Multi-energy complementary heating and cooling system

Abstract

The utility model discloses a multi-energy complementary heating and cooling system which solves the technical problem that continuous and efficient operation of an existing energy supply system is affected due to soil heat unbalance. The system comprises a heat collection water tank and a heat compensation water tank which are connected with a solar heat collector assembly, the heat collection water tank is connected with an air source heat pump, and the heat compensation water tank is sequentially connected with a heat exchanger, a ground source heat pump and a user terminal. The solar heat collector assembly can be used for preparing domestic hot water and also can be used for immediately supplementing heat for the water outlet temperature of a buried pipe in a heating season, so that the water inlet temperature of the ground source heat pump is increased, soil heat balance is ensured, and continuous and efficient operation of an energy supply system is maintained; the energy supply system is provided with multiple operation modes, the modes are switched according to needs so as to achieve stable supply of heating, cooling and domestic hot water to the user terminals, a way is provided for comprehensive and efficient utilization of solar energy, geothermal energy and air energy, and efficient and stable application of renewable energy sources is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, ventilation, air conditioning and renewable energy utilization, in particular to a multi-energy complementary heating and cooling system. Background Art

[0002] Solar energy is a renewable energy source that is inexhaustible, safe, clean and pollution-free. Since the use of solar collectors is more dependent on weather conditions, the heating time is relatively unstable. At the same time, the hot water heating efficiency is also relatively low, and the solar energy utilization technology is greatly limited. Therefore, solar energy needs to be used in combination with other cold and heat sources to achieve continuous heating and cooling.

[0003] In the prior art, there have been cases of combining solar energy with geothermal energy and air energy, and realizing building heating and cooling through a solar ground source air source heat pump system. However, in cold regions in the north, since the heating demand in winter is greater than the cooling demand in summer, it will lead to the heat extraction from the soil by the ground source heat pump buried pipes being greater than the heat storage capacity of the soil. If the ground source heat pump buried pipes operate for a long time, the soil temperature around the buried pipe heat exchanger will drop year by year, forming "cold accumulation", causing soil thermal imbalance, the performance of the ground source heat pump to decline, and even extreme situations where it cannot be started in winter.

[0004] Therefore, there is a need to propose an energy supply system that can not only meet the requirements of stable heating, stable cooling and providing domestic hot water throughout the year, but also ensure soil thermal balance and operate continuously and efficiently. Summary of the Utility Model

[0005] In view of the deficiencies in the above background art, the utility model proposes a multi-energy complementary heating and cooling system, which solves the technical problem that the existing energy supply system is affected by soil thermal imbalance and affects the continuous and efficient operation of the system.

[0006] The technical solution of this application is as follows:

[0007] A multi-energy complementary heating and cooling system includes a hot water storage tank and a make-up hot water tank connected to a solar collector assembly. The hot water storage tank is connected to an air source heat pump, and the make-up hot water tank is sequentially connected to a heat exchanger, a ground source heat pump and a user terminal.

[0008] Preferably, a temperature detector I is provided in the hot water storage tank. The temperature detector I is connected to a controller, and the controller is connected to the air source heat pump.

[0009] Preferably, the controller is connected to the solar collector assembly.

[0010] Preferably, a temperature detector II is provided in the make-up hot water tank. The temperature detector II is connected to the controller.

[0011] Preferably, the controller is connected to the ground source heat pump.

[0012] Preferably, the solar collector assembly includes a first heat exchange coil disposed inside the hot water storage tank and a second heat exchange coil disposed inside the make-up hot water tank. The first and second heat exchange coils are connected in parallel and then sequentially connected to the PV / T module and the solar heat pump.

[0013] Preferably, a first float valve for real-time monitoring of the water level is provided inside the hot water storage tank. The first float valve is connected to a constant pressure water replenishment port one on the hot water storage tank for water replenishment. The hot water storage tank also has an outlet for supplying domestic hot water.

[0014] Preferably, a second float valve for real-time monitoring of the water level is provided inside the make-up hot water tank. The second float valve is connected to a constant pressure water replenishment port two on the hot water storage tank for water replenishment. The hot water storage tank also has a third heat exchange coil for connecting to a heat exchanger.

[0015] Preferably, the air source heat pump includes an evaporator one, a compressor one, a throttle valve one, and a condenser one connected in sequence. The condenser one is connected to the hot water storage tank.

[0016] Preferably, the ground source heat pump includes an evaporator two, a compressor two, a throttle valve two, and a condenser two connected in sequence. The condenser two is connected to the heat exchanger.

