CN114754428A - Natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system - Google Patents

Natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system Download PDF

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CN114754428A
CN114754428A CN202210195198.8A CN202210195198A CN114754428A CN 114754428 A CN114754428 A CN 114754428A CN 202210195198 A CN202210195198 A CN 202210195198A CN 114754428 A CN114754428 A CN 114754428A
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heat
subsystem
water
natural gas
low
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刘扬
徐定华
杭晨哲
潘冠福
张海云
张仕杰
岳涵
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National Institute of Metrology
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National Institute of Metrology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0014Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using absorption or desorption
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0096Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00Solar heat collectors specially adapted for particular uses or environments
    • F24S20/40Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/20Optical components
    • H02S40/22Light-reflecting or light-concentrating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F24F2005/0067Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00Details or features not otherwise provided for
    • F24F2221/18Details or features not otherwise provided for combined with domestic apparatus
    • F24F2221/183Details or features not otherwise provided for combined with domestic apparatus combined with a hot-water boiler
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin

Abstract

The invention discloses a natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system which comprises a low-power light-gathering PV/T subsystem, a natural gas-assisted heater subsystem, a heat pump subsystem, a lithium bromide refrigeration subsystem, an indoor tail end system and a heat storage water tank. The low-power concentrating PV/T subsystem is used for providing electric energy and heat energy, and a heat energy output end of the low-power concentrating PV/T subsystem is connected with the heat storage water tank. The natural gas auxiliary heater subsystem and the heat pump subsystem are both connected with an inlet of the indoor tail end system, and an outlet of the indoor tail end system is connected with the concentrating photovoltaic photo-thermal subsystem; the heat pump subsystem is connected with the lithium bromide refrigeration subsystem. The invention adopts low-power light-gathering PV/T equipment, and a multifunctional complementary mode is an innovation, firstly, heat pump assistance is adopted, and when the temperature of a heat pump can not meet the heat supply or refrigeration requirement, a natural gas auxiliary heating mode is adopted for operation. The PV/T can provide heat source and electric energy, so the control strategy gives priority to the heat pump and natural gas as a secondary auxiliary heat source.

Description

Natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system
Technical Field
The invention relates to the technical field of concentrating photovoltaic photo-thermal, natural gas auxiliary heating equipment, heat pumps and lithium bromide refrigerators, in particular to a natural gas auxiliary low-power concentrating photovoltaic coupling photo-thermal-heat pump-lithium bromide refrigerator thermoelectric cold multi-energy complementary system.
Background
At present, under the global large background of energy conservation and emission reduction, renewable energy technologies represented by solar technologies are mature day by day, and the solar energy renewable energy resources have wide application and popularization prospects. The photovoltaic and photo-thermal technology can provide electric energy and heat energy to meet the cold/heat/electric load requirements under the condition of sufficient solar radiation. The concentrating photovoltaic photo-thermal technology adopts the compound parabolic concentrator on the basis of the photovoltaic photo-thermal technology, and under the action of the concentrator, the irradiation intensity of a photovoltaic cell in unit area can be further increased, so that the system cost is effectively reduced, the heat energy grade is improved, and the overall efficiency is greatly improved. The condensing lens with low condensing ratio is selected to produce heat matched with daily life needs of residents, so that the low condensing photovoltaic photo-thermal (PV/T) has great potential for energy supply in buildings such as houses, office buildings, hospitals and the like.
The solar energy has the characteristics of randomness and volatility, and the instability of the system can be caused by only using the solar energy as the energy input of the multi-energy complementary system, so that the reliability of the system is seriously reduced. It is therefore desirable to couple with a device that can provide energy replenishment, thereby improving the reliability of the system. The natural gas is used as the most main fossil fuel in the combined cooling/heating/power system, has the advantages of high heat value, convenient transportation and the like, and is applied to the distributed combined cooling/heating/power system which is complementary with solar energy. At present, with the maturity of heat pump technology, a more energy-saving and environment-friendly heating and refrigerating mode gradually replaces the traditional mode and is applied to thousands of households, the photovoltaic photo-thermal technology and the heat pump technology are coupled, the heat pump can be used for supplementing heat of the low-concentration-ratio PV/T, the vacancy of the residual heat of the low-concentration-ratio PV/T is filled under the condition of poorer irradiation conditions, and the energy level of the heat is improved at the same time. The absorption type lithium bromide refrigerator is used as a common refrigeration technology at present, the heat energy level of output is improved through the heat pump, so that the lithium bromide refrigerator is driven to stably operate, the energy gradient utilization is effectively realized, and the cold load of a user is fully met.
