CN115615046A - Heat pump system of micro-channel heat exchanger and control method thereof - Google Patents

Heat pump system of micro-channel heat exchanger and control method thereof Download PDF

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Publication number
CN115615046A
CN115615046A CN202211244683.6A CN202211244683A CN115615046A CN 115615046 A CN115615046 A CN 115615046A CN 202211244683 A CN202211244683 A CN 202211244683A CN 115615046 A CN115615046 A CN 115615046A
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China
Prior art keywords
ball valve
heat exchanger
pump system
heat
temperature
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CN202211244683.6A
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Chinese (zh)
Inventor
刘国强
熊通
汪思远
晏刚
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN202211244683.6A priority Critical patent/CN115615046A/en
Publication of CN115615046A publication Critical patent/CN115615046A/en
Pending legal-status Critical Current

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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
    • 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
    • F25B39/00—Evaporators; Condensers
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • 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

Abstract

A micro-channel heat exchanger heat pump system and a control method thereof are provided, wherein the micro-channel heat exchanger heat pump system comprises a compressor, 2 indoor heat exchangers, a gas-liquid separator, a micro-channel heat exchanger, 5 ball valves, 2 throttling valves and 2 heat exchange tubes; when the microchannel heat exchanger works under the frosting working condition, the problems of higher frosting rate and higher attenuation of heat exchange performance exist, in addition, condensate can appear in the heat exchanger in the heat exchange process, and the heat exchange thermal resistance can be increased by the condensate; the invention provides a control method of a heat pump system of a micro-channel heat exchanger, which utilizes a high-temperature refrigerant from a gas-liquid separator and a second indoor heat exchanger to heat a low-temperature refrigerant in the micro-channel heat exchanger, improves the evaporation temperature, delays frosting, and controls the heat pump system according to the operation load of the heat pump system and the surface temperature of a flat pipe, so that the heat pump system operates efficiently.

