CN115235145A - Heat pump system with sleeve pipe fin type heat exchanger - Google Patents
Heat pump system with sleeve pipe fin type heat exchanger Download PDFInfo
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- CN115235145A CN115235145A CN202210865726.6A CN202210865726A CN115235145A CN 115235145 A CN115235145 A CN 115235145A CN 202210865726 A CN202210865726 A CN 202210865726A CN 115235145 A CN115235145 A CN 115235145A
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- 239000007788 liquid Substances 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000012530 fluid Substances 0.000 claims description 48
- 238000005452 bending Methods 0.000 claims description 4
- 230000002528 anti-freeze Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 22
- 239000000203 mixture Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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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
- F28F1/24—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 transversely
- F28F1/32—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 transversely the means having portions engaging further tubular elements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a heat pump system with a sleeve finned heat exchanger, which comprises a plurality of compressors, a four-way valve, a throttling element, two sleeve finned heat exchangers and the like, wherein fins are arranged on the outer side of a sleeve of each sleeve finned heat exchanger, working medium or liquid flow channels are arranged on the inter-pipe side and the inner pipe side of each sleeve, one or more working medium flow channels are respectively arranged on the working medium or liquid flow channels, one respective working medium flow channel is connected with each compressor, the four-way valve and the throttling element are connected into an independent heat pump loop and are filled with a proper amount of working medium, and the liquid flow channels are communicated with a configured external pipeline. The working medium in the heat pump system exchanges heat with water and air simultaneously, the functions of supplying heat and supplying domestic hot water are integrated in one set of device, the manufacturing cost and the installation space are effectively reduced, more than two heat pump loops can be formed, and the energy efficiency ratio of the heat pump under the working condition of large heat exchange temperature difference is effectively improved.
Description
Technical Field
The invention mainly relates to the technical field of heat pump systems for building heat supply and hot water supply, in particular to a finned heat exchanger with a sleeve and a heat pump system thereof, and belongs to the technical field of heat pumps.
Background
District heating systems are central heating networks that distribute heat from a central source to users in a unified manner, and are used to solve heat demand problems in personal, residential, commercial heating, and industrial processes. In order to save energy and reduce the temperature of regional heating once, the temperature of hot water supplied by a third generation of regional heating system widely used at present is about 90 ℃; in order to further recycle low-and-medium waste heat resources such as boiler exhaust smoke and the like to achieve the purposes of energy conservation and emission reduction, people always research or widely popularize the fourth-generation regional heat supply system after 21 st century, the temperature of hot water supplied by the system can be reduced to 70 ℃ or lower to 50 ℃, the heat loss of the system is greatly reduced, and the heat supply efficiency is improved. However, the fourth generation district heating system can only directly heat after the heating temperature is reduced, and cannot provide domestic hot water required for bathing and the like through a heat exchange mode. In recent years, driven by the "dual carbon" goal, fifth generation district heating systems have been proposed, i.e., ultra low temperature district heating systems, where the supply water temperature is below 50 ℃, and may even be as low as 25 ℃, which can make full use of low grade heat sources that have been difficult to utilize, such as: solar energy, environmental heat sources, data center waste heat, process cooling water, and the like. Compared to the fourth generation system, the fifth generation system is characterized as follows: 1) The water supply of the heat supply network cannot be directly used for heating, and in addition, the temperature difference between heating and hot water supply is large, and the randomness of the requirement of domestic hot water is strong, so two sets of temperature-increasing heat pumps are required to be arranged; 2) The heat supply network can refrigerate at the same time, the waste heat generated in a centralized way during refrigeration can be utilized, and the waste heat can also be dissipated in a centralized way by equipment such as a cooling tower and the like. Therefore, for the fifth generation system, the advantages of energy conservation, emission reduction, pipe network cost saving and the like are very obvious, and the problems caused by the obvious advantages are also obvious, for example, a user configures two sets of temperature increasing systems to greatly increase the cost and the installation space, and when heating is carried out in the process of preparing domestic hot water or in cold weather, the temperature rise of a heat pump is large, namely the heat exchange temperature difference is large, and the energy efficiency ratio of the heat pump is seriously reduced.
In order to solve the problems of the heating heat pump of the district heating system, the technical scheme of the invention is designed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a finned heat exchanger with a sleeve and a heat pump system thereof, wherein water and air exchange heat with a working medium of the heat pump at the same time, and the finned heat exchanger with the sleeve and the heat pump system thereof have compact structures and obviously improved energy efficiency ratios. The invention designs the sleeve finned heat exchanger, the working medium can exchange heat with water and air at the same time, and two temperature increasing systems of a heating heat pump and a domestic hot water heat pump can be integrated into a set of device, so that the problems of high manufacturing cost and large installation size caused by separate arrangement of the heating heat pump and the domestic hot water heat pump are solved; the sleeve finned heat exchanger is provided with more than two working medium flow paths, and the working medium flow paths and other parts of the heat pump form more than two heat pump loops, so that the heat exchange temperature difference born by each loop is reduced, and the problem of low energy efficiency ratio of the heat pump under the working condition of large temperature rise is solved.
