Combined cooling heating and power system of PV / T coupling sewage source heat pump

Abstract

A combined cooling heating and power system of a PV / T coupling sewage source heat pump comprises a PV / T assembly and a sewage source heat pump system. The PV / T assembly is sequentially connected with the heat collection water tank, the stop valve and the heat collection circulating pump to form a circulating heating system; the PV / T assembly is connected with an energy storage battery and a user side power supply in sequence to form a power supply system; the PV / T assembly is connected with the electricity selling internet to form an electricity selling system; an outlet of the heat collection water tank is connected with user-side domestic hot water through a pipeline; the sewage source heat pump system is composed of a sewage source heat pump, a user side water pump, sewage secondary water and a user side cooling / heating device. And the sewage secondary water is sequentially connected with the sewage side water pump and the sewage source heat pump to form a sewage side circulating system. The sewage source heat pump unit can supply power, cold / heat and domestic hot water to a user side, on one hand, the efficiency of the sewage source heat pump unit can be improved, and on the other hand, comprehensive utilization of energy can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solar photovoltaic light heat technology and heat pump technical field, especially relates to a cold heat electricity triple combination system of PV / T coupling sewage source heat pump. BACKGROUND

[0002] City sewage is a kind of clean, low-temperature energy, and is one of renewable energies that is less developed at present. The city sewage source heat pump system has good reliable cold and heat effect, and the cold (heat) coefficient is as high as 3.5-4.4, is an economic, efficient, energy-saving heat pump system. The city sewage temperature is constant, and the annual variation range is not large, and it is kept in a certain range all the year round. The sewage secondary effluent temperature is generally 12-14 DEG C in winter, about 10 DEG C higher than air temperature, and generally 27-28 DEG C in summer, about 10 DEG C lower than air temperature, so the city sewage is very excellent as the cold and heat source of the heat pump system. Using the heat energy in city sewage for refrigeration and heating, and recycling and utilizing city waste heat as new energy can greatly improve the energy utilization efficiency of city, simultaneously reduce the use of coal and other mineral resources, reduce air pollution, and have important significance for building energy-saving city.

[0003] Solar energy gradually becomes an important substitute for fossil fuels due to its wide distribution, easy access, large energy storage, cleanliness and no pollution. The comprehensive utilization of solar energy is one of effective ways to solve energy and environmental pollution problems. The PV / T assembly can concentrate photovoltaic and collector together to generate power generation and heat collection effect, the PV / T (solar photovoltaic / heat) assembly and sewage source heat pump are coupled, the heat generated by PV / T can be used for sewage source heat pump to supplement heat, improve unit energy efficiency, and energy maximum utilization can be realized.

[0004] To sum up, the technical problem to be solved by the utility model is that in the prior art, the heat supply system often depends on a single heat source, such as solar energy or geothermal energy, when these heat sources are unstable or insufficient, the heat supply of the system will also be affected. SUMMARY

[0005] The technical problem to be solved by the utility model is to provide a cold heat electricity triple combination system of PV / T coupling sewage source heat pump, which can supply power, cold / heat and domestic hot water for user side, on the one hand, the sewage source heat pump unit efficiency can be improved, on the other hand, energy comprehensive utilization can be realized.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0007] A cold heat electricity triple combination system of PV / T coupling sewage source heat pump, comprising a PV / T assembly and a sewage source heat pump system, the PV / T assembly is sequentially connected with a heat collection water tank, a stop valve and a heat collection circulating pump to form a circulating heating system,

[0008] The PV / T assembly is connected with the energy storage battery and the user side power supply in sequence to form a power supply system.

[0009] The PV / T assembly is connected with the electricity selling and grid connection to form an electricity selling system.

[0010] The outlet of the heat collecting water tank is connected with the user side domestic hot water through a pipeline.

[0011] The sewage source heat pump system is composed of a sewage source heat pump, a user side water pump, sewage secondary water and user side cooling / heat supply; the sewage secondary water is connected with the sewage water pump and the sewage source heat pump in sequence to form a sewage side circulation system.

