,i-TsetAt < 5 ℃, Δ Tset＝X+5℃；
When the temperature is less than or equal to 5 ℃ and T is less than or equal toa,i-TsetAt < 7 ℃, Δ Tset＝X+4℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 7 ℃ and T is less than or equal toa,i-TsetAt < 9 ℃, Δ Tset＝X+3℃；
When the temperature is less than or equal to 9 ℃ Ta,i-TsetAt < 11 ℃, Δ Tset＝X+2℃；
When the temperature is less than or equal to 11 ℃ and T is less than or equal toa,i-TsetAt < 13 ℃ Δ Tset＝X+1℃；
When T isa,i-TsetAt a temperature of not less than 13 ℃ and a delta Tset＝X℃；
Wherein, Ta,iFor the indoor ambient temperature, T, at which the corresponding indoor unit is turned onsetTarget indoor temperature of the corresponding room set for the user, and Ta,i＞TsetAnd X is a preset constant temperature value.
4. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 1, wherein: first corrected superheat degree Δ TTdTaking values according to the following conditions:
at regular intervals t2Detecting direct currentDischarge temperature T of inverter compressordAnd the exhaust superheat degree delta T of the direct current frequency conversion compressord，
When the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot less than T1Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot less than T2Then the delta T after the detectionTdΔ T to be determined after a previous testTdSubtracting 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot more than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot more than T4Then the delta T after the detectionTdΔ T to be determined after a previous testTdAdding 1 ℃ on the basis;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondBetween T3And T1Exhaust superheat degree delta T of intermediate or direct current frequency conversion compressordBetween T4And T2When the time is longer, the delta T after the detection is carried outTdMaintaining a Δ T determined after a previous testTdThe same;
wherein, T1、T2、T3And T4Are all preset constant temperature values, and T1＞T3，T2＞T4。
5. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 4, wherein: second corrected degree of superheat Δ TavgTaking values according to the following conditions:
at regular intervals t2Detecting temperature T of outlet end of capillary tube coil of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coils of all the indoor units of the starting machine
Figure FDA0002216330390000021
When in use
Figure FDA0002216330390000022
Time, delta T after this detectionavgΔ T to be determined after a previous testavgSubtracting 1 ℃ on the basis;
when in use
Figure FDA0002216330390000023
Time, delta T after this detectionavgΔ T to be determined after a previous testavgAdding 1 ℃ on the basis;
when in use
Figure FDA0002216330390000024
Time, delta T after this detectionavgMaintaining a Δ T determined after a previous testavgThe same;
wherein, T5And T6Are all preset constant temperature values, and T5＞0＞T6。
6. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 5, wherein: at the superheat degree Delta T to the reference targettarWhen the value of (A) is dynamically controlled, the superheat degree delta T of a reference target is addedtarThe self-learning and revising functions of the values are as follows:
when any one indoor unit is started up, Ta,i-Tdew,i＜T7When the temperature of the water is higher than the set temperature,
revised reference target superheat degree delta T of any starting indoor unittarThe expression of' is:
ΔTtar'＝ΔTset+ΔTTd+ΔTavg+ΔTdew(4)；
in the formula (4), Δ TdewA third corrected superheat degree for the preset dew condensation prevention;
when any one indoor unit is started up, Ta,i-Tdew,i≥T8In time, the reference target superheat degree delta T of the corresponding starting indoor unit is not carried outtarRevising;
wherein, Ta,iFor the indoor ambient temperature, T, at which the corresponding indoor unit is turned ondew,iFor corresponding dew point temperature, T, of the indoor unit of the machine7And T8Are all preset constant temperature values.
7. The method of claim 6, wherein the method comprises the steps of: dew point temperature T of any one startup indoor unitdew,iThe expression formula of (a) is:
Tdew,i＝Tsq-b(Ta,i-Tsq) (5)；
in the formula (5), TsqThe indoor environment humidity of the corresponding starting indoor unit; coefficient b is according to indoor ambient temperature T of corresponding starting indoor unita,iTake a value, and Ta,iThe higher the value, the smaller the value of coefficient b, specifically:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toa,iB is 1.5 when the temperature is less than or equal to 5 ℃;
when the temperature is lower than 5 DEG Ca,iB is 1.2 when the temperature is less than or equal to 10 ℃;
when 10 ℃ is less than Ta,iB is 0.8 when the temperature is less than or equal to 20 ℃;
when 20 ℃ is less than Ta,iB is 0.5 when the temperature is less than or equal to 30 ℃;
when the temperature is less than 30 DEG Ca,iB is 0.4 at the temperature of less than or equal to 40 ℃.
8. The method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to the claim 6 or 7, wherein the method comprises the following steps:
when any one indoor unit is started up, Ta,i-Tdew,i＜T7In time, the degree of superheat Δ T needs to be corrected for the firstTdAnd a second corrected degree of superheat DeltaTavgThe value condition of (a) is revised as follows:
revised first corrected superheat degree Δ TTd' values are taken according to the following conditions:
at regular intervals t2Detecting exhaust temperature T of DC variable frequency compressordAnd the exhaust superheat degree delta of the direct current frequency conversion compressorTd，
When the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondGreater than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordGreater than T4Then the delta T after the detectionTd' maintenance of Δ T determined after previous testTd' same;
when the exhaust temperature T of the DC frequency conversion compressor is obtained by the detectiondNot more than T3Or the exhaust superheat degree delta T of the direct current frequency conversion compressordNot more than T4Then the delta T after the detectionTd' Delta T to be determined after previous testTd' plus 1 ℃ on a basis;
revised second corrected degree of superheat Δ Tavg' values are taken according to the following conditions:
at regular intervals t2Detecting temperature T of outlet end of capillary tube coil of each starting indoor unitg,iAnd calculating the average temperature of the outlet ends of the capillary tube coils of all the indoor units of the starting machine
Figure FDA0002216330390000041
When in use
Figure FDA0002216330390000042
Time, delta T after this detectionavg' maintenance of Δ T determined after previous testavg' same;
when in use
Figure FDA0002216330390000043
Time, delta T after this detectionavg' Delta T to be determined after previous testavg' plus 1 ℃ on a basis;
at this time, the revised reference target superheat degree Δ T of any one of the turned-on indoor units is again obtainedtar"is expressed as:
ΔTtar”＝ΔTset+ΔTTd'+ΔTavg'+ΔTdew(6)。
9. the method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 1, wherein: reference target superheat delta T of any starting indoor unittarThe conditions are satisfied:
0℃≤ΔTtar≤10℃；
10. the method for dynamically controlling the electronic expansion valve during the refrigeration of the capillary radiation air conditioner according to claim 1, wherein: for the first corrected degree of superheat DeltaTTdAnd a second corrected degree of superheat DeltaTavgIs taken to be at a period t of starting of the direct current frequency conversion compressor1And then opened.
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