In order to achieve the above-mentioned object of the invention, the technical solution of the invention is realized by the following modes:
a heat exchanger with sleeve pipe fins and a heat pump system thereof are composed of a plurality of compressors 1, four-way valves 2, throttling elements 3, two sleeve pipe fin type heat exchangers and the like; fins are arranged on the outer side of a sleeve of the sleeve fin type heat exchanger, and working medium or liquid flow passages are arranged on the inter-tube side and the inner tube side of the sleeve; the sleeve finned heat exchanger is respectively provided with one or more working medium flow paths and liquid flow paths, and each working medium or liquid flow path is converged to the inlet and outlet collecting pipes of the sleeve finned heat exchanger; a working medium flow path of each of the two sleeve finned heat exchangers is connected with the compressor 1, the four-way valve 2 and the throttling element 3 through an inlet collecting pipe and an outlet collecting pipe of the two sleeve finned heat exchangers to form an independent heat pump loop, and the heat pump loop is filled with a proper amount of working medium; the number of working medium flow paths arranged on the two sleeve tube fin type heat exchangers is the same as that of heat pump loops formed correspondingly, and the liquid flow paths are communicated with a configured liquid pipeline through an inlet collecting pipe and an outlet collecting pipe of the liquid flow paths.
The two sleeve finned heat exchangers, namely the sleeve with the two sleeve finned heat exchangers, comprise a first sleeve finned heat exchanger 4 and a second sleeve finned heat exchanger 5; the first sleeve finned heat exchanger 4 is provided with two working medium flow paths and a liquid flow path, and comprises an outer pipe 401, an inner pipe 402, an inner pipe bent pipe 403, an outer pipe bent pipe A404, an upper liquid collecting pipe 405, a lower liquid collecting pipe 414, fins 406, a first working medium flow path upper collecting pipe 407, a lower working medium flow path collecting pipe 416, a right frame 408, an upper frame 409, an outer pipe bent pipe B410, a left frame 411, a lower frame 412, a second working medium flow path lower collecting pipe 413, an upper collecting pipe 415 and the like, and the structure thereof is as follows: the outer tubes 401 are arranged into a tube array according to a certain rule, and a plurality of fins 406 are connected outside the outer tubes 401 in series; the tube array of the outer tube 401 is supported between the left frame 411 and the right frame 408 and tightly connected together; an inner pipe 402 is prefabricated into a U-shaped pipe and penetrates into an outer pipe 401 to form a sleeve, and an outer pipe bent pipe B410 is sleeved into a U-shaped pipe bending part of the inner pipe 402 in advance; an inner pipe 402 of the opening part of the U-shaped pipe penetrates through an elbow pipe A404 of the outer pipe; the outer pipe elbow A404 and the outer pipe elbow B410 connect the outer pipe 401 into a plurality of branches according to the required rules, and the branches are respectively collected in an upper collecting pipe 407 and a lower collecting pipe 416 of the first working medium flow path and an upper collecting pipe 415 and a lower collecting pipe 413 of the second working medium flow path; the inner pipe elbow 403 connects the inner pipes 402 into a plurality of branches according to the required rules and collects the branches in the upper liquid header 405 and the lower liquid header 414; upper frame 409 and upper frame 412 are connected to right frame 408 and left frame 411, respectively, and constitute a mounting frame. The composition and the structure of the second sleeve fin type heat exchanger 5 are similar or similar to those of the sleeve fin type heat exchanger 4.
The utility model provides a take in two heat pump circuit of sleeve pipe, by first compressor 1A and second compressor 1B, first cross valve 2A and second cross valve 2B, first throttling element 3A and second throttling element 3B, first sleeve pipe finned heat exchanger 4, second sleeve pipe finned heat exchanger 5, distributor a6, distributor B7, distributor c8, distributor d9, fan A10 and fan B11 etc. constitute. A fan A10 and a fan B11 are arranged on the fin sides of the first sleeve finned heat exchanger 4 and the second sleeve finned heat exchanger 5, and a first working medium flow path of the first sleeve finned heat exchanger 4 and a second working medium flow path of the second sleeve finned heat exchanger 5 are respectively connected with a first compressor 1A, a first four-way valve 2A and a first throttling element 3A to form a heat pump loop A after passing through a distributor a6 and a distributor d 9; a second working medium flow path of the first sleeve finned heat exchanger 4 and a first working medium flow path of the second sleeve finned heat exchanger 5 respectively pass through a distributor B7 and a distributor c8 and then are connected with a second compressor 1B, a second four-way valve 2B and a second throttling element 3B to form a heat pump loop B; the first and second finned tube exchangers 4 and 5 are provided with one or two liquid flow paths, and the liquid flow paths may be the same or different.
