Solar-assisted carbon dioxide circulating heat supply system

Abstract

The invention belongs to the technical field of circulating heat supply systems, and discloses a solar-assisted carbon dioxide circulating heat supply system. The solar-assisted carbon dioxide circulating heat supply system comprises a heat collector, a compressor and a condenser which are sequentially communicated through a circulating pipeline, the condenser is arranged at a user heat supply end, and the heat collector is a solar direct expansion type heat collector; a temperature difference heating piece is arranged on the heat collector, the hot end of the temperature difference heating piece is arranged at the position close to the inlet end of the condenser, and the cold end of the temperature difference heating piece is arranged at the position close to the inlet end of the heat collector. According to the heat supply system, by arranging the temperature difference heating piece, when the solar radiation intensity is too low and the heat exchange medium cannot be heated to be evaporated, low-temperature radiation is conducted on the heat exchange medium, so that normal proceeding of system circulation is guaranteed, and the heat supply continuity and the heat supply effect of the heat supply system are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of circulating heating systems, and in particular relates to a solar-assisted carbon dioxide circulating heating system. Background Art

[0002] An air source heat pump is a heating system that obtains low-temperature heat source by storing heat in the air, and then turns it into a high-temperature heat source after efficient heat collection and integration by the system.

[0003] In line with the development trend of energy conservation, economy and environmental protection, the heating system using solar collectors as the evaporation end of the heating system has been rapidly promoted and developed. However, the conventional heating system using solar collectors as the evaporation end of the heating system has high requirements for the intensity of solar radiation. On rainy days, early mornings and evenings when the sunlight is weak, the heating system cannot generate heat and can only circulate using pre-stored heat energy storage, which often has low thermal power and short duration. The existing technology has also made some improvements to this problem, but the effect is not good and has not been able to effectively solve the problem.

[0004] Therefore, there is an urgent need to provide a solar-assisted carbon dioxide cycle heating system that can increase the effective operating time and provide more stable heating while ensuring higher overall system efficiency and lower operating costs, so as to overcome the above problems.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the heating system in the prior art, such as low operating stability and short effective operating time, and the purpose is to provide a solar-assisted carbon dioxide circulation heating system.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a solar-assisted carbon dioxide circulation heating system, comprising a collector, a compressor and a condenser connected in sequence through a circulation pipeline, wherein the condenser is arranged at the user's heating end, and is characterized in that the collector is a solar direct expansion collector;

[0008] The collector is provided with a temperature difference heating sheet, the hot end of the temperature difference heating sheet is arranged at a position close to the inlet end of the condenser, and the cold end of the temperature difference heating sheet is arranged at a position close to the inlet end of the collector.

[0009] According to one embodiment of the present invention, a solar radiation intensity measuring instrument is provided on the sun-facing side of the collector, and the solar radiation intensity measuring instrument is configured to detect the solar radiation intensity;

[0010] When the solar radiation intensity detected by the solar radiation intensity measuring instrument is less than a preset minimum radiation intensity standard, the temperature difference heating plate is controlled to turn on.

[0011] According to one embodiment of the present invention, an electric regulating valve is further provided on the circulation pipeline, and the electric regulating valve is configured to control the opening size of the internal passage of the circulation pipeline;

[0012] The solar-assisted carbon dioxide cycle heating system further includes: a temperature detection device, the temperature detection device is arranged at a position close to the inlet end of the condenser, and the temperature detection device is configured to detect the temperature of the heat exchange medium; the heat exchange medium is carbon dioxide;

[0013] When the temperature detected by the temperature detection device is lower than a preset minimum temperature standard, the electric regulating valve is controlled to operate, thereby adjusting the opening size of the internal passage of the circulation pipeline.

[0014] According to one embodiment of the present invention, the heat collector comprises:

[0015] A copper tube, wherein a passage for a heat exchange medium to flow is provided inside the copper tube;

[0016] A glass cover tube, wherein the glass cover tube is disposed on the outer side of the copper tube;

[0017] The heat absorbing coating is attached to a side of the copper tube close to the glass cover tube, and / or the heat absorbing coating is attached to a side of the glass cover tube close to the copper tube.

[0018] According to an embodiment of the present invention, there are a plurality of copper tubes, and the plurality of copper tubes are arranged in parallel.

[0019] According to an embodiment of the present invention, the area between the glass cover tube and the copper tube is in a vacuum state.

