Photovoltaic direct-drive air source ejector-compression combined cycle heat pump cogeneration system

Abstract

The present application relates to a kind of photovoltaic direct-drive air source injection-compression combined cycle heat pump cogeneration system, the system includes refrigerant system, hot water system, power generation / power supply system, by compressor, check valve, hot water heat exchanger, two-phase ejector, gas-liquid separator, electronic expansion valve, intermediate cooler, finned heat exchanger, water pump, photovoltaic array, direct-current converter, AC / DC inverter is formed, system can realize cogeneration.The present application introduces injection refrigeration technology into air source heat pump technology, to reduce the throttling loss and overheating loss of traditional vapor compression cycle process, improve system performance;While using the method of low injection rate to supercool finned heat exchanger inlet refrigerant, the uniformity of finned heat exchanger refrigerant distribution is guaranteed, and its heat exchange efficiency is improved.The present application makes full use of renewable energy solar energy and air energy, realizes electric energy self-production, energy saving, efficient, green, low carbon.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic direct-driven air source heat pumps, and in particular to a photovoltaic direct-driven air source injection-compression composite cycle heat pump cogeneration system. Technical Background

[0002] With the continuous improvement of people's living standards, hot water has become an indispensable part of homes and commercial facilities. In recent years, with the vigorous development of my country's energy conservation and carbon reduction efforts, hot water preparation equipment has gradually been replaced by renewable energy equipment instead of coal-fired boilers and gas-fired boilers. Among them, air energy is a renewable energy source with huge energy savings, cleanness and no pollution. Heat pump technology is considered to be the most effective way to utilize renewable low-temperature heat. Air source heat pumps have attracted widespread attention due to their high efficiency, energy saving, environmental protection and safety. However, the development of air source heat pump technology is now relatively mature, and the energy conservation and efficiency improvement of traditional air source heat pump hot water systems have encountered bottlenecks. There is an urgent need to explore technical paths to improve the quality and efficiency of air source heat pump hot water systems. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to break through the bottleneck of traditional air source heat pump water heating systems, effectively reduce the operating energy consumption of air source heat pump water heating systems, and significantly improve the performance of air source heat pump water heating systems.

[0004] To achieve the above objectives, the present invention provides a photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system, the system comprising a refrigerant system, a hot water system, and a production / power supply system;

[0005] The refrigerant system mainly consists of a compressor 1, a one-way valve 2, a hot water heat exchanger 3, a two-phase ejector 4, a gas-liquid separator 5, an electronic expansion valve 6, an intercooler 7, and a finned heat exchanger 8. The outlet of the compressor 1 is connected to the one-way valve 2, the hot water heat exchanger 3, the two-phase ejector 4, and the gas-liquid separator 5 in sequence. The outlet of the compressor 1 is separated 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 after merging with the outlet of the finned heat exchanger 8; 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 intercooler 7, and the other path is connected to the inlet of the compressor 1 through the intercooler 7, the finned heat exchanger 8, and the gas-liquid separator 5.

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

[0007] The types of hot water heat exchanger 3 and intercooler 7 include flat plate type, spiral plate type, plate fin type, immersed spiral tube type, shell and tube type;

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

[0009] The hot water system mainly consists of a hot water heat exchanger 3 and a water pump 9. The water pump 9 is connected to the water side of the hot water heat exchanger 3 via a water pipeline.

[0010] The power generation / supply system mainly consists of a photovoltaic array 10, a DC converter 11, and an AC / DC inverter 12. The power generation / supply system is divided into two routes: one route connects the photovoltaic array 10 to the DC converter 11, and the other route connects the municipal power grid to the AC / DC inverter 12. The above two routes are connected to the compressor 1, the fan of the finned heat exchanger 8, and the water pump 9 after being combined through the outlet of the DC converter 11 and the outlet of the AC / DC inverter 12.

[0011] The types of solar cell elements of the photovoltaic array 10 include monocrystalline silicon, polycrystalline silicon, copper indium gallium selenide, gallium arsenide, cadmium telluride, and perovskite;

[0012] The motors of the compressor 1 , the fan of the finned heat exchanger 8 , and the water pump 9 are all DC driven, and their types include brushless DC, brushed DC, and permanent magnet DC.

[0013] Beneficial effects of the present invention:

[0014] The present invention makes full use of renewable energy sources such as solar energy and air energy, thereby increasing the proportion of renewable energy applications in the system;

[0015] The present invention integrates the jet refrigeration technology with the air source heat pump technology, effectively reducing the throttling loss and superheating loss of the traditional steam compression cycle, and improving the compressor efficiency and system performance;

[0016] The present invention adopts an ejector with a low ejection rate to achieve supercooling of the circulating working medium at the inlet of the fin heat exchanger, thereby improving the liquid supply uniformity of the fin heat exchanger, increasing the enthalpy difference of the phase change working medium per unit mass, and thus improving the heat exchange performance of the fin heat exchanger.