[0012] When the temperature difference between the inlet and the outlet of the PV / T assembly is higher than 5℃, the heat collecting circulation pump is started; when the water temperature at the inlet and the outlet is lower than 2℃, the heat collecting circulation pump is stopped.

[0013] Preferably, the sewage source heat pump is connected with the user side water pump, the user side cooling / heat supply and the fourth stop valve in sequence to form a user side circulation system.

[0014] Preferably, the outlet of the heat collecting water tank is connected with the user side domestic hot water and the heat supplement circulation pump through a pipeline; the heat supplement circulation pump is used for supplying heat to the sewage secondary water and the sewage source heat pump.

[0015] Preferably, a third stop valve is arranged on the pipeline between the heat collecting water tank and the user side domestic hot water; a second stop valve is arranged on the pipeline between the heat supplement circulation pump and the sewage source heat pump.

[0016] A temperature sensor is arranged in the heat collecting water tank; the temperature difference control module is connected with the heat collecting circulation pump and the temperature sensor of the heat collecting water tank; the temperature difference control module controls the start and stop of the PV / T assembly and the heat collecting circulation pump according to the water temperature and system setting; the heat collecting water tank is provided with an automatic exhaust valve and a water tank pressure relief valve; the automatic exhaust valve is arranged at the top of the heat collecting water tank.

[0017] Preferably, the sewage source heat pump is composed of a sewage source heat pump compressor, a sewage source heat pump evaporator, a sewage source heat pump condenser and a sewage source heat pump throttling valve; the sewage source heat pump compressor is connected with the sewage source heat pump evaporator, the sewage source heat pump condenser and the sewage source heat pump throttling valve to form a refrigerant circulation.

[0018] When the sewage source heat pump system is running, the second stop valve is opened, the sewage is exchanged heat with the sewage source heat pump evaporator, the fourth stop valve is opened, the user side cooling / heat supply is exchanged heat with the sewage source heat pump condenser to supply cooling or heat for the user.

[0019] The sewage source heat pump comprises an evaporator, a condenser, a compressor, a throttling valve and a four-way reversing valve. The user carries out cooling and heating, the four-way reversing valve in the sewage source heat pump switches the flow direction of refrigerant, and heat exchange is carried out through the evaporator and the condenser to realize the switching of cooling and heating. The sewage source heat pump side carries out heat supplement. When the sewage quantity is insufficient or the sewage inlet temperature is low, the PV / T system heat collection tank can be used for heat supplement.

[0020] Preferably, the circulating heating system is controlled by the temperature difference control module.

[0021] Preferably, the sewage secondary water is the sewage treated by physics and chemistry from a sewage treatment plant.

[0022] The user side is a sewage treatment plant or surrounding residential or office buildings, but is not limited to the three types of buildings. The sewage treatment plant can take water locally, utilize the secondary water treated by physics and chemistry of the sewage treatment plant for heat exchange, and the PV / T assembly can be installed in the plant area, which can be used as a combined cooling, heating and power supply system for the sewage treatment plant, and has good economic benefits. The surrounding residents can also be provided with cold / heat and domestic hot water through the water supply pipeline.

[0023] The utility model can achieve the following beneficial effects:

[0024] 1. The PV / T system coupled with the sewage source heat pump system can provide cold, heat and electricity for the user side compared with the traditional sewage source heat pump, which is a comprehensive energy system, and the resource comprehensive utilization and energy utilization efficiency are improved. To a certain extent, carbon emissions can be significantly reduced, greenhouse gas emissions can be reduced, and the global climate warming can be positively affected.

[0025] 2. The PV / T system coupled with the sewage source heat pump system can enhance the stability of the system compared with the traditional sewage source heat pump. When the sewage source heat pump system supply is interrupted due to failure or the sewage temperature is insufficient, the PV / T system can utilize heat to supplement in time, effectively avoid many problems easily produced by the single sewage source heat pump system, and enhance the stability of the energy system.

