CN111023629B - Micro-channel heat exchanger and uniform defrosting control method thereof - Google Patents
Micro-channel heat exchanger and uniform defrosting control method thereof Download PDFInfo
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- CN111023629B CN111023629B CN201911265319.6A CN201911265319A CN111023629B CN 111023629 B CN111023629 B CN 111023629B CN 201911265319 A CN201911265319 A CN 201911265319A CN 111023629 B CN111023629 B CN 111023629B
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
Abstract
A micro-channel heat exchanger and a uniform defrosting control method thereof are provided, wherein the micro-channel heat exchanger comprises a liquid collecting pipe, a partition plate, a flat pipe, a fin and two flow regulating valves; the micro-channel heat exchanger judges that the micro-channel heat exchanger enters a defrosting mode through the temperature measured by the first temperature sensor, refrigerant flows into the upper part and the lower part of the heat exchanger through the two flow regulating valves respectively in the defrosting mode, so that the integral uniform defrosting of the heat exchanger is realized, the opening degrees of the two flow regulating valves are controlled through the control module by utilizing output signals of the two temperature sensors, and the uniform defrosting at a fixed point of the micro-channel heat exchanger is further ensured; in addition, the micro-channel heat exchanger judges that the defrosting mode is exited through output signals of the two temperature sensors; compared with the prior art, the micro-channel heat exchanger can solve the problems that the lower part of the traditional micro-channel heat exchanger is slower in defrosting and more residual water exists, the upper part and the lower part of the micro-channel heat exchanger are uniformly defrosted, the defrosting time is shortened, and the overall performance of the micro-channel heat exchanger is improved.
Description
Technical Field
The invention relates to the technical field of microchannel heat exchangers, in particular to a microchannel heat exchanger and a uniform defrosting control method thereof.
Background
Compared with the traditional finned tube heat exchanger, the microchannel heat exchanger has the advantages of high heat exchange efficiency, small volume, compact structure, small refrigerant charge, low production cost and the like, is used as a condenser of a refrigeration system in a large scale, but has the defects of high frosting speed, difficulty in removing defrosting water, long defrosting time, high capacity attenuation and the like when being used as evaporators of an air source heat pump and a cooling and heating type household air conditioner, and restricts the popularization and application of the microchannel heat exchanger on the heat pump and the cooling and heating type household air conditioner.
The conventional microchannel heat exchanger starts to frost from the lower part of the microchannel heat exchanger firstly under the frosting working condition, then a frost layer starts to grow from bottom to top, and the defrosting starts from the upper part of the microchannel heat exchanger from top to bottom, so that the frosting on the lower part of the microchannel heat exchanger is thicker, and when the defrosting is finished, more defrosting water is remained on the lower part of the microchannel heat exchanger, and the defrosting is uneven in the whole defrosting period.
Disclosure of Invention
Aiming at the problems of the micro-channel heat exchanger, the invention provides the micro-channel heat exchanger and the uniform defrosting control method thereof, the micro-channel heat exchanger judges to enter a defrosting mode through the temperature measured by a first temperature sensor, a refrigerant passes through two flow regulating valves in the defrosting mode to uniformly defrost the upper part and the lower part of the micro-channel heat exchanger, and the opening degrees of the two flow regulating valves are controlled through a control module C1 by using feedback signals of the temperatures measured by the two temperature sensors to ensure the uniform defrosting of the micro-channel heat exchanger; the microchannel heat exchanger judges that the defrosting mode is exited through feedback signals of the temperatures measured by the two temperature sensors, and controls the opening and closing of the two flow regulating valves through a control module C1. The invention can achieve the effect of uniform defrosting, shorten the defrosting time and improve the performance of the microchannel heat exchanger.