[0020] According to one embodiment of the present invention, the solar-assisted carbon dioxide cycle heating system further comprises an information processing unit and an information display unit, and the information processing unit and the information display unit are electrically connected;

[0021] The information processing unit has preset minimum radiation intensity standards and minimum temperature standards.

[0022] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0023] 1) In the present invention, by providing the temperature difference heating sheet, when the solar radiation intensity is too low to heat the heat exchange medium to make it evaporate, the heat exchange medium is radiated at a low temperature, thereby ensuring the normal circulation of the system and the heating effect of the heating system;

[0024] 2) In the present invention, by setting the electric regulating valve, the opening size of the internal passage of the circulation pipeline is adjusted, and the pressure and flow rate in the pipeline are controlled to ensure that the heat exchange is more sufficient and the heat supply is more stable.

[0025] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a solar-assisted carbon dioxide cycle heating system according to an embodiment of the present invention;

[0028] Figure 2 This is a flow chart of information transmission between some components in an embodiment of the present invention.

[0029] Description of the main components in the figure:

[0030] 1. Circulation pipeline; 2. Collector; 21. Copper tube; 22. Glass cover tube; 23. Heat-absorbing coating; 3. Compressor; 4. Condenser; 5. Electric regulating valve; 6. Information processing unit; 7. Information display unit; 8. Solar radiation intensity measuring instrument; 9. Temperature detection device.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1 to Figure 2 As shown, a solar-assisted carbon dioxide circulation heating system of the present invention comprises a collector 2, a compressor 3 and a condenser 4 which are sequentially connected through a circulation pipeline 1, wherein the condenser 4 is arranged at the user's heating end, and the collector 2 is a solar direct expansion collector;

[0036] The collector 2 is provided with a temperature differential heating plate, the hot end of the temperature differential heating plate is arranged at a position close to the inlet end of the condenser 4 , and the cold end of the temperature differential heating plate is arranged at a position close to the inlet end of the collector 2 .

[0037] In the present invention, by providing the temperature difference heating plate, when the solar radiation intensity is too low to heat the heat exchange medium to make it evaporate, the heat exchange medium is radiated at low temperature, thereby ensuring the normal circulation of the system and the heating effect of the heating system.

[0038] The hot end of the temperature difference heating plate transfers the generated heat (heat conduction, heat radiation) to the heat exchange medium to supply heat to the user's heating end.

[0039] Please see attached Figure 1 In a specific implementation of this embodiment, a solar radiation (intensity) measuring instrument is provided on the sun-facing side of the collector 2, and the solar radiation intensity measuring instrument 8 is configured to detect the solar radiation intensity;

[0040] When the solar radiation intensity detected by the solar radiation intensity measuring instrument 8 is lower than the preset minimum radiation intensity standard, the temperature difference heating plate is controlled to be turned on.

[0041] The solar radiation intensity measuring instrument 8 is an instrument for measuring the intensity of solar radiation. The basic principle is to convert the received solar radiation energy into other forms of energy, such as heat energy and electrical energy, with minimal loss, and to make an estimated measurement based on the conversion loss. Its specific structure is common knowledge in this field and will not be elaborated here.

[0042] Please see attached Figure 1 In a specific implementation of this embodiment, an electric regulating valve 5 is further provided on the circulation pipeline 1, and the electric regulating valve 5 is configured to control the opening size of the internal passage of the circulation pipeline 1;

[0043] The solar-assisted carbon dioxide cycle heating system further includes: a temperature detection device 9, which is disposed at a position close to the inlet end of the condenser 4, and is configured to detect the temperature of the heat exchange medium at the inlet end of the condenser 4; the heat exchange medium is carbon dioxide;

[0044] When the temperature detected by the temperature detection device 9 is lower than the preset minimum temperature standard, the electric regulating valve 5 is controlled to operate, thereby adjusting the opening size of the internal passage of the circulation pipeline 1.

[0045] In the present invention, by providing the electric regulating valve 5, the opening size of the internal passage of the circulation pipeline 1 is adjusted, and the pressure and flow rate in the pipeline are controlled to ensure that the heat exchange is more sufficient and the heat supply is more stable.

[0046] For traditional air source heat pump heating systems that use air as a medium, their efficiency will drop significantly as the temperature decreases. For extremely cold areas, the temperature can usually reach minus 15°C or even lower, and some heat pumps may not work effectively. To solve the above problems, this application provides an alternative solution using higher purity carbon dioxide as a heat exchange medium. Carbon dioxide working fluid is not only environmentally friendly, but also has a lower evaporation temperature, ensuring the normal operation of the system at low temperatures.