A sleeve with sleeve fin type heat exchanger and its heat pump system, its sleeve of the finned heat exchanger of the sleeve can be the tube sleeve fin type, tube roll fin type or tube around fin type, etc. suitable for forcing the structure of convection current or natural convection current; the fins can be omitted, the outer tubes can be formed by arranging single tubes regularly and then connecting the single tubes into a flow path by using bent tubes, the outer tubes can also be formed by processing the single tubes into U-shaped tubes or S-shaped tubes and then connecting the single tubes or the S-shaped tubes into the flow path by using the bent tubes, the inner tubes arranged in the finned tubes can be formed by single tubes or a plurality of tubes, and the connection mode of the two ends of the inner tubes is suitable for the connection mode of the finned tubes.
The flow path arrangement of the two sleeve pipe fin type heat exchangers can be the same or different.
A finned heat exchanger with sleeve tube and its heat pump system features that its four-way valve can be omitted, its throttle element can be throttle tube, throttle hole, throttle valve or expansion valve, and its compressor can be independent compressor or compressor cylinder with independent air sucking and exhausting functions.
An inner tube and an inter-tube flow passage of the sleeve finned heat exchanger can respectively carry liquid and working medium, and can also respectively carry the working medium and the liquid; the working medium is R134a, R410A, R32, R290 or R600A which meets the requirement of environmental protection, the fluid can be water, antifreeze or synthetic fluid, etc., the working medium used by different heat pump circuits can be the same or different, and the fluid used by different liquid flow paths can be the same or different.
In a first sleeve finned heat exchanger 4, an outer pipe 401 can be prefabricated into a U-shaped pipe, an outer pipe bent pipe B410 can be omitted, the opening part of the U-shaped pipe of an inner pipe 402 penetrates through the U-shaped bent part of the outer pipe 401, and the other end of the outer pipe 401 penetrates through an outer pipe bent pipe A404.
The distributor of the finned heat exchanger with casing pipe and its heat pump system may be one assembly comprising four two-way valves or one-way valves or two three-way valves connected in the flow direction of the working medium.
For the finned tube heat exchanger with the sleeve and the heat pump system thereof, working media and water can flow through the inter-tube channel and the inner tube channel of the sleeve of the finned tube heat exchanger, air can flow through the side of the fin, so that the working media and the water and the air can exchange heat simultaneously, two sets of temperature-increasing heat pump systems for heating and supplying domestic hot water can be integrated into one set of device, and the manufacturing cost and the installation space of the temperature-increasing heat pump can be effectively reduced; the sleeve finned heat exchanger is provided with two or more working medium flow paths, and forms more than two heat pump loops with other parts of the heat pump, each loop can be selected and matched with proper working medium and bear the total temperature rise of the heat pump together, so that the heat exchange temperature difference borne by each loop can be reduced, the energy efficiency ratio of the heat pump is effectively improved, in addition, the heat pump adjusts the number of the loops of the heat pump according to the heating requirement, namely, the heat pump needs to operate in a small single loop and a large number of loops, and the annual power consumption of the heat pump can be effectively reduced.
Drawings
The invention is further described with reference to the accompanying drawings and the specific embodiments.
FIG. 1 is a system diagram according to an embodiment of the present invention.
Fig. 2 is a front view of a sleeve fin heat exchanger according to an embodiment of the present invention.
Fig. 3 is a right side view of a tube and fin heat exchanger according to an embodiment of the present invention.
Fig. 4 is a left side view of the sleeve fin type heat exchanger according to the first embodiment of the invention.
FIG. 5 is a system diagram of a second embodiment of the present invention.
Fig. 6 is a front view of a two-tube finned heat exchanger according to an embodiment of the present invention.
Fig. 7 is a right side view of a two-tube finned heat exchanger according to an embodiment of the present invention.
FIG. 8 is a system diagram of an embodiment of the present invention.
Fig. 9 is a front view of a three-tube finned heat exchanger according to an embodiment of the present invention.
Fig. 10 is a right side view of a three-tube finned heat exchanger according to an embodiment of the present invention.
FIG. 11 is a diagram of a system according to an embodiment of the present invention.
Fig. 12 is a front view of a four-tube finned heat exchanger according to an embodiment of the present invention.
Fig. 13 is a right side view of a four-tube finned heat exchanger according to an embodiment of the present invention.
In the figure: 1A, 1B-compressor, 2A, 2B-four-way valve, 3A, 3B-throttling element, 4-fluid a sleeve fin heat exchanger, 5-fluid B sleeve fin heat exchanger, 6-distributor a, 7-distributor B, 8-distributor c, 9-distributor d, 10-fan a, 11-fan B.
The first tube-fin heat exchanger 4 for fluid a is constructed as follows: 401-outer tube, 402-inner tube, 403-inner tube elbow, 404-outer tube elbow a, 405-liquid upper header, 406-fin, 407-working medium flow path one upper header, 408-right frame, 409-upper frame, 410-outer tube elbow B, 411-left frame, 412-lower frame, 413-working medium flow path two lower header, 414-liquid lower header, 415-working medium flow path two upper header, 416-working medium flow path one lower header, 417-liquid upper header, 418-liquid middle lower header.
