CN111879029A - Heat pump system of micro-channel heat exchanger and optimized restarting heating control method - Google Patents
Heat pump system of micro-channel heat exchanger and optimized restarting heating control method Download PDFInfo
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- CN111879029A CN111879029A CN202010736535.0A CN202010736535A CN111879029A CN 111879029 A CN111879029 A CN 111879029A CN 202010736535 A CN202010736535 A CN 202010736535A CN 111879029 A CN111879029 A CN 111879029A
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- heat exchanger
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- pump system
- compressor
- heat pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
Abstract
The micro-channel heat exchanger heat pump system comprises a compressor, a four-way reversing valve, a liquid storage device, an indoor heat exchanger, an electronic expansion valve, two ball valves and a micro-channel heat exchanger, wherein the micro-channel heat exchanger comprises two liquid collecting pipes, flat pipes and fins; after the reverse cycle defrosting of the heat pump system of the micro-channel heat exchanger is finished, a large amount of refrigerant can be stored in the compressor, meanwhile, because the flat pipes are vertically arranged and are influenced by gravity, the refrigerant can be gathered at the lower part of the micro-channel heat exchanger when the heat pump system of the micro-channel heat exchanger is restarted, the heat exchange of the micro-channel heat exchanger is poor, and the restarting heating evaporation pressure is low. Due to the influence factors, when the heat pump system of the micro-channel heat exchanger is restarted for heating, indoor side hot air blowing needs a long time, and thermal comfort is seriously influenced; the invention provides an optimization control method, which can quickly blow hot air indoors when a micro-channel heat exchanger heat pump system is restarted for heating, so that the thermal comfort is improved.
Description
Technical Field
The invention relates to the technical field of micro-channel heat exchanger heat pump systems, in particular to a micro-channel heat exchanger heat pump system and an optimized restarting heating control method.
Background
Due to global energy shortage and more serious environmental pollution, it is more and more important to seek an environment-friendly and efficient energy utilization mode. The heat pump system has the advantages of directly converting low-grade energy into high-grade energy and having higher energy utilization efficiency, is widely applied to the fields of air conditioners and heat pump water heaters, and is a hot research topic on how to improve the performance of the heat pump system. The micro-channel heat exchanger has the advantages of compact structure, high heat exchange efficiency, small refrigerant charge amount and the like, is widely applied to the field of refrigeration and air conditioning, and can obviously improve the performance of a heat pump system on the heat pump system applying the micro-channel heat exchanger.
When the micro-channel heat exchanger heat pump system finishes defrosting and then starts to heat, the phenomena that evaporation pressure is low, the micro-channel heat exchanger frosts quickly, and system high-low pressure is established slowly exist, so that thermal comfort of the micro-channel heat exchanger heat pump system is seriously influenced.
Disclosure of Invention
In order to solve the problems of the micro-channel heat exchanger heat pump system, the invention aims to provide the micro-channel heat exchanger heat pump system and the optimized restarting heating control method, when the micro-channel heat exchanger heat pump system reaches the defrosting finish standard, an air suction port of a compressor is closed, the compressor is enabled to run for a period of time, refrigerants in the compressor and a liquid storage device are transferred to two heat exchangers, more refrigerants participate in circulation when the micro-channel heat exchanger heat pump system restarts heating, the system is enabled to quickly establish high and low pressure, and hot air is quickly blown to the indoor side; meanwhile, because the flat pipe is arranged and influenced by gravity, the heating stage is restarted, a liquid-phase refrigerant can be gathered at the lower part of the micro-channel heat exchanger, the refrigerant is not uniformly distributed, the micro-channel heat exchanger is poor, the indoor heat exchanger and the micro-channel heat exchanger are communicated through the bypass pipe in the restarting heating stage, the refrigerant of the indoor heat exchanger can quickly flow to the micro-channel heat exchanger, the evaporation pressure is improved, the liquid distribution of the micro-channel heat exchanger is quicker, the refrigerant is more uniformly distributed, the high pressure and the low pressure are quickly established in the system, hot air is quickly blown to the indoor side, and the thermal.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the micro-channel heat exchanger heat pump system comprises a compressor 01, wherein an exhaust port of the compressor 01 is connected with a first port 21 of a four-way reversing valve 02, an air suction port of the compressor 01 is connected with an outlet of a liquid storage device 08, an inlet of the liquid storage device 08 is connected with an outlet of a second ball valve 07, an inlet of the second ball valve 07 is connected with a third port 23 of the four-way reversing valve 02, a fourth port 24 of the four-way reversing valve 02 is connected with an upper liquid collecting pipe 52, a second port 22 of the four-way reversing valve 02 is connected with an indoor heat exchanger 03, the indoor heat exchanger 03 is respectively connected with an electronic expansion valve 04 and a first ball valve 06, the electronic expansion valve 04 and the first ball valve 06 are connected with a lower liquid collecting pipe 51 after being converged, and; the microchannel heat exchanger 05 is composed of a plurality of flat tubes 53 vertically arranged between the lower header 51 and the upper header 52 and communicating the lower header 51 and the upper header 52, and fins 54 installed between the adjacent flat tubes; the control module C1 is connected with the compressor 01, the first ball valve 06, the second ball valve 07 and the temperature sensor T1 respectively.
