CN107449309B - Honeycomb type gas cooler for carbon dioxide heat pump - Google Patents
Honeycomb type gas cooler for carbon dioxide heat pump Download PDFInfo
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- CN107449309B CN107449309B CN201710640796.0A CN201710640796A CN107449309B CN 107449309 B CN107449309 B CN 107449309B CN 201710640796 A CN201710640796 A CN 201710640796A CN 107449309 B CN107449309 B CN 107449309B
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- carbon dioxide
- heat exchange
- heat exchanger
- heat
- coolant
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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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
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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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
- F28D2021/0073—Gas coolers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a honeycomb type gas cooler for a carbon dioxide heat pump, which comprises a heat exchange monomer body with a honeycomb type cross section and a carbon dioxide sleeve sleeved at the center of the heat exchange monomer body; wherein, the one end of heat transfer monomer body is coolant import, and the other end is coolant export, and the one end of carbon dioxide sleeve pipe is carbon dioxide gas import, and the other end is carbon dioxide gas export. The honeycomb type heat exchange monomer body provided by the invention combines the advantages of a micro-channel heat exchanger and a double-pipe heat exchanger, and overcomes the defect of poor matching between the traditional heat exchanger and a carbon dioxide heat pump. The cold and hot fluid flow divider and the flow combiner are positioned between the cold and hot fluid inlet and outlet and the heat exchange monomer body, so that the fluid can uniformly and quickly pass through the heat exchanger unit body. The invention aims to overcome the defects of the traditional heat exchanger, fully utilize the property of the supercritical region of the carbon dioxide working medium, strengthen the heat exchange of the heat exchanger and improve the efficiency of the carbon dioxide heat pump.
Description
Technical Field
The invention belongs to the technical field of heat pump equipment, and particularly relates to a honeycomb type gas cooler for a carbon dioxide heat pump.
Background
The air source heat pump, as a device for extracting and utilizing low-grade heat in air by consuming a small part of electric energy, has gained more and more attention due to its characteristics of environmental protection, energy saving, safety and convenience. However, the refrigerant used in the traditional heat pump has the problems of environmental damage, ozone hole and greenhouse effect, and has great influence on the production and life of people. And the stability and the heating capacity of the traditional working medium heat pump are limited under extreme weather working conditions, so that people must consider searching for a new refrigerant to meet the requirements on working efficiency and environmental protection. CO using natural refrigerant carbon dioxide as refrigerant2Air source heat pump has good environmental protection characteristic when guaranteeing the higher COP of system, can effectively control the destruction of ozone layer, reduces greenhouse gas's production, suppresses the burning of coal, reduces the incidence of haze weather and reduces haze concentration, combines energy-conservation and environmental protection together organically simultaneously, and the system is transcriticalThe high efficiency of the hot water generated circularly saves the heating energy consumption of users, and is an important scheme for solving the heating problem in northern China. Therefore, the method has wide market and potential in China.
Compared with the traditional heat pump, the gas cooler in the carbon dioxide heat pump is characterized in that the refrigerant gas discharged by the compressor does not change the phase, but completes the heat exchange process through sensible heat. Due to the transcritical circulation process, CO2The gas has high temperature and high pressure in the supercritical region and small specific volume, so that CO2Small flow, high pressure and large temperature slip. This directly results in the required gas cooler characteristics such as high compressive strength, the pipe diameter is little, heat transfer is strong. In view of the existing forms, the gas cooler is large in size, difficult to manufacture and low in heat exchange efficiency, so that the improvement of the gas cooler is urgently needed, the overall efficiency of the carbon dioxide heat pump is improved, and the further popularization of the clean, environment-friendly and efficient carbon dioxide heat pump in China is promoted.
Disclosure of Invention
The invention aims to provide a novel more compact and efficient honeycomb type gas cooler for a carbon dioxide heat pump, aiming at the defects of the gas cooler in the transcritical circulation of the current carbon dioxide heat pump. The heat exchange efficiency of the carbon dioxide working medium in the supercritical area is improved, so that the overall efficiency of the carbon dioxide heat pump system is improved.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a honeycomb type gas cooler for a carbon dioxide heat pump comprises a heat exchange single body with a honeycomb type cross section and a carbon dioxide sleeve sleeved at the center of the heat exchange single body; wherein the content of the first and second substances,
one end of the heat exchange monomer body is a coolant inlet, the other end of the heat exchange monomer body is a coolant outlet, one end of the carbon dioxide sleeve is a carbon dioxide gas inlet, and the other end of the carbon dioxide sleeve is a carbon dioxide gas outlet.