[0017] Compared with the prior art, the technical solution disclosed by the present utility model has the following beneficial effects:

[0018] The solar collector assembly of the present utility model can produce domestic hot water and can also instantaneously supplement heat to the outlet water temperature of the buried pipe during the heating season, improve the inlet water temperature of the heat source end of the ground source heat pump, ensure soil heat balance, and maintain the continuous and efficient operation of the energy supply system. It is applicable to the supply of domestic hot water at the user end of independent buildings and cooling during the heating season. The energy supply system of the present utility model is provided with multiple operation modes, and the modes are switched according to needs to achieve the stable supply of heating, cooling, and domestic hot water at the user end, providing a way for the comprehensive and efficient utilization of solar energy, geothermal energy, and air energy, and realizing the efficient and stable application of renewable energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the overall working principle diagram of the present utility model;

[0021] Figure 2 is the working principle diagram of the solar-air source heat pump for domestic hot water supply mode of the present utility model;

[0022] Figure 3 is the working principle diagram of the instant heat supplement heating mode of the ground source heat pump of the present utility model;

[0023] Figure 4 is the working principle diagram of the cooling mode of the ground source heat pump of the present utility model.

[0024] Explanation of the reference numerals in the attached drawings:

[0025] 1 air source heat pump unit, 2 evaporator I, 3 compressor I, 4 condenser I, 5 throttle valve I, 6 water pump I, 7 stop valve I, 8 stop valve II, 9 hot water storage tank, 10 float valve I, 11 solar collector assembly, 12 solar heat pump, 13 stop valve III, 14 heat exchange coil I, 15 stop valve IV, 16 stop valve V, 17 make-up hot water tank, 18 float valve II, 19 heat exchange coil II, 20 stop valve VI, 21 heat exchange coil III, 22 water pump II, 23 stop valve VII, 24 stop valve VIII, 25 heat exchanger, 26 stop valve IX, 27 stop valve X, 28 ground source heat pump unit, 29 evaporator II, 30 compressor II, 31 condenser II, 32 throttle valve II, 33 stop valve XI, 34 ground heat exchanger, 35 stop valve XII, 36 water pump III, 37 water pump IV, 38 user building, 39 constant pressure make-up port I, 40 constant pressure make-up port II, 41 constant pressure make-up port III, 42 constant pressure make-up port IV, 43 constant pressure make-up port V. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the core concept of the present utility model and the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] A multi-energy complementary heating and cooling system includes a hot water storage tank 9 and a make-up hot water tank 17 connected to a solar collector assembly 11. The hot water storage tank 9 is connected to an air source heat pump 1, and the make-up hot water tank 17 is sequentially connected to a heat exchanger 25, a ground source heat pump 28, and a user terminal 38. The solar collector assembly 11 can produce domestic hot water, and can also instantaneously supplement heat to the inlet water temperature of the heat source end of the ground source heat pump 28 through the make-up hot water tank 17 and the heat exchanger 25 during the heating season, so as to realize stable heating, cooling, and domestic hot water supply of the user terminal 38.

[0028] Specifically, as Figure 1As shown in the figure, the solar collector assembly 11 is connected to the hot water storage tank 9 through the solar heat pump 12, the third stop valve 13, the fourth stop valve 15 and the first heat exchange coil 14, and heat is stored in the hot water storage tank 9 through the solar collector assembly 11; the hot water storage tank 9 is connected to the air source heat pump 1 through the first stop valve 7, the second stop valve 8 and the first water pump 6. The air source heat pump 1 includes an evaporator 1 2, a compressor 1 3, a condenser 1 4, and a throttle valve 1 5 connected to each other. The hot water storage tank 9 is connected to the condenser 1 4 of the air source heat pump 1. There is also a water outlet for domestic hot water supply on the hot water storage tank 9. The connection or disconnection between the hot water storage tank 9 and the air source heat pump 1, and between the hot water storage tank 9 and the solar collector assembly 11 is controlled by the real-time water temperature in the hot water storage tank 9, and domestic hot water supply is realized through the heat complementarity between the hot water storage tank 9 and the air source heat pump 1.

