A jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system

Abstract

The present invention relates to a jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system, which includes a refrigerant system, a hot water system, and an integrated power generation and supply system. The system is composed of a compressor, a one-way valve, a fluorine-water heat exchanger, a two-phase ejector, a gas-liquid separator, an electronic expansion valve, a heat exchanger, a PVT array, a water pump, a DC converter, a municipal power grid, and an AC / DC inverter, thereby achieving cogeneration and stable energy supply. The present invention combines jet refrigeration technology with PVT heat pump technology, and the thermodynamic cycle process is improved, which can greatly reduce the throttling loss and superheating loss in the traditional steam compression cycle process and improve the system performance; at the same time, a low-injection rate method is used to supercool the refrigerant at the PVT array inlet, thereby ensuring the uniformity of the PVT array liquid supply and improving its heat exchange efficiency. The present invention makes full use of renewable energy solar energy, is energy-saving, efficient, and low-carbon, and promotes the transformation of the energy structure towards clean and sustainable development.

Description

Technical Field

[0001] The present invention belongs to the field of solar photovoltaic and thermal technology, and in particular to an ejection-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system. Technical Background

[0002] Solar energy, with its green, clean, inexhaustible and inexhaustible advantages, has been widely used in construction, industry, agriculture and other fields. Currently, photovoltaic thermal (PVT) technology effectively integrates solar photovoltaic technology and thermal technology, reducing the temperature of photovoltaic cells and improving photovoltaic power generation efficiency. At the same time, it can improve the comprehensive utilization rate of solar energy and achieve cogeneration of heat and power. However, due to the instability, intermittency and volatility of solar radiation, PVT technology has poor all-weather production capacity. In view of this, the industry has proposed PVT heat pump technology, which combines PVT technology with heat pump technology to ensure its all-weather production capacity. However, compared with PVT technology, the introduction of compressors in PVT heat pump technology will inevitably lead to high energy consumption in system operation, thereby limiting the large-scale application of this technology. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to use renewable energy solar energy as the heat source of the system, and rely on jet cooling technology, solar PVT technology, and heat pump technology to improve the quality and efficiency of the PVT heat pump system, and help promote the large-scale promotion and application of solar PVT heat pump technology.

[0004] To achieve the above objectives, the present invention provides an ejection-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system, which includes a refrigerant system, a hot water system, and an integrated power generation and supply system;

[0005] The refrigerant system mainly consists of a compressor 1, a one-way valve 2, a fluorine-water heat exchanger 3, a two-phase ejector 4, a gas-liquid separator 5, an electronic expansion valve 6, a heat exchanger 7, and a PVT array 8. The outlet of the compressor 1 is connected to the one-way valve 2, the fluorine-water heat exchanger 3, the two-phase ejector 4, and the gas-liquid separator 5 in sequence, and is divided into two paths through the gas-liquid separator 5. One path is separated from the top of the gas-liquid separator 5 and connected to the inlet of the compressor 1; the other path is separated into two paths from the bottom of the gas-liquid separator 5. One path is connected to the low-pressure inlet of the two-phase ejector 4 through the electronic expansion valve 6 and the heat exchanger 7, and the other path is connected to the inlet of the compressor 1 through the heat exchanger 7, the PVT array 8, and the gas-liquid separator 5.

[0006] Compressor 1 types include rotor type, scroll type, and piston type;

[0007] Fluorine-water heat exchangers 3 and 7 include flat plate, spiral plate, plate fin, immersed spiral tube, shell and tube, and shell and tube types;

[0008] The electronic expansion valve 6 can be replaced by a thermal expansion valve or a capillary tube;

[0009] The flow channel types of the heat exchange elements of the PVT array 8 include triangle, quadrilateral, hexagon, circle, diamond, spindle, teardrop, and honeycomb.

[0010] The hot water system is mainly composed of a fluorine-water heat exchanger 3 and a water pump 9. The water pump 9 is connected to the water side of the fluorine-water heat exchanger 3 via a water pipeline.

[0011] The integrated power generation and power supply system mainly consists of a PVT array 8, a DC converter 10, a municipal power grid 11, and an AC / DC inverter 12. The integrated power generation and power supply system is divided into two routes. One route is connected to the PVT array 8 and the DC converter 10, and the other route is connected to the municipal power grid 11 and the AC / DC inverter 12. The above two routes are connected to the compressor 1 and the water pump 9 after being combined through the outlet of the DC converter 10 and the outlet of the AC / DC inverter 12.

[0012] The types of solar cell elements in the PVT array 8 include monocrystalline silicon, polycrystalline silicon, copper indium gallium selenide, gallium arsenide, cadmium telluride, and perovskite;

[0013] The motors of the compressor 1 and the water pump 9 are DC driven, and their types include brushless DC, brushed DC, and permanent magnet DC.

[0014] Beneficial effects of the present invention:

[0015] The present invention comprehensively utilizes the short-wave radiation and long-wave radiation of solar energy, thereby improving the comprehensive utilization rate of renewable energy solar energy;

[0016] The present invention combines jet refrigeration technology with PVT heat pump technology, which can effectively reduce throttling loss and superheating loss in the traditional steam compression cycle process;

[0017] The present invention uses an ejector with a low ejection rate to achieve subcooling of the circulating working fluid at the inlet of the PVT array, thereby improving the liquid supply uniformity of the PVT array, increasing the enthalpy difference of the phase change working fluid per unit mass, and thus optimizing the heat exchange efficiency of the PVT array;

[0018] The system of the present invention is energy and power independent, energy-saving, high-efficiency, green and low-carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system of the present invention;

[0020] Numbers in the figure: 1-compressor, 2-check valve, 3-fluorine-water heat exchanger, 4-two-phase ejector, 5-gas-liquid separator, 6-electronic expansion valve, 7-heat exchanger, 8-PVT array, 9-water pump, 10-DC converter, 11-municipal power grid, 12-AC / DC inverter. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] like Figure 1 As shown, in this embodiment, an ejection-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system includes a refrigerant system, a hot water system, and an integrated power generation and supply system.

