A system that realizes the trigeneration of cooling, heating and electricity, integrating PV / T and ground source heat pump
By designing a integrated system for cooling, heat and electricity supply PV/T and ground source heat pump, the use of solar photovoltaic panels and fan coils, the problem of heat accumulation in the summer of the ground source heat pump is solved, and the step utilization and transfer of heat is realized, improving the speed of heat System efficiency, reduce costs, and alleviate the heat island effect.
Patent Information
- Application Number
- CN201910424195.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-05-21
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2039-05-21
AI Technical Summary
When the ground source heat pump system is running in summer, heat accumulation is caused by the slow soil heat dissipation rate. Traditional solutions require adding cooling towers to assist in heat dissipation, increasing initial investment and operating costs, and dissipating heat into the atmospheric environment, which fails to alleviate the heat island effect.
Design a system that integrates PV/T and ground source heat pump with a three-unit supply of cold, heat and electricity. It uses fan coils to connect circulating evaporators, compressors, condensers, throttle valves and solar photovoltaic panels. Water tanks and underground pipes realize the step-by-step utilization and transfer of heat, providing cold, hot and electricity during the day, and radiating heat into outer space through solar photovoltaic panels at night.
It solves the problem of thermal accumulation of ground source heat pumps, realizes step-by-step utilization of energy, improves system operation efficiency, realizes the triple supply of cold, heat and electricity, and transfers heat from the soil to outer space to maintain a constant soil environment. Atmospheric friendly, avoiding the cost and expense of increasing the cooling tower.
Smart Images
Figure CN110057008B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of building energy conservation, solar energy, geothermal energy and other renewable energy utilization technologies, and specifically to a system that realizes trigeneration of cooling, heating and electricity and integrates PV / T and ground source heat pumps, which is used to solve the problem of heat accumulation in ground source heat pumps and realize the function of transferring heat from the earth to outer space. Background Art
[0002] Photovoltaic roof is one of the main ways of photovoltaic building integration at present. In order to improve the efficiency of photovoltaic power generation, the main method is to use a medium to cool the back of the battery. Water is the most commonly used medium due to its low viscosity, high specific heat, high density and easy access. During the day, in addition to outputting electrical energy, solar panels can also heat domestic water, achieving the dual functions of power generation and heating water. At night, in addition to convective heat exchange with the surrounding air, solar panels also exchange heat with radiation in outer space with a temperature of about 0K, so that the surface temperature of the solar panel drops to much lower than the ambient temperature.
[0003] The ground source heat pump system is environmentally friendly and can also store heat across seasons. It is an energy-saving technology that has been widely used in air conditioning industry projects in recent years. However, when the ground source heat pump system is running in summer, the slow heat dissipation rate of the soil causes the temperature of the soil around the buried pipe to rise, that is, heat accumulation. To solve this problem, the traditional approach is to add a cooling tower to assist in heat dissipation. As a result, the initial investment increases (cooling tower + ground source heat pump two sets of heat dissipation systems), the operating cost is not saved, and the heat is still dissipated into the atmosphere, without alleviating the heat island effect. Summary of the invention
[0004] The purpose of the present invention is to provide a system that integrates PV / T and ground source heat pump to achieve trigeneration of cooling, heating and electricity, in view of the heat accumulation phenomenon of ground source heat pump system that has not been solved in the prior art. The system can not only solve the heat accumulation of ground source heat pump, but also achieve trigeneration of cooling, heating and electricity at the same time, and realize the step-by-step utilization of energy to improve the system operation efficiency and reduce the initial investment.