When the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished, a large amount of refrigerant can be stored in the compressor 01, which is unfavorable for quick hot air blowing at the indoor side of the system, after the system reaches the defrosting finish standard, the second ball valve 07 is closed through the control module C1, so that the compressor 01 sucks the refrigerant in the compressor 01 and the liquid storage device 08, the refrigerant in the compressor 01 and the liquid storage device 08 is transferred to the indoor heat exchanger 03 and the micro-channel heat exchanger 05, and when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished and the heating is restarted, the indoor heat exchanger 03 side can be quickly brought into a high-temperature high-pressure state, so that the indoor side can quickly blow hot air, and the thermal comfort of the micro.
Because the flat pipe 53 of the microchannel heat exchanger is vertically arranged, when the system is restarted for heating, the system is influenced by gravity, a liquid-phase refrigerant is mainly gathered at the lower part of the microchannel heat exchanger 05, the refrigerant is not uniformly distributed, the heat exchange of the microchannel heat exchanger 05 is poor, the system is unfavorable for quickly blowing hot air to the indoor side of the system, the thermal comfort is seriously influenced, the system is restarted for heating, the first ball valve 06 is opened through the control module C1 to directly communicate the indoor heat exchanger 03 with the microchannel heat exchanger 05, the refrigerant of the indoor heat exchanger 03 can quickly flow into the microchannel heat exchanger 05, the liquid distribution of the microchannel heat exchanger 05 is quicker, the heat exchange performance of the microchannel heat exchanger 05 is improved, the indoor heat exchanger 03 can quickly reach a high-temperature and high-pressure state, the indoor side can quickly.
According to the optimized restarting heating control method of the micro-channel heat exchanger heat pump system, when the micro-channel heat exchanger heat pump system performs reverse cycle defrosting, if the temperature T of the temperature sensor T1 is high1When the temperature is higher than T, the heat pump system of the micro-channel heat exchanger reaches the defrosting end standard, the control module C1 closes the second ball valve 07 at the moment, and the control module C1 controls the compressor 01 to continue to operate S1Second, then the compressor 01 is stopped if the temperature sensor T1 has a temperature T1When the temperature is less than T, the heat pump system of the micro-channel heat exchanger continues defrosting; when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished and the compressor 01 is started, the control module C1 opens the first ball valve 06, and when the compressor 01 runs to S2Second, the control module C1 opens the second ball valve 07 when the compressor 01 is running S3After seconds, the control module C1 closes the first ball valve 06; wherein the setting parameter T, S1、S2、S3The value ranges are shown in the following table:
| parameter(s) | T | S1 | S2 | S3 |
| Value range | 15℃-18℃ | 30s-50s | 40s-70s | 120s-180s |
。
Compared with the prior art, the invention has the following advantages:
1. the invention provides a scheme for optimizing the distribution of refrigerant after defrosting of a heat pump system of a micro-channel heat exchanger is finished, the refrigerant in a compressor and a liquid storage device is sucked by the compressor by closing an air suction port of the compressor, so that the refrigerant is transferred to an indoor heat exchanger and the micro-channel heat exchanger, and when heating is started again, the side of the indoor heat exchanger can be quickly in a high-temperature and high-pressure state, so that hot air is quickly blown to the indoor side, and the thermal comfort of the system is improved.
2. The invention provides a scheme for optimizing that the refrigerant distribution in the micro-channel heat exchanger in the restarting heating stage is more uniform, the indoor heat exchanger and the micro-channel heat exchanger are communicated through the bypass pipe in the restarting heating stage, so that the refrigerant of the indoor heat exchanger can quickly flow to the micro-channel heat exchanger, the refrigerant distribution uniformity of the micro-channel heat exchanger is improved, the heat exchange performance of the micro-channel heat exchanger is improved, hot air can be quickly blown to the indoor side, and the thermal comfort of the system is improved.
