CN212320123U - Water source heat pump system using carbon dioxide as secondary refrigerant - Google Patents
Water source heat pump system using carbon dioxide as secondary refrigerant Download PDFInfo
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- CN212320123U CN212320123U CN202020501992.7U CN202020501992U CN212320123U CN 212320123 U CN212320123 U CN 212320123U CN 202020501992 U CN202020501992 U CN 202020501992U CN 212320123 U CN212320123 U CN 212320123U
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Abstract
The utility model relates to the technical field of water source heat pump systems, in particular to a water source heat pump system using carbon dioxide as secondary refrigerant, which comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger; four openings of the four-way valve are respectively connected with an exhaust port of the compressor, an air suction port of the compressor, the first heat exchanger and the second heat exchanger; a throttling element is arranged between the first heat exchanger and the second heat exchanger; the second heat exchanger is provided with a refrigerant passage and a carbon dioxide heat exchange passage, two openings of the carbon dioxide heat exchange passage are respectively connected with a third heat exchanger through a gas pipeline and a liquid pipeline, the third heat exchanger is immersed in a ground surface water source, and the liquid pipeline is provided with a carbon dioxide circulating pump. The third heat exchanger immersed in the surface water is arranged, so that a heat source of the surface water can be reasonably utilized; and carbon dioxide is used as a secondary refrigerant in the third heat exchanger, so that long-distance transportation of energy is facilitated.
Description
Technical Field
The utility model relates to a water source heat pump system technical field especially relates to a water source heat pump system who uses carbon dioxide as secondary refrigerant.
Background
The water source heat pump technology is a technology for effectively utilizing renewable energy and low-grade heat energy. In recent years, water source heat pump technology has been rapidly developed and applied driven by energy and environmental issues. China has abundant surface water resources, and a water source heat pump system using surface water as a low-level heat source has extremely wide development and application prospects in China.
However, the water source is generally far from the building requiring cooling and heating, and if a pipeline system is established to lead water to the vicinity of the building, an ultra-long pipeline system is required to be laid, so that the conveying resistance is too large, the conveying power consumption is too high, and the economical efficiency and the utilization rate are not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a solve the long distance transmission high power consumption, poor water resource heat pump system who uses carbon dioxide as secondary refrigerant of economic nature.
In order to solve the technical problem, the utility model provides a water source heat pump system using carbon dioxide as secondary refrigerant, which comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger; four openings of the four-way valve are respectively connected with an exhaust port of the compressor, an air suction port of the compressor, the first heat exchanger and the second heat exchanger; a throttling element is arranged between the first heat exchanger and the second heat exchanger; the second heat exchanger is provided with a refrigerant passage and a carbon dioxide heat exchange passage, two openings of the carbon dioxide heat exchange passage are respectively connected with the third heat exchanger through a gas pipeline and a liquid pipeline, the third heat exchanger is used for being immersed in a ground water source, and the liquid pipeline is provided with a carbon dioxide circulating pump.
In one embodiment, the throttling element is an electronic expansion valve.
In one embodiment, the throttling element is a first expansion valve, the second heat exchanger is communicated with the first end of the first expansion valve through a fourth one-way valve, the communication direction of the fourth one-way valve is from the second heat exchanger to the first expansion valve, the second end of the first expansion valve is communicated with the first heat exchanger through a third one-way valve, and the communication direction of the third one-way valve is from the first expansion valve to the first heat exchanger; the first heat exchanger is communicated with the first end of the first expansion valve through a second one-way valve, the conduction direction of the second one-way valve is from the first heat exchanger to the first expansion valve, the second end of the first expansion valve is communicated with the second heat exchanger through the first one-way valve, and the conduction direction of the first one-way valve is from the first expansion valve to the second heat exchanger.
In one embodiment, the throttling element is a second expansion valve and a third expansion valve, the second expansion valve and the third expansion valve are arranged between the first heat exchanger and the second heat exchanger in series, a fifth check valve is connected in parallel to two ends of the second expansion valve, a sixth check valve is connected in parallel to two ends of the third expansion valve, the fifth check valve and the third expansion valve are communicated in the direction from the first heat exchanger to the second heat exchanger, and the sixth check valve and the second expansion valve are communicated in the direction from the second heat exchanger to the first heat exchanger.
