Ground source heat energy and solar energy cascade coupling heat supply system

Abstract

The utility model discloses a ground source heat energy and solar energy cascade coupling heat supply system, which belongs to the technical field of heat supply systems and comprises a solar heat collector, a geothermal well, a heat pump and a heat utilization tail end. The heat pump comprises a first evaporator, a second evaporator and a condenser which are connected in series, the condenser is connected with the heat using tail end through a heat supply pipeline, the heat supply pipeline is used for circularly supplying heat to the heat using tail end, the first evaporator is connected with the three-way valve through a first pipeline, and the second evaporator is connected with the three-way valve through a second pipeline. The geothermal well is communicated with the second evaporator through a second pipeline, and the three-way valve is connected with the heat supply pipeline through a third pipeline. Double heat sources of solar energy and geothermal energy are adopted for heat supply, cascade heat exchange of different grades of heat energy is achieved through the heat pump, and the utilization efficiency of the solar energy is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating systems, and particularly relates to a heating system with cascade coupling of ground source thermal energy and solar energy. Background Art

[0002] There are many types of heat sources for heating buildings, among which clean energy includes geothermal heating and solar heating. Geothermal heating is a way to use underground heat energy to provide heating for buildings. Groundwater is extracted through geothermal wells and then transported to the heating system in the building. Through heat exchangers and other equipment, the heat energy is transferred to the indoor air to achieve the purpose of heating. Solar energy has the disadvantages of unbalanced, discontinuous and unstable heat supply in the short-term and long-term (cross-season) time scales, resulting in low solar energy utilization efficiency. To this end, we propose a heating system that couples ground source thermal energy and solar energy in a cascade. Utility Model Content

[0003] The purpose of the utility model is to provide a heating system that couples ground source thermal energy with solar energy in a cascade manner, aiming to solve the problem of low utilization rate of clean energy in the prior art in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A heating system that couples geothermal energy and solar energy in a cascade manner, comprising a solar collector, a geothermal well, a heat pump and a heat-using terminal, wherein a three-way valve is respectively arranged at the medium inlet and outlet of the solar collector, the heat pump comprises a first evaporator, a second evaporator and a condenser connected in series, the condenser is connected to the heat-using terminal via a heating pipeline, the heating pipeline is used for circulating heat to the heat-using terminal, the first evaporator is connected to the three-way valve via a first pipeline, the geothermal well is connected to the second evaporator via a second pipeline, and the three-way valve is connected to the heating pipeline via a third pipeline.

[0006] Furthermore, the first pipeline is provided with a first solenoid valve, a fourth pipeline is arranged between the geothermal well and the first pipeline, the connecting end of the fourth pipeline and the first pipeline is located between the three-way valve and the first solenoid valve, and the fourth pipeline is provided with a second solenoid valve, and the second solenoid valve is used to control the on and off of the fourth pipeline.

[0007] Furthermore, it also includes a controller, the solar collector is provided with a temperature sensor, and the controller is electrically connected to the three-way valve, the first solenoid valve, the second solenoid valve and the temperature sensor respectively.

[0008] Furthermore, the heat pump also includes a compressor, and the compressor is a magnetic levitation compressor.

[0009] Compared with the shortcomings and deficiencies of the prior art, the utility model has the following beneficial effects.

[0010] 1. The utility model provides a heating system of geothermal energy and solar energy cascade coupling, which adopts solar collectors and geothermal wells for synchronous heating, and realizes cascade heat exchange of heat energy of different grades by connecting a first evaporator and a second evaporator in series in a heat pump, so as to make up for the shortcomings of unbalanced, discontinuous and unstable heat supply of solar energy. According to the heating temperature of the solar collector, the solar collector is regulated to directly supply the heat-using terminal, or is connected to the heat-using terminal through a heat pump, which is beneficial to improving the utilization efficiency of solar energy.

[0011] 2. During the non-heating period, close the first solenoid valve and open the second solenoid valve to connect the first pipeline with the fourth pipeline, and use the solar collector to supplement heat for the geothermal well to alleviate the problem of geothermal attenuation caused by long-term use of geothermal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the connection structure of a heating system of cascade coupling of ground source thermal energy and solar energy in the utility model.

