Photovoltaic direct-driven air source injection-compression composite cycle heat pump combined heat and power generation system

Abstract

The invention relates to a photovoltaic direct-drive air source injection-compression composite cycle heat pump combined heat and power generation system which comprises a refrigerant system, a hot water system and a power generation / supply system. The system is composed of a compressor, a one-way valve, a hot water heat exchanger, a two-phase ejector, a gas-liquid separator, an electronic expansion valve, an intercooler, a finned heat exchanger, a water pump, a photovoltaic array, a direct-current converter and an alternating-current and direct-current inverter. The system can achieve cogeneration. The jet refrigeration technology is introduced into the air source heat pump technology, so that throttling loss and overheating loss in the traditional steam compression type circulation process are reduced, and the system performance is improved; and meanwhile, the refrigerant at the inlet of the finned heat exchanger is supercooled by adopting a low-injection-rate method, so that the distribution uniformity of the refrigerant of the finned heat exchanger is guaranteed, and the heat exchange efficiency of the finned heat exchanger is improved. Renewable energy sources of solar energy and air energy are fully utilized, self-production and self-use of electric energy are achieved, and energy conservation, high efficiency, environment friendliness and low carbon are achieved.

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 compound 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 home or commercial facilities. In recent years, with the vigorous development of my country's energy conservation and carbon reduction, hot water preparation equipment has gradually been replaced by renewable energy equipment instead of coal-fired boilers and gas-fired boilers.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 saving, clean and pollution-free, and heat pump technology is considered to be the most effective way to utilize renewable low-temperature heat. Air source heat pumps have received widespread attention due to their high efficiency, energy saving, environmental protection and safety. However, the development of air source heat pump technology is relatively mature, and the energy saving and efficiency improvement of traditional air source heat pump hot water systems have encountered bottlenecks. It is urgent to explore the technical path to improve the quality and efficiency of air source heat pump hot water systems. Summary of the invention

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

[0004] To achieve the above-mentioned object, the present invention provides a photovoltaic direct-driven air source injection-compression compound 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 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 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, 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 is connected to the inlet of the compressor 1 after merging with the outlet of the finned heat exchanger 8; 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 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 exchangers 3 and intercoolers 7 include flat plate type, spiral plate type, plate fin type, immersed spiral tube type, sleeve type, and 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 is mainly composed 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 production / power supply system mainly consists of a photovoltaic array 10, a DC converter 11, and an AC / DC inverter 12. The production / power 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;

[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 driven by direct current, and the types thereof include brushless direct current, brushed direct current, and permanent magnet direct current.

[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, and increases the proportion of renewable energy application 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 overheating 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 unit mass phase change working medium, 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 compound 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 compound cycle heat pump cogeneration system includes a refrigerant system and a hot water system.

[0022] 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 intercooler 7, a finned heat exchanger 8 and a refrigerant pipeline;

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

[0024] The power generation / supply system mainly consists of 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 compound cycle heat pump cogeneration system, which can achieve cogeneration and self-sufficiency in electricity.

[0026] like Figure 1As shown, the compressor 1, the electronic expansion valve 6, and the water pump 9 are turned on, the finned heat exchanger 8 is an evaporator, and the hot water heat exchanger 3 is a 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 to release 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 become a medium-pressure gas-liquid two-phase refrigerant, and then is separated into a saturated gaseous refrigerant and a saturated liquid refrigerant by the gas-liquid separator 5. Refrigerant, among which, 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, and the saturated liquid refrigerant is divided into two paths: one path is throttled and depressurized by the electronic expansion valve 6 to become a gas-liquid two-phase refrigerant, and then absorbs heat through the intermediate cooler 7 to become a superheated refrigerant and enter the two-phase ejector 4 to be ejected; the other path is cooled to a supercooled refrigerant after passing through the intermediate cooler 7, enters the finned heat exchanger to absorb solar energy and air energy to boil into a superheated gaseous refrigerant, and then 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, the hot water enters the hot water heat exchanger 3 to absorb heat, and is continuously heated in this cycle. In addition, the photovoltaic array 10 converts solar energy into direct current electricity, and converts it into direct current of a specific voltage for the system through the direct current converter 11. If the power generated by the photovoltaic array 10 is greater than the power consumption of the system, the surplus power is connected to the grid through the AC-DC inverter 12; if the power generated by the photovoltaic array 10 is less than the power consumption of the system, the grid is converted into direct current of a specific voltage for the system through the AC-DC inverter 12.

[0027] Although 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 the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic direct-driven air source injection-compression compound cycle heat pump cogeneration system, the 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 divided 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 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 between the photovoltaic array (10) and the DC converter (11), and the other route is connected between the municipal power grid and the AC / DC inverter (12). The 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 intercooler (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) may 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 monocrystalline 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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