CN115289720A - Double-row micro-channel evaporator and working method thereof - Google Patents
Double-row micro-channel evaporator and working method thereof Download PDFInfo
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- CN115289720A CN115289720A CN202210929103.0A CN202210929103A CN115289720A CN 115289720 A CN115289720 A CN 115289720A CN 202210929103 A CN202210929103 A CN 202210929103A CN 115289720 A CN115289720 A CN 115289720A
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A double-row micro-channel evaporator and a working method thereof are disclosed, wherein the double-row micro-channel evaporator comprises four liquid collecting pipes, flat pipes, fins, four ball valves, four distributing pipes, two distributors, two temperature sensors and two partition plates; under the frosting condition, when the double-row microchannel evaporator works at full load, the refrigerant firstly enters the rear-row heat exchanger and then flows out of the front-row heat exchanger, the refrigerant flows through all the flat pipes, when the double-row microchannel evaporator works at intermediate load or small load, the refrigerant only flows through half of the flat pipes, the evaporator is divided into two halves for use, and the use is switched according to the frosting condition. The double-row micro-channel evaporator provided by the invention can improve the frosting uniformity and improve the frosting performance; in addition, when the double-row microchannel evaporator works at a middle load or a small load, the two half heat exchangers are switched to be used, extra defrosting operation is not needed, defrosting can be performed through air, and the performance of the microchannel evaporator is improved.
Description
Technical Field
The invention relates to the technical field of microchannel evaporators, in particular to a double-row microchannel evaporator and a working method thereof.
Background
Microchannel heat exchangers have found wide application in the automotive air conditioning field due to their compact structure, high heat exchange efficiency, low refrigerant charge, and the like. With the rapid development of refrigeration technology, the microchannel heat exchanger is gradually used in the field of refrigeration air conditioners, but is mainly used as a condenser, because the microchannel heat exchanger works under the frosting working condition, the frosting speed is very high due to the compact structure and the slotting treatment of fins, and in addition, in the defrosting process, defrosting water is difficult to remove, so that the use of the microchannel heat exchanger is greatly limited.
When the microchannel evaporator works under the frosting working condition, the rapid frost blockage on the windward side is the reason for causing the performance of the microchannel evaporator to be rapidly attenuated, and most of the heat exchange area on the leeward side can not effectively work due to the frost blockage on the windward side, so that the method for improving the frosting uniformity of the microchannel evaporator is the most important method for improving the frosting performance of the microchannel evaporator. In addition, when the microchannel evaporator is in the middle load or the small load work, the refrigerant does not need to flow through all the flat tubes to meet the heat exchange requirement, and the refrigerant flows through all the flat tubes to bring larger pressure drop and reduce the water conservancy performance of the heat exchanger.
Disclosure of Invention
In order to solve the problems of the micro-channel evaporator in the prior art, the invention aims to provide a double-row micro-channel evaporator and a working method thereof. In addition, when the microchannel evaporator works at a middle load or a small load, the microchannel evaporator can be divided into two halves for use, when one half is frosted seriously, the other half is switched to work, and a frost layer can be melted through air, so that the double-row microchannel evaporator does not need to be subjected to extra defrosting operation, and the performance of the microchannel evaporator is improved.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a double-row micro-channel evaporator comprises a first liquid collecting pipe 13, a second liquid collecting pipe 15, a third liquid collecting pipe 05, a fourth liquid collecting pipe 09, a plurality of flat pipes 07 arranged between the first liquid collecting pipe 13 and the second liquid collecting pipe 15, and between the third liquid collecting pipe 05 and the fourth liquid collecting pipe 09 and communicated with the first liquid collecting pipe 13, the second liquid collecting pipe 15, the third liquid collecting pipe 05 and the fourth liquid collecting pipe 09, and fins 08 arranged between adjacent flat pipes, wherein the first liquid collecting pipe 13, the second liquid collecting pipe 15, the flat pipes 07 and the fins 08 form a front-row micro-channel evaporator, and