[0013] In the figure: 1-solar collector; 2-geothermal well; 3-heat pump; 4-heat end; 5-three-way valve; 6-first evaporator; 7-second evaporator; 8-compressor; 9-condenser; 10-expansion valve; 11-first pipeline; 12-second pipeline; 13-third pipeline; 14-heating pipeline; 15-controller; 16-first solenoid valve; 17-second solenoid valve; 18-fourth pipeline. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0015] Reference Figure 1 A heating system that couples geothermal energy and solar energy in a cascade manner includes a solar collector 1, a geothermal well 2, a heat pump 3 and a heat-using terminal 4. The solar collector 1 and the geothermal well 2 are respectively used as heat sources, and heat is provided to the heat-using terminal 4 after being heated by the heat pump 3.

[0016] The solar thermal collector 1 is used to absorb solar energy and use the solar energy to heat the medium. The medium inlet and outlet of the solar thermal collector 1 are respectively provided with three-way valves 5. The three-way valve 5 has a first port, a second port and a third port. The first port is always connected to the solar thermal collector 1.

[0017] The geothermal well 2 is a medium-deep buried pipe geothermal well, and the geothermal well 2 uses geothermal energy as a heat source.

[0018] The heat pump 3 includes a first evaporator 6, a second evaporator 7, a compressor 8, a condenser 9 and an expansion valve 10 connected in series, wherein a first pipeline 11 is arranged between the first evaporator 6 and the second port of the three-way valve 5, the solar collector 1 transports the heated medium to the first evaporator 6 through the first pipeline 11 for heat exchange, and the medium flows back to the solar collector 1 along the first pipeline 11 after heat exchange; a second pipeline 12 is arranged between the second evaporator 7 and the geothermal well 2, the medium heated in the geothermal well 2 is transported to the second evaporator 7 through the second pipeline 12 for heat exchange, and the medium flows back to the geothermal well 2 along the second pipeline 12 after heat exchange. The degrees are different, so the first evaporator 6 and the second evaporator 7 connected in series can realize the step-by-step heat exchange of thermal energy of different grades, and increase the heat exchange process, so as to meet the heat exchange demand of the dual heat sources of solar energy and geothermal energy coupled; a heating pipeline 14 is arranged between the condenser 9 and the heat-using end 4, and the medium in the heating pipeline 14 is transported to the heat-using end 4 along the heating pipeline 14 after heat exchange with the condenser 9, and flows back to the condenser 9 after heating; the compressor 8 is preferably a magnetic levitation compressor; the medium heated by the solar collector 1 and the medium heated by the geothermal well 2 are respectively stepped into the first evaporator 6 and the second evaporator 7 for heat exchange, and then supplied to the heat-using end 4 after heat exchange and temperature increase by the compressor 8 and the condenser 9.

[0019] A third pipeline 13 is arranged between the third port of the three-way valve 5 and the heating pipeline 14 . When the first end is connected to the third end, the medium heated by the solar collector 1 enters the heating pipeline 14 through the third pipeline 13 , and can directly provide heat to the heat-using end 4 .

[0020] In one embodiment, the first pipeline 11 is provided with a first solenoid valve 16, and a fourth pipeline 18 is arranged between the geothermal well 2 and the first pipeline 11. The connecting end of the fourth pipeline 18 and the first pipeline 11 is located between the three-way valve 5 and the first solenoid valve 16. The fourth pipeline 18 is provided with a second solenoid valve 17, and the second solenoid valve 17 is used to control the on and off of the fourth pipeline 18.

[0021] In one embodiment, the heating system of the geothermal energy and solar energy cascade coupling is provided with a controller 15, and the solar collector 1 is provided with a temperature sensor. The controller 15 is electrically connected to the three-way valve 5, the first solenoid valve 16, the second solenoid valve 17 and the temperature sensor respectively. The temperature sensor transmits the medium temperature output by the solar collector 1 to the controller 15. According to the medium temperature, the controller 15 controls the three-way valve 5 to connect the first port with the second port, or the first port with the third port; the controller 15 is also used to control the first solenoid valve 16 to open and the second solenoid valve 17 to close during the heating period, or to control the first solenoid valve 16 to close and the second solenoid valve 17 to open during the non-heating period.

