Solar coupling system based on two-stage cascade heat pump

Abstract

The utility model discloses a solar coupling system based on a two-stage cascade heat pump, which comprises an air type two-stage cascade heat pump, the air type two-stage cascade heat pump comprises a solar coupling system, a low-temperature stage loop and a high-temperature stage loop, the solar coupling system comprises PCM air type solar energy and a solar fan connected with the PCM air type solar energy, and the high-temperature stage loop is connected with the PCM air type solar energy. One side of the PCM air type solar energy is connected with a fin type heat exchanger, the low-temperature stage loop comprises a low-temperature evaporator, the low-temperature evaporator is in coupling connection with the fin type heat exchanger, one end of the low-temperature evaporator is connected with a low-temperature gas-liquid separator, one side of the gas-liquid separator is connected with a low-temperature compressor, and the low-temperature compressor is connected with the high-temperature stage loop; solar energy is effectively captured and converted into heat energy which can be used by the system through the synergistic effect of PCM air type solar energy and the solar fan, so that the heat energy can be converted more smoothly by means of external heat energy in a low-temperature environment, and normal operation of the two-stage cascade heat pump is helped.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump heating, in particular to a solar energy coupling system based on a double-stage cascade heat pump. Background Art

[0002] An air source heat pump is a device that uses air as a low-temperature heat source to transfer heat energy to a high-temperature heat source to achieve heating. In the past, due to living habits and energy prices, most coal-producing provinces in northern regions such as the Northwest, Northeast China, and Inner Mongolia used coal-fired boilers for heating in their daily lives and production. In particular, heating for daily life in fringe urban areas, agricultural greenhouses, and pastoral greenhouses all rely mainly on coal-fired boilers to provide heat. Compared with heat pumps that use clean energy, this runs counter to the concept of environmental protection.

[0003] In the cold winter, as the outdoor temperature drops, the heating capacity of ordinary single-stage heat pumps decays rapidly, not only greatly reducing the heating efficiency but also increasing the operating costs. Although common traditional heat pumps have strong low-temperature resistance and high heating efficiency and can adapt to severe cold, they are prone to frost and freezing during operation. As a result, traditional heat pump systems may face the problem of decreased efficiency when increasing the temperature, resulting in their heating limitations under low-temperature conditions. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the traditional heat pump is prone to frost during operation, which may lead to the problem of reduced efficiency when the temperature is increased.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions: Provide a solar coupling system based on a two-stage cascade heat pump, including an air-type two-stage cascade heat pump, the air-type two-stage cascade heat pump including a solar coupling system, a low-temperature stage loop and a high-temperature stage loop, the solar coupling system including a PCM air-type solar energy, a solar wind turbine connected to the PCM air-type solar energy, one side of the PCM air-type solar energy is connected to a fin heat exchanger, the low-temperature stage loop includes a low-temperature evaporator, the low-temperature evaporator is coupled to the fin heat exchanger, one end of the low-temperature evaporator is connected to a low-temperature gas-liquid separator, one side of the gas-liquid separator is connected to a low-temperature compressor, and the low-temperature compressor is connected to the high-temperature stage loop; one side of the low-temperature evaporator is connected to a low-temperature throttling device, one side of the low-temperature throttling device is connected to a low-temperature filter, one side of the low-temperature filter is connected to an intermediate heat exchanger, and one side of the intermediate heat exchanger is connected to the high-temperature stage loop.

[0006] Furthermore, the high-temperature stage loop includes a first shell and tube heat exchanger, one end of the first shell and tube heat exchanger is connected to the intermediate heat exchanger, and a high-temperature gas-liquid separator and a high-temperature compressor are connected between the intermediate heat exchanger and the first shell and tube heat exchanger.

[0007] Furthermore, a high-temperature throttling device and a high-temperature filter are connected between the intermediate heat exchanger and the first shell and tube heat exchanger.

[0008] Furthermore, one end of the low-temperature evaporator is connected to a four-way valve, valve port No. 3 of the four-way valve is connected to the low-temperature evaporator, valve port No. 2 of the four-way valve is connected to the low-temperature gas-liquid separator, valve port No. 1 of the four-way valve is connected to the low-temperature compressor, and valve port No. 4 of the four-way valve is connected to the high-temperature stage loop.

[0009] Further, the high temperature stage loop includes a second shell and tube heat exchanger, the second shell and tube heat exchanger is connected to the fourth valve port of the four-way valve, the second shell and tube heat exchanger is connected to the first shell and tube heat exchanger, and the second shell and tube heat exchanger is connected to the intermediate heat exchanger.