the third liquid collecting pipe 05, the fourth liquid collecting pipe 09, the flat pipes 07 and the fins 08 form a rear-row micro-channel evaporator; the first partition 14 is arranged at the middle position of the first header pipe 13, and the second partition 06 is arranged at the middle position of the third header pipe 05; a first distribution pipe 47 is installed inside the first header pipe 13 and positioned at the right side of the first separator 14, a second distribution pipe 48 is also installed inside the first header pipe 13 and passes through the first separator 14, the first distribution pipe 47 has a length of L, the second distribution pipe 48 has a length of 2L, the first distribution pipe 47 is uniformly perforated along the pipe length direction, the second distribution pipe 48 is perforated only at the rear half part, and the perforated sections are all positioned at the left side of the first separator 14; the third distributing pipe 45 is arranged inside the third header pipe 05 and positioned on the left side of the second partition 06, the fourth distributing pipe 46 is also arranged inside the third header pipe 05 and penetrates through the second partition 06, the length of the third distributing pipe 45 is L, the length of the fourth distributing pipe 46 is 2L, the third distributing pipe 45 is uniformly perforated in the pipe length direction, the fourth distributing pipe 46 is only perforated in the rear half part, and the perforated sections are all positioned on the right side of the second partition 06; the first distributor 01 is respectively connected with a first ball valve 02 and a second ball valve 03, and the first ball valve 02 and the second ball valve 03 are respectively connected with a fourth distributing pipe 46 and a third distributing pipe 45; the inlet of the second dispenser 10 is connected to the rightmost side of the fourth header pipe 09, the second dispenser 10 is connected to the third ball valve 11 and the fourth ball valve 12, respectively, and the third ball valve 11 and the fourth ball valve 12 are connected to the first distribution pipe 47 and the second distribution pipe 48, respectively; a first temperature sensor 16 is mounted on the flat tube 07 of the front row microchannel evaporator and located on the left side of the first partition 14, and a second temperature sensor 17 is mounted on the flat tube 07 of the front row microchannel evaporator and located on the right side of the first partition 14.
In the working method of the double-row microchannel evaporator, under the frosting working condition, when the double-row microchannel evaporator works in a full load mode, refrigerant enters the rear row microchannel evaporator from the first ball valve 02 and the second ball valve 03 respectively, the third distribution pipe 45 and the fourth distribution pipe 46 simultaneously supply liquid to the front half part and the rear half part of the third liquid collecting pipe 05, then the refrigerant passes through the rear row microchannel evaporator and then enters the front row microchannel evaporator from the third ball valve 11 and the fourth ball valve 12 respectively, and the first distribution pipe 47 and the second distribution pipe 48 simultaneously supply liquid to the front half part and the rear half part of the first liquid collecting pipe 13; the refrigerant flows through all the flat tubes;
under the frosting working condition, when the double-row microchannel evaporator works at an intermediate load or a small load, firstly, the first ball valve 02 and the third ball valve 11 are opened, the second ball valve 03 and the fourth ball valve 12 are closed, refrigerant enters the fourth distributing pipe 46 through the first ball valve 02 and supplies liquid to the downstream part of the rear row microchannel heat exchanger, and after the refrigerant exits from the rear row microchannel evaporator, the refrigerant enters the first distributing pipe 47 through the third ball valve 11 and supplies liquid to the upstream part of the front row microchannel evaporator; when the temperature of the second temperature sensor 17 is lower than T1, the first ball valve 02 and the third ball valve 11 are closed, the second ball valve 03 and the fourth ball valve 12 are opened, the refrigerant enters the third distribution pipe 45 through the second ball valve 03 and supplies liquid to the upstream part of the rear row microchannel heat exchanger, and the refrigerant enters the second distribution pipe 48 through the fourth ball valve 12 after coming out of the rear row microchannel evaporator and supplies liquid to the downstream part of the front row microchannel evaporator; when the temperature of the first temperature sensor is lower than T1, the first ball valve 02 and the third ball valve 11 are opened, the second ball valve 03 and the fourth ball valve 12 are closed, and the above cyclic switching is sequentially performed; the temperature range of T1 is: -12 ℃ < T1< -8 ℃.