[0005] The technical solution of the present invention is as follows:
[0006] A system integrating PV / T and ground source heat pump for realizing trigeneration of cooling, heating and electricity, comprising a chiller, underground pipes, solar photovoltaic panels, a water tank and a fan coil arranged indoors, wherein the chiller comprises an evaporator, a compressor, a condenser and a throttle valve connected in a circular manner in sequence, characterized in that: a first pipeline is led out from the water outlet of the evaporator and connected to a first water pump, and then connected to the water inlet of the fan coil, the water outlet of the fan coil is connected to the return water end of the evaporator through a second pipeline; a first pipeline is led out from the water outlet of the evaporator and connected to the first water pump, and then connected to the water inlet of the fan coil; the water outlet of the fan coil is connected to the return water end of the evaporator through a second pipeline; a second pipeline is led out from the condenser, and ... A third pipeline is led out from the water outlet of the condenser and connected to the first valve and the second water pump, and then connected to the water inlet of the buried pipe; a fourth pipeline is led out from the water outlet of the buried pipe and connected to the second and third valves in sequence, and then connected to the return water end of the condenser; a fifth pipeline is led out from the water outlet of the back copper pipe of the solar photovoltaic cell panel and connected to the fourth valve, and then connected to the water inlet of the water tank; a sixth pipeline is led out from the water outlet of the water tank and connected to the fifth and sixth valves in sequence, and then connected to the water inlet of the back copper pipe of the solar photovoltaic cell panel;
[0007] A seventh pipeline is led out from the water outlet end of the buried pipe and connected to the seventh valve and the third water pump, and then connected to the sixth pipeline between the fifth and sixth valves; an eighth pipeline is led out from the water outlet end of the copper tube on the back of the solar photovoltaic panel and connected to the eighth valve, and then connected to the fourth pipeline between the second and third valves; the power output end of the solar photovoltaic panel is connected to indoor electrical appliances through a power supply circuit, and the drainage end of the water tank is connected to a water supply pipeline leading to the room.
[0008] The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump is characterized in that a water supply port is provided on one side of the water tank and is connected to a water supply pipe.
[0009] The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump is characterized in that the first, second and third water pumps are all circulating pumps.
[0010] The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump is characterized in that the first, second, third, fourth, fifth, sixth, seventh and eighth valves are all flow regulating valves.
[0011] Beneficial effects of the present invention:
[0012] 1. The present invention solves the difficult problems and heat accumulation phenomenon in the operation of ground source heat pumps;
[0013] 2. The present invention realizes the step-by-step utilization of energy and improves the system operation efficiency;
[0014] 3. The present invention realizes the trigeneration of cooling, heating and electricity at the same time;
[0015] 4. The present invention realizes the transfer of excess heat in the soil to outer space, which can keep the soil environment constant and friendly to the atmospheric environment;
[0016] 5. The present invention does not need to add a cooling tower to assist in heat dissipation, thus saving construction and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION
[0018] See also Figure 1 A system integrating PV / T and ground source heat pump to realize trigeneration of cooling, heating and electricity includes a chiller 1, an underground pipe 2, a solar photovoltaic panel 3, a water tank 4 and a fan coil 6 arranged in a room 5. The chiller 1 includes an evaporator 1-1, a compressor 1-2, a condenser 1-3 and a throttle valve 1-4 which are connected in a circular manner in sequence. A first pipeline 7 is led out from the water outlet of the evaporator 1-1 and connected to a first circulation pump 8, and then connected to the water inlet of the fan coil 6. The water outlet of the fan coil 6 is connected to the return water end of the evaporator 1-1 through a second pipeline 9; a first pipeline 7 is led out from the water outlet of the condenser 1-3, and a first circulation pump 8 is .... The three pipelines 10 are connected to the first flow regulating valve 11 and the second circulating pump 12, and then connected to the water inlet end of the buried pipe 2. The fourth pipeline 13 is led out from the water outlet end of the buried pipe 2 and connected to the second and third flow regulating valves 14 and 15 in sequence, and then connected to the return water end of the condenser 1-3; the fifth pipeline 16 is led out from the water outlet end of the back copper pipe of the solar photovoltaic cell panel 3 and connected to the fourth flow regulating valve 17, and then connected to the water inlet of the water tank 4; the sixth pipeline 18 is led out from the water outlet of the water tank 4 and connected to the fifth and sixth flow regulating valves 19 and 20 in sequence, and then connected to the water inlet end of the back copper pipe of the solar photovoltaic cell panel 3;
[0019] A seventh pipeline 21 is led out from the water outlet end of the buried pipe 2 and connected to the seventh flow regulating valve 22 and the third circulation pump 26, and then connected to the sixth pipeline 18 between the fifth and sixth flow regulating valves 19 and 20; an eighth pipeline 23 is led out from the water outlet end of the copper tube on the back of the solar photovoltaic panel 3 and connected to the eighth flow regulating valve 24, and then connected to the fourth pipeline 13 between the second and third flow regulating valves 14 and 15; the power output end of the solar photovoltaic panel 3 is connected to the electrical appliances in the room 5 through a power supply circuit (including a battery); the drainage end of the water tank 4 is connected to a water supply pipeline 25 leading to the room 5; a water replenishment port is provided on one side of the water tank 4 and is connected to a water replenishment pipe.