[0010] Furthermore, a second low-temperature compressor is provided in parallel on the side of the low-temperature compressor.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. By adopting a two-stage cascade heat pump structure, the system achieves high-efficiency conversion of solar energy. Solar energy is effectively captured and converted into heat energy that can be used by the system through the synergistic effect of PCM air solar energy and solar wind turbines, so that it can use external heat energy to convert energy more smoothly in a low-temperature environment, helping the two-stage cascade heat pump to operate normally.

[0013] 2. Through the solar coupling system, the system realizes the effective use of phase change materials (PCM) and improves the comprehensive utilization efficiency of energy. The application of PCM enables the system to store and release heat more flexibly and realize the effective use of solar energy for a longer period of time.

[0014] 3. The synergy between the high-temperature and low-temperature loops and the design of the intermediate heat exchanger help maintain the stability of the system. In addition, the reliability of the system is further improved by setting up a low-temperature compressor and a second low-temperature compressor in parallel.

[0015] 4. The system uses four-way valves, throttling devices, filters and other devices to achieve fine regulation and control of the fluid. This helps to maintain the superior performance of the system under different working conditions and improves the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] In the figure: 1-PCM air solar energy, 2-solar energy fan, 3-fin heat exchanger, 4-low temperature evaporator, 5-low temperature gas-liquid separator, 6-low temperature compressor, 7-low temperature throttling device, 8-low temperature filter, 9-intermediate heat exchanger, 10-first shell and tube heat exchanger, 11-high temperature gas-liquid separator, 12-high temperature compressor, 13-high temperature throttling device, 14-high temperature filter, 15-four-way valve, 16-second shell and tube heat exchanger, 17-second low temperature compressor. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] Combination Figure 1A solar coupling system based on a two-stage cascade heat pump is shown, including an air-type two-stage cascade heat pump, the air-type two-stage cascade heat pump includes a solar coupling system, a low-temperature stage loop and a high-temperature stage loop, the solar coupling system includes a PCM air-type solar energy 1, a solar wind turbine 2 connected to the PCM air-type solar energy 1, one side of the PCM air-type solar energy 1 is connected to a fin heat exchanger 3, the low-temperature stage loop includes a low-temperature evaporator 4, the low-temperature evaporator 4 is coupled to the fin heat exchanger 3, one end of the low-temperature evaporator 4 is connected to a low-temperature gas-liquid separator 5, one side of the gas-liquid separator 5 is connected to a low-temperature compressor 6, and the low-temperature compressor 6 is connected to the high-temperature stage loop; one side of the low-temperature evaporator 4 is connected to a low-temperature throttling device 7, one side of the low-temperature throttling device 7 is connected to a low-temperature filter 8, and the low-temperature filter 8 is connected to the low-temperature evaporator 4. An intermediate heat exchanger 9 is connected to one side of the filter 8, and a high-temperature loop is connected to one side of the intermediate heat exchanger 9; when in use, the PCM air solar energy 1 is a system that uses phase change material PCM to store and release thermal energy. It is connected to the solar wind turbine 2 to convert solar energy into thermal energy in the air flow. One side of the PCM air solar energy 1 is connected to the fin heat exchanger 3 for effectively transferring heat to the air, which helps to improve the thermal efficiency of the system; the solar energy is transferred to the low-temperature evaporator 4 through the fin heat exchanger 3 to evaporate the working medium, and the evaporated working medium is connected to the low-temperature gas-liquid separator 5 to separate gas and liquid. The gas is compressed by the low-temperature compressor 6 and then connected to the high-temperature loop. The intermediate heat exchanger 9 transfers the heat in the low-temperature loop to the high-temperature loop to achieve comprehensive utilization of energy;

[0021] Among them, the high-temperature loop includes a first shell and tube heat exchanger 10, one end of the first shell and tube heat exchanger 10 is connected to the intermediate heat exchanger 9, a high-temperature gas-liquid separator 11 and a high-temperature compressor 12 are connected between the intermediate heat exchanger 9 and the first shell and tube heat exchanger 10, a high-temperature throttling device 13 and a high-temperature filter 14 are connected between the intermediate heat exchanger 9 and the first shell and tube heat exchanger 10, one end of the low-temperature evaporator 4 is connected to the four-way valve 15, the high-temperature loop includes a second shell and tube heat exchanger 16, the second shell and tube heat exchanger 16 is connected to the fourth valve port of the four-way valve 15, the second shell and tube heat exchanger 16 is connected to the first shell and tube heat exchanger 10, and the second shell and tube heat exchanger 16 is connected to the middle The first shell and tube heat exchanger 10 and the intermediate heat exchanger 9 are connected; when in use, a high-temperature gas-liquid separator 11 is connected between the first shell and tube heat exchanger 10 and the intermediate heat exchanger 9 to separate the gas and liquid. The gas is compressed by the high-temperature compressor 12 and then transmitted to the first shell and tube heat exchanger 10. The setting of the high-temperature throttling device 13 and the high-temperature filter 14 helps to regulate the fluid in the high-temperature loop to ensure the efficient operation of the system. The second shell and tube heat exchanger 16 is connected to the low-temperature loop to realize energy recovery. A second low-temperature compressor 17 is provided in parallel on the side of the low-temperature compressor 6. By arranging the low-temperature compressor 6 and the second low-temperature compressor 17 in parallel, the reliability of the system is further improved.

