Micro-channel heat exchanger heat pump system and working method thereof

Abstract

A kind of micro-channel heat exchanger heat pump system and its working method, the micro-channel heat exchanger heat pump system includes compressor, four-way reversing valve, indoor heat exchanger, micro-channel heat exchanger, 4 ball valves, 2 throttles;Micro-channel heat exchanger works when in frosting condition, there is the problem that frost rate is faster, heat exchange performance attenuates faster, in addition, in defrosting process, there is also the problem that defrosting water is more difficult to remove, and defrosting efficiency is low;The present application proposes a kind of micro-channel heat exchanger heat pump system and its working method, in frosting process, utilize the high-temperature refrigerant heat and compressor waste heat of indoor heat exchanger to heat low-temperature refrigerant, improve evaporation temperature, delay frost, in defrosting process, utilize the heat source provided by compressor waste heat, shorten defrosting time, improve defrosting efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to a micro-channel heat exchanger heat pump system technical field, and in particular to a micro-channel heat exchanger heat pump system and a working method thereof. BACKGROUND

[0002] The micro-channel heat exchanger has been widely used in the field of refrigeration and air conditioning due to high heat exchange efficiency, small volume, compact structure, small refrigerant charging amount, and low production cost. However, when the micro-channel heat exchanger works as an evaporator under the frosting condition, there is a problem of too fast frosting rate and too fast heat exchange performance decay. In addition, due to the compact structure of the micro-channel heat exchanger, it is difficult to remove the defrosting water during the defrosting process, resulting in too long defrosting time and low defrosting efficiency.

[0003] The two main reasons for the fast frosting of the micro-channel heat exchanger are air humidity and surface temperature. Changing the air humidity usually requires a high cost and is difficult to be applied in the field of heat pump air conditioning. Changing the surface temperature of the heat exchanger is an effective method for frost suppression. To increase the surface temperature of the heat exchanger, an additional heat source is usually needed to heat the refrigerant entering the evaporator. Similarly, to shorten the defrosting time and improve the defrosting efficiency, the most effective method is to increase the heat source during defrosting. The waste heat is generated during the operation of the compressor, and the full use of the waste heat can effectively improve the operating efficiency of the micro-channel heat exchanger heat pump system. SUMMARY

[0004] In view of the problems existing in the micro-channel heat exchanger heat pump system, the present application aims to provide a micro-channel heat exchanger heat pump system and a working method thereof. When the micro-channel heat exchanger works under the frosting condition, the high-temperature refrigerant from the indoor unit 03 is used to heat the low-temperature refrigerant in the first liquid collecting pipe 13, and then the waste heat of the compressor 01 is taken away through the heat exchange coil 12, and the low-temperature refrigerant in the first liquid collecting pipe 13 is added. Through the above process, the evaporation temperature can be effectively improved, and the frosting of the micro-channel heat exchanger can be delayed. In addition, during the defrosting process, the refrigerant from the micro-channel heat exchanger takes away the waste heat of the compressor 01 through the heat exchange coil 12, providing an additional heat source for the defrosting process, shortening the defrosting time, and improving the defrosting efficiency.

[0005] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0006] A kind of micro-channel heat exchanger heat pump system, including compressor 01, four-way reversing valve 02, compressor 01 exhaust port is connected with the first port 21 of four-way reversing valve, compressor 01 suction port is connected with the third port 23 of four-way reversing valve, the fourth port 24 of four-way reversing valve is connected with the left end of second liquid collecting pipe 16, the second port 22 of four-way reversing valve is connected with indoor heat exchanger 03, indoor heat exchanger 03 is connected with first ball valve 04 and first heat exchange tube 06 respectively, first heat exchange tube 06 is connected with second ball valve 05, heat exchange coil pipe 12 is wound on compressor 01 and one end is connected with first ball valve 04 and second ball valve 05 respectively, the other end is connected with second throttling valve 11 and second heat exchange tube 07 respectively, second heat exchange tube 07 is connected with third ball valve 08, third ball valve 08 is connected with first throttling valve 09, second throttling valve 11 and fourth ball valve 10, fourth ball valve 10 and first throttling valve 09 are connected with the left end of first liquid collecting pipe 13 respectively, and first heat exchange tube 06 and second heat exchange tube 07 are installed in the inside of first liquid collecting pipe 13;It further includes the plurality of flat tubes 14 being arranged between first liquid collecting pipe 13 and second liquid collecting pipe 16 and being communicated with first liquid collecting pipe 13 and second liquid collecting pipe 16, and the fin 15 being installed between adjacent flat tubes;Wherein first liquid collecting pipe 13, flat tube 14, fin 15 and second liquid collecting pipe 16 constitute micro-channel heat exchanger.