[0020] The present invention will be further described below with reference to the accompanying drawings:
[0021] When the present invention is operated in summer, the operation modes during the day and at night are respectively:
[0022] 1. Daytime operation mode: the chiller 1 is started, and the chilled water generated by the evaporator 1-1 is transported to the fan coil 6 of the room 5 by the first circulation pump 8 through the first pipeline 7 to cool the room 5. The heated return water flows back to the evaporator 1-1 through the second pipeline 9 to realize the refrigeration cycle of the room 5; the condensation heat is transported to the buried pipe 2 by the second circulation pump 12 along with the water flow through the third pipeline 10, and then diffused to the soil through the buried pipe 2, and the return water flows back to the condenser 1-3 through the fourth pipeline 13. The specific process is: the water outlet end of the condenser 1-3-the first flow regulating valve 11-the second circulation pump 12-the buried pipe 2-the second flow regulating valve 14-the third flow regulating valve 15-the return water end of the condenser 1-3. During this period, the seventh flow regulating valve 22 is closed, thereby realizing the refrigeration function.
[0023] At the same time, the solar photovoltaic panel 3 converts a part of the solar energy into high-quality electrical energy and stores it in the battery, which supplies power to the indoor room 5; the heat energy released by the solar photovoltaic panel 3 is brought into the water tank 4 by the water in the copper tube on its back, and the hot water is transported to the water tank 4 from the copper tube on the back of the solar photovoltaic panel 3 via the fifth pipeline 16, and the cold water is transported from the water tank 4 to the copper tube on the back of the solar photovoltaic panel 3 via the sixth pipeline 18, and the water tank 4 provides domestic hot water to the indoor room 5 through the water supply pipeline 25. The specific process is: the water outlet of the water tank 4 - the fifth flow regulating valve 19 - the sixth flow regulating valve 20 - the copper tube on the back of the solar photovoltaic panel 3 - the fourth flow regulating valve 17 - the water inlet of the water tank 4. During this period, the eighth flow regulating valve 24 is closed, thereby realizing the functions of power generation, power supply, hot water production and hot water supply.
[0024] 2. Operation mode at night: the functions of cooling, power supply and hot water supply are the same as above; the condensation heat is transported to the buried pipe 2 by the second circulation pump 12 along with the water flowing through the third pipeline 10, and then transported to the back copper pipe of the solar photovoltaic panel 3 by the third circulation pump 26 through the seventh pipeline 21. Through the convection heat exchange between the solar photovoltaic panel 3 and the surrounding air and the radiation heat exchange with the outer space, the return water flows back to the condenser 1-3 through the eighth pipeline 23, so that the soil can be cooled well and the heat accumulation phenomenon is solved. The specific process is: the water outlet of the condenser 1-3-the first flow regulating valve 11-the second circulation pump 12-the buried pipe 2-the seventh flow regulating valve 22-the sixth flow regulating valve 20-the back copper pipe of the solar photovoltaic panel 3-the eighth flow regulating valve 24-the third flow regulating valve 15-the return water end of the condenser 1-3. During this period, the second, fourth and fifth flow regulating valves 14, 17 and 19 are all closed.
[0025] The above explains the operation modes during the day and at night, which confirms the feasibility of solving the problem of soil heat accumulation of ground source heat pumps through the technical solution of the present invention. The daytime operation mode also confirms that the system can achieve trigeneration of cooling, heating and electricity.
[0026] The present invention proposes a feasible solution to the heat accumulation phenomenon generated when the ground source heat pump system is running in summer, that is, the heat dissipated into the soil during the day is transferred to the surrounding air and outer space by radiation through solar photovoltaic panels at night, so that the soil temperature is better restored at night, ensuring the efficient operation of the chiller during the day. The system has important economic and social significance.