[0022] During the heating period:

[0023] The controller 15 controls the first solenoid valve 16 to open and the second solenoid valve 17 to close, and the solar collector 1 and the geothermal well 2 are used as heat sources to provide heat at the same time.

[0024] When the medium temperature is high after being heated by the solar collector 1, that is, the medium temperature is within the heat exchange temperature range of the condenser 9, the controller 15 controls the first port of the three-way valve 5 to be connected with the third port, and the medium in the solar collector 1 flows into the heating pipeline 14 through the third pipeline 13. At the same time, the geothermal well 2 passes through the second evaporator 7, the compressor 8 and the condenser 9, and continuously supplies heat to the heat-using terminal 4 through the heating pipeline 14.

[0025] When the medium temperature is low after being heated by the solar collector 1, that is, the medium temperature is lower than the heat exchange temperature of the condenser 9, the controller 15 controls the first port of the three-way valve 5 to be connected with the second port, and the solar collector 1 is connected to the first evaporator 6 through the first pipeline 11 for heating. At this time, the solar collector 1 and the geothermal well 2 realize step heat exchange of different grades of thermal energy through the first evaporator 6 and the second evaporator 7, increase heat through the compressor 8 and the condenser 9, and supply heat to the heat-using terminal 4 through the heating pipeline 14.

[0026] During the non-heating period:

[0027] The controller 15 controls the first port of the three-way valve 5 to be connected with the second port, and at the same time the first solenoid valve 16 is closed and the second solenoid valve 17 is opened, so that the solar collector 1 is connected with the geothermal well 2 through the first pipeline 11 and the fourth pipeline 18. The solar collector 1 is used to supplement heat for the geothermal well 2. On the one hand, it is helpful to reduce the shortening of the service life of the solar collector 1 due to the sun, and on the other hand, it is helpful to alleviate the problem of geothermal attenuation caused by the long-term use of the geothermal well 2.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating system combining geothermal energy and solar energy in a cascade coupling manner, comprising a solar collector (1), a geothermal well (2), a heat pump (3) and a heat-using terminal (4), characterized in that: The medium inlet and outlet of the solar collector (1) are respectively provided with three-way valves (5); the heat pump (3) comprises a first evaporator (6), a second evaporator (7) and a condenser (9) which are connected in series; the condenser (9) is connected to the heat-using end (4) via a heat supply pipeline (14); the heat supply pipeline (14) is used to circulate heat to the heat-using end (4); the first evaporator (6) is connected to the three-way valve (5) via a first pipeline (11); the geothermal well (2) is connected to the second evaporator (7) via a second pipeline (12); and the three-way valve (5) is connected to the heat supply pipeline (14) via a third pipeline (13).

2. The heating system of geothermal energy and solar energy cascade coupling according to claim 1, characterized in that: The first pipeline (11) is provided with a first solenoid valve (16); a fourth pipeline (18) is provided between the geothermal well (2) and the first pipeline (11); a connecting end of the fourth pipeline (18) and the first pipeline (11) is located between the three-way valve (5) and the first solenoid valve (16); the fourth pipeline (18) is provided with a second solenoid valve (17); the second solenoid valve (17) is used to control the on-off of the fourth pipeline (18).

3. The heating system of geothermal energy and solar energy cascade coupling as claimed in claim 2, characterized in that: It also comprises a controller (15), the solar thermal collector (1) is provided with a temperature sensor, and the controller (15) is electrically connected to the three-way valve (5), the first solenoid valve (16), the second solenoid valve (17) and the temperature sensor respectively.

4. The heating system of geothermal energy and solar energy cascade coupling according to claim 1, characterized in that: The heat pump (3) further comprises a compressor (8), wherein the compressor (8) is a magnetic suspension compressor.

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