[0022] Working principle: The solar wind turbine 2 converts the heat in the PCM air solar energy 1 into heat energy in the air flow, and the heat energy is transferred to the low-temperature evaporator 4 through the fin heat exchanger 3 to evaporate the working medium. The evaporated working medium enters through the No. 3 valve port of the four-way valve 15, and is transmitted to the low-temperature gas-liquid separator 5 from the No. 2 valve port to separate the gas and liquid. The gas is compressed by the low-temperature compressor 6, and then enters from the No. 1 valve port, and then is exported to the second shell and tube heat exchanger 16 through the No. 4 valve port, and then enters the first shell and tube heat exchanger 10 from the second shell and tube heat exchanger 16 for heat transfer; while in the high-temperature stage loop, the working medium absorbs heat from the intermediate heat exchanger 9 and flows into the high-temperature gas-liquid separator 11 to separate the gas and liquid. The gas is compressed by the high-temperature compressor 12 and then transmitted to the first shell and tube heat exchanger 10. The liquid then returns to the intermediate heat exchanger 9 through the high-temperature filter 14 and the high-temperature throttling device 13 to form a reflux.

[0023] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0024] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A solar coupling system based on a two-stage cascade heat pump, comprising an air-type two-stage cascade heat pump, characterized in that: The air-type two-stage cascade heat pump comprises a solar coupling system, a low-temperature loop and a high-temperature loop. The solar coupling system comprises a PCM air-type solar energy (1) and a solar wind turbine (2) connected to the PCM air-type solar energy (1). One side of the PCM air-type solar energy (1) is connected to a fin heat exchanger (3). The low-temperature loop comprises a low-temperature evaporator (4). The low-temperature evaporator (4) is coupled to the fin heat exchanger (3). One end of the low-temperature evaporator (4) is connected to a low-temperature gas-liquid separator (5). One side of the gas-liquid separator (5) is connected to a low-temperature compressor (6). The low-temperature compressor (6) is connected to the high-temperature loop. One side of the low-temperature evaporator (4) is connected to a low-temperature throttling device (7). One side of the low-temperature throttling device (7) is connected to a low-temperature filter (8). One side of the low-temperature filter (8) is connected to an intermediate heat exchanger (9). One side of the intermediate heat exchanger (9) is connected to the high-temperature loop.

2. The solar coupling system based on a two-stage cascade heat pump according to claim 1, characterized in that: The high-temperature stage loop comprises a first shell and tube heat exchanger (10), one end of the first shell and tube heat exchanger (10) is connected to the intermediate heat exchanger (9), and a high-temperature gas-liquid separator (11) and a high-temperature compressor (12) are connected between the intermediate heat exchanger (9) and the first shell and tube heat exchanger (10).

3. The solar coupling system based on a two-stage cascade heat pump according to claim 2, characterized in that: A high-temperature throttling device (13) and a high-temperature filter (14) are connected between the intermediate heat exchanger (9) and the first shell and tube heat exchanger (10).

4. The solar coupling system based on a double-stage cascade heat pump according to claim 3 is characterized in that: One end of the low-temperature evaporator (4) is connected to a four-way valve (15), a No. 3 valve port of the four-way valve (15) is connected to the low-temperature evaporator (4), a No. 2 valve port of the four-way valve (15) is connected to the low-temperature gas-liquid separator (5), a No. 1 valve port of the four-way valve (15) is connected to the low-temperature compressor (6), and a No. 4 valve port of the four-way valve (15) is connected to the high-temperature stage loop.

5. The solar coupling system based on a two-stage cascade heat pump according to claim 4, characterized in that: The high-temperature stage loop comprises a second shell and tube heat exchanger (16), the second shell and tube heat exchanger (16) is connected to the fourth valve port of the four-way valve (15), the second shell and tube heat exchanger (16) is connected to the first shell and tube heat exchanger (10), and the second shell and tube heat exchanger (16) is connected to the intermediate heat exchanger (9).

6. The solar coupling system based on a two-stage cascade heat pump according to claim 5, characterized in that: A second low-temperature compressor (17) is provided in parallel on the side of the low-temperature compressor (6).

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