A split composite ground source heat pump heating and cooling system

Abstract

The present invention discloses a split type composite ground source heat pump heating and cooling system, which is applied to the field of heating and cooling, and comprises a heat pump unit, wherein the output end of the heat pump unit is connected to a user terminal, and the input end of the heat pump unit is respectively connected to a ground circulation loop, a heat circulation loop and a cold circulation loop through a first control valve and a second control valve; the present invention has a simple structure, is convenient to control, and has good heating and cooling effects; the arrangement of the heat circulation loop and the cold circulation loop is beneficial to maintaining the relative balance of underground energy, and improves the stability and reliability of the system; by controlling different control valves, six operating modes can be realized under different working conditions, namely, underground pipe heating, solar energy heating, underground pipe and solar energy combined heating, underground pipe cooling, cooling tower cooling, and underground pipe and cooling tower combined cooling; the system has the advantages of convenient operation, low manufacturing cost, obvious control effect, and needs to be vigorously promoted.

Description

Technical Field

[0001] The invention relates to the field of heating and cooling, and in particular to a split type composite ground source heat pump heating and cooling system. Background Art

[0002] The northern part of my country is cold in winter and hot in summer. If people want to have a comfortable living environment, they need heating facilities in winter and refrigeration equipment in summer.

[0003] At present, heating is mainly based on burning loose coal, with a large total amount of coal burning and large pollutant emissions. In addition, with the development of economy and society, non-renewable resources such as coal are becoming less and less, so it is necessary to develop new heating resources. The development and utilization of natural clean energy such as soil energy, solar energy, and air energy are becoming more and more important. The development and utilization of shallow geothermal energy resources as a cold and heat source for buildings has a good energy-saving and emission reduction effect. However, due to the influence of geological conditions, the drilling cost is high, and the long operation time in winter is prone to cold accumulation problems, affecting the normal operation of the system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a split composite ground source heat pump heating and cooling system, which can meet the heating and cooling needs of user terminals by controlling different control valves and rationally utilizing solar energy, soil energy and cooling tower cold energy. It has simple operation, low production cost and good heating and cooling effects.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The present invention comprises a heat pump unit, the output end of which is connected to a user terminal, and the input end of which is connected to a ground circulation loop, a heat circulation loop and a cold circulation loop respectively through a first control valve and a second control valve.

[0007] A further improvement of the present invention is that the ground circulation loop includes a heat pump unit and an underground pipe connected by a pipeline, and the pipeline is provided with a first control valve, a third control valve, a geothermal circulation pump, a fourth control valve and a second control valve. The heat pump unit is connected to one end of the underground pipe in sequence through the first control valve, the third control valve and the geothermal circulation pump connected in series, and the other end of the underground pipe is connected to the heat pump unit in sequence through the fourth control valve and the second control valve.

[0008] A further improvement of the present invention is that the heat circulation loop includes a heat exchange coil connected to the heat pump unit through a pipeline, the heat exchange coil is arranged in a hot water storage tank, and the pipeline is provided with a first control valve, a fifth control valve, a heat circulation pump, a sixth control valve, a seventh control valve and a second control valve, the heat pump unit is connected to one end of the heat exchange coil through the first control valve and the fifth control valve connected in series in sequence, and the other end of the heat exchange coil is connected to the heat pump unit through the heat circulation pump, the sixth control valve, the seventh control valve and the second control valve in sequence.

[0009] A further improvement of the present invention is that the heat storage tank is connected to the solar thermal collector through a pipeline, and a heat collection circulation pump, an eighth control valve and a ninth control valve are provided on the pipeline. The heat storage tank is connected to one end of the solar thermal collector through the heat collection circulation pump and the eighth control valve in sequence, and the other end of the solar thermal collector is connected to the heat storage tank through the ninth control valve.

[0010] A further improvement of the present invention is that the cold circulation loop includes a cooling tower connected to the heat pump unit through a pipeline, and the pipeline is provided with a first control valve, a tenth control valve, a cold circulation pump, an eleventh control valve, a seventh control valve and a second control valve. The heat pump unit is connected to one end of the cooling tower through the first control valve and the tenth control valve connected in series, and the other end of the cooling tower is connected to the heat pump unit through the cold circulation pump, the eleventh control valve, the seventh control valve and the second control valve connected in series in sequence.