Under the frosting working condition, on the air side, air firstly flows through the front row microchannel evaporator and then flows through the rear row microchannel evaporator, and on the refrigerant side, refrigerant enters the rear row microchannel evaporator from the first distributor 01 and then flows out of the front row microchannel evaporator through the second distributor 10, so that the surface temperature of the front row microchannel evaporator is high, the surface temperature of the rear row microchannel evaporator is low, the frosting rate of the front row microchannel evaporator is inhibited, the frost blockage of the front row microchannel evaporator is delayed, the frosting uniformity of the microchannel evaporator is improved, and the frosting performance of the microchannel evaporator is improved; in addition, when the double-row microchannel evaporator works at an intermediate load or a small load, the refrigerant does not need to completely flow through all the flat pipes, the microchannel evaporator is split into two parts for use, when the frosting of the heat exchange area of the current half part is serious, the heat exchange area of the latter half part is switched to work, and the frost layer is melted through air, so that the double-row microchannel evaporator does not need to be subjected to extra defrosting operation, and the performance of the microchannel evaporator is improved.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a double-row micro-channel evaporator, wherein a refrigerant enters a front row from a rear row and flows out from the front row, so that the surface temperature of the front row is higher, the frost blockage of the windward side is delayed, and the frosting performance of the micro-channel evaporator is improved.
2. When the double-row microchannel evaporator works under an intermediate load or a small load, the refrigerant only flows through half of the flat tubes, so that the pressure drop of the refrigerant side is reduced, and the performance of the microchannel evaporator is improved.
3. The invention provides a double-row micro-channel evaporator, when the double-row micro-channel evaporator works at a middle load or a small load, the evaporator is divided into two halves for use, when one half is frosted seriously, the other half is switched to work, defrosting is carried out through air, extra defrosting operation is not needed, and the performance of the micro-channel evaporator is improved.
Drawings
FIG. 1 is a schematic refrigerant flow diagram for a dual row microchannel evaporator operating at full capacity in accordance with the present invention.
FIG. 2 is a schematic diagram of the operation of the latter half of the heat exchange area of the dual-row microchannel evaporator during medium load or small load operation.
FIG. 3 is a schematic diagram showing the operation of the first half heat exchange area of the dual-row microchannel evaporator during medium load or small load operation.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, 2 and 3, the double-row microchannel evaporator of the invention comprises a first liquid collecting pipe 13, a second liquid collecting pipe 15, a third liquid collecting pipe 05 and a fourth liquid collecting pipe 09, a plurality of flat pipes 07 arranged between the first liquid collecting pipe 13 and the second liquid collecting pipe 15, and between the third liquid collecting pipe 05 and the fourth liquid collecting pipe 09 and communicated with the first liquid collecting pipe 13 and the second liquid collecting pipe 15, and between the third liquid collecting pipe 05 and the fourth liquid collecting pipe 09, and fins 08 arranged between adjacent flat pipes, wherein the first liquid collecting pipe 13, the second liquid collecting pipe 15, the flat pipes 07 and the fins 08 form a front row microchannel evaporator, and the third liquid collecting pipe 05, the fourth liquid collecting pipe 09, the flat pipes 07 and the fins 08 form a rear row microchannel evaporator; the first partition 14 is arranged at the middle position of the first header pipe 13, and the second partition 06 is arranged at the middle position of the third header pipe 05; a first distribution pipe 47 is installed inside the first header pipe 13 and positioned at the right side of the first separator 14, a second distribution pipe 48 is also installed inside the first header pipe 13 and passes through the first separator 14, the first distribution pipe 47 has a length of L, the second distribution pipe 48 has a length of 2L, the first distribution pipe 47 is uniformly perforated along the pipe length direction, the second distribution pipe 48 is perforated only at the rear half part, and the perforated sections are all positioned at the left side of the first separator 14; the third distributing pipe 45 is arranged inside the third header pipe 05 and positioned on the left side of the second partition 06, the fourth distributing pipe 46 is also arranged inside the third header pipe 05 and penetrates through the second partition 06, the length of the third distributing pipe 45 is L, the length of the fourth distributing pipe 46 is 2L, the third distributing pipe 45 is uniformly perforated in the pipe length direction, the fourth distributing pipe 46 is only perforated in the rear half part, and the perforated sections are all positioned on the right side of the second partition 06; the first distributor 01 is respectively connected with a first ball valve 02 and a second ball valve 03, and the first ball valve 02 and the second ball valve 03 are respectively connected with a fourth distributing pipe 46 and a third distributing pipe 45; the inlet of the second distributor 10 is connected to the rightmost side of the fourth header pipe 09, the second distributor 10 is connected to the third ball valve 11 and the fourth ball valve 12, respectively, and the third ball valve 11 and the fourth ball valve 12 are connected to the first distribution pipe 47 and the second distribution pipe 48, respectively; a first temperature sensor 16 is mounted on the flat tube 07 of the front row microchannel evaporator and located on the left side of the first partition 14, and a second temperature sensor 17 is mounted on the flat tube 07 of the front row microchannel evaporator and located on the right side of the first partition 14.
