CN115371463A - Double-row micro-channel heat exchanger and control method thereof - Google Patents
Double-row micro-channel heat exchanger and control method thereof Download PDFInfo
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- CN115371463A CN115371463A CN202210930404.5A CN202210930404A CN115371463A CN 115371463 A CN115371463 A CN 115371463A CN 202210930404 A CN202210930404 A CN 202210930404A CN 115371463 A CN115371463 A CN 115371463A
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- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
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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
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
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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
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
Abstract
A double-row micro-channel heat exchanger and a control method thereof are disclosed, wherein the double-row micro-channel heat exchanger comprises four liquid collecting pipes, flat pipes, fins, two ball valves, two flow regulating valves and two temperature sensors; under the frosting working condition, when the double-row micro-channel heat exchanger works at full load, the refrigerant firstly enters the rear-row heat exchanger and then flows out of the front-row heat exchanger, and flows through all the flat tubes; under the frosting working condition, when the double-row micro-channel heat exchanger works at an intermediate load or a small load, the refrigerant only flows through the heat exchanger at the front row or the rear row and is switched to be used according to the frosting condition, and the frost can be melted only by air without extra defrosting operation, so that the performance of the micro-channel heat exchanger is improved; under the defrosting working condition, the purpose of uniform defrosting is achieved by adjusting the flow of the refrigerant entering the front row and the rear row, and the defrosting efficiency is improved.
Description
Technical Field
The invention relates to the technical field of micro-channel heat exchangers, in particular to a double-row micro-channel heat exchanger and a control method thereof.
Background
Microchannel heat exchangers have been widely used in the automotive air conditioning field due to their advantages of 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 when the microchannel heat exchanger is used as an evaporator, the problem that frosting speed is too high and defrosting water is difficult to remove exists, so that the popularization and application of the microchannel heat exchanger are inhibited.
When the micro-channel heat exchanger works under the frosting working condition, the windward side of the micro-channel heat exchanger is blocked by frost, so that the heat exchange area of the leeward side of the micro-channel heat exchanger is not effectively utilized, and therefore, the method for improving the frosting uniformity of the micro-channel heat exchanger is the most important method for improving the frosting performance of the micro-channel heat exchanger. The surface temperature of the fin is the most main reason for influencing the growth of the frost layer, and the growth of the frost layer can be effectively inhibited by increasing the surface temperature. In addition, when the microchannel heat exchanger works at an intermediate load or a small load, the refrigerant can meet the heat exchange requirement without flowing through all the flat tubes, and the refrigerant flowing through all the flat tubes can bring larger pressure drop and reduce the hydraulic performance of the heat exchanger. In addition, the micro-channel heat exchanger has serious uneven defrosting phenomenon in the defrosting process, so that the defrosting time is greatly prolonged, and the defrosting efficiency is reduced.
Disclosure of Invention
The invention aims to provide a double-row micro-channel heat exchanger and a control method thereof, aiming at solving the problems of the micro-channel heat exchanger in the prior art. In addition, when the microchannel heat exchanger works at a middle load or a small load, the microchannel heat exchanger can be divided into a front part and a rear part for use, when one part is frosted seriously, the other part is switched to work, and a frost layer can be melted through air, so that the double-row microchannel heat exchanger does not need to be subjected to extra defrosting operation, and the performance of the microchannel heat exchanger is improved. In addition, when the microchannel heat exchanger is in a defrosting condition, the aim of uniformly defrosting is fulfilled by controlling the flow of the refrigerant entering the front and rear heat exchangers.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a double-row micro-channel heat exchanger comprises a first liquid collecting pipe 01, a second liquid collecting pipe 02, a third liquid collecting pipe 05, a fourth liquid collecting pipe 06, a plurality of flat pipes 04 arranged between the first liquid collecting pipe 01 and the second liquid collecting pipe 02, between the third liquid collecting pipe 05 and the fourth liquid collecting pipe 06 and communicated with the first liquid collecting pipe 01, the second liquid collecting pipe 12, the third liquid collecting pipe 05 and the fourth liquid collecting pipe 06, fins 03 arranged between the adjacent flat pipes, a front-row micro-channel heat exchanger formed by the first liquid collecting pipe 01, the second liquid collecting pipe 02, the flat pipes 04 and the fins 03, and a rear-row micro-channel heat exchanger formed by the third liquid collecting pipe 05, the fourth liquid collecting pipe 06, the flat pipes 04 and the fins 03; the device comprises a first ball valve 07, a fourth liquid collecting pipe 06, a first flow regulating valve 08, a third liquid collecting pipe 05, a first ball valve 07, a second flow regulating valve 08, a second ball valve 10, a second liquid collecting pipe 02, a second flow regulating valve 09, a second ball valve 10 and a second flow regulating valve 09, wherein the first ball valve 07 and the second flow regulating valve 08 are connected with the rightmost end of the first liquid collecting pipe 01 respectively, the leftmost end of the second liquid collecting pipe 02 is connected, the leftmost end of the first liquid collecting pipe 09 is connected with the leftmost end of the first liquid collecting pipe 09, the second ball valve 10 and the second flow regulating valve 09 are connected through a pipeline, a first temperature sensor 11 is arranged on a flat pipe 04 of a front-row micro-channel heat exchanger, a second temperature sensor 12 is arranged on a flat pipe 04 of a rear-row micro-channel heat exchanger, the first temperature sensor 11 tests the surface temperature of the front-row micro-channel heat exchanger to be T1, the second temperature sensor 12 tests the surface temperature T2 of the rear-row micro-channel heat exchanger, and the temperature difference of the front-rear-row heat exchanger is recorded as delta T = T1-T2.