Description

Heat pump system of micro-channel heat exchanger and control method thereof
Technical Field
The invention relates to the technical field of a micro-channel heat exchanger heat pump system, in particular to a micro-channel heat exchanger heat pump system and a control method thereof.
Background
The microchannel heat exchanger has been widely applied to the field of refrigeration air conditioners due to the advantages of high heat exchange efficiency, small volume, compact structure, small refrigerant filling amount, low production cost and the like, but the microchannel heat exchanger is used as an evaporator and works under the frosting working condition, so that the problems of too high frosting rate and high attenuation of heat exchange performance exist, in addition, condensate can appear in the condensation process of the condenser, the condensate can form a layer of liquid film in the heat exchanger, and the heat exchange thermal resistance is increased.
Two main reasons influencing the rapid frosting of the microchannel heat exchanger are air humidity and surface temperature, which usually needs to pay a large cost for changing the air humidity, and is difficult to popularize and apply in the field of heat pump air conditioners. In addition, the effective means for improving the heat exchange performance is to improve the performance of the heat pump system and separate the condensate in time.
Disclosure of Invention
In view of the problems of the heat pump system of the micro-channel heat exchanger, the invention aims to provide a heat pump system of the micro-channel heat exchanger and a control method thereof.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a micro-channel heat exchanger heat pump system comprises a compressor 01, a first indoor heat exchanger 02 and a gas-liquid separator 03, wherein an exhaust port of the compressor 01 is connected with the first indoor heat exchanger 02, the first indoor heat exchanger 02 is connected with an inlet 301 of the gas-liquid separator, a gas outlet 302 of the gas-liquid separator is connected with a first ball valve 04, the first ball valve 04 is connected with an inlet of a second indoor heat exchanger 05, an outlet of the second indoor heat exchanger 05 is connected with a fourth ball valve 08 and a fifth ball valve 09 respectively, a liquid outlet 303 of the gas-liquid separator is connected with a second ball valve 06 and a third ball valve 07 respectively, the first heat exchange tube 10 is connected with the second ball valve 06, the second heat exchanger 11 is connected with a fourth ball valve 08, the first heat exchange tube 10 and the second heat exchange tube 11 are installed in a first liquid collecting tube 12, a throttle valve 13 is connected with the first heat exchange tube 10, the second heat exchange tube 11, the third ball valve 07 and the fifth ball valve 09 respectively, the throttle valve 13 is connected with the first liquid collecting tube 12, the throttle valve 13 is arranged between the first liquid collecting tube 12 and the second liquid collecting tube 16 and communicated with the first heat exchange tube 12 and the second heat exchange tube 16, a flat tube 14 of the flat tube 16 is installed on the surface of the flat tube 15 of the compressor 01, a flat tube 14 is used for testing the surface of the compressor, and a temperature sensor 14 of the flat tube 14 is arranged on the surface of the compressor 01; the first heat exchange tube 10, the second heat exchange tube 11, the first liquid collecting tube 12, the second liquid collecting tube 16, the flat tube 14 and the fin 15 form a micro-channel heat exchanger, the first ball valve 04, the second ball valve 06, the third ball valve 07, the fourth ball valve 08, the fifth ball valve 09 and the temperature sensor T1 are respectively connected with the control module C1, and the control module C1 controls the on-off of each ball valve according to the working load and the working condition of the heat pump system.
The gas-liquid separator 03 is arranged between the first indoor heat exchanger 02 and the second indoor heat exchanger 05, when the heat pump system works at full load, condensate can appear in the condensation process, the condensate can form a layer of liquid film on the inner wall surface of the first indoor heat exchanger 02, heat exchange of the heat exchangers is not facilitated, the condensate can be separated by the gas-liquid separator 03, a refrigerant entering the second indoor heat exchanger 05 is made to be gas, and therefore the heat exchange performance of the second indoor heat exchanger 05 is improved; when the heat pump system works under low load, the heat exchange requirement can be met only by one indoor heat exchanger, at the moment, the first ball valve 04 is closed by the control module C1, and indoor heat supply is realized only by the first indoor heat exchanger 02, so that the pressure drop of the first indoor heat exchanger is reduced, and the performance of the heat pump system is improved.
The control module C1 detects the surface temperature change of the flat tube 14 according to the temperature sensor T1, judges whether the microchannel heat exchanger is in a frosting state, and when the microchannel heat exchanger is in the frosting state, the high-temperature condensate separated out by the gas-liquid separator 03 and the high-temperature refrigerant separated out by the second indoor heat exchanger 05 are respectively introduced into the first heat exchange tube 10 and the second heat exchange tube 11 to heat the low-temperature refrigerant in the first liquid collecting tube 12, so that the surface temperature of the flat tube 14 is increased, the growth of a frost layer is inhibited, the operation time of the heat pump system is prolonged, and the operation performance of the heat pump system under the frosting working condition is improved.