Therefore, the natural gas-assisted low-concentration photovoltaic photo-thermal technology is efficiently combined with the heat pump and lithium bromide refrigerator technology, and the comprehensive utilization efficiency of the multi-energy complementary system is effectively improved. After the low-concentration PV/T subsystem absorbs radiation, the photovoltaic cell therein generates electric energy which can be used for: satisfy user's electric demand, store to the battery, uses such as consumer in electric energy internet surfing and the actuating system, heat energy can be used for: the lithium bromide refrigerator can meet the heat load of users, provide heat energy for refrigeration of the lithium bromide refrigerator, supply domestic hot water and the like, has higher reliability, and can fully meet the requirements of the users.
Disclosure of Invention
The solar energy is used as the energy input of the system, the heat pump is used as a primary auxiliary heat source, the natural gas is used as a secondary auxiliary heat source, and equipment such as a lithium bromide refrigerator is added, so that the annual stable operation of the multi-energy complementary system is effectively met, the cascade utilization of energy can be realized, the comprehensive utilization efficiency of the multi-energy complementary system is fully improved, and the deep energy conservation and emission reduction are realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system mainly comprises a low-power light-gathering PV/T subsystem, a natural gas auxiliary heater subsystem, a heat pump subsystem, a lithium bromide refrigeration subsystem, an indoor tail end system, a data monitoring system, a circulating water pump and a heat storage water tank. The low-power concentrating PV/T subsystem is used for providing electric energy and heat energy, the electric energy is used for meeting the power consumption requirement of a user or in a system, redundant electric energy can be connected to the internet or stored in a storage battery, and the heat energy can meet the requirements of heat load of the user, hot water for production and life and a heat source for measuring a heat source by a heat pump source. In summer, the heat pump subsystem is used for providing a heat source for the lithium bromide refrigerator, and the lithium bromide refrigerator subsystem meets the cold load of a user. In both the refrigeration and heating modes, natural gas is used as a secondary auxiliary heat source.
Regarding the electrical circuit of the multi-energy complementary system: firstly, a low-concentration PV/T subsystem circuit is connected with a maximum power point tracking solar controller, the maximum power point tracking solar controller is respectively connected with a storage battery and an inverter, and finally, the inverter is connected with a user load side and a power grid. Regarding the thermal circuit of the multi-energy complementary system: and cooling water enters the low-power concentrating PV/T subsystem, and enters the water inlet end of the heat storage water tank after absorbing the heat of the battery plate, the water outlet end of the heat storage water tank is connected with the domestic hot water end of the user side, the other water outlet end of the heat storage water tank is connected with a water pump and an electric three-way valve, and hot water enters the electric three-way valve and then respectively flows to the water inlet end of the heat source side of the heat pump and the water inlet end of the other electric three-way valve. The water outlet end of the heat source side of the heat pump is connected with an electric three-way valve, and hot water enters the electric three-way valve after heat exchange in the heat pump and flows to the water inlet end of the heat storage water tank together with the hydration flow at the water outlet end of the indoor tail end system; the water outlet end of the heat storage water tank is connected with a water pump and a flowmeter and is communicated with the water inlet end of the concentrating photovoltaic photo-thermal component.