Under the frosting working condition, when the double-row microchannel heat exchanger works at full load, the refrigerant firstly enters the rear-row microchannel heat exchanger from the third liquid collecting pipe 05 and then enters the front-row microchannel heat exchanger from the first liquid collecting pipe 01, and the refrigerant is evaporated and exchanges heat with the rear-row microchannel heat exchanger, so that the temperature of the refrigerant entering the front-row microchannel heat exchanger is higher, the growth of frost is inhibited, the frost blockage of the front-row microchannel heat exchanger is delayed, the frosting uniformity of the front-row heat exchanger and the rear-row heat exchanger is improved, and the frosting performance of the double-row microchannel heat exchanger is improved.
Under the frosting working condition, when the double-row microchannel heat exchanger works at full load, when delta T is less than or equal to T3, the refrigerant enters the back row firstly and then flows out of the front row, at the moment, the first ball valve 07 and the second ball valve 10 are opened, the second flow regulating valve 09 is closed, the first flow regulating valve 08 is closed, when T3 is less than or equal to T4, the opening degree of the first flow regulating valve 08 is f1, and when T4 is less than delta T, the opening degree of the first flow regulating valve 08 is f2; the ranges of the above parameters are: t3=2 to 3 ℃, T4=5 to 6 ℃, f1= 20 to 30% of full opening, and f2= 60 to 80% of full opening. By adjusting the front and rear drainage flow, the temperature of the front and rear rows can be kept in a certain range, and the frosting of the front and rear rows is more uniform.
Under the frosting working condition, when the double-row micro-channel heat exchanger works at an intermediate load or a small load, the refrigerant only needs to flow through half of the area of the heat exchanger to meet the requirement, firstly, the first ball valve 07 and the second flow regulating valve 09 are opened, the first flow regulating valve 08 and the second ball valve 10 are closed, the refrigerant only flows through the rear-row heat exchanger, when T2 is less than or equal to T5, the first ball valve 07 and the second flow regulating valve 09 are closed, the first flow regulating valve 08 and the second ball valve 10 are opened, the refrigerant only flows through the front-row heat exchanger, the frost layer of the rear-row heat exchanger can be melted by the temperature of air, when T1 is less than or equal to T5, the first ball valve 07 and the second flow regulating valve 09 are opened, the first flow regulating valve 08 and the second ball valve 10 are closed, the refrigerant flows through the rear-row heat exchanger, T5= -12-10 ℃, the double-row micro-channel heat exchanger can be defrosted without additional frosting operation through the cycle switching process, and the performance of the double-row micro-channel heat exchanger is improved.
When the double-row micro-channel heat exchanger is in a defrosting condition, when delta T is less than or equal to T6, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 and the second flow regulating valve 09 are closed, refrigerant enters the front-row heat exchanger from the second liquid collecting pipe 02 and then enters the rear-row heat exchanger from the fourth liquid collecting pipe 06, when T6 is less than or equal to T7, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 is closed, the opening degree of the second flow regulating valve 09 is f3, when T7 is less than delta T, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 is closed, and the opening degree of the second flow regulating valve 09 is f4. The ranges of the above parameters are: t6= 2-4 ℃, T7= 5-7 ℃, f3= 30-40% of full opening, and f4= 50-70% of full opening. The double-row micro-channel heat exchanger can defrost more uniformly by adjusting the flow entering the front-row heat exchanger.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a double-row micro-channel heat exchanger, wherein a refrigerant enters a front row from a rear row and flows out, so that the surface temperature of the front row is higher, frost blockage on the windward side is delayed, and the frosting performance of the micro-channel heat exchanger is improved.