In one embodiment, the carbon dioxide circulation pump is a centrifugal circulation pump or a positive displacement circulation pump.
In one embodiment, the number of the compressors is multiple, and the multiple compressors are connected in parallel.
In one embodiment, the compressor is a conventional centrifugal compressor, an air-levitated centrifugal compressor, a magnetically levitated centrifugal compressor or a screw compressor.
In one embodiment, the first heat exchanger and the second heat exchanger are a double-tube heat exchanger, a shell-and-tube heat exchanger, or a plate-and-shell heat exchanger.
In one embodiment, the third heat exchanger is a finned tube heat exchanger.
In one embodiment, the third heat exchanger is provided with a cleaning brush.
The utility model has the advantages that: because the third heat exchanger immersed in the surface water is arranged, a surface water heat source can be reasonably utilized; and carbon dioxide is used as a secondary refrigerant in the third heat exchanger, so that long-distance transportation is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a water source heat pump system using carbon dioxide as a coolant in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another water source heat pump system using carbon dioxide as coolant in the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a self-cleaning device in an embodiment of the present invention.
Description of reference numerals: 1. a first heat exchanger; 2. a compressor; 3. a four-way valve; 4. a second heat exchanger; 51. a first check valve; 52. a second one-way valve; 53. a third check valve; 54. a fourth check valve; 55. a fifth check valve; 56. a sixth check valve; 61. a first expansion valve; 62. a second expansion valve; 63. a third expansion valve; 7. a carbon dioxide circulating pump; 8. a gas line; 9. a third heat exchanger; 10. a liquid line; 11. a heat exchange line; 12. the brush is cleaned.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the utility model.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1 and fig. 2, a water source heat pump system using carbon dioxide as coolant in the embodiment of the present invention includes a compressor 2, a four-way valve 3, a first heat exchanger 1, a second heat exchanger 4, and a third heat exchanger 9; four openings of the four-way valve 3 are respectively connected with an exhaust port of the compressor 2, an air suction port of the compressor 2, the first heat exchanger 1 and the second heat exchanger 4, and a throttling element is arranged between the first heat exchanger 1 and the second heat exchanger 4; the second heat exchanger 4 is provided with a refrigerant passage and a carbon dioxide heat exchange passage, two openings of the carbon dioxide heat exchange passage are respectively connected with a third heat exchanger 9 through a gas pipeline 8 and a liquid pipeline 10, the third heat exchanger 9 is immersed in a ground water source, and the liquid pipeline 10 is provided with a carbon dioxide circulating pump 7. In particular, surface water sources are referred to as rivers, lakes, seas, etc. The throttling element has a throttling and pressure reducing regulation function and can be in various forms, such as an electronic expansion valve, an orifice plate, a thermal expansion valve and the like.
Because the third heat exchanger immersed in the surface water is arranged, a surface water heat source can be reasonably utilized; and carbon dioxide is used as secondary refrigerant in the third heat exchanger and the carbon dioxide heat exchange path, so that long-distance transportation is facilitated. The carbon dioxide is used as the secondary refrigerant, and the advantages are as follows: 1. the carbon dioxide has high pressure, good fluidity and small pressure loss; 2. the carbon dioxide has large phase change latent heat and small circulation flow, and the size of a pipeline using the carbon dioxide as a secondary refrigerant is smaller than that of a pipeline for conveying water; 3. the carbon dioxide circulating pump has small flow, low lift and more energy-saving power compared with a water pump.
In one embodiment, the throttling element is an electronic expansion valve.
As shown in fig. 1, in one embodiment, the throttling element is a first expansion valve 61, the second heat exchanger 4 is communicated with the first end of the first expansion valve 61 through a fourth check valve 54, the communication direction of the fourth check valve 54 is from the second heat exchanger 4 to the first expansion valve 61, the second end of the first expansion valve 61 is communicated with the first heat exchanger 1 through a third check valve 53, and the communication direction of the third check valve 53 is from the first expansion valve 61 to the first heat exchanger 1; the first heat exchanger 1 communicates with a first end of the first expansion valve 61 through the second check valve 52, a communication direction of the second check valve 52 is from the first heat exchanger 1 to the first expansion valve 61, a second end of the first expansion valve 61 communicates with the second heat exchanger 4 through the first check valve 51, and a communication direction of the first check valve 51 is from the first expansion valve 61 to the second heat exchanger 4.