The invention is further improved in that the heat exchange monomer body is spirally arranged.
A further development of the invention is that both the coolant inlet and the coolant outlet are provided with heat exchanger connections.
The invention is further improved in that sealing strips are arranged at the joint of the heat exchanger joint and the coolant inlet and at the joint of the heat exchanger joint and the coolant outlet.
The invention is further improved in that the coolant inlet and the carbon dioxide gas outlet are arranged at the same end, and the coolant outlet and the carbon dioxide gas inlet are arranged at the same end.
The invention is further improved in that the cross section of the heat exchange monomer body consists of a plurality of regular figure sections.
A further improvement of the invention is that the regular pattern is a regular hexagon, triangle, circle or square.
The invention has the further improvement that a fluid flow channel of the heat exchange monomer body is a micro-channel, the hydraulic equivalent diameter is 0.5-1mm, and the wall thickness is 0.2-0.6 mm.
The invention has the following beneficial effects:
the novel more compact and efficient honeycomb heat exchanger used as a gas cooler is designed, and the novel carbon dioxide liquid separating and collecting device and the honeycomb heat exchange unit are beneficial to improving the heat exchange efficiency of a carbon dioxide working medium in a supercritical region, so that the overall operation efficiency of a carbon dioxide heat pump system is improved. The carbon dioxide heat pump adopts transcritical circulation, the carbon dioxide does not generate phase change in a supercritical region, and heat exchange is carried out by means of sensible heat. In the supercritical region, the high-temperature and high-pressure carbon dioxide working medium has the advantages of high unit mass heating capacity, small flow, high pressure and large temperature slippage. The honeycomb type heat exchanger is essentially a micro-channel heat exchanger, the sectional area is small, the heat exchange area is large, the equipment pressure bearing is high, the honeycomb type micro-channel heat exchanger can be well matched with the characteristics of the supercritical cooling process of carbon dioxide gas, and the efficiency is improved.
Further, in the honeycomb heat exchanger structure, the cross-sectional shape of the flow channel is designed into a regular pattern by utilizing the bionics principle, and the regular pattern comprises a regular hexagon, a circle and the like, so that the flow heat exchange is facilitated, and meanwhile, each wall surface of the flow channel can be used as fins of other flow channels, so that the heat exchange speed is higher, the uniformity is higher, and the heat exchange effect is better.
Furthermore, the heat exchanger joint comprises a refrigerant liquid distribution port and a coolant liquid distribution port, so that working media can be distributed more uniformly, and heat exchange is efficient and stable. By utilizing the shunting and guiding effects of the joint, the carbon dioxide working medium and the coolant working medium respectively enter the corresponding flow passages, the pressure drop is reduced, the higher heat exchange coefficient is kept, and further the working medium is uniformly distributed into each passage of the heat exchanger through the joint, so that the problems of air blockage, uneven liquid distribution and the like are avoided.
Drawings
Fig. 1 is an external view of a honeycomb gas cooler.
Fig. 2 is an axial cross-sectional view of a honeycomb heat exchanger joint.
Fig. 3 is a cross-sectional view of a honeycomb heat exchange unit body, wherein the shaded part is a carbon dioxide gas flow channel, and the white part is a coolant flow channel.
Fig. 4 is an isometric view of a honeycomb heat exchanger.
In the figure: 1 is the carbon dioxide gas import, 2 is the carbon dioxide gas export, and 3 are the coolant import, and 4 are the coolant export, and 5 are heat transfer monomer bodies, and 6 are the heat exchanger joint, and 7 are the carbon dioxide sleeve pipe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the honeycomb gas cooler for a carbon dioxide heat pump provided by the invention comprises a heat exchange single body 5 with a honeycomb cross section and a carbon dioxide sleeve 7 sleeved at the center of the heat exchange single body 5; wherein, the one end of heat transfer monomer body 5 is coolant import 3, and the other end is coolant export 4, and the one end of carbon dioxide sleeve pipe 7 is carbon dioxide gas import 1, and the other end is carbon dioxide gas export 2.