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a micro-channel heat exchanger comprises a first liquid collecting pipe 04, a second liquid collecting pipe 06, a plurality of flat pipes 07 arranged between the first liquid collecting pipe 04 and the second liquid collecting pipe 06 and communicated with the first liquid collecting pipe 04 and the second liquid collecting pipe 06, and fins 08 arranged between the adjacent flat pipes; the first refrigerant branch channel of the refrigerant channel is 1/4-1/3 l away from the top end of the first liquid collecting pipe 041The first refrigerant branch channel is provided with a first flow regulating valve 01, and the second refrigerant branch channel of the refrigerant channel is 1/6-1/5 l away from the bottom end of the first liquid collecting pipe 041The first refrigerant branch channel is communicated with the second refrigerant branch channel, and a second flow regulating valve 02 is arranged on the second refrigerant branch channel; the first clapboard 03 is arranged in the middle of the first liquid collecting pipe 04, and the second clapboard 05 is arranged in the second liquid collecting pipe 06 away from the bottom end 1/5-1/4 l2Here, the first temperature sensor T1 is disposed apart from the first header pipe 045-10cm and apart from the bottom end 1/4 ~ 1/3l of the first header pipe 041On the flat tube 07, a second temperature sensor T2 is arranged on the lowermost flat tube at a distance from a second header 065-10 cm; the control module C1 is connected to the first and second temperature sensors T1 and T2 and the first and second flow control valves 01 and 02 for collecting signals from the first and second temperature sensors T1 and T2 and controlling the opening and closing of the first and second flow control valves 01 and 02, wherein l1Is the length of the first header pipe 04, /)2Is the length of the second header pipe 06, and1＝l2。
when the micro-channel heat exchanger enters a defrosting mode, a refrigerant flows through the first flow regulating valve 01 and the second flow regulating valve 02 to enter the micro-channel heat exchanger at the same time, the refrigerant entering the micro-channel heat exchanger from the first flow regulating valve 01 flows to the second liquid collecting pipe 06 through the flat pipe 07 to be converged, then reversely flows to the first liquid collecting pipe 04 through the flat pipe 07 and is converged with the refrigerant entering the micro-channel heat exchanger through the second flow regulating valve 02, then flows to the second liquid collecting pipe 06 through the flat pipe 07, and finally flows out of the micro-channel heat exchanger.
According to the uniform defrosting control method of the microchannel heat exchanger, a first temperature sensor T1 and a second temperature sensor T2 output signals to a control module C1, and the control module C1 adjusts the opening and closing of a first flow regulating valve 01 and a second flow regulating valve 02 according to control logic written in advance; with k1Represents the temperature value measured by the first temperature sensor T1 in k2Represents the temperature value measured by the second temperature sensor T2; the working modes of the micro-channel heat exchanger comprise a defrosting mode and a non-defrosting mode, and the specific control is as follows:
non-defrost mode:
the micro-channel heat exchanger starts to work, the first flow regulating valve 01 is set to be fully opened at the beginning, the second flow regulating valve 02 is set to be closed, a temperature detection signal is transmitted into the control module C1, and when the temperature is judged to be k1＞kn1During the operation, the opening degree of the valve of the micro-channel heat exchanger is kept unchanged, the micro-channel heat exchanger works in a non-defrosting mode, and the control module C1 monitors the temperature change every 30 s;
defrosting mode:
when the temperature is judged to be k1＜kn1In time, the micro-channel heat exchanger enters into defrostingMode in which the opening degree of the first flow rate adjustment valve 01 is adjusted to n1The opening degree of the second flow rate adjustment valve 02 is adjusted to n2The control module C1 monitors the temperature change every 5s when the temperature k is1＜kn2And k is2＜kn2While, keeping the valve opening constant, the control module C1 continues to monitor the change in temperature; when the temperature k is1＞kn2And k is2＞kn2Keeping the opening of the valve unchanged, and continuously monitoring the change of the temperature by the control module; when the temperature k is1＞kn2，k2＜kn2While, the first flow rate adjusting valve 01 is opened by an opening n1Decreasing Δ n, opening n of the second flow control valve 022Remaining unchanged, the control module C1 continues to monitor the change in temperature; when the temperature k is1＜kn2，k2＞kn2While, the first flow rate adjusting valve 01 is opened by an opening n1The opening n of the second flow regulating valve 02 is kept unchanged2Decreasing Δ n, the control module C1 continues to monitor the change in temperature; when the temperature k is1＜kn3Or k2＜kn3Meanwhile, the valve opening degree is kept at the current opening degree, and the control module C1 continues to monitor the temperature change; when the temperature k is1＞kn3And k is2＞kn3When the micro-channel heat exchanger is in the defrosting mode, the first flow regulating valve 01 is fully opened, and the second flow regulating valve 02 is closed;
wherein: n is1Opening degree, n, of first flow rate control valve 012Δ n is a reduced value of the valve opening degree, k, for the opening degree of the second flow rate adjustment valve 02n1Set temperature, k, for a microchannel heat exchanger to enter defrost moden2Temperature k for judging defrosting completion condition of microchannel heat exchangern3And (4) the set temperature for the micro-channel heat exchanger to exit the defrosting mode.
