Heating and refrigerating system based on efficient utilization of geothermal energy

Abstract

The utility model provides a heating and refrigerating system based on efficient utilization of geothermal energy. The heating and refrigerating system comprises a heat exchange unit and a first heat exchanger. The heat exchange unit is connected with a heating system and provided with a geothermal water inlet and a geothermal water outlet. A geothermal water inlet of the heat exchange unit is connected with a water outlet pipeline of the geothermal well. The first heat exchanger is provided with a heating medium inlet, a heating medium outlet, a refrigerant inlet and a refrigerant outlet. And a heating medium inlet and a heating medium outlet of the first heat exchanger are connected with a fan coil in the air conditioning unit. A refrigerant inlet of the first heat exchanger is connected with a heating medium outlet of the heat exchange unit, and a refrigerant outlet of the first heat exchanger is connected with a recharge pipeline of the geothermal well. According to the heating and refrigerating system based on efficient utilization of the geothermal energy, refrigeration of special places can be achieved, heat compensation can be conducted on the geothermal water, meanwhile, the standing time of the geothermal water in the heat exchange unit can be properly prolonged, or the heat exchange area can be increased, and therefore it is guaranteed that the heating unit extracts more heat in unit time, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of geothermal energy exploitation, and particularly relates to a heating and cooling system based on efficient utilization of geothermal energy. Background Technique

[0002] Geothermal energy refers to the thermal energy inside the earth, which is a renewable energy source with the characteristics of cleanness, renewability and good stability. This kind of energy can be converted into utilizable heat energy or electric energy. Geothermal energy is usually directly used in the heating system, and the extraction of geothermal energy is realized through heat exchange with the heating system.

[0003] In the prior art, in order to ensure the recycling of geothermal energy, the geothermal tail water obtained after heat exchange between geothermal water and the heating system is usually re-injected into the geothermal well. In order to ensure that the tail water re-injected into the geothermal well does not affect the formation temperature, the geothermal tail water usually needs to have a certain temperature. For example, the water temperature of the re-injected water is maintained at about 20 °C, which makes the heat exchange have certain limitations. At the same time, in winter, some places need to be cooled, such as storage cabinets, equipment rooms and data rooms. The temperature of these places is usually higher than the outdoor temperature and lower than the indoor temperature. In order to ensure the constant temperature of these places, air-conditioning units are usually set up, resulting in a large amount of energy waste. Therefore, how to utilize geothermal energy in both the heating system and the cooling of special places is a problem to be solved by those skilled in the art. Summary of the Utility Model

[0004] An embodiment of the utility model provides a heating and cooling system based on efficient utilization of geothermal energy, aiming to be able to realize the purpose of using geothermal energy in both heating and cooling.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a heating and cooling system based on efficient utilization of geothermal energy, including:

[0006] A heat exchange unit, connected to the heating system, having a geothermal water inlet and a geothermal water outlet; the geothermal water inlet of the heat exchange unit is connected to the outlet pipeline of the geothermal well;

[0007] A first heat exchanger, having a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet and the heat medium outlet of the first heat exchanger are connected to the fan coil in the air-conditioning unit; the refrigerant inlet of the first heat exchanger is connected to the heat medium outlet of the heat exchange unit, and the refrigerant outlet of the first heat exchanger is connected to the re-injection pipeline of the geothermal well.

[0008] In a possible implementation manner, the first heat exchanger is a plate heat exchanger.

[0009] In a possible implementation manner, the heat exchange unit includes:

[0010] The second heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet of the second heat exchanger is connected to the outlet pipeline of the geothermal well, and the refrigerant inlet and the refrigerant outlet of the second heat exchanger are connected to the heating system;

[0011] The third heat exchanger has a heat medium inlet, a heat medium outlet, a refrigerant inlet, and a refrigerant outlet; the heat medium inlet of the third heat exchanger is connected to the heat medium outlet of the second heat exchanger, and the heat medium outlet of the third heat exchanger is connected to the refrigerant inlet of the first heat exchanger,

[0012] The high-temperature heat pump is connected to the refrigerant inlet and the refrigerant outlet of the third heat exchanger and is also connected to the heating system.