For the circuit on the load side of the heat pump: the water outlet end of the load side of the heat pump is connected with the water inlet end of a heat storage water tank with an auxiliary heater, and the heat storage water tank can perform auxiliary heating on hot water according to requirements. The water outlet end of the heat storage water tank containing the auxiliary heater is connected with a water pump and an electric three-way valve, when heating is carried out in winter, hot water flows to the water inlet end of the other electric three-way valve from the water outlet end of the electric three-way valve, is converged with produced hot water of the low-power concentrating PV/T subsystem and flows into the water inlet end of the indoor tail end system; in summer, hot water flows to a heat source side water inlet end of the lithium bromide refrigerator from an electric three-way valve behind a heat storage water tank containing the auxiliary heater, and flows to a heat pump load side water inlet end after heat exchange.
The lithium bromide refrigeration subsystem comprises a lithium bromide refrigerator and a cooling tower. The water outlet end of the load side of the lithium bromide refrigerator is connected with the indoor tail end system, and cold water of the lithium bromide refrigerator enters the indoor tail end system for heat exchange and then flows into the water inlet end of the load side of the lithium bromide refrigerator; the water outlet end of the cooling side of the lithium bromide refrigerator is communicated with the water inlet end of the cooling tower, and the water outlet end of the cooling tower contains a water pump which is communicated with the water inlet end of the cooling side of the lithium bromide refrigerator.
The indoor end system is a capillary network system, two groups of capillary networks in the drawing are respectively the capillary network systems under the working conditions of summer and winter, and the capillary network systems under different working conditions are respectively drawn for the sake of clear representation in the drawing.
The heat pump subsystem is a water source heat pump subsystem.
The low-power concentrating PV/T subsystem comprises a collecting lens, a photovoltaic photo-thermal assembly, a maximum power point tracking controller, an inverter and a storage battery.
Compared with the prior art, the natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system provided by the invention can effectively realize energy gradient utilization, reduce the energy consumption of the system and improve the comprehensive utilization efficiency of the multi-energy complementary system. The condensing lens used by the low-power condensing PV/T subsystem can improve the irradiation amount of the cell in unit area, greatly reduce the technical cost and effectively improve the grade of the produced heat energy. The heat pump can ensure that the multi-energy complementary system is stable and effectively meets the heat requirement, and can be used as the heat source of the lithium bromide refrigerator, so that the lithium bromide refrigerator subsystem operates stably and efficiently, and cooling in summer is effectively realized. When the heat pump can not efficiently provide a heat source, a natural gas auxiliary heating mode is adopted to provide a stable heat source for a heating mode and a cooling mode. The invention establishes a multi-energy complementary system suitable for residential houses by a new system design, and the system takes solar energy as energy input and follows the energy gradient utilization, thereby ensuring the annual high-efficiency, energy-saving and stable operation of the system.
Drawings
FIG. 1 is a schematic diagram of a natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system.
The reference numbers in the figures are as follows: 1-low concentration PV/T subsystem; 2-maximum power point tracking controller; 3-a storage battery; 4-an inverter; 5-the power grid; 6-a flow meter; 7-a circulating water pump; 8-electrical load; 9-a heat storage water tank; 10-the user living hot water end; 11-an electric three-way valve; 12-a heat pump; 13-a heat storage water tank containing an auxiliary heater; 14-lithium bromide refrigerator; 15-a cooling tower; 16-indoor end systems; 17-stop valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
A natural gas auxiliary solar photovoltaic photo-thermal multi-energy complementary system takes low-concentration PV/T as a main heat source, and a heat pump subsystem and a natural gas auxiliary heater subsystem as auxiliary heat sources to meet the requirements of cold, heat and electricity; the system comprises a low-concentration PV/T subsystem, a natural gas auxiliary heater subsystem, a heat pump subsystem, a lithium bromide refrigeration subsystem, an indoor end system 16 and a heat storage water tank 9. The low-power concentrating PV/T subsystem is used for providing electric energy and heat energy, the heat energy output end of the low-power concentrating PV/T subsystem is connected with the heat storage water tank 9, and the heat storage water tank 9 is connected with the user living hot water end 10; the electric energy generated by the low-power concentrating PV/T subsystem is used for meeting the electricity utilization requirement in a user side load or a natural gas auxiliary solar photovoltaic photo-thermal multi-energy complementary system; the heat energy generated by the low-power concentrating PV/T subsystem can meet the requirements of heat load at the user side, hot water for production and living, a heat source at the heat pump source side and a driving heat source of a lithium bromide refrigerator. The natural gas auxiliary heater subsystem and the heat pump subsystem are both connected with an inlet of the indoor tail end system 16, and an outlet of the indoor tail end system 16 is connected with the concentrating photovoltaic photo-thermal subsystem; the heat pump subsystem is connected with the lithium bromide refrigeration subsystem. The low-power concentrating PV/T is a main heat source; the heat pump subsystem and the natural gas auxiliary heater subsystem are auxiliary heat sources, and when the heat source of the heat pump subsystem is insufficient, the natural gas auxiliary heater subsystem supplies heat.