[0029] The solar collector assembly 11 is connected to the make-up hot water tank 17 through the solar heat pump 12, the fifth stop valve 16, the sixth stop valve 20 and the second heat exchange coil 19. The make-up hot water tank 17 is connected to the heat exchanger 25 through the third heat exchange coil 21, the second water pump 22, the seventh stop valve 23 and the eighth stop valve 24. The heat exchanger 25 is also connected to the ground heat exchanger 34 and the ground source heat pump unit 28 through the eleventh stop valve 33, the twelfth stop valve 35 and the third water pump 36. The ground source heat pump unit 28 is connected to the user terminal 38 through the fourth water pump 37. The connection or disconnection between the hot water storage tank 9 and the solar collector assembly 11, between the solar collector assembly 11 and the make-up hot water tank 17, and between the make-up hot water tank 17 and the ground source heat pump 28 is controlled by the real-time water temperature in the hot water storage tank 9 and the make-up hot water tank 17 to ensure stable heating or cooling of the user terminal 38; heat is stored in the make-up hot water tank 17 through the solar collector assembly 11, heating is realized through the heat complementarity between the make-up hot water tank 17 and the ground source heat pump 28, and cooling is realized by switching the water flow sequence of the ground source heat pump 28.

[0030] Based on the above embodiments, a first temperature detector is provided in the hot water storage tank 9. The first temperature detector is connected to a controller, and the controller is connected to the air source heat pump 1. As Figure 1 shown in the figure, the solar heat pump 12 is turned on, the third stop valve 13 and the fourth stop valve 15 are turned on, the first stop valve 7 and the second stop valve 8 are turned off, and the first water pump 6 is turned off. The solar heat pump 12 is connected to the hot water storage tank 9. The solar collector assembly 11 continuously exchanges heat with the water in the hot water storage tank 9. The real-time water temperature in the hot water storage tank 9 is detected by the first temperature detector and the signal is transmitted to the controller. The controller controls the start and stop of the air source heat pump 1 according to the received temperature signal. When the water temperature in the hot water storage tank 9 is lower than 45 °C, the air source heat pump 1 starts to supplement heat to the hot water storage tank 9 to ensure the required domestic hot water.

[0031] Based on the above embodiments, the controller is connected to the solar collector assembly 11. The real-time water temperature in the hot water storage tank 9 is detected by the first temperature detector and the signal is transmitted to the controller. The controller controls the on-off of the hot water storage tank 9 and the solar collector assembly 11 according to the received temperature signal. When the water temperature in the hot water storage tank 9 is greater than 55 °C or the outlet water temperature of the solar collector assembly 11 is less than the water temperature in the hot water storage tank 9, the hot water storage tank 9 and the solar collector assembly 11 are disconnected, and the solar collector assembly 11 no longer heats the hot water storage tank 9.

[0032] Based on the above embodiments, a second temperature detector is provided in the make-up hot water tank 17, and the second temperature detector is connected to the controller. As Figure 1 shown, the solar collector assembly 11 is connected to the make-up hot water tank 17 through the solar energy heat pump 12, the fifth stop valve 16, the sixth stop valve 20 and the second heat exchange coil 19. The real-time water temperature in the make-up hot water tank 17 is detected by the second temperature detector and the signal is transmitted to the controller. The controller controls the connection or disconnection of the make-up hot water tank 17 and the solar collector assembly 11 according to the received real-time temperature signal in the make-up hot water tank 17. When the temperature of the solar collector assembly 11 is greater than the real-time water temperature in the make-up hot water tank 17, the fifth stop valve 16 and the sixth stop valve 20 are opened, and the solar collector assembly 11 heats the make-up hot water tank 17.

[0033] Based on the above embodiments, the controller is connected to the ground source heat pump 28. As Figure 1 shown, the make-up hot water tank 17 is connected to the heat exchanger 25 through the third heat exchange coil 21, the second water pump 22, the seventh stop valve 23 and the eighth stop valve 24. The heat exchanger 25 is also connected to the buried pipe heat exchanger 34 and the ground source heat pump unit 28 through the eleventh stop valve 33, the twelfth stop valve 35 and the third water pump 36. The ground source heat pump unit 28 is connected to the user terminal 38 through the fourth water pump 37. The controller controls the start and stop of the ground source heat pump 28 according to the received real-time temperature signal in the make-up hot water tank 17. When the water temperature in the make-up hot water tank 17 is 1-5 °C higher than the outlet water temperature of the buried pipe heat exchanger 34 of the ground source heat pump 28, the make-up hot water tank 17 heats the buried pipe heat exchanger 34 through the third heat exchange coil 21.