[0027] The above embodiments are merely descriptions of preferred implementation schemes of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the design spirit of the present invention, any modification and improvement made to the technical solution of the present invention by a person of ordinary skill in the art shall fall within the protection scope of the present invention.
Claims
1. A system integrating PV / T and ground source heat pump to realize trigeneration of cooling, heating and electricity, comprising a chiller, underground pipes, solar photovoltaic panels, a water tank and a fan coil arranged indoors, wherein the chiller comprises an evaporator, a compressor, a condenser and a throttle valve connected in a cycle in sequence, characterized in that: A first pipeline is led out from the water outlet of the evaporator and connected to the first water pump, and then connected to the water inlet of the fan coil unit; the water outlet of the fan coil unit is connected to the return water end of the evaporator through a second pipeline; a third pipeline is led out from the water outlet of the condenser and connected to the first valve and the second water pump, and then connected to the water inlet end of the buried pipe; a fourth pipeline is led out from the water outlet of the buried pipe and connected to the second and third valves in sequence, and then connected to the return water end of the condenser; a fifth pipeline is led out from the water outlet of the back copper pipe of the solar photovoltaic panel and connected to the fourth valve, and then connected to the water inlet of the water tank; a sixth pipeline is led out from the water outlet of the water tank and connected to the fifth and sixth valves in sequence, and then connected to the water inlet end of the back copper pipe of the solar photovoltaic panel; A seventh pipeline is led out from the water outlet end of the buried pipe and connected to the seventh valve and the third water pump, and then connected to the sixth pipeline between the fifth and sixth valves; an eighth pipeline is led out from the water outlet end of the copper pipe on the back of the solar photovoltaic panel and connected to the eighth valve, and then connected to the fourth pipeline between the second and third valves; the power output end of the solar photovoltaic panel is connected to the indoor electrical appliances through the power supply circuit, and the drainage end of the water tank is connected to the water supply pipeline leading to the indoor room; In summer operation, the day and night operation modes are as follows: Daytime operation mode: The chiller is started, and the chilled water generated by the evaporator is transported to the indoor fan coil unit through the first pipeline by the first circulation pump to cool the room, and the heated return water flows back to the evaporator through the second pipeline to realize the indoor refrigeration cycle; the condensation heat is transported to the buried pipe through the third pipeline by the second circulation pump along with the water flow, and then diffused to the soil through the buried pipe, and the return water flows back to the condenser through the fourth pipeline. During this period, the seventh flow regulating valve is closed, thereby realizing the refrigeration function; The solar photovoltaic panel stores part of the solar energy in the storage battery, and the storage battery supplies power to the room; the heat energy released by the solar photovoltaic panel is brought into the water tank by the water in the copper tube on the back of the solar photovoltaic panel, and the hot water is transported to the water tank through the fifth pipeline from the copper tube on the back of the solar photovoltaic panel, and the cold water is transported to the copper tube on the back of the solar photovoltaic panel through the sixth pipeline from the water tank, and the water tank provides domestic hot water to the room through the water supply pipeline. During this period, the eighth flow regulating valve is closed, thereby realizing the functions of power generation, power supply, hot water production and hot water supply; Operation mode at night: the functions of cooling, power supply and hot water supply are the same as above; the condensation heat is transported to the buried pipe by the second circulation pump along with the water flow through the third pipeline, and then transported to the back copper pipe of the solar photovoltaic panel (3) by the third circulation pump through the seventh pipeline. Through the convection heat exchange between the solar photovoltaic panel and the surrounding air and the radiation heat exchange with the outer space, the return water flows back to the condenser through the eighth pipeline, thereby having a good cooling effect on the soil and solving the problem of heat accumulation. During this period, the second, fourth and fifth flow control valves are all closed.
2. The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump according to claim 1 is characterized in that: A water supply port is provided on one side of the water tank and is connected with a water supply pipe.
3. The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump according to claim 1 is characterized in that: The first, second and third water pumps are all circulating pumps.
4. The system for realizing trigeneration of cooling, heating and electricity integrating PV / T and ground source heat pump according to claim 1 is characterized in that: The first, second, third, fourth, fifth, sixth, seventh and eighth valves are all flow regulating valves.