Fig. 1 is an external view of a honeycomb heat exchanger. The external potential of the gas cooler is similar to that of a double-pipe heat exchanger and is arranged in a spiral pipe shape, and the structure enables the gas cooler to be more compact and efficient. In the heat exchange process, carbon dioxide enters the heat exchanger through the carbon dioxide gas inlet 1 and is discharged from the carbon dioxide gas outlet 2, coolant enters the heat exchanger through the coolant inlet 3 and is discharged from the coolant outlet 4, and the carbon dioxide and the coolant are subjected to countercurrent heat exchange in the heat exchange monomer body 5. Wherein the heat exchanger joint 6 consists of an inlet and an outlet of two working mediums.
Referring to fig. 2, a honeycomb heat exchanger joint axial cross section is shown. Its external form is analogous to a sleeve joint, for a total of two interfaces. When the method is applied to a carbon dioxide supercritical heat pump cycle, taking a carbon dioxide inlet side as an example, high-temperature and high-pressure carbon dioxide gas enters a carbon dioxide gas inlet 1, and the carbon dioxide is divided into two parts. One strand enters the inner pipe and is connected with the centremost flow passage of the heat exchange monomer body 5; the other strand is connected with the other layer of the honeycomb type heat exchange unit between the inner pipe and the outer pipe, wherein the middle of the two layers is separated by one layer to form a coolant flow channel. Coolant flows into the flow combiner through coolant inlet 3 and out through coolant outlet 4.
Referring to fig. 3, a cross-sectional view of a honeycomb heat exchange unit is shown, wherein the flow channel shape can be any geometric shape such as regular hexagon, circle, rectangle, triangle, etc. In the embodiment, the heat exchange unit is a bionic honeycomb hexagon, a shadow part is a carbon dioxide working medium flow channel in the heat exchange unit, and a blank part is a coolant working medium flow channel in the heat exchange unit. The carbon dioxide and the coolant are sequentially arranged in a layered and alternate mode for heat exchange. In the whole heat exchange process, the carbon dioxide working medium and the secondary refrigerant working medium are in sleeve type cladding heat exchange. Each flow passage has a small area, and is a micro-channel heat exchange unit. The wall surface of the flow channel in each layer is equivalent to a heat exchange fin, and the heat exchange fins interact with each other to strengthen the heat exchange.
Referring to fig. 2, 3 and 4, each honeycomb gas cooler has two connectors, which respectively include a cold and hot fluid inlet and outlet and a splitter manifold. Taking a carbon dioxide inlet joint as an example, when the heat exchanger is used, a carbon dioxide working medium is divided into two streams through a carbon dioxide gas inlet 1 and respectively flows into an inlet sleeve, wherein an inner tube working medium directly enters the heat exchange unit, an outer tube working medium is divided into two streams again and enters a second layer of heat exchange flow channel, and through twice flow division, the carbon dioxide working medium quickly enters the honeycomb type heat exchange unit and is uniformly distributed to small flow channels in the heat exchange unit, so that the heat exchanger is well adapted to the advantages of a microchannel heat exchanger. Taking the working medium inlet joint of the cooling agent as an example, when in use, the working medium at the working medium inlet of the cooling agent is divided into two parts through the inlet, and the two parts respectively enter the corresponding flow layers and are arranged at intervals with the working medium of the carbon dioxide for countercurrent heat exchange, thereby ensuring that the working medium can exchange heat quickly, efficiently and stably.
The honeycomb type gas cooler provided by the invention combines the appearance of the sleeve type heat exchanger and the essence of the micro-channel heat exchanger, integrates the advantages of the two heat exchangers, increases the heat exchange area, reduces the volume of the heat exchanger, improves the speed of the heat exchanger, uniformly distributes working media to enter the heat exchanger, overcomes the defects of the current heat exchanger, is more suitable for carbon dioxide transcritical heat pump circulation, increases the heat exchange efficiency, and further improves the overall efficiency of the carbon dioxide heat pump.