[0034] Based on the above embodiments, the solar collector assembly 11 includes a first heat exchange coil 14 disposed inside the hot water storage tank 9 and a second heat exchange coil 19 disposed inside the make-up hot water tank 17. The first heat exchange coil 14 and the second heat exchange coil 19 are connected in parallel and then connected to the PV / T assembly and the solar heat pump 12 in sequence. The solar collector assembly 11 collects solar energy through the PV / T assembly, and then transports the hot water to the first heat exchange coil 14 disposed inside the hot water storage tank 9 and the second heat exchange coil 19 disposed inside the make-up hot water tank 17 through the solar heat pump 12. Finally, the heat of solar energy is applied to the heat supplement process of the hot water storage tank 9 and the make-up hot water tank 17 through the first heat exchange coil 14 and the second heat exchange coil 19.

[0035] Based on the above embodiments, a first float valve 10 for real-time monitoring of the water level is disposed inside the hot water storage tank 9. The first float valve 10 is connected to a constant pressure water replenishment port 39 for water replenishment on the hot water storage tank 9. The hot water storage tank 9 also has an outlet for supplying domestic hot water. As Figure 1 shown, the hot water storage tank 9 includes a water outlet, a first float valve 10 for real-time monitoring of the water level, and a constant pressure water replenishment port 39 for water replenishment. Water replenishment to the hot water storage tank 9 stops from 6 pm to 8 am the next day, and is controlled at the highest water level by the first float valve 10 during other time periods. The hot water storage tank 9 replenishes water in a timely manner according to the water use needs, and the water replenishment time is the same as the operating time of the air source heat pump. Specifically, during water replenishment, the first float valve 10 is used to monitor the real-time water level. When the water level drops to the set value, the constant pressure water replenishment port 39 is opened to replenish water to the hot water storage tank 9, so that the hot water in the hot water storage tank 9 is always at the highest water level.

[0036] Based on the above embodiments, a second float valve 18 for real-time monitoring of the water level is disposed inside the make-up hot water tank 17. The second float valve 18 is connected to a constant pressure water replenishment port 40 for water replenishment on the hot water storage tank 9. The hot water storage tank 9 also has a third heat exchange coil 21 for connecting to the heat exchanger 25. As Figure 1 shown, the make-up hot water tank 17 includes a second float valve 18 for real-time monitoring of the water level and a constant pressure water replenishment port 40 for water replenishment. The water in the make-up hot water tank 17 is maintained at the highest water level by the second float valve 18. During water replenishment, the second float valve 18 is used to monitor the real-time water level. When the water level drops to the set value, the constant pressure water replenishment port 40 is opened to replenish water to the make-up hot water tank 17, so that the hot water in the make-up hot water tank 17 is always at the highest water level.

[0037] To prevent insufficient water pressure, in addition to the constant pressure water replenishment port 39 on the hot water storage tank 9 and the constant pressure water replenishment port 40 on the make-up hot water tank 17, a third constant pressure water replenishment port 41 is also provided between the make-up hot water tank 17 and the heat exchanger 25, a fourth constant pressure water replenishment port 42 is provided between the heat exchanger 25 and the ground source heat pump 28, and a fifth constant pressure water replenishment port 43 is provided between the ground source heat pump 28 and the user terminal 38.

[0038] Based on the above embodiments, the air source heat pump 1 includes an evaporator 2, a compressor 3, a throttle valve 5, and a condenser 4 that are connected in sequence, and the condenser 4 is connected to the hot water storage tank 9. When the temperature in the hot water storage tank 9 is lower than 45°C, the water is heated by operating the air source heat pump 1, and the hot water storage tank 9 is supplemented with heat.

[0039] Based on the above embodiments, the ground source heat pump 28 includes an evaporator 29, a compressor 30, a throttle valve 32, and a condenser 31 that are connected in sequence, and the condenser 31 is connected to the heat exchanger 25. When the water temperature in the make-up hot water tank 17 is 1-5°C higher than the outlet water temperature of the buried pipe heat exchanger 34 of the ground source heat pump 28, the make-up hot water tank 17 supplements heat to the buried pipe heat exchanger 34 through the heat exchange coil 21. By switching the sequence of water flowing into the evaporator 29 and the condenser 31, the switching between heating and cooling is realized.

[0040] When the multi-energy complementary heating and cooling system operates, its main modes are as follows:

[0041] Solar-air source heat pump for domestic hot water mode: As Figure 2 shown, the solar-air source heat pump for domestic hot water mode consists of the air source heat pump 1, the water pump 6, the stop valve 7, the stop valve 8, the solar collector assembly 11, the solar heat pump 12, the hot water storage tank 9, the stop valve 13, the stop valve 15, the heat exchange coil 14, and the circulation pipeline. Specifically, the water pump 6 is a circulation water pump.