The operation control of the natural gas auxiliary concentrating photovoltaic photo-thermal multi-energy complementary system is realized according to two main parameters, wherein the first parameter is the temperature of an experimental room, and the second parameter is the temperature of a loop heat storage water tank 9 of a low-concentration PV/T system. The laboratory temperature is the most basic parameter for controlling the start and stop of the equipment. In order to meet the requirements of all working conditions of an experimental room on comfort and also achieve the purpose of energy conservation, room temperature parameters are set according to a heating ventilation air-conditioning design manual. The room temperature is maintained at 20 ℃ in winter and fluctuates by 1 ℃ from top to bottom, and the room temperature is maintained at 25 ℃ in summer and fluctuates by 1 ℃ from top to bottom. When the room temperature is lower than 20 ℃, the heating mode is started, and when the room temperature is higher than 25 ℃, the cooling mode is started. The second parameter, the temperature of the hot water storage tank 9. This temperature is an index for determining which auxiliary heat source device is activated.
Under the heating mode, three control strategies of a natural gas auxiliary low-concentration PV/T multi-energy complementary system are expressed as follows:
the control strategy one is as follows: when the temperature of the heat storage water tank 9 is more than or equal to 40 ℃, the direct supply mode of the low-concentration PV/T system is adopted. The direct supply mode of the low-power concentrating PV/T system is that the low-power concentrating PV/T system is directly used as a heat source for heating an experimental room, and the temperature of the experimental room is kept stable.
And (2) control strategy two: when the temperature of the heat storage water tank 9 is lower than 40 ℃ but higher than 15 ℃, the temperature of the water source provided by the low-concentration PV/T system cannot meet the requirement of the heat load of a room, and auxiliary heating equipment is needed. For the above reasons. The outlet water of the low-power concentrating PV/T system is used as heat source water of the low-temperature water source heat pump, and the coupling mode not only can improve the comprehensive utilization efficiency of the low-power concentrating PV/T system, but also can improve the COP value of the water source heat pump unit.
And (3) control strategy three: when the temperature of the heat storage water tank 9 is lower than 15 ℃ in continuous rainy days or at night, natural gas is selected as an auxiliary heat source in consideration of factors such as cost and energy efficiency. In the operation mode, the low-power concentrating PV/T system and the low-temperature water source heat pump are not used as heat sources for heating rooms, and only natural gas is used as the only heat source for heating rooms.
Under the refrigeration mode, the natural gas auxiliary low-power light-gathering PV/T multi-energy complementary system has two control strategies.
The control strategy one is as follows: when the temperature of the heat storage water tank 9 is more than or equal to 40 ℃, hot water in the heat storage water tank 9 is used as a heat source of a high-temperature water source heat pump (HHP), the high-temperature water source heat pump provides a heat source of about 90 ℃ for the single-effect absorption type lithium bromide refrigerator, and the single-effect absorption type lithium bromide refrigerator is driven to meet the refrigeration requirement of a room.
And (2) control strategy two: when the temperature of the heat storage water tank 9 is lower than 40 ℃, a high-temperature water source heat pump is not started, and a natural gas auxiliary heater is directly used as a heat source of the absorption type lithium bromide refrigerating unit.
The heat generated by the low-concentration PV/T system is used for preheating domestic hot water. The low-power concentrating PV/T system is used as a heat source for preheating domestic hot water when the multi-energy complementary system does not need to provide heating heat and heat for driving refrigeration for a room and the PV/T system meets basic operation conditions.