[0017] The system of the present invention is self-sufficient in electrical energy, and the system is highly efficient, low-carbon and has low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system of the present invention;

[0019] Numbers in the figure: 1-compressor, 2-check valve, 3-hot water heat exchanger, 4-two-phase ejector, 5-gas-liquid separator, 6-electronic expansion valve, 7-intercooler, 8-finned heat exchanger, 9-water pump, 10-photovoltaic array, 11-DC converter, 12-AC / DC inverter. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1 As shown, in this embodiment, a photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system includes a refrigerant system and a hot water system.

[0022] The refrigerant system mainly consists of a compressor 1, a one-way valve 2, a hot water heat exchanger 3, a two-phase ejector 4, a gas-liquid separator 5, an electronic expansion valve 6, an intercooler 7, a finned heat exchanger 8 and a refrigerant pipeline;

[0023] The hot water system mainly consists of a hot water heat exchanger 3 and a water pump 9 connected via a water pipeline;

[0024] The power generation / supply system mainly comprises a photovoltaic array 10, a DC converter 11, and an AC / DC inverter 12 connected via a circuit.

[0025] This embodiment provides a photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system, which can achieve cogeneration of heat and power and self-sufficiency in electricity.

[0026] like Figure 1As shown, the compressor 1, electronic expansion valve 6, and water pump 9 are turned on, the finned heat exchanger 8 is the evaporator, and the hot 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 hot water heat exchanger 3 through the one-way valve 2, releases heat into the hot water system, and 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 turn it into a medium-pressure gas-liquid two-phase refrigerant, and then passes through the gas-liquid separator 5 to separate it into saturated gaseous refrigerant and saturated liquid refrigerant. The saturated gaseous refrigerant merges with the superheated gaseous refrigerant at the outlet of the finned heat exchanger 8 and returns to the compressor 1. The saturated liquid refrigerant is split 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, which then absorbs heat in the intercooler 7 and becomes superheated refrigerant, which is then ejected into the two-phase ejector 4. The other path is cooled to a subcooled refrigerant after passing through the intercooler 7. It then enters the finned heat exchanger to absorb solar energy and air energy, boiling into a superheated gaseous refrigerant. After that, it merges with the saturated gaseous refrigerant separated by the gas-liquid separator 5 and returns to the compressor 1. Driven by the water pump 9, hot water enters the hot water heat exchanger 3 to absorb heat, thus circulating and being continuously heated. Furthermore, the photovoltaic array 10 converts solar energy into DC power, which is then converted to DC power of a specific voltage by a DC converter 11 for use in the system. If the power generated by the photovoltaic array 10 exceeds the system's power consumption, the surplus power is connected to the grid via an AC / DC inverter 12. If the power generated by the photovoltaic array 10 is less than the system's power consumption, the grid is converted to DC power of a specific voltage by an AC / DC inverter 12 for use in the system.

[0027] 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 photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system, comprising a refrigerant system, a hot water system, and a production / power supply system; The refrigerant system is mainly composed of a compressor (1), a one-way valve (2), a hot water heat exchanger (3), a two-phase ejector (4), a gas-liquid separator (5), an electronic expansion valve (6), an intermediate cooler (7), and a finned heat exchanger (8). The outlet of the compressor (1) is connected to the one-way valve (2), the hot 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 is connected to the inlet of the compressor (1) after merging with the outlet of the finned heat exchanger (8); the other path is further 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 intermediate cooler (7), and the other path is connected to the inlet of the compressor (1) through the intermediate cooler (7), the finned heat exchanger (8), and the gas-liquid separator (5). The hot water system is mainly composed of a hot water heat exchanger (3) and a water pump (9), and the water pump (9) is connected to the water side of the hot water heat exchanger (3) via a water pipeline; The power generation / supply system is mainly composed of a photovoltaic array (10), a DC converter (11), and an AC / DC inverter (12). The power generation / supply system is divided into two routes, one route is connected to the photovoltaic array (10) and the DC converter (11), and the other route is connected to the municipal power grid and the AC / DC inverter (12). The above two routes are connected to the compressor (1), the fan of the finned heat exchanger (8), and the water pump (9) after being combined through the outlet of the DC converter (11) and the outlet of the AC / DC inverter (12).

2. The photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system according to claim 1 is characterized in that: The types of compressors (1) include rotor type, scroll type and piston type.

3. The photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system according to claim 1 is characterized in that: The types of the hot water heat exchanger (3) and the intermediate cooler (7) include flat plate type, spiral plate type, plate rib type, immersed spiral tube type, sleeve type, and shell and tube type.

4. The photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system according to claim 1 is characterized in that: The electronic expansion valve (6) can be replaced by a thermal expansion valve or a capillary tube.

5. The photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system according to claim 1 is characterized in that: The types of solar cell elements of the photovoltaic array (10) include single crystal silicon, polycrystalline silicon, copper indium gallium selenide, gallium arsenide, cadmium telluride, and perovskite.

6. The photovoltaic direct-driven air source injection-compression combined cycle heat pump cogeneration system according to claim 1 is characterized in that: The motors of the compressor (1), the fan of the finned heat exchanger (8), and the water pump (9) are DC-driven, and their types include brushless DC, brushed DC, and permanent magnet DC.

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