According to the control method of the micro-channel heat exchanger heat pump system, the control module C1 collects signals of the working load and the working condition of the heat pump system and controls the first ball valve 04, the second ball valve 06, the third ball valve 07, the fourth ball valve 08 and the fifth ball valve 09 to be switched on and switched off, and the specific control method is as follows:
when the heat pump system is operated under the non-frosting working condition:
when the heat pump system works at full load, the control module C1 controls the first ball valve 04, the third ball valve 07 and the fifth ball valve 09 to be opened, the second ball valve 06 and the fourth ball valve 08 to be closed, at the moment, the gas-liquid separator 03 separates condensate, and the high-temperature condensate enters the second indoor heat exchange tube 05; when the heat pump system works at a low load, the control module C1 controls the third ball valve 07 to be opened, the first ball valve 04, the second ball valve 06, the fourth ball valve 08 and the fifth ball valve 09 to be closed, the flow rate of the refrigerant is small at the moment, gas-liquid separation is not needed, and the refrigerant only flows through the first indoor heat exchanger 02, so that the pressure drop is reduced, and the performance of the heat pump system is improved;
when the heat pump system works under the frosting working condition:
when the heat pump system works at full load, the control module C1 controls the high-temperature refrigerants entering the first heat exchange tube 10 and the second heat exchange tube 11 according to the surface temperature of the flat tube 14Amount, temperature T of surface of micro-channel heat exchanger as measured by temperature sensor T1 1 At the temperature of more than or equal to-2 ℃, the surface of the micro-channel heat exchanger is not frosted seriously, the requirement can be met only by enabling high-temperature condensate separated by the gas-liquid separator 03 to enter the first heat exchange tube 10 to heat the low-temperature refrigerant in the first liquid collecting tube 12, at the moment, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fifth ball valve 09 to be opened, the third ball valve 07 and the fourth ball valve 08 to be closed, and when T is greater than or equal to the preset temperature, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fifth ball valve 09 to be closed 1 The temperature is lower than-2 ℃, the surface of the micro-channel heat exchanger is seriously frosted, high-temperature condensate separated by the gas-liquid separator 03 enters the first heat exchange tube 10, high-temperature refrigerant separated by the second indoor heat exchanger 05 enters the second heat exchange tube 10 to heat low-temperature refrigerant in the first liquid collecting tube 12, at the moment, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fourth ball valve 08 to be opened, and the third ball valve 07 and the fifth ball valve 09 to be closed; when the heat pump system works at a low load, heat supply can be met only by heat exchange of the first indoor heat exchanger 02, and the control module C1 controls the first ball valve 04, the third ball valve 07, the fourth ball valve 08 and the fifth ball valve 09 to be closed.
Compared with the prior art, the invention has the following advantages
1. The invention provides a micro-channel heat exchanger heat pump system and a control method thereof, which fully utilize high-temperature refrigeration from a gas-liquid separator and a second indoor heat exchanger to heat a low-temperature refrigerant in the micro-channel heat exchanger, improve the evaporation temperature and delay the frosting.
2. The invention provides a micro-channel heat exchanger heat pump system and a control method thereof, which can control the high-efficiency operation of the heat pump system according to the operation load of the heat pump system and the temperature of the surface of a flat tube.
Drawings
Fig. 1 is a schematic diagram of a refrigerant flow of a micro-channel heat exchanger heat pump system under a full-load operation frosting condition.
Fig. 2 is a schematic diagram of a refrigerant flow of a micro-channel heat exchanger heat pump system under a low-load operation frosting condition.
Detailed Description
The following detailed description of the embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1 and 2, the microchannel heat exchanger heat pump system of the invention comprises a compressor 01, a first indoor heat exchanger 02 and a gas-liquid separator 03, wherein an exhaust port of the compressor 01 is connected with the first indoor heat exchanger 02, the first indoor heat exchanger 02 is connected with an inlet 301 of the gas-liquid separator, a gas outlet 302 of the gas-liquid separator is connected with a first ball valve 04, the first ball valve 04 is connected with an inlet of a second indoor heat exchanger 05, an outlet of the second indoor heat exchanger 05 is respectively connected with a fourth ball valve 08 and a fifth ball valve 09, a liquid outlet 303 of the gas-liquid separator is respectively connected with a second ball valve 06 and a third ball valve 07, the first heat exchange tube 10 is connected with the second ball valve 06, the second heat exchanger 11 is connected with the fourth ball valve 08, the first heat exchange tube 10 and the second heat exchange tube 11 are both installed in a first liquid collecting tube 12, a throttle valve 13 is respectively connected with the first heat exchange tube 10, the second heat exchange tube 11, the third ball valve 07 and the fifth ball valve 09, the throttle 13 is connected with the first liquid collecting tube 12, the second heat exchange tube 12 is communicated with the second liquid collecting tube 14, a temperature sensor is installed on the surface of the compressor 14, and a flat tube 14 is used for testing, and a plurality of the flat tube 14 is installed between the flat tube 1; the first heat exchange tube 10, the second heat exchange tube 11, the first liquid collecting tube 12, the second liquid collecting tube 16, the flat tube 14 and the fin 15 form a micro-channel heat exchanger, the first ball valve 04, the second ball valve 06, the third ball valve 07, the fourth ball valve 08, the fifth ball valve 09 and the temperature sensor T1 are respectively connected with the control module C1, and the control module C1 controls the on-off of each ball valve according to the working load and the working condition of the heat pump system.