The second tube fin heat exchanger 5 of fluid B is constructed as follows: 501-outer pipe, 502-inner pipe, 503-inner pipe elbow, 504-outer pipe elbow a, 505-liquid upper header, 506-fin, 507-working medium flow path one upper header, 508-right frame, 509-upper frame, 510-outer pipe elbow B, 511-left frame, 512-lower frame, 513-working medium flow path two lower header, 514-liquid lower header, 515-working medium flow path two upper header, 516-working medium flow path one lower header, 517-liquid upper header, 518-liquid middle lower header.
The valve formed by the distributor a6 is as follows: 61-upper valve a, 62-middle upper valve a, 63-middle lower valve a, 64-lower valve a.
The distributor b7 constitutes a valve as follows: 71-upper valve b, 72-middle upper valve b, 73-middle lower valve b, 74-lower valve b.
The distributor c8 constitutes the valve as follows: 81-upper valve c, 82-middle upper valve c, 83-middle lower valve c, 84-lower valve c.
The valve formed by the distributor d9 is as follows: 91-upper valve d, 92-upper valve d, 93-middle lower valve d, 94-lower valve d.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example one
Referring to fig. 1, the embodiment is a heat pump system using a working medium double-flow-path, inner pipe liquid single-flow-path casing finned heat exchanger. The heat pump system comprises compressors 1A and 1B, four- way valves 2A and 2B, throttling elements 3A and 3B, a fluid A sleeve finned heat exchanger 4, a fluid B sleeve finned heat exchanger 5, a distributor a6, a distributor B7, a distributor c8, a distributor d9, a fan A10, a fan B11 and the like. The sleeve finned heat exchangers 4 and 5 are respectively composed of a working medium flow path I, a working medium flow path II and a liquid flow path, and a fan A10 and a fan B11 are arranged on the side of fins; the inner pipe of the sleeve forms a liquid flow path which is respectively connected with a pipeline of fluid A and a pipeline of fluid B, wherein the fluid A can be indoor domestic hot water, and the fluid B can be supplied heat source water and respectively flows in the inner pipes of the heat exchangers 4 and 5; the fans a10 and B11 drive indoor air and indoor exhaust air or outdoor air across the fin sides of the heat exchangers 4 and 5; two working medium flow paths are formed between the outer pipe and the inner pipe of the sleeve, the upper working medium flow path I and the lower working medium flow path II are formed, the working medium flow path I of the heat exchanger 4 and the working medium flow path II of the heat exchanger 5 are respectively connected with the compressor 1A, the four-way valve 2A and the throttling element 3A into a heat pump loop A after passing through a distributor a6 and a distributor d9, and the working medium can be R134a; and a working medium flow path II of the heat exchanger 4 and a working medium flow path I of the heat exchanger 5 are respectively connected with the compressor 1B, the four-way valve 2B and the throttling element 3B into a heat pump loop B after passing through a distributor B7 and a distributor c8, and the working medium can be R410A or R32.
Referring to fig. 2, 3 and 4, the fluid a double-pipe fin heat exchanger 4 is composed of an outer pipe 401, an inner pipe 402, an inner pipe elbow 403, an outer pipe elbow a404, a liquid upper header 405 and a lower header 414, fins 406, a first working medium flow path upper header 407 and a lower header 416, a right frame 408, an upper frame 409, an outer pipe elbow B410, a left frame 411, a lower frame 412, a second working medium flow path lower header 413 and an upper header 415, and the like, and is structured as follows: the outer tubes 401 are arranged into a tube array according to a certain rule, a plurality of fins 406 are arranged outside the outer tubes 401 in a stringing mode, and the tube array of the outer tubes 401 is supported between the left frame 411 and the right frame 408 and is tightly connected together; an inner pipe 402 is prefabricated into a U-shaped pipe and penetrates into an outer pipe 401 to form a sleeve, an outer pipe bent pipe B410 is sleeved into a U-shaped pipe bending part of the inner pipe 402 in advance, and the inner pipe 402 at the opening part of the U-shaped pipe penetrates through an outer pipe bent pipe A404; the outer pipe elbow A404 and the elbow B410 connect the outer pipe 401 into a plurality of branches according to the required rules and collect the branches in an upper header 407 and a lower header 416 of the first working medium flow path and an upper header 415 and a lower header 413 of the second working medium flow path respectively, and the inner pipe elbow 403 connects the inner pipe 402 into a plurality of branches according to the required rules and collects the branches in an upper liquid header 405 and a lower header 414; upper rim 409 and upper rim 412 are connected to right rim 408 and left rim 411, respectively, and form a mounting frame.
The composition and the structure of the fluid B double-pipe finned heat exchanger 5 are similar or similar to the fluid A double-pipe finned heat exchanger 4.
The distributor a6 comprises an upper valve a 61, an upper middle valve a 62, a middle lower valve a 63, a lower valve a 64 and the like, and the connection modes are as follows: one ends of the upper valve a 61 and the middle upper valve a 62 are connected in parallel and then connected with an upper collecting pipe 407 of the working medium flow path, and one ends of the middle lower valve a 63 and the lower valve a 64 are connected in parallel and then connected with a lower collecting pipe 416 of the working medium flow path; the other end of the upper valve a 61 and the middle and lower valve a 63 are connected in parallel and then connected to the right side pipe of the four-way valve 2A, and the other end of the middle and lower valve a 62 and the other end of the lower valve a 64 are connected in parallel and then connected to one end of the throttling element 3A.