[0011] A further improvement of the present invention is that the cooling tower is connected to a water replenishment device.

[0012] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are:

[0013] The present invention has a simple structure, convenient control, good heating and cooling effects, and strong practicality. By providing heat to users through a heat cycle loop, the amount of heat extracted from the underground by the buried pipe can be reduced on the one hand, and the stability of the system can be enhanced on the other hand; by a cold cycle loop, the amount of cold extracted from the underground can be reduced. The setting of the heat cycle loop and the cold cycle loop can reduce the consumption of underground energy, ensure the relative balance of underground energy, be beneficial to ecological balance, and improve the stability and reliability of the system.

[0014] The present invention connects the heat pump unit in parallel with the underground pipe, cooling tower and hot water storage tank respectively, and can realize multiple operation modes under different working conditions by controlling different control valves. Its operation modes include underground pipe heating, solar heating, underground pipe and solar combined heating, underground pipe cooling, cooling tower cooling, and underground pipe and cooling tower combined cooling. It is easy to operate, low in production cost, and has obvious control effect, so it is necessary to promote it vigorously. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Among them, 1. User terminal; 2. Heat pump unit; 3. First control valve; 4. Fifth control valve; 5. Tenth control valve; 6. Heat storage tank; 7. Heat collection circulation pump; 8. Ninth control valve; 9. Solar collector; 10. Eighth control valve; 11. Heat circulation pump; 12. Sixth control valve; 13. Water replenishment device; 14. Cooling tower; 15. Cold circulation pump; 16. Eleventh control valve; 17. Third control valve; 18. Geothermal circulation pump; 19. Second control valve; 20. Fourth control valve; 21. Seventh control valve; 22. Buried pipe; 23. Heat exchange coil. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with embodiments:

[0018] A split type composite ground source heat pump heating and cooling system, such as Figure 1 As shown, it includes a heat pump unit 2, the output end of the heat pump unit 2 is connected to the user terminal 1, and the input end of the heat pump unit 2 is respectively connected to the ground circulation loop, the heat circulation loop and the cold circulation loop through the first control valve 3 and the second control valve 19. The ground circulation loop can provide heating in winter and cooling in summer, but excessive development and utilization of underground energy will destroy the ecological balance of underground energy; in order to reduce the consumption of underground energy, it is necessary to develop other ways to provide heating or cooling for the user terminal 1. Here, a heat circulation loop using a solar collector 9 for heating in winter and a cold circulation loop using a cooling tower 14 for cooling in summer are set.

[0019] The ground circulation loop includes a heat pump unit 2 and a buried pipe 22 connected by a pipeline, and the pipeline is provided with a first control valve 3, a third control valve 17, a ground energy circulation pump 18, a fourth control valve 20 and a second control valve 19. The heat pump unit 2 is connected to one end of the buried pipe 22 through the first control valve 3, the third control valve 17 and the ground energy circulation pump 18 connected in series in sequence, and the other end of the buried pipe 22 is connected to the heat pump unit 2 through the fourth control valve 20 and the second control valve 19 in sequence.

[0020] like Figure 1As shown, the heat circulation loop includes a heat exchange coil 23 connected to the heat pump unit 2 through a pipeline, and the heat exchange coil is arranged in the hot water storage tank 6. The heat pump unit 2 forms a heat circulation loop between the heat pump unit 2 and the heat exchange coil 23 through the first control valve 3, the fifth control valve 4, the heat circulation pump 11, the sixth control valve 12, the seventh control valve 21 and the second control valve 19 arranged on the pipeline. The heat pump unit 2 heats the user terminal 1 through the heat provided by the heat exchange coil 23 in the heat circulation loop. The heat pump unit 2 is connected to one end of the heat exchange coil 23 through the first control valve 3 and the fifth control valve 4 in series in sequence, and the other end of the heat exchange coil 23 is connected to the heat pump unit 2 through the heat circulation pump 11, the sixth control valve 12, the seventh control valve 21 and the second control valve 19 in sequence.

[0021] The hot water storage tank 6 is connected to the solar thermal collector 9 through a pipeline, and a heat collection circulation pump 7, an eighth control valve 10 and a ninth control valve 8 are provided on the pipeline. The hot water storage tank 6 is connected to one end of the solar thermal collector 9 through the heat collection circulation pump 7 and the eighth control valve 10 in sequence, and the other end of the solar thermal collector 9 is connected to the hot water storage tank 6 through the ninth control valve 8.