Further, the lithium bromide refrigeration subsystem includes a lithium bromide refrigerator 14 and a cooling tower 15. The water outlet end of the load side of the lithium bromide refrigerator 14 is connected with the indoor end system 16, and cold water of the lithium bromide refrigerator 14 flows into the water inlet end of the load side of the lithium bromide refrigerator after entering the indoor end system 16 for heat exchange; the water outlet end of the cooling side of the lithium bromide refrigerator is communicated with the water inlet end of the cooling tower, and the water outlet end of the cooling tower 15 contains a water pump 7 which is communicated with the water inlet end of the cooling side of the lithium bromide refrigerator. In summer, the heat pump subsystem is used for providing a heat source for the lithium bromide refrigerator 14, and the lithium bromide refrigerator subsystem meets the cold load of a user.
Further, the redundant electric energy of the concentrating photovoltaic photo-thermal subsystem can be used for being connected to the internet or being stored in the storage battery 3.
Furthermore, in the heat loop of the multi-energy complementary system, cooling water after heat release from the user side in a circulating mode enters the low-power concentrating PV/T subsystem, and enters the water inlet end of the heat storage water tank 9 after absorbing the heat of the battery panel, the water outlet end of the heat storage water tank 9 is connected with the domestic hot water end of the user side, the other water outlet end is connected with the water pump 7 and the electric three-way valve 11, and hot water flows to the water inlet end of the heat source side of the heat pump and the water inlet end of the other electric three-way valve 11 after entering the electric three-way valve 11. The water outlet end of the heat source side of the heat pump is connected with an electric three-way valve 11, and hot water enters the electric three-way valve 11 after heat exchange in the heat pump 12 and flows to the water inlet end of the heat storage water tank 9 together with the hydration flow at the water outlet end of the indoor tail end system 16; the water outlet end of the heat storage water tank 9 is connected with a water pump 7 and a flowmeter 6 and is communicated with the water inlet end of the concentrating photovoltaic photo-thermal component 1.
Furthermore, in the loop of the heat pump load side, the water outlet end of the heat pump load side is connected with the water inlet end of the hot water storage tank 13 containing an auxiliary heater, and the hot water storage tank 9 can perform auxiliary heating on hot water according to requirements. The water outlet end of a hot water storage tank 13 containing an auxiliary heater is connected with a water pump 7 and an electric three-way valve 11, and hot water flows from the water outlet end of the electric three-way valve 11 to the water inlet end of the other electric three-way valve 11 during heating in winter, is combined with produced hot water of a concentrating photovoltaic photo-thermal subsystem and flows into the water inlet end of an indoor tail end system 16; in summer, hot water flows from the electric three-way valve 11 behind the hot water storage tank 13 with the auxiliary heater to the heat source side water inlet end of the lithium bromide refrigerator 14, and flows to the heat pump load side water inlet end after heat exchange.
The indoor end system 16 is a capillary network system, two groups of capillary networks in the figure are respectively the capillary network systems under the working conditions of summer and winter, and the capillary network systems under different working conditions are respectively drawn for the sake of clear representation in the figure.
The heat pump subsystem is a water source heat pump subsystem.
The invention is characterized in that the invention adopts low-power light-gathering PV/T equipment, a multi-energy complementary mode is an innovation, firstly, heat pump assistance is adopted, and when the temperature of a heat pump can not meet the heating or refrigerating requirement, a natural gas-assisted heating model is adopted for operation. The PV/T can provide heat source and electric energy, so the control strategy gives priority to the heat pump and natural gas as a secondary auxiliary heat source. The system is designed aiming at the low-concentration PV/T technology and matching the operation mode of the low-concentration PV/T technology.