The distributor b7 comprises an upper valve b71, a middle upper valve b72, a middle lower valve b73, a lower valve b74 and the like, and the connection modes are as follows: one end of the upper valve b71 and one end of the middle upper valve b72 are connected in parallel and then connected with the working medium flow path two upper collecting pipe 415, and one end of the middle lower valve b73 and one end of the lower valve b74 are connected in parallel and then connected with the working medium flow path two lower collecting pipe 413; the other end of the upper valve B71 and the other end of the middle and lower valve B73 are connected in parallel and then connected to the left pipe of the four-way valve 2B, and the other end of the middle and upper valve B72 and the other end of the lower valve B74 are connected in parallel and then connected to one end of the throttling element 3B.
The distributor c8 comprises an upper valve c81, a middle upper valve c82, a middle lower valve c83, a lower valve c84 and the like, and the connection modes are as follows: one ends of the upper valve c81 and the middle upper valve c82 are connected in parallel and then connected with an upper collecting pipe 507 of the working medium flow path, and one ends of the middle lower valve c83 and the lower valve c84 are connected in parallel and then connected with a lower collecting pipe 516 of the working medium flow path; the other end of the upper valve c81 and the middle and lower valves c83 are connected in parallel and then connected to the other end of the throttle element 3B, and the other end of the upper valve c82 and the other end of the lower valve c84 are connected in parallel and then connected to the right pipe of the four-way valve 2B.
The distributor b9 comprises an upper valve b91, a middle upper valve b92, a middle lower valve b93, a lower valve b94 and the like, and the connection modes are as follows: one end of the upper valve b91 and one end of the middle upper valve b92 are connected in parallel and then connected with the working medium flow path two upper collecting pipe 515, and one end of the middle lower valve b93 and one end of the lower valve b94 are connected in parallel and then connected with the working medium flow path two lower collecting pipe 513; the other end of the upper valve B91 is connected to the other end of the throttling element 3A in parallel with the middle and lower valve B93, and the other end of the middle and upper valve B92 is connected to the left pipe of the four-way valve 2B in parallel with the other end of the lower valve B94.
The suction port and the discharge port of the compressor 1A of the heat pump circuit a are connected to the finger and the main pipe of the four-way valve 2A, respectively, and the suction port and the discharge port of the compressor 1B of the heat pump circuit B are connected to the finger and the main pipe of the four-way valve 2B, respectively.
The heat pump loop A and the heat pump loop B respectively convert the flow direction of working media through the four-way valve 2A and the four-way valve 2B to realize the conversion of a heating mode and a cooling mode. When the heating mode works, the heat source water of the heat exchanger 5 or/and the heat of the indoor exhaust air can be transferred into the heat exchanger 4, and the indoor air and the domestic hot water can be heated simultaneously. By adopting two heat pump loops, the domestic hot water can be efficiently raised to a higher appropriate temperature, and meanwhile, the heat source water can generate larger temperature drop to fully utilize the heat of the water. In addition, if time intervals of indoor heat supply and hot water supply are different, the rotating speed of the fan A10 can be adjusted to change the priority sequence of heat supply and hot water supply, for example, the rotating speed of the fan A10 can be reduced to preferentially supply hot water, and conversely, heat supply can be preferentially performed. The fan B11 may be stopped by changing the rotation speed according to the indoor discharge condition. When the refrigeration mode works, the heat exchanger 4 can simultaneously cool indoor air and cold storage water, the heat exchanger 5 can heat water or/and release heat to indoor exhaust air or outdoor air, and the hot water can be used as life hot water.
Example two
Referring to fig. 5, the embodiment is a heat pump system using an inner tube working medium double-flow-path and liquid single-flow-path sleeve fin type heat exchanger. Compared with the first embodiment, the inner tube flow channels of the sleeve of the fluid a sleeve fin type heat exchanger 4 and the sleeve of the fluid B sleeve fin type heat exchanger 5 form two working medium flow channels, and the flow channel between the tubes forms a liquid flow channel. The rest is the same as the first embodiment.
Referring to fig. 6 and 7, the working medium branches formed by the inner tube 402 of the fluid a sleeve fin type heat exchanger 4 according to the required rule are respectively collected in the working medium flow path one upper collecting tube 407 and the lower collecting tube 416, and the working medium flow path two lower collecting tube 413 and the upper collecting tube 415, which form the working medium flow path one and the working medium flow path two, and the liquid branches formed by the outer tube 401 according to the required rule are respectively collected in the liquid upper collecting tube 405 and the lower collecting tube 414. Except the difference of the connection modes of the working medium flow path and the liquid flow path collecting pipe, the other parts are the same as the heat exchanger in the first embodiment.