Claims (5)
1. A honeycomb type gas cooler for a carbon dioxide heat pump is characterized by comprising a heat exchange single body (5) with a honeycomb type cross section and a carbon dioxide sleeve (7) sleeved at the center of the heat exchange single body (5); the heat exchange single body (5) is spirally arranged, one end of the heat exchange single body (5) is provided with a coolant inlet (3), the other end of the heat exchange single body is provided with a coolant outlet (4), and the coolant inlet (3) and the coolant outlet (4) are both provided with heat exchanger joints (6); one end of the carbon dioxide sleeve (7) is provided with a carbon dioxide gas inlet (1), the other end is provided with a carbon dioxide gas outlet (2), the coolant inlet (3) and the carbon dioxide gas outlet (2) are arranged at the same end, and the coolant outlet (4) and the carbon dioxide gas inlet (1) are arranged at the same end; in the heat exchange process, supercritical carbon dioxide enters the heat exchanger from a carbon dioxide gas inlet (1) and is discharged out of the heat exchanger from a carbon dioxide gas outlet (2), a coolant enters the heat exchanger from a coolant inlet (3) and is discharged out of the heat exchanger from a coolant outlet (4), and the supercritical carbon dioxide and the coolant are subjected to countercurrent heat exchange in a heat exchange monomer body (5); the heat exchanger joint (6) comprises a carbon dioxide inlet (1), the carbon dioxide gas inlet (1) is a hollow cavity, the carbon dioxide sleeve (7) is arranged in the carbon dioxide gas inlet, and the diameter of the carbon dioxide sleeve (7) is smaller than that of the carbon dioxide inlet (1); the carbon dioxide sleeve (7) is communicated with the center of the heat exchange monomer body (5), a cavity outside the carbon dioxide sleeve (7) is communicated with the other layer of cavity of the heat exchange monomer body (5), and a layer separated from the two layers of carbon dioxide fluid channels is a cooling liquid channel; the fluid channel of each layer is composed of a plurality of tubular passages, and the adjacent two tubular passages are not communicated with each other.
2. A honeycomb gas cooler for a carbon dioxide heat pump according to claim 1, characterized in that the connection of the heat exchanger joint (6) with the coolant inlet (3) and the connection of the heat exchanger joint (6) with the coolant outlet (4) are provided with sealing strips.
3. The honeycomb gas cooler for carbon dioxide heat pumps according to claim 1 is characterized in that the cross section of the heat exchange monoblock body (5) consists of several regular pattern sections.
4. The honeycomb gas cooler for a carbon dioxide heat pump according to claim 3, characterized in that the regular pattern is a regular hexagon, triangle, circle or square.
5. The honeycomb type gas cooler for the carbon dioxide heat pump according to claim 1, wherein the fluid flow channel of the heat exchange monomer body (5) is a micro-channel, the hydraulic equivalent diameter is 0.5-1mm, and the wall thickness is 0.2-0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640796.0A CN107449309B (en) | 2017-07-31 | 2017-07-31 | Honeycomb type gas cooler for carbon dioxide heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710640796.0A CN107449309B (en) | 2017-07-31 | 2017-07-31 | Honeycomb type gas cooler for carbon dioxide heat pump |
Publications (2)
| Publication Number | Publication Date |
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| CN107449309A CN107449309A (en) | 2017-12-08 |
| CN107449309B true CN107449309B (en) | 2020-03-17 |
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| CN201710640796.0A Active CN107449309B (en) | 2017-07-31 | 2017-07-31 | Honeycomb type gas cooler for carbon dioxide heat pump |
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| CN214666270U (en) * | 2020-08-26 | 2021-11-09 | 广东美的暖通设备有限公司 | Heat exchanger, electric control box and air conditioning system |
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| CN202562335U (en) * | 2012-03-17 | 2012-11-28 | 深圳市万越新能源科技有限公司 | Multiple tube-bundle type double-tube gas cooler for carbon dioxide transcritical compression type heat pump |
| CN103206876B (en) * | 2013-03-29 | 2015-01-07 | 合肥通用机械研究院 | Honeycomb tubular type efficient heat exchanger with fine channels |
| WO2016094971A1 (en) * | 2014-12-15 | 2016-06-23 | Intel Energy | Hot drain water heat recovery installation of vertical heat exchanger type |
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