Drawings
FIG. 1 is a schematic diagram of reverse cycle defrosting of a micro-channel heat exchanger heat pump system according to the present invention.
FIG. 2 is a schematic view of the heat pump system of the microchannel heat exchanger for restarting heating.
Detailed Description
The following detailed description of 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 present invention includes a compressor 01, an exhaust port of the compressor 01 is connected to a first port 21 of a four-way reversing valve 02, an air suction port of the compressor 01 is connected to an outlet of a reservoir 08, an inlet of the reservoir 08 is connected to an outlet of a second ball valve 07, an inlet of the second ball valve 07 is connected to a third port 23 of the four-way reversing valve 02, a fourth port 24 of the four-way reversing valve 02 is connected to an upper header 52, a second port 22 of the four-way reversing valve 02 is connected to an indoor heat exchanger 03, the indoor heat exchanger 03 is connected to an electronic expansion valve 04 and a first ball valve 06, the electronic expansion valve 04 and the first ball valve 06 are joined and then connected to a lower header 51, and a temperature sensor T1 is disposed on; the microchannel heat exchanger 05 is composed of a plurality of flat tubes 53 vertically arranged between the lower header 51 and the upper header 52 and communicating the lower header 51 and the upper header 52, and fins 54 installed between the adjacent flat tubes; the control module C1 is connected with the compressor 01, the first ball valve 06, the second ball valve 07 and the temperature sensor T1 respectively.
As shown in fig. 1, when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished, a large amount of refrigerant can be stored in the compressor 01, which is unfavorable for the indoor side of the system to blow hot air quickly, after the system reaches the defrosting finish standard, the second ball valve 07 is closed through the control module C1, so that the compressor 01 sucks the refrigerant in the compressor 01 and the liquid storage device 08, the refrigerant in the compressor 01 and the liquid storage device 08 is transferred to the indoor heat exchanger 03 and the micro-channel heat exchanger 05, and when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished and the heating is started again, the indoor heat exchanger 03 side can reach a high-temperature high-pressure state quickly, so that the indoor side blows hot air quickly, and the thermal comfort of the micro.
As shown in fig. 2, because flat pipe 53 of microchannel heat exchanger is arranged perpendicularly, when restarting heats, receive the influence of gravity, liquid phase refrigerant mainly gathers in microchannel heat exchanger 05 lower part, lead to refrigerant uneven distribution, microchannel heat exchanger 05 heat transfer is relatively poor, this is unfavorable to the indoor side of system fast blowing hot-blast, seriously influence thermal comfort, the system restarts the stage of heating, open first ball valve 06 through control module C1 and make indoor heat exchanger 03 and microchannel heat exchanger 05 direct intercommunication, make indoor heat exchanger 03 refrigerant flow into microchannel heat exchanger 05 fast, let microchannel heat exchanger 05 cloth liquid faster, promote the heat transfer performance of microchannel heat exchanger 05, can make indoor heat exchanger 03 side reach high temperature high-pressure state fast, make the indoor side blow hot-blast fast, promote thermal comfort.
According to the optimized restarting heating control method of the micro-channel heat exchanger heat pump system, when the micro-channel heat exchanger heat pump system performs reverse cycle defrosting, if the temperature T of the temperature sensor T1 is detected1When the temperature is higher than T, the heat pump system of the micro-channel heat exchanger reaches the defrosting end standard, the control module C1 closes the second ball valve 07 at the moment, and the control module C1 controls the compressor 01 to continue to operate S1Second, then the compressor 01 is stopped if the temperature sensor T1 has a temperature T1When the temperature is less than T, the heat pump system of the micro-channel heat exchanger continues defrosting; when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished and the compressor 01 is started, the control module C1 opens the first ball valve 06, and when the compressor 01 runs to S2Second, the control module C1 opens the second ball valve 07 when the compressor 01 is running S3After seconds, the control module C1 closes the first ball valve 06; wherein the setting parameter T, S1、S2、S3The value ranges are shown in the following table:
| parameter(s) | T | S1 | S2 | S3 |
| Value range | 15℃-18℃ | 30s-50s | 40s-70s | 120s-180s |
。
Claims (4)
1. Micro-channel heat exchanger heat pump system, its characterized in that: the air exhaust port of the compressor (01) is connected with a first port (21) of a four-way reversing valve (02), an air suction port of the compressor (01) is connected with an outlet of a liquid storage device (08), an inlet of the liquid storage device (08) is connected with an outlet of a second ball valve (07), an inlet of the second ball valve (07) is connected with a third port (23) of the four-way reversing valve (02), a fourth port (24) of the four-way reversing valve (02) is connected with an upper liquid collecting pipe (52), a second port (22) of the four-way reversing valve (02) is connected with an indoor heat exchanger (03), the indoor heat exchanger (03) is connected with an electronic expansion valve (04) and a first ball valve (06) respectively, the electronic expansion valve (04) and the first ball valve (06) are connected with a lower liquid collecting pipe (51) after being converged, and a temperature sensor (T1) is arranged on a pipeline connected with the lower liquid collecting; the micro-channel heat exchanger (05) is composed of a plurality of flat tubes (53) which are vertically arranged between the lower liquid collecting tube (51) and the upper liquid collecting tube (52) and communicated with the lower liquid collecting tube (51) and the upper liquid collecting tube (52), and fins (54) which are arranged between the adjacent flat tubes; the control module (C1) is respectively connected with the compressor (01), the first ball valve (06), the second ball valve (07) and the temperature sensor (T1).