According to the heat pump system, the gas-liquid separator 03 is arranged between the first indoor heat exchanger 02 and the second indoor heat exchanger 05, when the heat pump system works at full load, condensate can appear in the condensation process, the condensate can form a layer of liquid film on the inner wall surface of the first indoor heat exchanger 02, heat exchange of the heat exchangers is not facilitated, the condensate can be separated by the gas-liquid separator 03, a refrigerant entering the second indoor heat exchanger 05 is made to be gas, and therefore the heat exchange performance of the second indoor heat exchanger 05 is improved; when the heat pump system works under low load, the heat exchange requirement can be met only by one indoor heat exchanger, at the moment, the control module C1 closes the first ball valve 04, and only the first indoor heat exchanger 02 is used for supplying heat to the indoor space, so that the pressure drop of the first indoor heat exchanger is reduced, and the performance of the heat pump system is improved.
The control module C1 detects the surface temperature change of the flat tube 14 according to the temperature sensor T1, judges whether the microchannel heat exchanger is in a frosting state, and when the microchannel heat exchanger is in the frosting state, the high-temperature condensate separated by the gas-liquid separator 03 and the high-temperature refrigerant coming out of the second indoor heat exchanger 05 are respectively introduced into the first heat exchange tube 10 and the second heat exchange tube 11 to heat the low-temperature refrigerant in the first liquid collecting tube 12, so that the surface temperature of the flat tube 14 is increased, the increase of a frost layer is inhibited, the operation time of the heat pump system is prolonged, and the operation performance of the heat pump system under the frosting working condition is improved.
According to the control method of the micro-channel heat exchanger heat pump system, the control module C1 collects signals of the working load and the working condition of the heat pump system and controls the first ball valve 04, the second ball valve 06, the third ball valve 07, the fourth ball valve 08 and the fifth ball valve 09 to be opened and closed, and the specific control method is as follows:
when the heat pump system is operated under the non-frosting working condition:
when the heat pump system works at full load, the control module C1 controls the first ball valve 04, the third ball valve 07 and the fifth ball valve 09 to be opened, the second ball valve 06 and the fourth ball valve 08 to be closed, at the moment, high-temperature exhaust gas of the compressor 01 enters the first indoor heat exchanger 02 for condensation and heat exchange, then enters the gas-liquid separator 03 for separation of condensate, and the high-temperature condensate enters the second indoor heat exchange tube 05; when the heat pump system works at a low load, the control module C1 controls the third ball valve 07 to be opened, the first ball valve 04, the second ball valve 06, the fourth ball valve 08 and the fifth ball valve 09 to be closed, the flow rate of the refrigerant is small at the moment, gas-liquid separation is not needed, and the refrigerant only flows through the first indoor heat exchanger 02, so that the pressure drop is reduced, and the performance of the heat pump system is improved;
when the heat pump system works under the frosting working condition:
when the heat pump system works at full load, the control module C1 controls the surfaces of the flat pipes 14The temperature is controlled to control the amount of the high temperature refrigerant introduced into the first heat exchanging pipe 10 and the second heat exchanging pipe 11 when the temperature T of the surface of the microchannel heat exchanger measured by the temperature sensor T1 is measured 1 At the temperature of more than or equal to-2 ℃, the surface of the micro-channel heat exchanger is not seriously frosted, the requirement can be met only by allowing high-temperature condensate separated by the gas-liquid separator 03 to enter the first heat exchange tube 10 to heat low-temperature refrigerant in the first liquid collecting tube 12, at the moment, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fifth ball valve 09 to be opened, the third ball valve 07 and the fourth ball valve 08 to be closed, and when T is equal to or more than the temperature of-2 ℃, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fourth ball valve 08 to be closed 1 The temperature is lower than-2 ℃, the surface of the micro-channel heat exchanger is frosted seriously, a high-temperature condensate separated by the gas-liquid separator 03 enters the first heat exchange tube 10, a high-temperature refrigerant separated by the second indoor heat exchanger 05 enters the second heat exchange tube 10 to heat a low-temperature refrigerant in the first liquid collecting tube 12, the refrigerant enters the flat tube 14 for evaporation and heat exchange after passing through the first liquid collecting tube 12, then enters the second liquid collecting tube 16, the refrigerant coming out of the second liquid collecting tube 16 enters the compressor 01 for compression, at the moment, the control module C1 controls the first ball valve 04, the second ball valve 06 and the fourth ball valve 08 to be opened, and the third ball valve 07 and the fifth ball valve 09 to be closed; when the heat pump system works at a low load, heat supply can be met only by exchanging heat through the first indoor heat exchanger 02, and the control module C1 controls the first ball valve 04, the third ball valve 07, the fourth ball valve 08 and the fifth ball valve 09 to be closed.