[0013] In a possible implementation manner, the second heat exchanger is a plate heat exchanger.

[0014] In a possible implementation manner, the third heat exchanger is a plate heat exchanger.

[0015] In a possible implementation manner, the high-temperature heat pump has a water outlet and a water return port connected to the heating system; the water outlet and the water return port of the high-temperature heat pump are connected in parallel with the refrigerant inlet and the refrigerant outlet of the second heat exchanger and then connected to the heating system.

[0016] In this implementation manner, the first heat exchanger is directly connected to the water outlet of the heat exchange unit, and the first heat exchanger is connected to the fan coil unit of the air conditioner in the place that needs to be cooled, which can ensure the cooling of the place that needs to be cooled, and at the same time supplement its heat into the geothermal water to ensure the water temperature of the recharged water. In addition, because heat can be supplemented, the residence time of the geothermal water in the heat exchange unit can be appropriately increased, or the heat exchange area can be increased, so as to ensure that more heat is extracted per unit time by the heating unit, reduce energy consumption, and has strong practicability. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the heating and cooling system based on the efficient utilization of geothermal energy provided by the embodiment of the present invention;

[0018] Description of the reference numerals:

[0019] 10. Heat exchange unit; 11. Second heat exchanger; 12. Third heat exchanger; 13. High-temperature heat pump; 20. First heat exchanger; 30. Heating system; 40. Geothermal well; 50. Fan coil unit. Detailed Embodiments

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] Please refer to Figure 1 , and now the heating and cooling system based on the efficient utilization of geothermal energy provided by the present utility model will be described.

[0022] Generally speaking, in order to maintain the water temperature of the reinjected water at a specific temperature, since the water temperature of the geothermal water is fixed and the heat exchanger is usually fixed, a relatively conventional method is to reduce the heat exchange area, that is, to reduce the size of the heat exchange surface of the heat exchanger; or to shorten the heat transfer time and increase the flow rate of the geothermal water. No matter which method is used, it is impossible to ensure that the water temperature of the geothermal water is fully extracted by the heat exchanger.

[0023] For some places that need to be cooled, the cooling mentioned here is only relative to the indoor temperature, and the temperature is lower than the room temperature. These places are usually located indoors, and the operation of the internal equipment, including the flow of people, will cause the indoor temperature to be higher than a specific temperature. Therefore, even in winter, an air-conditioning unit is required to maintain a constant temperature.

[0024] Therefore, the present utility model provides a heating and cooling system based on the efficient utilization of geothermal energy, which can mainly correspond the geothermal energy to both the heating system 30 and the places that need to be cooled. The heating and cooling system based on the efficient utilization of geothermal energy includes a heat exchange unit 10 and a first heat exchanger 20. The heat exchange unit 10 is connected to the heating system 30 and has a geothermal water inlet and a geothermal water outlet. The geothermal water inlet of the heat exchange unit 10 is connected to the outlet pipeline of the geothermal well 40. The first heat exchanger 20 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The heat medium inlet and the heat medium outlet of the first heat exchanger 20 are connected to the fan coil unit 50 in the air-conditioning unit. The refrigerant inlet of the first heat exchanger 20 is connected to the heat medium outlet of the heat exchange unit 10, and the refrigerant outlet of the first heat exchanger 20 is connected to the reinjection pipeline of the geothermal well 40.

[0025] The working principle of the heating and cooling system based on the efficient utilization of geothermal energy provided in this embodiment is that the geothermal water exported from the geothermal well 40 through the geothermal water outlet directly enters the heat exchange unit 10 and is fully heat-exchanged with the heating system 30 through the heat exchange unit 10. For example, the water temperature exported from the water outlet of the heat exchange unit 10 is 5°C. The heat-exchanged water enters the first heat exchanger 20. At this time, the medium flowing in the pipeline connecting the heat exchanger and the fan coil unit 50 is used as the heat medium, and the heat in the places that need to be cooled can be extracted into the geothermal water (supplementary heat) so that the temperature of the geothermal water exported from the refrigerant outlet of the first heat exchanger 20 is increased to 20°C.