N is1、n2、Δn、kn1、kn2、kn3The values of (A) are as follows according to the value range of the micro-channel heat exchanger:
compared with the prior art, the invention has the following advantages:
1. the invention provides a defrosting mode for simultaneously defrosting the upper part and the lower part of a microchannel heat exchanger, which can play a role of uniformly defrosting, shorten the defrosting time and improve the performance of the microchannel heat exchanger.
2. The invention provides a feasible and effective control method, which can accurately control the micro-channel heat exchanger during defrosting, so that the micro-channel heat exchanger can defrost uniformly, and the problem that much defrosting water remains at the lower part of the micro-channel heat exchanger is solved.
Drawings
Fig. 1 is a schematic diagram of a microchannel heat exchanger and its uniform defrosting according to the present invention.
Fig. 2 is a logic diagram of a micro-channel heat exchanger and its uniform defrosting control according to the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, the microchannel heat exchanger of the invention comprises a first liquid collecting tube 04, a second liquid collecting tube 06, a plurality of flat tubes 07 arranged between the first liquid collecting tube 04 and the second liquid collecting tube 06 and communicated with the first liquid collecting tube 04 and the second liquid collecting tube 06, and fins 08 arranged between adjacent flat tubes; the first refrigerant branch channel of the refrigerant channel is 1/4-1/3 l away from the top end of the first liquid collecting pipe 041The first refrigerant branch channel is provided with a first flow regulating valve 01, and the second refrigerant branch channel of the refrigerant channel is 1/6-1/5 l away from the bottom end of the first liquid collecting pipe 041The first refrigerant branch channel is communicated with the second refrigerant branch channel, and a second flow regulating valve 02 is arranged on the second refrigerant branch channel; the first clapboard 03 is arranged in the middle of the first liquid collecting pipe 04, and the second clapboard 05 is arranged in the second liquid collecting pipe 06 away from the bottom end 1/5-1/4 l2Here, the first temperature sensor T1 is disposed apart from the first header pipe 045-10cm and apart from the bottom end 1/4 ~ 1/3l of the first header pipe 041On the flat pipe 07, a second temperature sensor T2 is arranged on the flat pipe at the lowest position and is separated from a second liquid collecting pipe 065-10 cm; control Module C1 and first temperatureThe degree sensor T1 and the second temperature sensor T2 are connected with the first flow regulating valve 01 and the second flow regulating valve 02 for collecting signals of the first temperature sensor T1 and the second temperature sensor T2 and controlling the opening and the switch of the first flow regulating valve 01 and the second flow regulating valve 02, wherein l1Is the length of the first header pipe 04, /)2Is the length of the second header pipe 06, and1＝l2。
when the micro-channel heat exchanger enters a defrosting mode, a refrigerant flows through the first flow regulating valve 01 and the second flow regulating valve 02 to enter the micro-channel heat exchanger at the same time, the refrigerant entering the micro-channel heat exchanger from the first flow regulating valve 01 flows to the second liquid collecting pipe 06 through the flat pipe 07 to be converged, then reversely flows to the first liquid collecting pipe 04 through the flat pipe 07 and is converged with the refrigerant entering the micro-channel heat exchanger through the second flow regulating valve 02, then flows to the second liquid collecting pipe 06 through the flat pipe 07, and finally flows out of the micro-channel heat exchanger.
As shown in fig. 2, the control method for uniform defrosting of the microchannel heat exchanger includes: the first temperature sensor T1 and the second temperature sensor T2 output signals to a control module C1, and the control module C1 adjusts the opening and closing of the first flow regulating valve 01 and the second flow regulating valve 02 according to pre-written control logic; with k1Represents the temperature value measured by the first temperature sensor T1 in k2Represents the temperature value measured by the second temperature sensor T2; the working modes of the micro-channel heat exchanger comprise a defrosting mode and a non-defrosting mode, and the specific control is as follows:
non-defrost mode:
the micro-channel heat exchanger starts to work, the first flow regulating valve 01 is set to be fully opened at the beginning, the second flow regulating valve 02 is set to be closed, a temperature detection signal is transmitted into the control module C1, and when the temperature is judged to be k1＞kn1During the operation, the opening degree of the valve of the micro-channel heat exchanger is kept unchanged, the micro-channel heat exchanger works in a non-defrosting mode, and the control module C1 monitors the temperature change every 30 s;
defrosting mode:
when the temperature is judged to be k1＜kn1At this time, the microchannel heat exchanger enters a defrost mode, at which time the first streamThe opening degree of the quantity control valve 01 is adjusted to n1The opening degree of the second flow rate adjustment valve 02 is adjusted to n2The control module C1 monitors the temperature change every 5s when the temperature k is1＜kn2And k is2＜kn2While, keeping the valve opening constant, the control module C1 continues to monitor the change in temperature; when the temperature k is1＞kn2And k is2＞kn2Keeping the opening of the valve unchanged, and continuously monitoring the change of the temperature by the control module; when the temperature k is1＞kn2，k2＜kn2While, the first flow rate adjusting valve 01 is opened by an opening n1Decreasing Δ n, opening n of the second flow control valve 022Remaining unchanged, the control module C1 continues to monitor the change in temperature; when the temperature k is1＜kn2，k2＞kn2While, the first flow rate adjusting valve 01 is opened by an opening n1The opening n of the second flow regulating valve 02 is kept unchanged2Decreasing Δ n, the control module C1 continues to monitor the change in temperature; when the temperature k is1＜kn3Or k2＜kn3Meanwhile, the valve opening degree is kept at the current opening degree, and the control module C1 continues to monitor the temperature change; when the temperature k is1＞kn3And k is2＞kn3When the micro-channel heat exchanger is in the defrosting mode, the first flow regulating valve 01 is fully opened, and the second flow regulating valve 02 is closed;
wherein: n is1Opening degree, n, of first flow rate control valve 012Δ n is a reduced value of the valve opening degree, k, for the opening degree of the second flow rate adjustment valve 02n1Set temperature, k, for a microchannel heat exchanger to enter defrost moden2Temperature k for judging defrosting completion condition of microchannel heat exchangern3And (4) the set temperature for the micro-channel heat exchanger to exit the defrosting mode.
N is1、n2、Δn、kn1、kn2、kn3The values of (A) are as follows according to the value range of the micro-channel heat exchanger:
Claims (3)
1. a uniform defrosting control method for a micro-channel heat exchanger comprises a first liquid collecting pipe (04), a second liquid collecting pipe (06), a plurality of flat pipes (07) which are arranged between the first liquid collecting pipe (04) and the second liquid collecting pipe (06) and communicated with the first liquid collecting pipe (04) and the second liquid collecting pipe (06), and fins (08) which are arranged between the adjacent flat pipes; the first refrigerant branch channel of the refrigerant channel is 1/4-1/3 l away from the top end of the first liquid collecting pipe (04)1The first refrigerant branch channel is provided with a first flow regulating valve (01), and the second refrigerant branch channel of the refrigerant channel is 1/6-1/5 l away from the bottom end of the first liquid collecting pipe (04)1The first refrigerant branch channel is communicated with the second refrigerant branch channel, and a second flow regulating valve (02) is arranged on the second refrigerant branch channel; the first clapboard (03) is arranged in the middle of the first liquid collecting pipe (04), and the second clapboard (05) is arranged in the second liquid collecting pipe (06) at a distance from the bottom end 1/5-1/4 l2The first temperature sensor (T1) is arranged 5-10cm away from the first header pipe (04) and 1/4-1/3 l away from the bottom end of the first header pipe (04)1On the flat pipe (07), a second temperature sensor (T2) is arranged on the flat pipe at the lowest position and is 5-10cm away from the second liquid collecting pipe (06); the control module (C1) is connected with the first temperature sensor (T1), the second temperature sensor (T2) and the first flow regulating valve (01) and the second flow regulating valve (02) and is used for collecting signals of the first temperature sensor (T1) and the second temperature sensor (T2) and controlling the opening and the switch of the first flow regulating valve (01) and the second flow regulating valve (02), wherein l1Is the length of the first collector tube (04) /)2Is the length of the second header pipe (06), and1＝l2；
the method is characterized in that: the uniform defrosting control method comprises the following steps: the first temperature sensor (T1) and the second temperature sensor (T2) output signals to a control module (C1), and the control module (C1) adjusts the opening and closing of the first flow regulating valve (01) and the second flow regulating valve (02) according to pre-written control logic; with k1Represents the temperature value measured by the first temperature sensor (T1) in k2Represents the temperature value measured by the second temperature sensor (T2); the operating mode of the microchannel heat exchanger comprisesThe defrosting mode and the non-defrosting mode are specifically controlled as follows:
non-defrost mode:
the micro-channel heat exchanger starts to work, the first flow regulating valve (01) is set to be fully opened at first, the second flow regulating valve (02) is closed, a temperature detection signal is transmitted into the control module (C1), and when the temperature is judged to be k1＞kn1During the operation, the opening degree of the valve is kept unchanged by the micro-channel heat exchanger, the micro-channel heat exchanger works in a non-defrosting mode, and the control module (C1) monitors the temperature change every 30 s;
defrosting mode:
when the temperature is judged to be k1＜kn1When the micro-channel heat exchanger enters a defrosting mode, the opening degree of the first flow regulating valve (01) is regulated to n1The opening degree of the second flow rate adjusting valve (02) is adjusted to n2The control module (C1) monitors the temperature change every 5s when the temperature k is higher than the predetermined value1＜kn2And k is2＜kn2While keeping the valve opening constant, the control module (C1) continues to monitor the change in temperature; when the temperature k is1＞kn2And k is2＞kn2Keeping the opening of the valve unchanged, and continuously monitoring the change of the temperature by the control module; when the temperature k is1＞kn2，k2＜kn2While the first flow rate regulating valve (01) is opened by an opening n1Decreasing Deltan, opening n of the second flow regulating valve (02)2Remaining unchanged, the control module (C1) continues to monitor the change in temperature; when the temperature k is1＜kn2，k2＞kn2While the first flow rate regulating valve (01) is opened by an opening n1The opening n of the second flow rate regulating valve (02) is kept unchanged2Decreasing Δ n, the control module (C1) continues to monitor the change in temperature; when the temperature k is1＜kn3Or k2＜kn3Meanwhile, the valve opening degree is kept at the current opening degree, and the control module (C1) continues to monitor the temperature change; when the temperature k is1＞kn3And k is2＞kn3When the micro-channel heat exchanger is in the defrosting mode, the first flow regulating valve (01) is fully opened, and the second flow regulating valve (02) is closed;
wherein: n is1First flow regulating valve(01) Opening degree of (n)2Is the opening degree of the second flow rate regulating valve (02), and is a reduced value of the valve opening degree, kn1Set temperature, k, for a microchannel heat exchanger to enter defrost moden2Temperature k for judging defrosting completion condition of microchannel heat exchangern3And (4) the set temperature for the micro-channel heat exchanger to exit the defrosting mode.
2. The uniform defrosting control method of a microchannel heat exchanger as set forth in claim 1, wherein: n is1、n2、Δn、kn1、kn2、kn3The values of (A) are as follows according to the value range of the micro-channel heat exchanger:
3. the uniform defrosting control method of a microchannel heat exchanger as set forth in claim 1, wherein: when the micro-channel heat exchanger enters a defrosting mode, a refrigerant flows through the first flow regulating valve (01) and the second flow regulating valve (02) to enter the micro-channel heat exchanger at the same time, the refrigerant entering the micro-channel heat exchanger from the first flow regulating valve (01) flows to the second liquid collecting pipe (06) through the flat pipe (07) to be converged, then reversely flows to the first liquid collecting pipe (04) through the flat pipe (07) to be converged with the refrigerant entering the micro-channel heat exchanger through the second flow regulating valve (02), flows to the second liquid collecting pipe (06) through the flat pipe (07), and finally flows out of the micro-channel heat exchanger.
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| CN111879035B (en) * | 2020-07-28 | 2021-05-28 | 西安交通大学 | Micro-channel evaporator and defrosting and re-frosting control method |
| CN112066623B (en) * | 2020-08-27 | 2021-07-27 | 西安交通大学 | Heating power variable defrosting device of air-cooled refrigerator and control method |
| CN115289720B (en) * | 2022-08-03 | 2023-07-28 | 西安交通大学 | Double-row micro-channel evaporator and working method thereof |
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| CN101387455A (en) * | 2008-09-02 | 2009-03-18 | Tcl集团股份有限公司 | Parallel flow air conditioner and defrosting control method thereof |
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| JP6115111B2 (en) * | 2012-12-12 | 2017-04-19 | ダイキン工業株式会社 | Heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130255301A1 (en) * | 2012-03-27 | 2013-10-03 | Guntner U.S., Llc | Hot Gas Defrost Condensate Pan |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387455A (en) * | 2008-09-02 | 2009-03-18 | Tcl集团股份有限公司 | Parallel flow air conditioner and defrosting control method thereof |
| JP6115111B2 (en) * | 2012-12-12 | 2017-04-19 | ダイキン工業株式会社 | Heat exchanger |
| CN204128254U (en) * | 2014-08-26 | 2015-01-28 | 特灵空调系统(中国)有限公司 | The coil defrost system of Air-Cooled Heat Pump Unit |
| CN104949318A (en) * | 2015-06-30 | 2015-09-30 | 广东美的制冷设备有限公司 | Heat exchanger, air conditioner system and heat exchange method |
| CN204787172U (en) * | 2015-06-30 | 2015-11-18 | 广东美的制冷设备有限公司 | Heat exchanger and air conditioning system |
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