[0047] In a specific implementation of this embodiment, when the temperature detected by the temperature detection device 9 is lower than the preset minimum temperature standard, the electric regulating valve 5 is controlled to operate, and the opening size of the internal passage of the circulation pipeline 1 is controlled to increase. This control increases the diameter of part of the internal pipeline of the circulation pipeline 1. According to the Bernoulli principle, this control increases the pressure in the pipe and slows down the flow rate, so that the medium heat exchange is carried out for a longer time within the unit area, thereby ensuring the heat exchange effect.

[0048] It should be noted that when the light radiation intensity is high enough, the collector 2 will pre-store part of the absorbed heat energy (for example, water heat storage, phase change material heat storage, solid heat storage, etc.) for later use. The design provided in this application can be used alone or in conjunction with the use of the pre-stored energy.

[0049] Specifically, when the pre-stored energy is insufficient and the heating effect is poor, the temperature difference heating plate serves as a main heat generating component or as a secondary heat generating component to assist the pre-stored energy in heating.

[0050] In another specific implementation of this embodiment, when the pre-stored energy is sufficient and meets the use requirements and the use effect is good, the temperature difference heating sheet may not be activated;

[0051] Specifically, when the solar radiation intensity detected by the solar radiation intensity measuring instrument 8 is less than the preset minimum radiation intensity standard, the temperature difference heating plate is not directly controlled to be turned on, but the temperature is further detected;

[0052] On this basis, when the temperature detected by the temperature detection device 9 is lower than the preset minimum temperature standard, the temperature difference heating plate is controlled to be turned on.

[0053] Specifically, in this application, carbon dioxide (heat exchange medium) is pressurized by compressor 3 and enters condenser 4, where carbon dioxide vapor condenses into liquid, releases heat, and provides heating to users;

[0054] Liquid carbon dioxide enters the electric regulating valve 5, and the electric regulating valve 5 adjusts the working medium pressure;

[0055] A solar direct blast collector is used to replace the evaporator of the heat pump cycle, and the working fluid evaporates and enters the compressor 3.

[0056] Please see attached Figure 1 In a specific implementation of this embodiment, the collector 2 includes:

[0057] A copper tube 21, wherein a passage for a heat exchange medium to flow is provided inside the copper tube 21;

[0058] A glass cover tube 22, wherein the glass cover tube 22 is covered on the outer side of the copper tube 21;

[0059] The heat absorbing coating 23 is attached to a side of the copper tube 21 close to the glass cover tube 22 , and / or the heat absorbing coating 23 is attached to a side of the glass cover tube 22 close to the copper tube 21 .

[0060] In a specific implementation of this embodiment, the glass cover tube 22 is a square tube (the cross section perpendicular to its axis is square), or,

[0061] The glass cover tube 22 is a cylindrical tube (the cross section perpendicular to the axis direction thereof is circular).

[0062] In a specific implementation of this embodiment, the heat-absorbing coating 23 can be a metal oxide coating (such as an aluminum-nitrogen-oxygen (Al-NO) coating, an iron-manganese-chromium-oxygen (Fe-Mn-Cr-O) coating, etc.), or a carbon-based coating (such as a carbon nanotube coating, a graphene coating, etc.), or other material coatings that can efficiently absorb solar radiation and reduce heat loss (lower emissivity).

[0063] In a specific implementation of this embodiment, during the day, the collector 2 absorbs heat through solar energy, and at night the outside temperature drops. The collector 2 is well isolated from heat loss, and at the same time adjusts the carbon dioxide pressure to a low evaporation temperature (lower than the conventional evaporation temperature), and radiates the low-temperature evaporation working fluid through the copper tube.

[0064] In a specific implementation of this embodiment, a plurality of copper tubes 21 are provided, the inner and outer diameters of the plurality of copper tubes 21 are equal, and the plurality of copper tubes 21 are arranged in parallel and at intervals.

[0065] In a specific implementation of this embodiment, the area between the glass cover tube 22 and the copper tube 21 is in a vacuum state.