[0022] like Figure 1 As shown, the cold circulation loop includes a cooling tower 14 connected to the heat pump unit 2 through a pipeline, and a cold circulation loop is formed between the heat pump unit 2 and the cooling tower 14 through the first control valve 3, the tenth control valve 5, the cold circulation pump 15, the eleventh control valve 16, the seventh control valve 21 and the second control valve 19 arranged on the pipeline to supply cold to the user terminal 1. The heat pump unit 2 is connected to one end of the cooling tower 14 through the first control valve 3 and the tenth control valve 5 connected in series, and the other end of the cooling tower 14 is connected to the heat pump unit 2 through the cold circulation pump 15, the eleventh control valve 16, the seventh control valve 21 and the second control valve 19 connected in series in sequence, and the cooling tower 14 is connected to the water replenishment device 13. When water replenishment is needed in the cooling tower 14, the water replenishment device 13 can be automatically replenished through the built-in float valve of the cooling tower 14.

[0023] Underground pipe cooling / heating: When the light is not good at night or in rainy weather, the solar collector 9 cannot provide heating; when the outdoor temperature is too high and the cooling tower 14 is not enough to provide coldness on the user side, the ground circulation loop can only be used to heat or cool the user terminal 1 to meet people's living needs. At this time, you only need to open the first control valve 3, the third control valve 17, the geothermal circulation pump 18, the fourth control valve 20 and the second control valve 19 to form a complete loop between the heat pump unit 2 and the underground pipe 22, and extract heat from the geothermal energy near the underground pipe 22 to heat the user terminal 1, or extract cold to cool the user terminal 1 to meet people's heating and cooling needs. At this time, all other control valves except the first control valve 3, the third control valve 17, the fourth control valve 20 and the second control valve 19 need to be closed.

[0024] Solar heating: In weather with good light intensity, the solar collector 9 absorbs the heat of the sun, and transfers the heat in the solar collector 9 to the hot water tank 6 through the opened heat collection circulation pump 7, the eighth control valve 10 and the ninth control valve 8. The temperature of the water in the hot water tank 6 rises. When the water temperature in the hot water tank 6 is much higher than the water temperature at the outlet of the buried pipe 22, only the heat circulation loop is needed to heat the user terminal 1. As long as the opened first control valve 3, the fifth control valve 4, the heat circulation pump 11, the sixth control valve 12, the seventh control valve 21 and the second control valve 19 transfer the heat of the hot water in the hot water tank 6 to the heat pump unit 2, the user terminal 1 at the output end of the heat pump unit 2 can be heated.

[0025] Combined heating of underground pipe and solar energy: When the sunlight is not sufficient, the water temperature in the heat storage tank 6 is lower than the outlet water temperature of the underground pipe 22, and the underground pipe 22 is not enough to bear the heat load of the user terminal 1, the solar collector 9 and the underground pipe 22 are needed to heat the user terminal 1. At this time, it is necessary not only to open the heat collection circulation pump 7, the eighth control valve 10 and the ninth control valve 8, but also to open the first control valve 3, the fifth control valve 4, the heat circulation pump 11, the sixth control valve 12, the seventh control valve 21 and the second control valve 19 between the heat exchange coil 23 and the heat pump unit 2, and to open the first control valve 3, the third control valve 17, the geothermal circulation pump 18, the fourth control valve 20 and the second control valve 19 between the underground pipe 22 and the heat pump unit 2, so as to realize that the underground pipe 22 and the solar collector 9 simultaneously transport heat to the input side of the heat pump unit 2, which is sufficient to meet the heat transported from the energy output side of the heat pump unit 2 to the user terminal 1 and meet the heating demand of the user terminal 1.

[0026] Cooling tower cooling: When the cooling load is not large, the cooling tower 14 alone is sufficient to provide cold air volume for the user terminal 1 to reduce the indoor temperature. At this time, only the first control valve 3, the tenth control valve 5, the cold circulation pump 15, the eleventh control valve 16, the seventh control valve 21 and the second control valve 19 need to be opened, and all other control valves are closed. At this time, the heat pump unit 2 and the cooling tower 14 are running, and the cold energy is transmitted to the input side of the heat pump unit 2 through the cold circulation loop, and the heat pump unit 2 transmits the cold energy to the user terminal 1 through the energy output side.