The working process of the water source heat pump system taking carbon dioxide as secondary refrigerant in the embodiment is as follows:
in a refrigeration working condition, liquid carbon dioxide is conveyed to a carbon dioxide circulating heat exchange passage of a second heat exchanger 4 of the heat pump system through a liquid pipeline 10 by a carbon dioxide circulating pump 7, and carbon dioxide liquid entering the carbon dioxide circulating heat exchange passage exchanges heat with gaseous refrigerant flowing through a first heat exchange passage of the second heat exchanger 4, so that the gaseous refrigerant is condensed into high-temperature and high-pressure liquid; the high-temperature and high-pressure liquid refrigerant enters the first expansion valve 61 through the fourth check valve 54 (at this time, the first check valve 51 and the second check valve 52 are in a reverse non-conducting state) to be throttled and reduced into a low-temperature and low-pressure gas-liquid mixture, then enters the first heat exchanger 1 through the third check valve 53, exchanges heat with a medium in the first heat exchanger 1, absorbs the heat of the medium, and is evaporated into low-temperature and low-pressure gas; the refrigerant enters the compressor 2 after passing through the four-way valve 3, is compressed into high-temperature and high-pressure gas by the compressor 2, and then enters the second heat exchanger 4 through the four-way valve 3 to complete the refrigeration cycle; after heat exchange is carried out between the liquid carbon dioxide and the gaseous refrigerant in the second heat exchanger 4, the liquid carbon dioxide absorbs heat and is evaporated into gas, the gas enters a third heat exchanger 9 through a gas pipeline 8 to exchange heat with a surface water source, and the carried heat is released into the surface water source; after the carbon dioxide is condensed into liquid, the carbon dioxide continues to participate in circulation.
When the heating working condition is met, the third heat exchanger 9 is immersed in the surface water source, the carbon dioxide of the liquid exchanges heat with the surface water, the carbon dioxide absorbs heat and is vaporized, and the low-level heat energy of the surface water source is transmitted to the second heat exchanger 4 through the gas pipeline 8; the liquid refrigerant and the carbon dioxide of the gas exchange heat in the second heat exchanger 4, the carbon dioxide releases heat and condenses, the condensed formed liquid carbon dioxide is conveyed into a third heat exchanger 9 through a liquid pipeline 10 by a carbon dioxide circulating pump 7, and the heat absorption and evaporation are continued to finish the cold carrying circulation; the liquid refrigerant in the second heat exchanger 4 absorbs heat to become low-temperature low-pressure gas, returns to the compressor 2 through the four-way valve 3, is compressed into high-temperature high-pressure gas by the compressor 2, enters the first heat exchanger 1 through the four-way valve 3, exchanges heat with the medium in the first heat exchanger 1, transfers heat to the medium, is condensed into high-temperature high-pressure liquid, passes through the second one-way valve 52 (at the moment, the third one-way valve 53 and the fourth one-way valve 54 are in a reverse non-conduction state), enters the first expansion valve 61 to be throttled and reduced to become low-temperature low-pressure gas-liquid mixture, and then enters the second heat exchanger 4 through the first one-way valve.
As shown in fig. 2, in one embodiment, the throttling elements are a second expansion valve 62 and a third expansion valve 63, the second expansion valve 62 and the third expansion valve 63 are arranged in series between the first heat exchanger 1 and the second heat exchanger 4, both ends of the second expansion valve 62 are connected in parallel with a fifth check valve 55, both ends of the third expansion valve 63 are connected in parallel with a sixth check valve 56, the direction of communication of the fifth check valve 55 and the third expansion valve 63 is from the first heat exchanger 1 to the second heat exchanger 4, and the direction of communication of the sixth check valve 56 and the second expansion valve 62 is from the second heat exchanger 4 to the first heat exchanger 1.