[0023] The refrigerant system mainly consists of a compressor 1, a one-way valve 2, a fluorine-water heat exchanger 3, a two-phase ejector 4, a gas-liquid separator 5, an electronic expansion valve 6, a heat exchanger 7, a PVT array 8 and a refrigerant pipeline;

[0024] The hot water system mainly consists of a fluorine-water heat exchanger 3 and a water pump 9 connected via a water pipeline;

[0025] The integrated power generation and power supply system mainly consists of a PVT array 8, a DC converter 10, a municipal power grid 11, and an AC / DC inverter 12 connected via a circuit.

[0026] This embodiment provides an ejection-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system, which can realize self-generation and self-use of electricity, supply of surplus electricity to the grid, and hot water supply.

[0027] like Figure 1As shown, the compressor 1, electronic expansion valve 6, and water pump 9 are turned on, the PVT array 8 is the evaporator, and the fluorine-water heat exchanger 3 is the condenser. The working principle is as follows: the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor 1 into a high-temperature and high-pressure gaseous refrigerant, enters the fluorine-water heat exchanger 3 through the one-way valve 2, and releases heat into the hot water system. The high-temperature and high-pressure gaseous refrigerant is then condensed into a medium-temperature and high-pressure liquid refrigerant, and then enters the two-phase ejector 4 to eject the low-pressure gas and become a medium-pressure gas-liquid two-phase refrigerant, and then undergoes gas-liquid separation. The refrigerant is separated into saturated gaseous refrigerant and saturated liquid refrigerant by the refrigerant separator 5. The saturated gaseous refrigerant returns to the compressor 1, while the saturated liquid refrigerant is divided into two paths: one path is throttled and reduced in pressure by the electronic expansion valve 6 to become a gas-liquid two-phase refrigerant. It then absorbs heat through the heat exchanger 7, becomes superheated refrigerant, and enters the two-phase ejector 4 for injection. The other path is cooled to a subcooled refrigerant after passing through the heat exchanger 7. It then enters the PVT array to absorb solar energy and air energy, boiling it into a gaseous refrigerant. After passing through the gas-liquid separator 5, it returns to the compressor 1. Driven by the water pump 9, the hot water enters the fluorine-water heat exchanger 3 to absorb heat, thus circulating and continuously heating it. In addition, the PVT array 8 cells absorb shortwave solar radiation and convert solar energy into DC power, which is then converted to DC 750V by the DC converter 10 for use by the compressor 1 and the water pump 9. If the power output of the PVT array 8 exceeds the system power consumption, the excess power is connected to the grid via the AC-DC inverter 12. If the power output of the PVT array 8 is less than the system power consumption, the grid is converted to DC 750V by the AC-DC inverter 12 for use by the compressor 1 and the water pump 9.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system, comprising a refrigerant system, a hot water system, and an integrated heat and power generation system; The refrigerant system is mainly composed of a compressor (1), a one-way valve (2), a fluorine-water heat exchanger (3), a two-phase ejector (4), a gas-liquid separator (5), an electronic expansion valve (6), a heat exchanger (7), and a PVT array (8). The outlet of the compressor (1) is connected to the one-way valve (2), the fluorine-water heat exchanger (3), the two-phase ejector (4), and the gas-liquid separator (5) in sequence, and is divided into two paths through the gas-liquid separator (5). One path is divided from the top of the gas-liquid separator (5) and connected to the inlet of the compressor (1); the other path is divided into two paths from the bottom of the gas-liquid separator (5). One path is connected to the low-pressure inlet of the two-phase ejector (4) through the electronic expansion valve (6) and the heat exchanger (7), and the other path is connected to the inlet of the compressor (1) through the heat exchanger (7), the PVT array (8), and the gas-liquid separator (5). The hot water system is mainly composed of a fluorine-water heat exchanger (3) and a water pump (9), and the water side of the fluorine-water heat exchanger (3) is connected to the water pump (9) via a water pipeline; The integrated power generation and power supply system mainly consists of a PVT array (8), a DC converter (10), a municipal power grid (11), and an AC / DC inverter (12). The integrated power generation and power supply system is divided into two routes, one route is connected to the PVT array (8) and the DC converter (10), and the other route is connected to the municipal power grid (11) and the AC / DC inverter (12). The two routes are connected to the compressor (1) and the water pump (9) after being combined through the outlet of the DC converter (10) and the outlet of the AC / DC inverter (12).

2. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1, characterized in that: The types of compressors (1) include rotor type, scroll type and piston type.

3. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1, characterized in that: The types of the fluorine-water heat exchanger (3) and the heat exchanger (7) include flat plate type, spiral plate type, plate rib type, immersed spiral tube type, sleeve type, and shell and tube type.

4. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1, characterized in that: The electronic expansion valve (6) can be replaced by a thermal expansion valve or a capillary tube.

5. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1, characterized in that: The types of solar cell elements of the PVT array (8) include single crystal silicon, polycrystalline silicon, copper indium gallium selenide, gallium arsenide, cadmium telluride, and perovskite.

6. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1, characterized in that: The flow channel types of the heat exchange elements of the PVT array (8) include triangle, quadrilateral, hexagon, circle, diamond, spindle, teardrop, and honeycomb.

7. The jet-type subcooling enthalpy-increasing solar PVT heat pump cogeneration system according to claim 1 or 2, characterized in that: The motors of the compressor (1) and the water pump (9) are DC driven, and their types include brushless DC, brushed DC, and permanent magnet DC.

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