[0042] Ground source heat pump instant heat supplement heating mode: As Figure 3 shown, the ground source heat pump instant heat supplement heating mode consists of the solar collector assembly 11, the solar heat pump 12, the make-up hot water tank 17, the heat exchange coil 19, the stop valve 16, the stop valve 20, the heat exchange coil 21, the water pump 22, the heat exchanger 25, the stop valve 23, the stop valve 24, the stop valve 26, the stop valve 27, the ground source heat pump unit 28, the buried pipe heat exchanger 34, the water pump 36, the stop valve 33, the stop valve 35, the water pump 37, and the circulation pipeline. Specifically, the heat exchanger 25 is a plate heat exchanger, the water pump 22 is a circulation water pump, the water pump 36 is a heat source side water pump, and the water pump 37 is a load side water pump.

[0043] Ground source heat pump cooling mode: As Figure 4 shown, the ground source heat pump cooling mode consists of the ground source heat pump unit 28, the buried pipe heat exchanger 34, the water pump 36, the stop valve 33, the stop valve 35, the water pump 37, the user terminal 38, and the circulation pipeline. Specifically, the water pump 36 is a heat source side water pump, and the water pump 37 is a load side water pump.

[0044] In summary, through the complementarity of solar energy and air energy, as well as the complementarity of solar energy and geothermal energy, the three working modes enable the continuous and efficient operation of the energy supply system, and further achieve the stable supply of domestic hot water, heating, and cooling for the user terminal 38.

[0045] The details not described in this utility model are all conventional technical means well known to those skilled in the art.

[0046] The above content shows and describes the basic principles, main features, and beneficial effects of this utility model. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this utility model shall be included within the protection scope of this utility model.

Claims

1. A multi-energy complementary heating and cooling system, characterized in that: It includes a hot water storage tank (9) and a make-up hot water tank (17) connected to a solar collector assembly (11). The hot water storage tank (9) is connected to an air source heat pump (1), and the make-up hot water tank (17) is sequentially connected to a heat exchanger (25), a ground source heat pump (28), and a user terminal (38).

2. The multi-energy complementary heating and cooling system according to claim 1, characterized in that: A first temperature detector is provided in the hot water storage tank (9). The first temperature detector is connected to a controller, and the controller is connected to the air source heat pump (1).

3. The poly-generation complementary heating and cooling system according to claim 2, wherein: The controller is connected to the solar collector assembly (11).

4. The poly-generation complementary heating and cooling system according to claim 3, wherein: A second temperature detector is provided in the make-up hot water tank (17). The second temperature detector is connected to the controller.

5. The poly-generation complementary heating and cooling system according to claim 4, wherein: The controller is connected to the ground source heat pump (28).

6. The multi-energy complementary heating and cooling system according to any one of claims 1-5, characterized in that: The solar collector assembly (11) includes a first heat exchange coil (14) provided inside the hot water storage tank (9) and a second heat exchange coil (19) provided inside the make-up hot water tank (17). After the first heat exchange coil (14) and the second heat exchange coil (19) are connected in parallel, they are sequentially connected to a PV / T module and a solar heat pump (12).

7. The poly-generation complementary heating and cooling system according to claim 6, characterized in that: A first float valve (10) for real-time monitoring of the water level is provided in the hot water storage tank (9). The first float valve (10) is connected to a constant pressure make-up water port one (39) for water make-up on the hot water storage tank (9). The hot water storage tank (9) is also provided with an outlet for supplying domestic hot water.

8. The multi-energy complementary heating and cooling system according to claim 7, wherein: A second float valve (18) for real-time monitoring of the water level is provided in the make-up hot water tank (17). The second float valve (18) is connected to a constant pressure make-up water port two (40) for water make-up on the hot water storage tank (9). The hot water storage tank (9) is also provided with a third heat exchange coil (21) for connecting to the heat exchanger (25).

9. The poly-generation complementary heating and cooling system according to claim 8, wherein: The air source heat pump (1) includes an evaporator one (2), a compressor one (3), a throttle valve one (5), and a condenser one (4) connected in sequence. The condenser one (4) is connected to the hot water storage tank (9).

10. The multi-energy complementary heating and cooling system according to claim 9, wherein: The ground source heat pump (28) includes an evaporator two (29), a compressor two (30), a throttle valve two (32), and a condenser two (31) connected in sequence. The condenser two (31) is connected to the heat exchanger (25).

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