The working process of the water source heat pump system taking carbon dioxide as secondary refrigerant in the embodiment is as follows:
in a refrigeration working condition, liquid carbon dioxide is conveyed to the second heat exchanger 4 of the heat pump system through the liquid pipeline 10 by the carbon dioxide circulating pump 7, and exchanges heat with a gaseous refrigerant in the second heat exchanger 4; the gaseous refrigerant is condensed into high-temperature and high-pressure liquid, passes through a sixth one-way valve 56 (at the moment, a fifth one-way valve 55 is in a reverse non-conduction state, and a third expansion valve 63 is in a closed state), then enters a second expansion valve 62 for throttling and pressure reduction to form a low-temperature and low-pressure gas-liquid mixture, enters the first heat exchanger 1, exchanges heat with a medium in the first heat exchanger 1, absorbs the heat of the medium, and is evaporated into low-temperature and low-pressure gas; the refrigerant enters the compressor 2 after passing through the four-way valve 3, is compressed into high-temperature and high-pressure gas by the compressor 2, and then enters the second heat exchanger 4 through the four-way valve 3 to complete the refrigeration cycle; after heat exchange between the carbon dioxide liquid and the gaseous refrigerant, the carbon dioxide liquid absorbs heat and evaporates into gas, the gas enters the third heat exchanger 9 through the gas pipeline 8 to exchange heat with the surface water source, the carried heat is released into the surface water source, and the carbon dioxide is condensed into liquid to continue to participate in circulation.
When the heating working condition is met, the third heat exchanger 9 is immersed in a surface water source, carbon dioxide liquid exchanges heat with surface water, the carbon dioxide absorbs heat and vaporizes, low-level heat energy of the surface water source is transmitted to the heat pump second heat exchanger 4 through the gas pipeline 8, liquid refrigerants exchange heat with the carbon dioxide gas in the second heat exchanger 4, the carbon dioxide releases heat and condenses, the condensed carbon dioxide liquid is transmitted to the third heat exchanger 9 through the carbon dioxide circulating pump 7 through the liquid pipeline 10, heat absorption and evaporation are continued, and cold carrying circulation is completed; the liquid refrigerant in the second heat exchanger 4 absorbs heat to become low-temperature low-pressure gas, returns to the compressor 2 through the four-way valve 3, is compressed into high-temperature high-pressure gas by the compressor 2, enters the first heat exchanger 1 through the four-way valve 3, exchanges heat with the medium in the first heat exchanger 1, transfers heat to the medium, is condensed into high-temperature high-pressure liquid, passes through the fifth one-way valve 55 (at this time, the sixth one-way valve 56 is in a reverse non-conduction state, and the second expansion valve 62 is in a closed state), then enters the third expansion valve 63 to be throttled and reduced to become low-temperature low-pressure gas-liquid mixture, and returns to the second.
In one embodiment, the carbon dioxide circulation pump is a centrifugal circulation pump or a positive displacement circulation pump.
In one embodiment, the carbon dioxide circulation pump 7 is a bidirectional pump, and the carbon dioxide circulation pump 7 is configured as a bidirectional pump to switch the flow direction of the carbon dioxide in the liquid pipeline 10, so that the liquid carbon dioxide in the liquid pipeline 10 is conveyed from the third heat exchanger 9 to the second heat exchanger 4, or the liquid carbon dioxide in the liquid pipeline 10 is conveyed from the second heat exchanger 4 to the third heat exchanger 9. It is also possible to dispense with the use of a bidirectional pump in the liquid line 10, in which case it is necessary to provide a line for reversing, a valve, and the like around the carbon dioxide circulation pump 7.
In one embodiment, the carbon dioxide-based water source heat pump system may include a plurality of compressors 2, and the plurality of compressors 2 may be connected in series or in parallel.
In one embodiment, the compressor 2 is an oil compressor or an oil-free compressor; specifically, the compressor 2 is a general centrifugal compressor, an air suspension centrifugal compressor, a magnetic suspension centrifugal compressor, a screw compressor, or the like.
In one embodiment, the carbon dioxide-based coolant-based water source heat pump system can include a plurality of first heat exchangers 1 and a plurality of second heat exchangers 4.
In one embodiment, the first heat exchanger 1 and the second heat exchanger 4 are one or more of a double tube heat exchanger, a shell and tube heat exchanger, and a plate and shell heat exchanger.
In one embodiment, the third heat exchanger 9 is a finned tube heat exchanger. The fin tube type heat exchanger is used as the third heat exchanger 9, so that the heat exchange area is increased under the condition of the same size, and the heat exchange effect is enhanced.