Under the frosting condition, as shown in fig. 1, when the double-row microchannel evaporator works at full load, the refrigerant respectively enters the rear row microchannel evaporator from the first ball valve 02 and the second ball valve 03, the third distribution pipe 45 and the fourth distribution pipe 46 simultaneously supply liquid to the front half part and the rear half part of the third liquid collecting pipe 05, then the refrigerant respectively enters the front row microchannel evaporator from the third ball valve 11 and the fourth ball valve 12 after passing through the rear row microchannel evaporator, and the first distribution pipe 47 and the second distribution pipe 48 simultaneously supply liquid to the front half part and the rear half part of the first liquid collecting pipe 13; the refrigerant flows through all the flat tubes.
Under the frosting condition, when the double-row microchannel evaporator works at an intermediate load or a small load, as shown in fig. 2, firstly, the first ball valve 02 and the third ball valve 11 are opened, the second ball valve 03 and the fourth ball valve 12 are closed, the refrigerant enters the fourth distributing pipe 46 through the first ball valve 02 and supplies liquid to the downstream part of the rear row microchannel heat exchanger, and the refrigerant enters the first distributing pipe 47 through the third ball valve 11 after coming out of the rear row microchannel evaporator and supplies liquid to the upstream part of the front row microchannel evaporator; as shown in fig. 3, when the temperature of the second temperature sensor 17 is lower than T1, the first ball valve 02 and the third ball valve 11 are closed, the second ball valve 03 and the fourth ball valve 12 are opened, the refrigerant enters the third distribution pipe 45 through the second ball valve 03 and supplies the liquid to the upstream part of the rear row microchannel heat exchanger, and the refrigerant enters the second distribution pipe 48 through the fourth ball valve 12 after exiting from the rear row microchannel evaporator and supplies the liquid to the downstream part of the front row microchannel evaporator; when the temperature of the first temperature sensor is lower than T1, the first ball valve 02 and the third ball valve 11 are opened, the second ball valve 03 and the fourth ball valve 12 are closed, and the above cyclic switching is sequentially performed; the temperature range of T1 is: -12 ℃ < T1< -8 ℃.
Under the frosting working condition, on the air side, air flows through the front row of micro-channel evaporators firstly and then flows through the rear row of micro-channel evaporators, on the refrigerant side, refrigerant enters the rear row of micro-channel evaporators from the first distributor 01 and then flows out of the front row of micro-channel evaporators from the second distributor 10, so that the surface temperature of the front row of micro-channel evaporators is high, the surface temperature of the rear row of micro-channel evaporators is low, the frosting rate of the front row of micro-channel evaporators is inhibited, the frost blockage of the front row of micro-channel evaporators is delayed, the frosting uniformity of the micro-channel evaporators is improved, and the frosting performance of the micro-channel evaporators is improved. In addition, when the double-row microchannel evaporator works at an intermediate load or a small load, the refrigerant does not need to completely flow through all the flat pipes, the microchannel evaporator can be split into two halves for use at the moment, when the frosting of the heat exchange area of the current half part is serious, the heat exchange area of the latter half part is switched to for working, the frost layer can be melted through air, the double-row microchannel heat exchanger does not need to be subjected to extra defrosting operation, and the performance of the microchannel evaporator is improved.