[0026] While realizing heating in the above - mentioned manner, cooling is also carried out in special places.

[0027] For the heating and cooling system based on the efficient utilization of geothermal energy provided in this embodiment, compared with the prior art, a first heat exchanger 20 is directly connected to the water outlet of the heat exchange unit 10, and the first heat exchanger 20 is connected to the fan coil 50 of the air - conditioning unit in the place that needs cooling, which can ensure cooling of the place that needs cooling, and at the same time supplement its heat into the geothermal water to ensure the water temperature of the recharged water. In addition, because heat can be supplemented, the residence time of the geothermal water in the heat exchange unit 10 can be appropriately increased, or the heat exchange area can be increased, so as to ensure that the heating unit extracts more heat per unit time, reduce energy consumption, and has strong practicability.

[0028] It should be noted that the first heat exchanger 20 can be connected to the fan coils 50 in multiple surrounding places that need cooling at the same time.

[0029] In some embodiments, the above - mentioned first heat exchanger 20 can adopt the structure as Figure 1 shown. Refer to Figure 1 , the first heat exchanger 20 is a plate heat exchanger.

[0030] The plate heat exchanger transfers heat through the heat exchange of metal plates. It is composed of many corrugated metal plates. Narrow channels are formed between the plates, and the fluid flows in the channels for heat exchange. The plate heat exchanger has the advantages of compact structure, high heat exchange efficiency, small occupied space, convenient installation and cleaning, etc. Moreover, it is highly energy - efficient and easy to maintain, and can ensure the efficient transfer of geothermal energy.

[0031] In some embodiments, the above - mentioned heat exchange unit 10 can adopt the structure as Figure 1 shown. Refer to Figure 1 , the heat exchange unit 10 includes a second heat exchanger 11, a third heat exchanger 12 and a high - temperature heat pump 13. The second heat exchanger 11 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The heat medium inlet of the second heat exchanger 11 is connected to the water outlet pipeline of the geothermal well 40, and the refrigerant inlet and outlet of the second heat exchanger 11 are connected to the heating system 30. The third heat exchanger 12 has a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet. The heat medium inlet of the third heat exchanger 12 is connected to the heat medium outlet of the second heat exchanger 11, the heat medium outlet of the third heat exchanger 12 is connected to the refrigerant inlet of the first heat exchanger 20, the high - temperature heat pump 13 is connected to the refrigerant inlet and outlet of the third heat exchanger 12, and is also connected to the heating system 30.

[0032] The geothermal water passes through the second heat exchanger 11 and the third heat exchanger 12 in sequence, which can ensure efficient heat exchange. At the same time, before passing through the third heat exchanger 12, the temperature of the geothermal water may be lower than the return water temperature of the heating system 30. In order to continue extracting heat from the geothermal water, a high-temperature heat pump 13 is set up. The high-temperature heat pump 13 can continue to extract the heat of the geothermal water in the third heat exchanger 12 to ensure that the temperature of the geothermal water exported from the heat medium outlet of the third heat exchanger 12 is lower than the temperature in the place where cooling is required, thus avoiding the loss of geothermal energy.

[0033] It should be noted that the high-temperature heat pump 13 is a device that uses a refrigerant to absorb and release heat in a closed cycle to achieve heat transfer. It is applicable to heating and industrial heat applications and can provide high-efficiency heat energy at low ambient temperatures. Its working principle is based on a refrigeration cycle, in which the refrigerant absorbs heat in the evaporator and then is compressed in the compressor. As the pressure increases, the temperature of the refrigerant also rises. Next, the refrigerant flows into the condenser, where it releases heat to the external environment to complete the heat transfer. The high-temperature heat pump 13 is an existing technology and will not be elaborated here.

[0034] In some embodiments, the above-mentioned second heat exchanger 11 can adopt the structure as Figure 1 shown. Refer to Figure 1 , the second heat exchanger 11 is a plate heat exchanger.