2. The microchannel heat exchanger heat pump system of claim 1, wherein: when the reverse circulation defrosting of the micro-channel heat exchanger heat pump system is finished, a large amount of refrigerant can be stored in the compressor (01), which is unfavorable for the indoor side of the system to blow hot air quickly, after the system reaches the defrosting finishing standard, the second ball valve (07) is closed through the control module (C1), the compressor (01) sucks the refrigerant in the compressor (01) and the liquid storage device (08), the refrigerant in the compressor (01) and the liquid storage device (08) is transferred to the indoor heat exchanger (03) and the micro-channel heat exchanger (05), and when the reverse circulation defrosting of the micro-channel heat exchanger heat pump system is finished and the system is restarted for heating, the indoor heat exchanger (03) side can reach a high-temperature and high-pressure state quickly, the indoor side blows hot air quickly, and the thermal comfort of the micro-channel heat exchanger heat.
3. The microchannel heat exchanger heat pump system of claim 1, wherein: because the flat tubes (53) of the microchannel heat exchanger are vertically arranged, when the microchannel heat exchanger is restarted for heating, liquid-phase refrigerant is mainly gathered at the lower part of the microchannel heat exchanger (05) under the influence of gravity, so that the refrigerant is unevenly distributed, the heat exchange of the microchannel heat exchanger (05) is poor, this is disadvantageous for the indoor side of the system to blow hot air rapidly, which seriously affects the thermal comfort, and the system restarts the heating stage, open first ball valve (06) through control module (C1) and make indoor heat exchanger (03) and microchannel heat exchanger (05) direct intercommunication, make indoor heat exchanger (03) refrigerant flow into microchannel heat exchanger (05) fast, let microchannel heat exchanger (05) cloth liquid faster, promote the heat transfer performance of microchannel heat exchanger (05), can make indoor heat exchanger (03) side reach the high-pressure state of high temperature fast, make indoor side blow hot-blast fast, promote thermal comfort.
4. The method for optimized restart heating control of a microchannel heat exchanger heat pump system according to any one of claims 1 to 3, wherein: when the micro-channel heat exchanger heat pump system carries out reverse cycle defrosting, if the temperature T of the temperature sensor (T1)1When the temperature is higher than T, the heat pump system of the micro-channel heat exchanger reaches the defrosting end standard, at the moment, the control module (C1) closes the second ball valve (07), and the control module (C1) controls the compressor (01) to continue to operate S1Second, then the compressor (01) is stopped if the temperature sensor (T1) is at temperature T1When the temperature is less than T, the heat pump system of the micro-channel heat exchanger continues defrosting; when the reverse cycle defrosting of the micro-channel heat exchanger heat pump system is finished and the compressor (01) is started, the control module (C1) opens the first ball valve (06) and the compressor (01) runs to S2When the second time, the control module (C1) opens the second ball valve (07), and when the compressor (01) runs to S3After second, control the dieBlock (C1) closes the first ball valve (06); wherein the setting parameter T, S1、S2、S3The value ranges are shown in the following table:
。
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| CN202010736535.0A CN111879029B (en) | 2020-07-28 | 2020-07-28 | Heat pump system of micro-channel heat exchanger and optimized restarting heating control method |
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| CN111879029B CN111879029B (en) | 2021-05-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264092A (en) * | 2022-01-04 | 2022-04-01 | 珠海格力电器股份有限公司 | Refrigerant circulation equipment and system, control method, controller and storage medium |
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| JPH11281183A (en) * | 1998-03-31 | 1999-10-15 | Fujitsu General Ltd | Air conditioner |
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