[0026] 3. The start and stop of the PV / T assembly and the water pump are controlled by the temperature difference control module, which can realize the maximum utilization of energy and the humanization setting of the system. Hot water is automatically prepared at regular time during the period of sufficient sunlight in a day, which is energy-saving and high in heat efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described below in combination with the drawings and examples:

[0028] Figure 1 The utility model is a system structure diagram.

[0029] PV / T assembly 1; grid-connected electricity sales 2; energy storage battery 3; user-side power supply 4; hot water collecting tank 5; stop valve 6; heat collecting circulating pump 7; heat supplement circulating pump 8; first stop valve 9; second stop valve 10; third stop valve 11; sewage secondary water 12; sewage water measuring pump 13; sewage source heat pump 14; sewage source heat pump compressor 15; sewage source heat pump evaporator 16; sewage source heat pump condenser 17; sewage source heat pump throttling valve 18; user-side water pump 19; user-side cooling / heating 20; user-side domestic hot water 21; temperature control module 22; fourth stop valve 23. DETAILED DESCRIPTION

[0030] As shown in the preferred scheme, a PV / T coupled sewage source heat pump combined cooling, heating and power system comprises the following structures: Figure 1

[0031] The PV / T assembly 1, the hot water collecting tank 5, the stop valve 6 and the heat collecting circulating pump 7 are sequentially connected to form a circulating heating system; the system heats the tap water in the hot water collecting tank 5. The operation process of the circulating heating system is as follows: the circulating water enters the PV / T assembly 1 after being heated by the heat collecting circulating pump 7 in the system, and then enters the hot water collecting tank 5. The water in the hot water collecting tank 5 can provide hot water, and the hot water collecting tank 5 is connected with a tap water pipe. When the water level in the hot water collecting tank 5 is insufficient, tap water is used for water replenishment.

[0032] The circulating heating system further comprises a circulating start-stop control, which is controlled by the temperature difference control module 22. When the temperature difference between the inlet and outlet of the PV / T assembly 1 is higher than 5 ℃, the heat collecting circulating pump 7 is started; when the water temperature at the inlet and outlet is lower than 2 ℃, the heat collecting circulating pump 7 is stopped. The hot water collecting tank 5 is provided with a temperature sensor; the temperature difference control module 22 is connected with the heat collecting circulating pump 7 and the temperature sensor of the hot water collecting tank 5. The temperature difference control module 22 controls the start-stop of the PV / T assembly 1 and the heat collecting circulating pump 7 according to the water temperature and system setting.

[0033] The PV / T assembly 1, the energy storage battery 3 and the user-side power supply 4 are sequentially connected to form a power supply system; the PV / T assembly 1 and the grid-connected electricity sales 2 are sequentially connected to form an electricity sales system. The PV / T assembly 1 can generate electricity while producing heat, and the electricity generated by the PV / T assembly 1 is stored in the energy storage battery 3 or directly supplied to the user-side power supply 4. When there is no electricity demand, the electricity can be stored in the energy storage battery 3 or directly sold to the grid.

[0034] ​The first stop valve 9 is arranged on the connecting pipeline between the heat collection water tank 5 outlet and the sewage side circulation system, the second stop valve 10 is arranged on the sewage side circulation system outlet pipeline, and the third stop valve 11 is arranged on the connecting pipeline between the heat collection water tank 5 and the user side domestic hot water 21. The operation process of this part is as follows: when the sewage quantity is insufficient or the sewage inlet temperature is low, the heat collection water tank 5 of the PV / T system can be used for heat supplement, and the cold / heat supply energy efficiency is improved, at this time, the first stop valve 9 is opened. When the user has a domestic hot water demand, the third stop valve 11 is opened.