[0035] The plate heat exchanger transfers heat through the heat exchange of metal plates. It is composed of many corrugated metal plates, and narrow channels are formed between the plates. Fluids flow in the channels to conduct heat exchange. The plate heat exchanger has the advantages of compact structure, high heat exchange efficiency, small occupied space, convenient installation and cleaning, etc. Moreover, it is energy-efficient and easy to maintain, and can ensure the efficient transfer of geothermal energy.

[0036] In some embodiments, the above-mentioned third heat exchanger 12 can adopt the structure as Figure 1 shown. Refer to Figure 1 , the third heat exchanger 12 is a plate heat exchanger.

[0037] The plate heat exchanger transfers heat through the heat exchange of metal plates. It is composed of many corrugated metal plates, and narrow channels are formed between the plates. Fluids flow in the channels to conduct heat exchange. The plate heat exchanger has the advantages of compact structure, high heat exchange efficiency, small occupied space, convenient installation and cleaning, etc. Moreover, it is energy-efficient and easy to maintain, and can ensure the efficient transfer of geothermal energy.

[0038] In some embodiments, the above-mentioned heat exchange unit 10 can adopt the structure as Figure 1 shown. Refer to Figure 1, the high-temperature heat pump 13 has a water outlet and a water return port connected to the heating system 30. The water outlet and the water return port of the high-temperature heat pump 13 are connected to the heating system 30 in parallel with the refrigerant inlet and the refrigerant outlet of the second heat exchanger 11.

[0039] This structure can ensure that the high-temperature heat pump 13 and the second heat exchanger 11 simultaneously correspond to the heating system 30 to ensure the heating effect.

[0040] In a preferred manner, the water outlet of the high-temperature heat pump 13 and the refrigerant outlet of the second heat exchanger 11 are both connected to the water inlet pipe of the heating system 30, while the water return port of the high-temperature heat pump 13 and the refrigerant inlet of the second heat exchanger 11 are both connected to the water return pipe of the heating system 30.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heating and cooling system based on the efficient utilization of geothermal energy, characterized in that Comprising: A heat exchange unit, connected to a heating system, having a geothermal water inlet and a geothermal water outlet; the geothermal water inlet of the heat exchange unit is connected to the outlet pipeline of a geothermal well; A first heat exchanger, having a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet and the heat medium outlet of the first heat exchanger are connected to a fan coil unit in an air-conditioning unit; the refrigerant inlet of the first heat exchanger is connected to the heat medium outlet of the heat exchange unit, and the refrigerant outlet of the first heat exchanger is connected to the reinjection pipeline of the geothermal well.

2. The heating and cooling system based on efficient utilization of geothermal energy according to claim 1, characterized in that, The first heat exchanger is a plate heat exchanger.

3. The heating and cooling system based on efficient utilization of geothermal energy according to any one of claims 1-2, characterized in that, The heat exchange unit includes: A second heat exchanger, having a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet of the second heat exchanger is connected to the outlet pipeline of the geothermal well, and the refrigerant inlet and the refrigerant outlet of the second heat exchanger are connected to the heating system; A third heat exchanger, having a heat medium inlet, a heat medium outlet, a refrigerant inlet and a refrigerant outlet; the heat medium inlet of the third heat exchanger is connected to the heat medium outlet of the second heat exchanger, and the heat medium outlet of the third heat exchanger is connected to the refrigerant inlet of the first heat exchanger, A high-temperature heat pump, connected to the refrigerant inlet and the refrigerant outlet of the third heat exchanger, and connected to the heating system.

4. The heating and cooling system based on efficient utilization of geothermal energy according to claim 3, characterized in that, The second heat exchanger is a plate heat exchanger.

5. The heating and cooling system based on efficient utilization of geothermal energy according to claim 3, characterized in that, The third heat exchanger is a plate heat exchanger.

6. The heating and cooling system based on efficient utilization of geothermal energy according to claim 3, characterized in that The high-temperature heat pump has a water outlet and a water return port connected to the heating system; the water outlet and the water return port of the high-temperature heat pump are connected in parallel with the refrigerant inlet and the refrigerant outlet of the second heat exchanger and then connected to the heating system.

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