As shown in fig. 3, in one embodiment the third heat exchanger 9 is provided with cleaning brushes 12. The cleaning brush 12 is a self-cleaning device for a heat exchanger. The cleaning brushes 12 can be rotated and slid back and forth between the respective heat exchange lines 11 of the third heat exchanger 9 by means of a motor and transmission means (not shown in the figures). When the dirt and impurities on the surface of the heat exchange pipeline 11 are deposited to a certain degree, the cleaning brush 12 can be started to clean the surface of the third heat exchanger 9.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A water source heat pump system taking carbon dioxide as secondary refrigerant is characterized by comprising a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger; four openings of the four-way valve are respectively connected with an exhaust port of the compressor, an air suction port of the compressor, the first heat exchanger and the second heat exchanger, and a throttling element is arranged between the first heat exchanger and the second heat exchanger; the second heat exchanger is provided with a refrigerant passage and a carbon dioxide heat exchange passage, two openings of the carbon dioxide heat exchange passage are respectively connected with the third heat exchanger through a gas pipeline and a liquid pipeline, the third heat exchanger is used for being immersed in a ground water source, and the liquid pipeline is provided with a carbon dioxide circulating pump.
2. The water source heat pump system using carbon dioxide as coolant of claim 1, wherein the throttling element is an electronic expansion valve.
3. The water source heat pump system using carbon dioxide as secondary refrigerant according to claim 2, wherein the throttling element is a first expansion valve, the second heat exchanger is communicated with the first end of the first expansion valve through a fourth one-way valve, the fourth one-way valve is communicated in the direction from the second heat exchanger to the first expansion valve, the second end of the first expansion valve is communicated with the first heat exchanger through a third one-way valve, and the third one-way valve is communicated in the direction from the first expansion valve to the first heat exchanger; the first heat exchanger is communicated with the first end of the first expansion valve through a second one-way valve, the conduction direction of the second one-way valve is from the first heat exchanger to the first expansion valve, the second end of the first expansion valve is communicated with the second heat exchanger through the first one-way valve, and the conduction direction of the first one-way valve is from the first expansion valve to the second heat exchanger.
4. The water source heat pump system using carbon dioxide as secondary refrigerant according to claim 2, wherein the throttling element is a second expansion valve and a third expansion valve, the second expansion valve and the third expansion valve are arranged in series between the first heat exchanger and the second heat exchanger, two ends of the second expansion valve are connected in parallel with a fifth check valve, two ends of the third expansion valve are connected in parallel with a sixth check valve, the communication directions of the fifth check valve and the third expansion valve are from the first heat exchanger to the second heat exchanger, and the communication directions of the sixth check valve and the second expansion valve are from the second heat exchanger to the first heat exchanger.
5. The water source heat pump system taking carbon dioxide as secondary refrigerant according to claim 1, wherein the carbon dioxide circulating pump is a centrifugal circulating pump or a positive displacement circulating pump.
6. The water source heat pump system taking carbon dioxide as secondary refrigerant according to any one of claims 1 to 5, characterized in that the number of the compressors is multiple, and the multiple compressors are connected in parallel.
7. The water source heat pump system taking carbon dioxide as secondary refrigerant according to claim 6, wherein the compressor is a common centrifugal compressor, an air suspension centrifugal compressor, a magnetic suspension centrifugal compressor or a screw compressor.
8. The water source heat pump system taking carbon dioxide as secondary refrigerant according to claim 1, wherein the first heat exchanger and the second heat exchanger are a double-pipe heat exchanger, a shell-and-tube heat exchanger or a plate-and-shell heat exchanger.
9. The water source heat pump system using carbon dioxide as secondary refrigerant according to any one of claims 1 to 5, wherein the third heat exchanger is a finned tube heat exchanger.
10. The water source heat pump system taking carbon dioxide as secondary refrigerant according to any one of claims 1 to 5, wherein the third heat exchanger is provided with a cleaning brush.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020501992.7U CN212320123U (en) | 2020-04-08 | 2020-04-08 | Water source heat pump system using carbon dioxide as secondary refrigerant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020501992.7U CN212320123U (en) | 2020-04-08 | 2020-04-08 | Water source heat pump system using carbon dioxide as secondary refrigerant |
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