Claims (4)

1. A microchannel heat exchanger heat pump system, characterized in that: comprises a compressor (01), a first indoor heat exchanger (02), a gas-liquid separator (03), wherein an exhaust port of the compressor (01) is connected with the first indoor heat exchanger (02), the first indoor heat exchanger (02) is connected with an inlet (301) of the gas-liquid separator, a gas outlet (302) of the gas-liquid separator is connected with a first ball valve (04), the first ball valve (04) is connected with an inlet of a second indoor heat exchanger (05), an outlet of the second indoor heat exchanger (05) is respectively connected with a fourth ball valve (08) and a fifth ball valve (09), a liquid outlet (303) of the gas-liquid separator is respectively connected with a second ball valve (06) and a third ball valve (07), a first heat exchange tube (10) is connected with a second ball valve (06), the second heat exchanger (11) is connected with the fourth ball valve (08), the first heat exchange tube (10) and the second heat exchange tube (11) are both arranged in a first liquid collecting tube (12), a throttle valve (13) is respectively connected with the first heat exchange tube (10), the second heat exchange tube (11), the third ball valve (07) is connected with a fifth ball valve (09), a second liquid collecting tube (13) is connected with a second liquid collecting tube (16) and a second liquid collecting tube (16), the fin (15) is arranged between the adjacent flat tubes, the second liquid collecting tube (16) is connected with an inlet of the compressor (01), and the temperature sensor (T1) is arranged on the surface of the flat tube (14) and used for testing the temperature of the surface of the micro-channel heat exchanger; the micro-channel heat exchanger comprises a first heat exchange tube (10), a second heat exchange tube (11), a first liquid collecting tube (12), a second liquid collecting tube (16), flat tubes (14) and fins (15), wherein the first ball valve (04), a second ball valve (06), a third ball valve (07), a fourth ball valve (08), a fifth ball valve (09) and a temperature sensor (T1) are respectively connected with a control module (C1), and the control module (C1) controls the on and off of each ball valve according to the working load and working condition of the heat pump system.
2. The microchannel heat exchanger heat pump system of claim 1, wherein: a gas-liquid separator (03) is arranged between the first indoor heat exchanger (02) and the second indoor heat exchanger (05), when the heat pump system works at full load, condensate can appear in the condensation process, the condensate can form a layer of liquid film on the inner wall surface of the first indoor heat exchanger (02) and is not beneficial to heat exchange of the heat exchangers, the condensate can be separated by the gas-liquid separator (03), and a refrigerant entering the second indoor heat exchanger (05) is made to be gas, so that the heat exchange performance of the second indoor heat exchanger (05) is improved; when the heat pump system works under low load, the heat exchange requirement can be met only by one indoor heat exchanger, at the moment, the first ball valve (04) is closed by the control module (C1), and indoor heat supply is realized only by the first indoor heat exchanger (02), so that the pressure drop of the first indoor heat exchanger is reduced, and the performance of the heat pump system is improved.
3. The microchannel heat exchanger heat pump system of claim 1, wherein: the control module (C1) detects the surface temperature change of the flat pipe (14) according to the temperature sensor (T1) to judge whether the micro-channel heat exchanger is in a frosting state, when the micro-channel heat exchanger is in the frosting state, high-temperature condensate separated by the gas-liquid separator (03) and high-temperature refrigerant separated by the second indoor heat exchanger (05) are respectively introduced into the first heat exchange pipe (10) and the second heat exchange pipe (11) to heat the low-temperature refrigerant in the first liquid collecting pipe (12), the surface temperature of the flat pipe (14) is increased, the growth of a frost layer is inhibited, the running time of the heat pump system is prolonged, and the running performance of the heat pump system under the frosting working condition is improved.