[0066] Please see attached Figure 2 In a specific implementation of this embodiment, the solar-assisted carbon dioxide cycle heating system further includes an information processing unit 6 and an information display unit 7, wherein the information processing unit 6 and the information display unit 7 are electrically connected; the information processing unit 6 is electrically connected to the solar radiation intensity measuring instrument 8 and the temperature detection device 9;

[0067] The information processing unit 6 has preset minimum radiation intensity standards and minimum temperature standards.

[0068] The information processing unit 6 compares the solar radiation intensity detected by the solar radiation intensity measuring instrument 8 with the preset minimum radiation intensity standard, and when it is determined that the solar radiation intensity detected by the solar radiation intensity measuring instrument 8 is less than the preset minimum radiation intensity standard, controls the temperature difference heating plate to turn on;

[0069] The information processing unit 6 compares the temperature detected by the temperature detection device 9 with a preset minimum temperature standard, and when it is determined that the temperature detected by the temperature detection device 9 is lower than the preset minimum temperature standard, controls the electric regulating valve 5 to operate.

[0070] The information display unit 7 displays the solar radiation intensity detected by the solar radiation intensity measuring instrument 8, and / or displays the temperature detected by the temperature detection device 9, or other information (for example, the pressure and flow rate of the circulation pipeline 1).

[0071] The solar-assisted carbon dioxide circulation heating system provided by the present invention, by providing the temperature difference heating plate, performs low-temperature radiation compensation on the heat exchange medium when the solar radiation intensity is too low to heat the heat exchange medium to make it evaporate, thereby ensuring the normal operation of the system circulation and ensuring the heating continuity and heating effect of the heating system.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A solar-assisted carbon dioxide circulation heating system, comprising a collector (2), a compressor (3) and a condenser (4) connected in sequence through a circulation pipeline (1), wherein the condenser (4) is arranged at a user's heating end, and is characterized in that: The heat collector (2) is a solar direct expansion heat collector; The collector (2) is provided with a temperature differential heating plate, the hot end of the temperature differential heating plate is arranged at a position close to the inlet end of the condenser (4), and the cold end of the temperature differential heating plate is arranged at a position close to the inlet end of the collector (2).

2. A solar-assisted carbon dioxide circulation heating system according to claim 1, characterized in that: A solar radiation intensity measuring instrument is provided on the sun-facing side of the heat collector (2), and the solar radiation intensity measuring instrument is configured to detect the intensity of solar radiation irradiated on the heat collector (2); When the solar radiation intensity detected by the solar radiation intensity measuring instrument is less than a preset minimum radiation intensity standard, the temperature difference heating plate is controlled to turn on.

3. A solar-assisted carbon dioxide circulation heating system according to claim 2, characterized in that: The circulation pipeline (1) is also provided with an electric regulating valve (5), and the electric regulating valve (5) is configured to control the opening size of the internal passage of the circulation pipeline (1); The solar-assisted carbon dioxide cycle heating system further comprises: a temperature detection device, the temperature detection device being arranged at a position close to the inlet end of the condenser (4), the temperature detection device being configured to detect the temperature of the heat exchange medium; The heat exchange medium is carbon dioxide; When the temperature detected by the temperature detection device is lower than a preset minimum temperature standard, the electric regulating valve (5) is controlled to operate, thereby adjusting the opening size of the internal passage of the circulation pipeline (1).

4. A solar-assisted carbon dioxide circulation heating system according to claim 3, characterized in that: The heat collector (2) comprises: A copper tube (21), wherein a passage for a heat exchange medium to flow is provided inside the copper tube (21); A glass cover tube (22), wherein the glass cover tube (22) is covered on the outer side of the copper tube (21); The heat absorbing coating (23) is attached to a side of the copper tube (21) close to the glass cover tube (22), and / or the heat absorbing coating (23) is attached to a side of the glass cover tube (22) close to the copper tube (21).

5. A solar-assisted carbon dioxide circulation heating system according to claim 4, characterized in that: A plurality of the copper tubes (21) are provided, and the plurality of the copper tubes (21) are arranged in parallel.

6. A solar-assisted carbon dioxide cycle heating system according to claim 4, characterized in that: The area between the glass cover tube (22) and the copper tube (21) is in a vacuum state.

7. A solar-assisted carbon dioxide cycle heating system according to any one of claims 3 to 6, characterized in that: The solar-assisted carbon dioxide cycle heating system further comprises an information processing unit (6) and an information display unit (7), wherein the information processing unit (6) and the information display unit (7) are electrically connected; The information processing unit (6) has preset minimum radiation intensity standards and minimum temperature standards.

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