Claims (3)
1. A double-row micro-channel evaporator is characterized in that: the evaporator comprises a first liquid collecting pipe (13), a second liquid collecting pipe (15), a third liquid collecting pipe (05) and a fourth liquid collecting pipe (09), a plurality of flat pipes (07) which are arranged among the first liquid collecting pipe (13), the second liquid collecting pipe (15), the third liquid collecting pipe (05) and the fourth liquid collecting pipe (09) and communicated with the first liquid collecting pipe (13), the second liquid collecting pipe (15), the third liquid collecting pipe (05) and the fourth liquid collecting pipe (09), and fins (08) arranged between the adjacent flat pipes, wherein the first liquid collecting pipe (13), the second liquid collecting pipe (15), the flat pipes (07) and the fins (08) form a front-row micro-channel evaporator, and the third liquid collecting pipe (05), the fourth liquid collecting pipe (09), the flat pipes (07) and the fins (08) form a rear-row micro-channel evaporator; the first clapboard (14) is arranged in the middle of the first liquid collecting pipe (13), and the second clapboard (06) is arranged in the middle of the third liquid collecting pipe (05); the first distribution pipe (47) is arranged in the first liquid collecting pipe (13) and is positioned at the right side of the first partition plate (14), the second distribution pipe (48) is also arranged in the first liquid collecting pipe (13) and penetrates through the first partition plate (14), the length of the first distribution pipe (47) is L, the length of the second distribution pipe (48) is 2L, the first distribution pipe (47) is uniformly perforated along the pipe length direction, the second distribution pipe (48) is only perforated at the rear half part, and the perforated sections are all positioned at the left side of the first partition plate (14); the third distributing pipe (45) is arranged in the third header pipe (05) and is positioned on the left side of the second partition plate (06), the fourth distributing pipe (46) is also arranged in the third header pipe (05) and penetrates through the second partition plate (06), the length of the third distributing pipe (45) is L, the length of the fourth distributing pipe (46) is 2L, the third distributing pipe (45) is uniformly perforated along the pipe length direction, the fourth distributing pipe (46) is only provided with holes in the rear half part, and the perforated sections are all positioned on the right side of the second partition plate (06); the first distributor (01) is respectively connected with a first ball valve (02) and a second ball valve (03), and the first ball valve (02) and the second ball valve (03) are respectively connected with a fourth distributing pipe (46) and a third distributing pipe (45); the inlet of the second distributor (10) is connected with the rightmost side of the fourth collecting pipe (09), the second distributor (10) is respectively connected with a third ball valve (11) and a fourth ball valve (12), and the third ball valve (11) and the fourth ball valve (12) are respectively connected with a first distributing pipe (47) and a second distributing pipe (48); the first temperature sensor (16) is arranged on the flat pipe (07) of the front row of microchannel evaporators and is positioned on the left side of the first clapboard (14), and the second temperature sensor (17) is arranged on the flat pipe (07) of the front row of microchannel evaporators and is positioned on the right side of the first clapboard (14).