2. The invention provides a double-row micro-channel heat exchanger, which controls a flow path entering a front row heat exchanger and a rear row heat exchanger through the temperature difference of the front row micro-channel heat exchanger and the rear row micro-channel heat exchanger so as to achieve the purpose of uniform frosting.
3. The invention provides a double-row micro-channel heat exchanger, when the double-row micro-channel heat exchanger works under a middle load or a small load, the heat exchanger is divided into a front part and a rear part for use, when one part is seriously frosted, the other part is switched to work, the defrosting is carried out through air, extra defrosting operation is not needed, and the performance of the micro-channel heat exchanger is improved.
4. The invention provides a double-row micro-channel heat exchanger, which is characterized in that when double-row micro-channels are in a defrosting condition, the temperature of a front-row heat exchanger is used as control to adjust the flow of a refrigerant entering the front-row heat exchanger and the rear-row heat exchanger, so that the aim of uniformly defrosting is fulfilled.
Drawings
FIG. 1 is a schematic diagram of a refrigerant flow when the double-row microchannel heat exchanger of the present invention is operating at full load under frosting conditions.
FIG. 2 is a schematic diagram of the operation of a rear heat exchanger in the middle load or small load operation of a double-row microchannel heat exchanger according to the present invention under frosting conditions.
FIG. 3 is a schematic diagram of the operation of a front row heat exchanger during the operation of a double-row micro-channel heat exchanger under the frosting condition at an intermediate load or a small load.
Fig. 4 is a schematic flow chart of the refrigerant during defrosting operation of the double-row micro-channel heat exchanger according to the invention under the defrosting condition.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, 2, 3 and 4, the double-row microchannel heat exchanger according to the present invention comprises a first liquid collecting tube 01, a second liquid collecting tube 02, a third liquid collecting tube 05 and a fourth liquid collecting tube 06, a plurality of flat tubes 04 arranged between the first liquid collecting tube 01 and the second liquid collecting tube 02, and the third liquid collecting tube 05 and the fourth liquid collecting tube 06 and communicating the first liquid collecting tube 01 and the second liquid collecting tube 12, and the third liquid collecting tube 05 and the fourth liquid collecting tube 06, and a fin 03 installed between adjacent flat tubes, wherein the first liquid collecting tube 01, the second liquid collecting tube 02, the flat tubes 04 and the fin 03 constitute a front row microchannel heat exchanger, and the third liquid collecting tube 05, the fourth liquid collecting tube 06, the flat tubes 04 and the fin 03 constitute a rear row microchannel heat exchanger; the device comprises a first ball valve 07, a fourth liquid collecting pipe 06, a first flow regulating valve 08, a third liquid collecting pipe 05, a first ball valve 07, a second flow regulating valve 08, a second ball valve 10, a second liquid collecting pipe 02, a second flow regulating valve 09, a second ball valve 10 and a second flow regulating valve 09, wherein the first ball valve 07 and the second flow regulating valve 08 are connected with the rightmost end of the first liquid collecting pipe 01 respectively, the leftmost end of the second liquid collecting pipe 02 is connected, the leftmost end of the first liquid collecting pipe 09 is connected with the leftmost end of the first liquid collecting pipe 09, the second ball valve 10 and the second flow regulating valve 09 are connected through a pipeline, a first temperature sensor 11 is arranged on a flat pipe 04 of a front-row micro-channel heat exchanger, a second temperature sensor 12 is arranged on a flat pipe 04 of a rear-row micro-channel heat exchanger, the first temperature sensor 11 tests the surface temperature of the front-row micro-channel heat exchanger to be T1, the second temperature sensor 12 tests the surface temperature T2 of the rear-row micro-channel heat exchanger, and the temperature difference of the front-rear-row heat exchanger is recorded as delta T = T1-T2.
Under the frosting working condition, when the double-row micro-channel heat exchanger works at full load, as shown in figure 2, a refrigerant firstly enters the rear-row micro-channel heat exchanger from the third liquid collecting pipe 05 and then enters the front-row micro-channel heat exchanger from the first liquid collecting pipe 01, the refrigerant is evaporated and exchanges heat in the rear-row micro-channel heat exchanger, so that the temperature of the refrigerant entering the front-row micro-channel heat exchanger is higher, the growth of frost is inhibited, the frost blockage of the front-row micro-channel heat exchanger is delayed, the frosting uniformity of the front-row and rear-row heat exchangers is improved, and the frosting performance of the double-row micro-channel heat exchanger is improved.