4. A method of controlling a microchannel heat exchanger heat pump system as set forth in any one of claims 1-3, wherein: the control module (C1) collects signals of the working load and the working condition of the heat pump system and controls the first ball valve (04), the second ball valve (06), the third ball valve (07), the fourth ball valve (08) and the fifth ball valve (09) to be switched on and off, and the specific control method is as follows:
when the heat pump system is operated under the non-frosting working condition:
when the heat pump system works at full load, the control module (C1) controls the first ball valve (04), the third ball valve (07) and the fifth ball valve (09) to be opened, the second ball valve (06) and the fourth ball valve (08) are closed, at the moment, the gas-liquid separator (03) separates condensate, and high-temperature condensate enters the second indoor heat exchange tube (05); when the heat pump system works in a low load mode, the control module (C1) controls the third ball valve (07) to be opened, the first ball valve (04), the second ball valve (06), the fourth ball valve (08) and the fifth ball valve (09) are closed, at the moment, the flow of the refrigerant is small, gas-liquid separation is not needed, and the refrigerant only flows through the first indoor heat exchanger (02), so that the pressure drop is reduced, and the performance of the heat pump system is improved;
when the heat pump system works under the frosting working condition:
when the heat pump system works at full load, the control module (C1) controls the amount of high-temperature refrigerants entering the first heat exchange tube (10) and the second heat exchange tube (11) according to the surface temperature of the flat tube (14), and the temperature T of the surface of the micro-channel heat exchanger tested by the temperature sensor (T1) 1 The temperature is more than or equal to-2 ℃, the surface of the micro-channel heat exchanger is not frosted seriously, and only high-temperature condensate separated by the gas-liquid separator (03) enters the first heat exchange tube (10) to heat the low-temperature system in the first liquid collecting tube (12)The refrigerant can meet the requirement, at the moment, the control module (C1) controls the first ball valve (04), the second ball valve (06) and the fifth ball valve (09) to be opened, the third ball valve (07) and the fourth ball valve (08) to be closed, and when T is reached 1 The temperature is lower than minus 2 ℃, the surface of the micro-channel heat exchanger is frosted seriously, high-temperature refrigerant separated by the gas-liquid separator (03) enters the first heat exchange tube (10) and high-temperature refrigerant discharged from the second indoor heat exchanger (05) enters the second heat exchange tube (10) to heat low-temperature refrigerant in the first liquid collecting tube (12), at the moment, the control module (C1) controls the first ball valve (04), the second ball valve (06) and the fourth ball valve (08) to be opened, and the third ball valve (07) and the fifth ball valve (09) are closed; when the heat pump system works in a low load mode, heat supply can be achieved only through heat exchange of the first indoor heat exchanger (02), and the control module (C1) controls the first ball valve (04), the third ball valve (07), the fourth ball valve (08) and the fifth ball valve (09) to be closed.
CN202211244683.6A 2022-10-12 2022-10-12 Heat pump system of micro-channel heat exchanger and control method thereof Pending CN115615046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211244683.6A CN115615046A (en) 2022-10-12 2022-10-12 Heat pump system of micro-channel heat exchanger and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211244683.6A CN115615046A (en) 2022-10-12 2022-10-12 Heat pump system of micro-channel heat exchanger and control method thereof

Publications (1)

Publication Number Publication Date
CN115615046A true CN115615046A (en) 2023-01-17

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ID=84862601

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211244683.6A Pending CN115615046A (en) 2022-10-12 2022-10-12 Heat pump system of micro-channel heat exchanger and control method thereof

Country Status (1)

Country Link
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