The composition and the structure of the fluid B double-pipe finned heat exchanger 5 are similar or similar to the fluid A double-pipe finned heat exchanger 4.
Compared with the first embodiment, when the temperature of the fluid B is higher or the heating requirement of a room is smaller, the second embodiment can effectively reduce the running time of the heat pump, and the purpose of saving energy is achieved. For example, if the fluid B is hot water at about 45 ℃, heat can be supplied to indoor air through the sleeve-fin heat exchanger 5 without starting the heat pump; when domestic hot water at 55-65 ℃ is needed at the same time, the heat pump is started to absorb heat from the fluid B and release the heat into the fluid A.
EXAMPLE III
Referring to fig. 8, the embodiment is a heat pump system using a working medium double-flow-path, liquid double-flow-path sleeve fin type heat exchanger. Compared with the first embodiment, the inter-tube channels of the sleeves of the fluid A sleeve fin type heat exchanger 4 and the fluid B sleeve fin type heat exchanger 5 respectively form two working medium channels, and the inner-tube channels also respectively form two liquid channels; the two liquid flow paths can be used in parallel or in series, the fluid can be the same fluid in two temperature ranges or two different fluids, the flexibility of the liquid side is improved, and the working medium flow path and the liquid flow path can be conveniently exchanged for use. The rest is the same as the first embodiment.
Referring to fig. 9 and 10, compared with the heat exchanger of the first embodiment, the outer tube 401 is also prefabricated into a U-shaped tube, the flared portion of the U-shaped tube of the inner tube 402 passes through the bent portion of the U-shaped tube of the outer tube 401, and the other end of the outer tube 401 passes through the bent tube a404 of the outer tube, and then the bent tube B410 of the outer tube can be omitted; the inner pipe 402 is collected in an upper header 405 and an upper header 417 of a liquid flow path I, and a lower header 418 and a lower header 414 of a liquid flow path II respectively through liquid branches formed by an inner pipe bent pipe 403 according to a required rule; the outer pipe 401 collects working medium branch pipes formed by an outer pipe bent pipe A404 according to a required rule into a working medium flow path first upper collecting pipe 407 and a working medium flow path second lower collecting pipe 413 and an upper collecting pipe 415 respectively. The heat exchanger is the same as the heat exchanger of the first embodiment except that the liquid branch is connected with the collecting pipe in a different manner after one liquid flow path is added.
The composition and the structure of the fluid B double-pipe finned heat exchanger 5 are similar or similar to the fluid A double-pipe finned heat exchanger 4.
Example four
Referring to fig. 11, this embodiment is a heat pump system employing a working fluid single flow, liquid single flow double tube finned heat exchanger. The working medium is R290 or R32, and compared with the first embodiment, the other embodiments are the same as the first embodiment except that the inter-tube flow channels of the tubes of the tube fin type heat exchanger 4 of the fluid a and the tube fin type heat exchanger 5 of the fluid B respectively form only one working medium flow channel.
Referring to fig. 12 and 13, compared with the first heat exchanger of the embodiment, the outer tube 401 of the fluid a double-tube fin heat exchanger 4 is respectively collected to the working medium upper header 407 and the lower header 413 through the working medium branch formed by the outer tube elbow a404 according to the required rule, and the additional upper header 415 and the lower header 416 are omitted; similarly, the inner tubes 402 are collected by the upper and lower liquid flow path headers 405 and 414, respectively, by the liquid branches formed by the inner tube elbow 403 according to the required rules; except that the connection of the working medium branch after reducing a working medium flow path and the connection mode with the collecting pipe are different, the other parts are the same as the heat exchanger of the first embodiment.
The composition and the structure of the fluid B double-pipe finned heat exchanger 5 are similar or similar to the fluid A double-pipe finned heat exchanger 4.
When the fluid A sleeve finned heat exchanger 4 is arranged indoors and the fluid B sleeve finned heat exchanger 5 is arranged outdoors, at least two application scenes are adopted: the fluid A and the fluid B are both domestic hot water, the heat exchanger 4 can supply domestic hot water while supplying heat to the indoor in winter, the heat exchanger 5 can supply domestic hot water to a family while supplying cold to the indoor in summer, and the energy efficiency ratio of refrigeration in summer can be improved; the other scene is that the fluid A is domestic hot water, the fluid B is residual hot water or hot water made by solar energy, when the heat exchanger 4 supplies heat to the indoor space in winter, the heat exchanger 5 can also supply domestic hot water, and the fluid B and the atmosphere can be used as heat sources, so that the residual heat or the solar energy is preferentially used, and the energy efficiency ratio of the winter heating is effectively improved.
The above embodiments are only part of application schemes of the technology, a new application scheme can be combined according to actual requirements in an actual application scene, and the flow path arrangement of the two sleeve-pipe fin type heat exchangers can be the same or different. For example, in one of the first two tube-fin heat exchangers, the flow path arrangement of the heat exchanger in the second or third embodiment can be selected according to needs, and in the second or third embodiment, similar selection can be performed according to needs.