Claims (10)

1. A natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system is characterized in that: the system comprises a low-power concentrating PV/T subsystem, a natural gas auxiliary heater subsystem, a heat pump subsystem, a lithium bromide refrigeration subsystem, an indoor end system (16) and a heat storage water tank (9); the low-power concentrating PV/T subsystem is used for providing electric energy and heat energy, the heat energy output end of the low-power concentrating PV/T subsystem is connected with the heat storage water tank (9), and the heat storage water tank (9) is connected with a user living hot water end (10); the electric energy generated by the low-power concentrating PV/T subsystem is used for meeting the electricity utilization requirement in a user side load or a natural gas auxiliary solar photovoltaic photo-thermal multi-energy complementary system; the heat energy generated by the low-power concentrating PV/T subsystem can meet the requirements of heat load at a user side, hot water for production and living, a heat source at a heat pump source side and a driving heat source of a lithium bromide refrigerator; the natural gas auxiliary heater subsystem and the heat pump subsystem are both connected with an inlet of the indoor tail end system (16), and an outlet of the indoor tail end system (16) is connected with the concentrating photovoltaic photo-thermal subsystem; the heat pump subsystem is connected with the lithium bromide refrigeration subsystem; the low-power concentrating PV/T is a main heat source; the heat pump subsystem and the natural gas auxiliary heater subsystem are auxiliary heat sources, and when the heat source of the heat pump subsystem is insufficient, the natural gas auxiliary heater subsystem supplies heat.
2. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: the operation control of the natural gas auxiliary concentrating photovoltaic photo-thermal multi-energy complementary system is realized according to two main parameters, wherein the first parameter is the temperature of an experimental room, and the second parameter is the temperature of a loop heat storage water tank (9) of a low-power concentrating PV/T subsystem; the temperature of the experimental room is the most basic parameter for controlling the start and stop of the equipment; the room temperature is maintained at 20 ℃ in winter, fluctuates at 1 ℃ from top to bottom, and the room temperature is maintained at 25 ℃ in summer and fluctuates at 1 ℃ from top to bottom; when the room temperature is lower than 20 ℃, starting a heating mode, and when the room temperature is higher than 25 ℃, starting a refrigerating mode; a second parameter, the temperature of the hot water storage tank (9); this temperature is an index for determining which auxiliary heat source device is activated.
3. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 2, characterized in that: under the heating mode, three control strategies of a natural gas auxiliary low-concentration PV/T multi-energy complementary system are expressed as follows:
the control strategy one is as follows: when the temperature of the heat storage water tank (9) is more than or equal to 40 ℃, the direct supply mode of the low-concentration PV/T system is adopted; the direct supply mode of the low-power concentrating PV/T system is that the low-power concentrating PV/T system is directly used as a heat source for heating an experimental room to maintain the temperature stability of the experimental room;
and (2) control strategy two: when the temperature of the heat storage water tank (9) is lower than 40 ℃ but higher than 15 ℃, the temperature of the water source provided by the low-power concentrating PV/T system cannot meet the requirement of the heat load of a room, and auxiliary heating equipment is needed; the outlet water of the low-power concentrating PV/T system is used as heat source water of the low-temperature water source heat pump, the coupling mode improves the comprehensive utilization efficiency of the low-power concentrating PV/T system, and simultaneously improves the COP value of the water source heat pump unit;
and (3) control strategy III: when the temperature of the heat storage water tank (9) is lower than 15 ℃ in continuous rainy days or at night, natural gas is selected as an auxiliary heat source; the low-power concentrating PV/T subsystem and the low-temperature water source heat pump are not used as heat sources for heating rooms, and natural gas is used as the only heat source for heating the rooms.
4. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system of claim 2, wherein: under a refrigeration mode, a natural gas auxiliary low-concentration PV/T multi-energy complementary system has two control strategies;
the control strategy one is as follows: when the temperature of the heat storage water tank (9) is more than or equal to 40 ℃, hot water in the heat storage water tank (9) is used as a heat source of a high-temperature water source heat pump, the high-temperature water source heat pump provides a heat source of about 90 ℃ for the single-effect absorption type lithium bromide refrigerator, and the single-effect absorption type lithium bromide refrigerator is driven to meet the refrigeration requirement of a room;
and (2) control strategy two: when the temperature of the heat storage water tank (9) is lower than 40 ℃, a high-temperature water source heat pump is not started, and a natural gas auxiliary heater is directly used as a heat source of the absorption type lithium bromide refrigerating unit;
the heat produced by the low-power concentrating PV/T system is used for preheating domestic hot water; the low-power concentrating PV/T subsystem is used as a heat source for preheating domestic hot water when the multi-energy complementary system does not need to provide heating heat and heat for driving refrigeration for a room and meets basic operation conditions.
5. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: the lithium bromide refrigeration subsystem comprises a lithium bromide refrigerator (14) and a cooling tower (15); the water outlet end of the load side of the lithium bromide refrigerator (14) is connected with the indoor end system (16), and cold water of the lithium bromide refrigerator (14) flows into the water inlet end of the load side of the lithium bromide refrigerator after entering the indoor end system (16) for heat exchange; the water outlet end of the cooling side of the lithium bromide refrigerator is communicated with the water inlet end of the cooling tower, and the water outlet end of the cooling tower (15) contains a water pump (7) which is communicated with the water inlet end of the cooling side of the lithium bromide refrigerator; in summer, the heat pump subsystem is used for providing a heat source for the lithium bromide refrigerator (14), and the lithium bromide refrigerator subsystem meets the cold load of a user.
6. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: the redundant electric energy of the concentrating photovoltaic photo-thermal subsystem can be used for surfing the Internet or stored in a storage battery (3).
7. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: in a heat loop of the multi-energy complementary system, cooling water after heat release is circulated from a user side enters a low-power light-gathering PV/T subsystem, and enters a water inlet end of a heat storage water tank (9) after heat of a battery plate is absorbed, a water outlet end of the heat storage water tank (9) is connected with a live hot water end of the user side, the other water outlet end is connected with a water pump (7) and an electric three-way valve (11), and hot water enters the electric three-way valve (11) and then respectively flows to a water inlet end on the heat pump heat source side and a water inlet end of the other electric three-way valve (11); the water outlet end of the heat source side of the heat pump is connected with an electric three-way valve (11), and hot water enters the electric three-way valve (11) after heat exchange in the heat pump (12) is finished, then is converged with water at the water outlet end of the indoor tail end system (16), and flows to the water inlet end of the heat storage water tank (9); the water outlet end of the heat storage water tank (9) is connected with a water pump (7) and a flowmeter (6) and is communicated with the water inlet end of the concentrating photovoltaic photo-thermal component (1).
8. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: the water outlet end of the load side of the heat pump subsystem is connected with the water inlet end of a heat storage water tank (13) with an auxiliary heater, and the heat storage water tank (9) is used for auxiliary heating of hot water according to the requirement; the water outlet end of a heat storage water tank (13) containing an auxiliary heater is connected with a water pump (7) and an electric three-way valve (11), when heating is carried out in winter, hot water flows from the water outlet end of the electric three-way valve (11) to the water inlet end of the other electric three-way valve (11), and is converged with produced hot water of the concentrating photovoltaic photo-thermal subsystem and flows into the water inlet end of an indoor tail end system (16); in summer, hot water flows to a heat source side water inlet end of a lithium bromide refrigerator (14) from an electric three-way valve (11) behind a heat storage water tank (13) with an auxiliary heater, and flows to a load side water inlet end of a heat pump subsystem after heat exchange.
9. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system of claim 1, wherein: the indoor end system (16) is a capillary network system.
10. The natural gas assisted solar photovoltaic photo-thermal multi-energy complementary system according to claim 1, characterized in that: the heat pump subsystem is a water source heat pump subsystem.
CN202210195198.8A 2022-03-01 2022-03-01 Natural gas-assisted solar photovoltaic photo-thermal multi-energy complementary system Pending CN114754428A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117232033A (en) * 2023-11-10 2023-12-15 中国电建集团西北勘测设计研究院有限公司 Room temperature regulating system for comprehensive utilization of photovoltaic light and heat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117232033A (en) * 2023-11-10 2023-12-15 中国电建集团西北勘测设计研究院有限公司 Room temperature regulating system for comprehensive utilization of photovoltaic light and heat

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