Under the frosting working condition, when the double-row micro-channel heat exchanger works at full load, when delta T is less than or equal to T3, the refrigerant enters the rear row firstly and then flows out of the front row, at the moment, the first ball valve 07 and the second ball valve 10 are opened, the second flow regulating valve 09 is closed, the first flow regulating valve 08 is closed, when T3 is less than or equal to T4, the opening degree of the first flow regulating valve 08 is f1, and when T4 is less than delta T, the opening degree of the first flow regulating valve 08 is f2. The ranges of the above parameters are: t3=2 to 3 ℃, T4=5 to 6 ℃, f1= 20 to 30% of full opening, and f2= 60 to 80% of full opening. By adjusting the front and rear drainage flow, the temperature of the front and rear rows can be kept in a certain range, and the frosting of the front and rear rows is more uniform.
Under the frosting working condition, when the double-row micro-channel heat exchanger works at an intermediate load or a small load, the refrigerant only needs to flow through half of the area of the heat exchanger to meet the requirement, firstly, the first ball valve 07 and the second flow regulating valve 09 are opened, the first flow regulating valve 08 and the second ball valve 10 are closed, the refrigerant only flows through the back-row heat exchanger, as shown in fig. 2, when T2 is less than or equal to T5, the first ball valve 07 and the second flow regulating valve 09 are closed, the first flow regulating valve 08 and the second ball valve 10 are opened, the refrigerant only flows through the front-row heat exchanger, as shown in fig. 3, the frost layer of the back-row heat exchanger can be melted depending on the temperature of air, when T1 is less than or equal to T5, the first ball valve 07 and the second flow regulating valve 09 are opened, the first flow regulating valve 08 and the second flow regulating valve 10 are closed, the refrigerant flows through the back-row heat exchanger, and T5= -12 = -10 ℃, the double-row micro-channel heat exchanger can be defrosted without additional frosting operation through the cycle switching process, and the performance of the double-row micro-channel heat exchanger is improved.
When the double-row micro-channel heat exchanger is in a defrosting condition, as shown in fig. 4, when delta T is less than or equal to T6, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 and the second flow regulating valve 09 are closed, refrigerant enters the front-row heat exchanger from the second header pipe 02 and then enters the rear-row heat exchanger from the fourth header pipe 06, when T6 is less than or equal to T7, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 is closed, the opening degree of the second flow regulating valve 09 is f3, when T7 is less than delta T, the first ball valve 07 and the second ball valve 10 are opened, the first flow regulating valve 08 is closed, and the opening degree of the second flow regulating valve 09 is f4. The ranges of the above parameters are: t6= 2-4 ℃, T7= 5-7 ℃, f3= 30-40% of full opening, and f4= 50-70% of full opening. The double-row micro-channel heat exchanger can defrost more uniformly by adjusting the flow entering the front-row heat exchanger.
Claims (3)
1. A double-row micro-channel heat exchanger is characterized in that: the heat exchanger comprises a first liquid collecting pipe (01), a second liquid collecting pipe (02), a third liquid collecting pipe (05) and a fourth liquid collecting pipe (06), a plurality of flat pipes (04) which are arranged among the first liquid collecting pipe (01), the second liquid collecting pipe (02), the third liquid collecting pipe (05) and the fourth liquid collecting pipe (06) and communicated with the first liquid collecting pipe (01), the second liquid collecting pipe (12), the third liquid collecting pipe (05) and the fourth liquid collecting pipe (06), and fins (03) which are arranged between the adjacent flat pipes, wherein the first liquid collecting pipe (01), the second liquid collecting pipe (02), the flat pipes (04) and the fins (03) form a front-row micro-channel heat exchanger, and the third liquid collecting pipe (05), the fourth liquid collecting pipe (06), the flat pipes (04) and the fins (03) form a rear-row micro-channel heat exchanger; the rightmost end of the first ball valve (07) is connected with the rightmost end of the fourth liquid collecting pipe (06), the first flow regulating valve (08) is connected with the rightmost end of the third liquid collecting pipe (05), the first ball valve (07) and the second flow regulating valve (08) are respectively connected with the rightmost end of the first liquid collecting pipe (01), the second ball valve (10) is connected with the leftmost end of the second liquid collecting pipe (02), the second flow regulating valve (09) is connected with the leftmost end of the first liquid collecting pipe, the second ball valve (10) is connected with the second flow regulating valve (09) through a pipeline, the first temperature sensor (11) is arranged on a flat pipe (04) of the front-row micro-channel heat exchanger, the second temperature sensor (12) is arranged on a flat pipe (04) of the rear-row micro-channel heat exchanger, the first temperature sensor (11) tests that the surface temperature of the front-row micro-channel heat exchanger is T1, the second temperature sensor (12) tests that the surface temperature of the rear-row micro-channel heat exchanger is T2, and the temperature difference record of the front-row and rear-row heat exchangers is delta T = T1-T2.