[0007] The working method of the micro-channel heat exchanger heat pump system, when the micro-channel heat exchanger works in frosting condition, high-temperature refrigerant from indoor heat exchanger 03 enters first heat exchange tube 06 to continue heat exchange, then passes through heat exchange coil pipe 12 to take away the waste heat of compressor, and then enters second heat exchange tube 07 to continue heat exchange, through the above process, the high-temperature heat of refrigerant at the outlet of indoor heat exchanger 03 and the waste heat generated during the operation of compressor 01 are fully utilized to heat the low-temperature refrigerant in first liquid collecting pipe 13, so as to improve the surface temperature of micro-channel heat exchanger, delay the growth of frost layer, and improve the heating performance of micro-channel heat exchanger heat pump system;

[0008] When the micro-channel heat exchanger works in defrosting condition, the refrigerant from the micro-channel heat exchanger enters heat exchange coil pipe 12 after passing through second throttling valve 11 to take away the waste heat generated during the operation of compressor 01, to provide additional heat source for defrosting process, and fully utilize the waste heat generated during the operation of compressor 01, to shorten the defrosting time and improve the defrosting efficiency.

[0009] Compared with the prior art, the present application has the following advantages:

[0010] 1、The present application provides a micro-channel heat exchanger heat pump system and its working method, which fully utilizes the high-temperature refrigerant heat source at the outlet of indoor heat exchanger and the waste heat of compressor to heat low-temperature refrigerant, improves the evaporation temperature, delays the frosting rate of micro-channel heat exchanger, and improves the heating performance of micro-channel heat exchanger heat pump system

[0011] 2. The application provides a micro-channel heat exchanger heat pump system and a working method thereof, which fully utilizes the waste heat of a compressor to provide a heat source for a defrosting process, shortens the defrosting time and improves the defrosting efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Fig. 2 is a refrigerant flow diagram of the micro-channel heat exchanger heat pump system in the defrosting condition.

[0013] Figure 2 Fig. 2 is a refrigerant flow diagram of the micro-channel heat exchanger heat pump system in the defrosting condition. DETAILED DESCRIPTION

[0014] The specific embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0015] As shown in Figure 1 , 2 A micro-channel heat exchanger heat pump system, which comprises a compressor 01, a four-way reversing valve 02, a first port 21 of the four-way reversing valve connected with an exhaust port of the compressor 01, a third port 23 of the four-way reversing valve connected with a suction port of the compressor 01, a fourth port 24 of the four-way reversing valve connected with a left end of a second liquid collecting pipe 16, a second port 22 of the four-way reversing valve connected with an indoor heat exchanger 03, the indoor heat exchanger 03 connected with a first ball valve 04 and a first heat exchange pipe 06 respectively, the first heat exchange pipe 06 connected with a second ball valve 05, a heat exchange coil 12 wound on the compressor 01 and connected with the first ball valve 04 and the second ball valve 05 at one end and connected with a second throttling valve 11 and a second heat exchange pipe 07 at the other end, the second heat exchange pipe 07 connected with a third ball valve 08, the third ball valve 08 connected with a first throttling valve 09, a second throttling valve 11 and a fourth ball valve 10, the fourth ball valve 10 connected with the first throttling valve 09 and the first liquid collecting pipe 13 at the left end respectively, the first heat exchange pipe 06 and the second heat exchange pipe 07 installed in the first liquid collecting pipe 13; further comprising a plurality of flat tubes 14 arranged between the first liquid collecting pipe 13 and the second liquid collecting pipe 16 and connected with the first liquid collecting pipe 13 and the second liquid collecting pipe 16, and fins 15 arranged between adjacent flat tubes; wherein the first liquid collecting pipe 13, the flat tubes 14, the fins 15 and the second liquid collecting pipe 16 constitute a micro-channel heat exchanger.

[0016] As shown in Figure 1As shown, when the microchannel heat exchanger operates under frosting conditions, the high-temperature refrigerant from the indoor heat exchanger 03 first enters the first heat exchange tube 06 for further heat exchange, then passes through the heat exchange coil 12 to remove the waste heat from the compressor, and then enters the second heat exchange tube 07 for further heat exchange. Through the above process, the high-temperature heat of the refrigerant at the outlet of the indoor heat exchanger 03 and the waste heat generated during the operation of the compressor 01 are fully utilized to heat the low-temperature refrigerant in the first liquid collection tube 13, thereby increasing the surface temperature of the microchannel heat exchanger, delaying the growth of the frost layer, and improving the heating performance of the microchannel heat exchanger heat pump system. The detailed working process of the heat pump system is as follows: The high-temperature exhaust gas from the compressor 01 first enters the four-way reversing valve 02, and then enters the indoor heat exchanger 03 for condensation and heat exchange, providing a heat source for the room. The high-temperature refrigerant from the indoor heat exchanger 03 enters the first heat exchange tube 06 for heat exchange. The refrigerant from the first heat exchange tube enters the heat exchange coil 12 to remove the waste heat generated by the compressor 01, and then enters the second heat exchange tube 07 for further condensation and heat exchange. The refrigerant from the second heat exchange tube 07 is throttled through the first throttling valve 09 to form a low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant then enters the first liquid collector 13 and evaporates and absorbs heat through the flat tube 14, and then enters the second liquid collector 16. The gaseous refrigerant from the second liquid collector 16 finally enters the compressor 01 for compression through the four-way reversing valve 02.