[0035] The sewage source heat pump system is composed of a sewage source heat pump 14, a user side water pump 19, secondary sewage water 12 from a sewage treatment plant after physical and chemical treatment, and user side cold supply / heat supply 20 to form a circulation. The sewage secondary water 12, the sewage water pump 13, and the sewage source heat pump 14 are sequentially connected to form a sewage side circulation system; the sewage source heat pump 14, the user side water pump 19, the user side cold supply / heat supply 20, and the fourth stop valve 23 are sequentially connected to form a user side circulation. The operation process is as follows: the second stop valve 10 is opened, the sewage side exchanges heat with the sewage source heat pump evaporator 16, the fourth stop valve 23 is opened, the user side cold supply / heat supply 20 exchanges heat with the sewage source heat pump condenser 17, and cold or heat is supplied to the user. When the sewage is insufficient, the PV / T system heat collection water tank 5 performs heat supplement. When the user is supplied with cold and heat, the four-way reversing valve in the sewage source heat pump 14 switches the flow direction of the refrigerant, and the sewage source heat pump evaporator 16 and the sewage source heat pump condenser 17 exchange heat to realize cold and heat supply switching.

[0036] The above-mentioned embodiments are only preferred technical solutions of the present application, and should not be regarded as limiting the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including the equivalent replacement solutions of the technical features in the claimed technical solutions. That is, the equivalent replacement improvement within this range is also within the protection scope of the present application.

Claims

1. A CCHP system of PV / T coupled sewage source heat pump, characterized in that: It comprises a PV / T assembly (1) and a sewage source heat pump system; the PV / T assembly (1) is sequentially connected with a heat collection water tank (5), a stop valve (6) and a heat collection circulating pump (7) to form a circulating heating system; The PV / T assembly (1) is sequentially connected with an energy storage battery (3) and a user-side power supply (4) to form a power supply system. The PV / T assembly (1) is connected with a power selling and grid connection (2) to form a power selling system. The outlet of the heat collection water tank (5) is connected with a user-side domestic hot water (21) through a pipeline. The sewage source heat pump system comprises a sewage source heat pump (14), a user-side water pump (19), sewage secondary water (12) and a user-side cooling and heating supply (20); the sewage secondary water (12) is sequentially connected with a sewage water pump (13) and the sewage source heat pump (14) to form a sewage-side circulating system.

2. The CCHP system of claim 1, wherein: The sewage source heat pump (14) is sequentially connected with the user-side water pump (19), the user-side cooling and heating supply (20) and a fourth stop valve (23) to form a user-side circulating system.

3. The CCHP system of claim 2, wherein: The outlet of the heat collection water tank (5) is connected with the user-side domestic hot water (21) and a heat supplement circulating pump (8) through pipelines; the heat supplement circulating pump (8) is used for supplying heat to the sewage secondary water (12) and the sewage source heat pump (14).

4. The CCHP system of claim 3, wherein: A third stop valve (11) is arranged on the pipeline between the heat collection water tank (5) and the user-side domestic hot water (21); a second stop valve (10) is arranged on the pipeline between the heat supplement circulating pump (8) and the sewage source heat pump (14).

5. The CCHP system of claim 4, wherein: The sewage source heat pump (14) comprises a sewage source heat pump compressor (15), a sewage source heat pump evaporator (16), a sewage source heat pump condenser (17) and a sewage source heat pump throttling valve (18); the sewage source heat pump compressor (15) is connected with the sewage source heat pump evaporator (16), the sewage source heat pump condenser (17) and the sewage source heat pump throttling valve (18) to form a refrigerant circulation; When the sewage source heat pump system is running, the second stop valve (10) is opened, the sewage is exchanged with the sewage source heat pump evaporator (16), the fourth stop valve (23) is opened, the user-side cooling and heating supply (20) is exchanged with the sewage source heat pump condenser (17) to supply cooling or heating for the user.

6. The CCHP system of claim 1, wherein: The circulating heating system is controlled to start and stop by a temperature difference control module (22).

7. The CCHP system of claim 1, wherein: The sewage secondary water (12) is sewage treated by physics and chemistry from a sewage treatment plant.

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