2. The method of controlling a dual row microchannel heat exchanger as set forth in claim 1, wherein: under the frosting working condition, when the double-row micro-channel heat exchanger works at full load, a refrigerant firstly enters the rear-row micro-channel heat exchanger from the third liquid collecting pipe (05) and then enters the front-row micro-channel heat exchanger from the first liquid collecting pipe (01), and the refrigerant is evaporated and exchanges heat with the rear-row micro-channel heat exchanger, so that the temperature of the refrigerant entering the front-row micro-channel heat exchanger is higher, the growth of frost is inhibited, the frost blockage of the front-row micro-channel heat exchanger is delayed, the frosting uniformity of the front-row heat exchanger and the rear-row heat exchanger is improved, and the frosting performance of the double-row micro-channel heat exchanger is improved;
under the frosting working condition, when the double-row micro-channel heat exchanger works at an intermediate load or a small load, the refrigerant only needs to flow through half of the area of the heat exchanger to meet the requirement, firstly, the first ball valve (07) and the second flow regulating valve (09) are opened, the first flow regulating valve (08) and the second ball valve (10) are closed, the refrigerant only flows through the rear-row heat exchanger, when the T2 is less than or equal to T5, the first ball valve (07) and the second flow regulating valve (09) are closed, the first flow regulating valve (08) and the second ball valve (10) are opened, the refrigerant only flows through the front-row heat exchanger, the frost layer of the rear-row heat exchanger can be melted by the temperature of air, when the T1 is less than or equal to T5, the first ball valve (07) and the second flow regulating valve (09) are opened, the first flow regulating valve (08) and the second ball valve (10) are closed, the refrigerant flows through the rear-row heat exchanger, the T5= -12-10 ℃, the double-row micro-channel heat exchanger can be defrosted without additional frosting operation through the circulation switching process, and the double-row micro-channel heat exchanger frosting performance can be improved;
when the double-row micro-channel heat exchanger is in a defrosting condition, when delta T is less than or equal to T6, a first ball valve (07) and a second ball valve (10) are opened, a first flow regulating valve (08) and a second flow regulating valve (09) are closed, refrigerant enters the front-row heat exchanger from a second liquid collecting pipe (02) and then enters the rear-row heat exchanger from a fourth liquid collecting pipe (06), when T6 is less than or equal to T7, the first ball valve (07) and the second ball valve (10) are opened, the first flow regulating valve (08) is closed, the opening degree of the second flow regulating valve (09) is f3, when T7 is less than delta T, the first ball valve (07) and the second ball valve (10) are opened, the first flow regulating valve (08) is closed, and the opening degree of the second flow regulating valve (09) is f4; the ranges of the above parameters are: t6= 2-4 ℃, T7= 5-7 ℃, f3= 30-40% of full opening, f4= 50-70% of full opening; the double-row micro-channel heat exchanger can defrost more uniformly by adjusting the flow entering the front-row heat exchanger.
3. The method of claim 2 wherein the method of controlling a dual row microchannel heat exchanger comprises: under the frosting working condition, when the double-row microchannel heat exchanger works at full load, when delta T is less than or equal to T3, the refrigerant enters the rear row firstly and then flows out of the front row, at the moment, the first ball valve (07) and the second ball valve (10) are opened, the second flow regulating valve (09) is closed, the first flow regulating valve (08) is closed, when T3 is less than or equal to T4, the opening degree of the first flow regulating valve (08) is f1, and when T4 is less than delta T, the opening degree of the first flow regulating valve (08) is f2; the ranges of the above parameters are: t3=2 to 3 ℃, T4=5 to 6 ℃, f1= 20 to 30% of full opening, and f2= 60 to 80% of full opening. The front and rear rows of water are kept in a certain range by adjusting the front and rear water discharge amount, so that the front and rear rows of water are frosted more uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210930404.5A CN115371463A (en) | 2022-08-03 | 2022-08-03 | Double-row micro-channel heat exchanger and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210930404.5A CN115371463A (en) | 2022-08-03 | 2022-08-03 | Double-row micro-channel heat exchanger and control method thereof |
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| CN115371463A true CN115371463A (en) | 2022-11-22 |
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| CN202210930404.5A Pending CN115371463A (en) | 2022-08-03 | 2022-08-03 | Double-row micro-channel heat exchanger and control method thereof |
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| CN (1) | CN115371463A (en) |
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