[0017] like Figure 2 As shown, when the microchannel heat exchanger operates under defrosting conditions, the refrigerant exiting the microchannel heat exchanger passes through the second throttling valve 11 and enters the heat exchange coil 12 to remove the waste heat generated during the operation of the compressor 01, providing an additional heat source for the defrosting process. This fully utilizes the waste heat generated during the operation of the compressor 01, shortening the defrosting time and improving defrosting efficiency. The detailed working process of the heat pump system is as follows: The high-temperature exhaust gas from the compressor 01 first enters the four-way reversing valve 02. The refrigerant exiting from the four-way reversing valve 02 then enters the second liquid collector 16. The high-temperature refrigerant passing through the second liquid collector 16 enters the flat tube 14 for defrosting, and then enters the first liquid collector 13. The liquid refrigerant exiting from the first liquid collector 13 is throttled into a low-temperature, low-pressure refrigerant after passing through the second throttling valve 11, and then enters the heat exchange coil 12 to remove the waste heat generated by the compressor 01. The refrigerant exiting from the heat exchange coil 12 enters the indoor heat exchanger 03 for evaporation and heat absorption, and then passes through the four-way reversing valve 02 back into the compressor 01.

Claims

1. A method for operating a microchannel heat exchanger heat pump system, characterized in that: The microchannel heat exchanger heat pump system includes a compressor (01) and a four-way reversing valve (02). The exhaust port of the compressor (01) is connected to the first port (21) of the four-way reversing valve, the suction port of the compressor (01) is connected to the third port (23) of the four-way reversing valve, the fourth port (24) of the four-way reversing valve is connected to the left end of the second liquid collection pipe (16), the second port (22) of the four-way reversing valve is connected to the indoor heat exchanger (03), the indoor heat exchanger (03) is connected to the first ball valve (04) and the first heat exchange tube (06), the first heat exchange tube (06) is connected to the second ball valve (05), the heat exchange coil (12) is wound around the compressor (01) and one end is connected to the first ball valve (04) and the second ball valve (05) respectively, and the other end is connected to the second throttle valve (11) and the second heat exchanger (05) respectively. The heat pipe (07) is connected, the second heat exchange pipe (07) is connected to the third ball valve (08), the third ball valve (08) is connected to the first throttle valve (09), the second throttle valve (11) is connected to the fourth ball valve (10), the fourth ball valve (10) and the first throttle valve (09) are respectively connected to the left end of the first liquid collection pipe (13), the first heat exchange pipe (06) and the second heat exchange pipe (07) are both installed inside the first liquid collection pipe (13); it also includes multiple flat tubes (14) set between the first liquid collection pipe (13) and the second liquid collection pipe (16) and connected to the first liquid collection pipe (13) and the second liquid collection pipe (16), and fins (15) installed between adjacent flat tubes; wherein the first liquid collection pipe (13), the flat tubes (14), the fins (15) and the second liquid collection pipe (16) constitute a microchannel heat exchanger; The working method is as follows: When the microchannel heat exchanger is working under the frosting condition, the high-temperature refrigerant from the indoor heat exchanger (03) first enters the first heat exchange tube (06) to continue heat exchange, and then passes through the heat exchange coil (12) to carry away the residual heat of the compressor, and then enters the second heat exchange tube (07) to continue heat exchange. Through the above process, the high-temperature heat of the refrigerant at the outlet of the indoor heat exchanger (03) and the residual heat generated during the operation of the compressor (01) are fully utilized to heat the low-temperature refrigerant in the first liquid collection tube (13), thereby increasing the surface temperature of the microchannel heat exchanger, delaying the growth of the frost layer, and improving the heating performance of the microchannel heat exchanger heat pump system. When the microchannel heat exchanger is working under defrosting conditions, the refrigerant coming out of the microchannel heat exchanger enters the heat exchange coil (12) after passing through the second throttle valve (11), carrying away the waste heat generated by the compressor (01) during operation, providing an additional heat source for the defrosting process, and making full use of the waste heat generated by the compressor (01) during operation, shortening the defrosting time and improving the defrosting efficiency.

Images