Claims (9)
1. The utility model provides a take heat pump system of sleeve pipe fin formula heat exchanger which characterized in that: the heat pump system consists of a plurality of compressors (1), a four-way valve (2), a throttling element (3) and two sleeve finned heat exchangers; fins are arranged on the outer side of a sleeve of the sleeve fin type heat exchanger, and working medium or liquid flow channels are arranged on the inter-tube side and the inner tube side of the sleeve; one or more working medium flow paths and liquid flow paths are respectively arranged on the two sleeve finned heat exchangers, and each working medium flow path or each liquid flow path is converged on the inlet and outlet collecting pipes; a working medium flow path of each sleeve finned heat exchanger is connected with the compressor (1), the four-way valve (2) and the throttling element (3) through an inlet header and an outlet header of the working medium flow path to form an independent heat pump loop; filling working medium into the heat pump loop; the number of working medium flow paths arranged on the two sleeve fin type heat exchangers is the same as that of heat pump loops formed correspondingly, and the liquid flow paths are communicated with a configured liquid pipeline through the inlet and outlet collecting pipes of the liquid flow paths.
2. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: the first sleeve finned heat exchanger (4) is provided with two working medium flow paths and a liquid flow path and consists of an outer pipe (401), an inner pipe (402), an inner pipe bent pipe (403), an outer pipe bent pipe A (404), a liquid upper collecting pipe (405), a lower collecting pipe (414), fins (406), a working medium flow path one upper collecting pipe (407), a working medium flow path one lower collecting pipe (416), a right frame (408), an upper frame (409), an outer pipe bent pipe B (410), a left frame (411), a lower frame (412), a working medium flow path two lower collecting pipe (413) and a working medium flow path two upper collecting pipe (415); the outer tubes (401) are arranged into a tube array according to a certain rule, a plurality of fins (406) are arranged outside the tube array in a stringing mode, and the tube array of the outer tubes (401) is supported between the left frame (411) and the right frame (408) and is tightly connected together; an inner pipe (402) is prefabricated into a U-shaped pipe and penetrates into an outer pipe (401) to form a sleeve, an outer pipe bent pipe B (410) is sleeved into a U-shaped pipe bending part of the inner pipe (402) in advance, and the inner pipe (402) of the opening part of the U-shaped pipe penetrates through an outer pipe bent pipe A (404); the outer pipe bent pipe A (404) and the bent pipe B (410) connect the outer pipe (401) into a plurality of branches according to the required rules and collect the branches in an upper collecting pipe (407) and a lower collecting pipe (416) of a first working medium flow path and an upper collecting pipe (415) and a lower collecting pipe (413) of a second working medium flow path respectively, and the inner pipe bent pipe (403) connects the inner pipe (402) into a plurality of branches according to the required rules and collect the branches in an upper liquid collecting pipe (405) and a lower liquid collecting pipe (414); the upper frame (409) and the upper frame (412) are respectively connected with the right frame (408) and the left frame (411) to form the mounting frame.
3. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: the heat pump system is provided with two heat pump loops, wherein each heat pump loop consists of a first compressor (1A), a second compressor (1B), a first four-way valve (2A), a second four-way valve (2B), a first throttling element (3A), a second throttling element (3B), a first sleeve finned heat exchanger (4), a second sleeve finned heat exchanger (5), a distributor a (6), a distributor B (7), a distributor c (8), a distributor d (9), a fan A (10) and a fan B (11); a fan A (10) and a fan B (11) are arranged on the fin side of the sleeve fin type heat exchanger, and a first working medium flow path of the first sleeve fin type heat exchanger (4) and a second working medium flow path of the second sleeve fin type heat exchanger (5) are connected with a first compressor (1A), a first four-way valve (2A) and a first throttling element (3A) to form a heat pump loop A after respectively passing through a distributor a (6) and a distributor d (9); a working medium flow path II of the first sleeve finned heat exchanger (4) and a working medium flow path I of the second sleeve finned heat exchanger (5) respectively pass through a distributor B (7) and a distributor c (8) and then are connected with a second compressor (1B), a second four-way valve (2B) and a second throttling element (3B) to form a heat pump loop B; the tube-fin heat exchanger is provided with one or two liquid flow paths, and the liquid flow paths are the same or different.
4. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: a finned sleeve with a sleeve pipe finned heat exchanger is of a pipe sleeve finned type, a pipe rolled finned type or a pipe wound type; the fins on the fin sleeve can be omitted, and the outer pipe is formed by connecting single pipes which are arranged according to a rule into a flow path by using bent pipes or is formed into a U-shaped pipe or an S-shaped pipe and then is connected into the flow path by using the bent pipes; the inner pipe arranged in the fin sleeve is a single pipe or a plurality of pipes, and the connection mode of the two ends is suitable for the fin sleeve.
5. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: the flow path arrangement of the two sleeve pipe fin type heat exchangers is the same or different; the number of the working medium channels and the number of the liquid channels may be one, or two or more.
6. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: the four-way valve can be omitted; the throttling element is a throttling pipe, a throttling hole, a throttling valve or an expansion valve; the compressor is a stand-alone compressor or a compressor cylinder with independent suction and discharge.
7. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 1, wherein: the inner pipe and the flow passage between the pipes of the sleeve-pipe finned heat exchanger of the heat pump system are respectively fed with liquid and working medium or respectively fed with the working medium and the liquid; the working medium is R134a, R410A, R32, R290 or R600A, the fluid is water, antifreeze or synthetic fluid, the working medium used by different heat pump circuits is the same or different, and the fluid used by different liquid flow paths is the same or different.
8. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 2, wherein: an outer pipe (401) of the first sleeve pipe fin type heat exchanger (4) is prefabricated into a U-shaped pipe, an outer pipe bent pipe B (410) can be omitted, the opening part of the U-shaped pipe of the inner pipe (402) penetrates through the U-shaped pipe bending part of the outer pipe (401), and the other end of the outer pipe (401) penetrates through an outer pipe bent pipe A (404).
9. The heat pump system with the double-pipe finned heat exchanger as claimed in claim 3, wherein: the distributor is formed by connecting four two-way valves or single-phase valves or two three-way valves according to the principle that the flow directions in the working medium flow paths are consistent.
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| CN202210865726.6A CN115235145A (en) | 2022-07-21 | 2022-07-21 | Heat pump system with sleeve pipe fin type heat exchanger |
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| CN202210865726.6A CN115235145A (en) | 2022-07-21 | 2022-07-21 | Heat pump system with sleeve pipe fin type heat exchanger |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220893A (en) * | 1997-01-31 | 1998-08-21 | Denso Corp | Heat pump device |
| CN101126561A (en) * | 2007-08-01 | 2008-02-20 | 中原工学院 | Air- solar energy double heat source synchronous composite type heat pump device |
| CN102003833A (en) * | 2010-10-27 | 2011-04-06 | 华北电力大学（保定） | Transcritical carbon dioxide heat pump type air conditioning water heater using condensation residual heat |
| WO2013061473A1 (en) * | 2011-10-28 | 2013-05-02 | 株式会社日立製作所 | Hot-water supply and air-conditioning device |
| WO2015132963A1 (en) * | 2014-03-07 | 2015-09-11 | 三菱電機株式会社 | Heat exchanger and air conditioner |
| CN106802010A (en) * | 2017-03-19 | 2017-06-06 | 北京工业大学 | The multiple circuit heat pump that a kind of heat exchange coil is stacked successively |
| CN110360764A (en) * | 2019-07-02 | 2019-10-22 | 上海柯茂机械有限公司 | Using the air-cooled heat pump unit of distribution defrosting |
| CN212481758U (en) * | 2020-08-20 | 2021-02-05 | 广东瑞星新能源科技有限公司 | Take trigeminy of heat recovery to supply heat pump set |
| CN216048463U (en) * | 2021-01-08 | 2022-03-15 | 北京工业大学 | Heat pump system of modular indoor natural convection heat exchange unit |
| CN218442859U (en) * | 2022-07-21 | 2023-02-03 | 北京工业大学 | Heat pump system with sleeve finned heat exchanger |
-
2022
- 2022-07-21 CN CN202210865726.6A patent/CN115235145A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220893A (en) * | 1997-01-31 | 1998-08-21 | Denso Corp | Heat pump device |
| CN101126561A (en) * | 2007-08-01 | 2008-02-20 | 中原工学院 | Air- solar energy double heat source synchronous composite type heat pump device |
| CN102003833A (en) * | 2010-10-27 | 2011-04-06 | 华北电力大学（保定） | Transcritical carbon dioxide heat pump type air conditioning water heater using condensation residual heat |
| WO2013061473A1 (en) * | 2011-10-28 | 2013-05-02 | 株式会社日立製作所 | Hot-water supply and air-conditioning device |
| WO2015132963A1 (en) * | 2014-03-07 | 2015-09-11 | 三菱電機株式会社 | Heat exchanger and air conditioner |
| CN106802010A (en) * | 2017-03-19 | 2017-06-06 | 北京工业大学 | The multiple circuit heat pump that a kind of heat exchange coil is stacked successively |
| CN110360764A (en) * | 2019-07-02 | 2019-10-22 | 上海柯茂机械有限公司 | Using the air-cooled heat pump unit of distribution defrosting |
| CN212481758U (en) * | 2020-08-20 | 2021-02-05 | 广东瑞星新能源科技有限公司 | Take trigeminy of heat recovery to supply heat pump set |
| CN216048463U (en) * | 2021-01-08 | 2022-03-15 | 北京工业大学 | Heat pump system of modular indoor natural convection heat exchange unit |
| CN218442859U (en) * | 2022-07-21 | 2023-02-03 | 北京工业大学 | Heat pump system with sleeve finned heat exchanger |
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Inventor after: Ma Guoyuan Inventor after: Gong Yuexuan Inventor after: Xu Shuxue Inventor after: Li Fuping Inventor before: Ma Guoyuan Inventor before: Gong Yuexuan Inventor before: Xu Shuxue Inventor before: Li Fuping |