2. The method of operating a dual-row microchannel evaporator as set forth in claim 1, wherein: under the frosting condition, when the double-row micro-channel evaporator works at full load, refrigerant respectively enters a rear-row micro-channel evaporator from a first ball valve (02) and a second ball valve (03), a third distributing pipe (45) and a fourth distributing pipe (46) simultaneously supply liquid to the front half part and the rear half part of a third liquid collecting pipe (05), then the refrigerant respectively enters the front-row micro-channel evaporator from a third ball valve (11) and a fourth ball valve (12) after passing through the rear-row micro-channel evaporator, and a first distributing pipe (47) and a second distributing pipe (48) simultaneously supply liquid to the front half part and the rear half part of a first liquid collecting pipe (13); the refrigerant flows through all the flat tubes;
under the frosting condition, when the double-row microchannel evaporator works under the intermediate load or the small load, firstly, a first ball valve (02) and a third ball valve (11) are opened, a second ball valve (03) and a fourth ball valve (12) are closed, refrigerant enters a fourth distributing pipe (46) through the first ball valve (02) and supplies liquid to the downstream part of the rear-row microchannel heat exchanger, and after the refrigerant exits from the rear-row microchannel evaporator, the refrigerant enters a first distributing pipe (47) through the third ball valve (11) and supplies liquid to the upstream part of the front-row microchannel evaporator; when the temperature of the second temperature sensor (17) is lower than T1, the first ball valve (02) and the third ball valve (11) are closed, the second ball valve (03) and the fourth ball valve (12) are opened, the refrigerant enters the third distribution pipe (45) through the second ball valve (03) and is supplied to the upstream part of the rear-row micro-channel heat exchanger, and the refrigerant enters the second distribution pipe (48) through the fourth ball valve (12) after coming out of the rear-row micro-channel evaporator and is supplied to the downstream part of the front-row micro-channel evaporator; when the temperature of the first temperature sensor is lower than T1, the first ball valve (02) and the third ball valve (11) are opened, the second ball valve (03) and the fourth ball valve (12) are closed, and the above circulation switching is sequentially carried out; the temperature range of T1 is: -12 ℃ < T1< -8 ℃.
3. The working method of the double-row micro-channel evaporator as claimed in claim 2, wherein in the frosting condition, air flows through the front micro-channel evaporator firstly on the air side and then flows through the rear micro-channel evaporator, and on the refrigerant side, the refrigerant enters the rear micro-channel evaporator from the first distributor (01) and then flows out of the front micro-channel evaporator from the second distributor (10), which makes the surface temperature of the front micro-channel evaporator high and the surface temperature of the rear micro-channel evaporator low, inhibits the frosting rate of the front micro-channel evaporator, delays the frost blocking of the front micro-channel evaporator, enhances the frosting uniformity of the micro-channel evaporator, and improves the frosting performance of the micro-channel evaporator; in addition, when the double-row microchannel evaporator works at an intermediate load or a small load, the refrigerant does not need to completely flow through all the flat pipes, the microchannel evaporator is split into two parts for use, when the frosting of the heat exchange area of the current half part is serious, the heat exchange area of the latter half part is switched to work, and the frost layer is melted through air, so that the double-row microchannel evaporator does not need to be subjected to extra defrosting operation, and the performance of the microchannel evaporator is improved.
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| CN115289720B CN115289720B (en) | 2023-07-28 |
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| DE102012110702A1 (en) * | 2012-11-08 | 2014-05-08 | Audi Ag | Heat exchanger i.e. double flow heat exchanger, for refrigerant circuit of air conditioner of motor vehicle, has dividing unit dividing internal volume of collector pipes that are shiftable in independent regions |
| DE102012222620A1 (en) * | 2012-12-10 | 2014-06-12 | Bayerische Motoren Werke Aktiengesellschaft | Gas cooling device for use in air conditioning apparatus of motor car, has extraction unit over which fluid emerges from device, and switching unit changing heat exchanger surface, over which fluid flows |
| US20180023872A1 (en) * | 2015-02-27 | 2018-01-25 | Denso Corporation | Refrigerant evaporator |
| CN206478898U (en) * | 2017-01-17 | 2017-09-08 | 特灵空调系统(中国)有限公司 | A kind of dual system micro-channel heat exchanger and double back pipeline refrigeration system |
| CN111023629A (en) * | 2019-12-11 | 2020-04-17 | 西安交通大学 | Micro-channel heat exchanger and uniform defrosting control method thereof |
| CN111879035A (en) * | 2020-07-28 | 2020-11-03 | 西安交通大学 | Micro-channel evaporator and defrosting and re-frosting control method |
| CN114812016A (en) * | 2022-05-20 | 2022-07-29 | 西安交通大学 | Micro-channel evaporator and working method thereof |
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