[0027] Combined cooling by underground pipes and cooling towers: When the outdoor temperature is too high or the underground pipes 22 are insufficient to bear the cooling capacity on the user side, the underground pipes 22 and cooling towers 14 need to be combined to provide cooling for the user terminal 1. At this time, it is necessary not only to open the first control valve 3, the tenth control valve 5, the cold circulation pump 15, the eleventh control valve 16, the seventh control valve 21 and the second control valve 19, but also to open the first control valve 3, the third control valve 17, the geothermal circulation pump 18, the fourth control valve 20 and the second control valve 19 at the same time to ensure that the underground pipes 22 and the cooling tower 14 are connected in parallel to deliver cooling capacity to the energy input side of the heat pump unit 2, and the heat pump unit 2 delivers cooling capacity to the user terminal 1 through the energy output side to meet the cooling demand of the user terminal 1.

[0028] In summary, by controlling different control valves, different modes of heating or cooling can be easily converted, and at the same time, the various devices between the various circuits can be isolated from each other. The operation is simple, easy to control, and convenient to maintain.

[0029] Finally, it should be noted that the above examples are only used to illustrate the present invention, and are not exclusive, nor are they limiting the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here, and the obvious changes or modifications derived from them still fall within the scope of protection of the present invention.

Claims

1. A split type composite ground source heat pump heating and cooling system, characterized in that: It comprises a heat pump unit (2), wherein the output end of the heat pump unit (2) is connected to a user terminal (1), and the input end of the heat pump unit (2) is connected to a ground circulation loop, a heat circulation loop and a cold circulation loop respectively through a first control valve (3) and a second control valve (19); The ground circulation loop comprises a heat pump unit (2) and a buried pipe (22) connected by a pipeline, wherein the pipeline is provided with a first control valve (3), a third control valve (17), a ground energy circulation pump (18), a fourth control valve (20) and a second control valve (19), wherein the heat pump unit (2) is connected to one end of the buried pipe (22) in sequence through the first control valve (3), the third control valve (17) and the ground energy circulation pump (18) connected in series, and the other end of the buried pipe (22) is connected to the heat pump unit (2) in sequence through the fourth control valve (20) and the second control valve (19); The heat circulation loop comprises a heat exchange coil (23) connected to the heat pump unit (2) via a pipeline, the heat exchange coil (23) being arranged in a hot water storage tank (6), the pipeline being provided with a first control valve (3), a fifth control valve (4), a heat circulation pump (11), a sixth control valve (12), a seventh control valve (21) and a second control valve (19), the heat pump unit (2) being connected to one end of the heat exchange coil (23) in sequence via the first control valve (3) and the fifth control valve (4) connected in series, and the other end of the heat exchange coil (23) being connected to the heat pump unit (2) in sequence via the heat circulation pump (11), the sixth control valve (12), the seventh control valve (21) and the second control valve (19); The cold circulation loop comprises a cooling tower (14) connected to the heat pump unit (2) via a pipeline, wherein the pipeline is provided with a first control valve (3), a tenth control valve (5), a cold circulation pump (15), an eleventh control valve (16), a seventh control valve (21) and a second control valve (19); the heat pump unit (2) is connected to one end of the cooling tower (14) via the first control valve (3) and the tenth control valve (5) connected in series, and the other end of the cooling tower (14) is connected to the heat pump unit (2) via the cold circulation pump (15), the eleventh control valve (16), the seventh control valve (21) and the second control valve (19) connected in series in sequence.

2. A split type composite ground source heat pump heating and cooling system according to claim 1, characterized in that: The heat storage tank (6) is connected to the solar thermal collector (9) via a pipeline, and a heat collection circulation pump (7), an eighth control valve (10) and a ninth control valve (8) are provided on the pipeline. The heat storage tank (6) is connected to one end of the solar thermal collector (9) via the heat collection circulation pump (7) and the eighth control valve (10) in sequence, and the other end of the solar thermal collector (9) is connected to the heat storage tank (6) via the ninth control valve (8).

3. A split type composite ground source heat pump heating and cooling system according to claim 2, characterized in that: The cooling tower (14) is connected to the water replenishment device (13).

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