Efficient exchange cold and heat energy storage system

Abstract

The invention discloses an efficient exchange cold and heat energy storage system, which relates to the technical field of underground heat exchangers and comprises a solar water heater, a photovoltaic system, a pump body, a ground source pump, a plurality of superconducting underground heat exchange mechanisms and a PLC (Programmable Logic Controller) control system, the solar water heater and the photovoltaic system are arranged at the top of a house, the pump body, the ground source pump and the PLC control system are arranged indoors, and the superconducting underground heat exchange mechanism is arranged underground; the solar water heater, the pump body, the ground source pump and the underground heat exchange mechanism are communicated through pipelines, and the solar water heater, the photovoltaic system, the pump body and the ground source pump are all controlled by the PLC system in a linkage mode. Hot water generated by the solar water heater is utilized, and the water pump is driven by electricity generated by photovoltaics to supplement heat of the underground heat exchange mechanism; and cold energy is stored by using the superconductive underground exchanger in summer and extracted during application.

Description

Technical Field

[0001] The invention belongs to the technical field of underground heat exchangers, and in particular relates to a high-efficiency cold and heat exchange energy storage system. Background Art

[0002] The underground heat exchanger is a key device in the ground source heat pump system. For areas where surface water and groundwater are scarce and groundwater exploitation is restricted, the underground heat exchanger is the best choice for achieving indoor temperature regulation. The pipes of the underground heat exchanger are buried in the shallow soil underground, and the circulating water directly exchanges heat with the soil through the water pipe wall. In summer, the circulating water releases the heat absorbed by the refrigeration unit to the soil, and in winter, it absorbs heat from the soil and transfers the heat to the room through the heat pump unit.

[0003] At present, the underground heat exchange system has not been fully combined with solar energy, and the buried pipes used are usually double U-tubes, which extract the heat contained in the underground soil, rocks, etc. through circulating water. This method has low heat exchange efficiency; a large number of ground source wells and buried pipes are required, the project cost is high, and it is limited by the construction site area.

[0004] Therefore, how to propose an energy storage cooling and heating system with high heat exchange efficiency and small footprint has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a high-efficiency exchange of cold and heat energy storage system. The present invention can overcome the above-mentioned shortcomings of the prior art. By arranging a solar water heater and a pump body, the temperature in the geothermal well is replenished by the solar water heater, thereby ensuring the balance of geothermal energy replenishment and effectively reducing the heating cost. Conversely, in winter, the energy storage efficiency of the cold and heat storage heat exchanger is improved.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A high-efficiency heat and cold exchange energy storage system comprises a solar water heater, a photovoltaic system, a pump body, a ground source pump, several superconducting underground heat exchange mechanisms, and a PLC control system. The solar water heater and the photovoltaic system are arranged on the roof of a house, the pump body, the ground source pump and the PLC control system are arranged indoors, the superconducting underground heat exchange mechanism is arranged below the ground, the solar water heater, the pump body, the ground source pump and the underground heat exchange mechanism are connected through pipelines, and the solar water heater, the photovoltaic system, the pump body and the ground source pump are all controlled by the PLC system in a linkage manner; when the sun is sufficient, the PLC system uses the electricity generated by photovoltaics to drive the pump body, and transmits the heat energy generated by the solar water heater to the superconducting underground exchange mechanism to compensate for the underground temperature. In summer, when the electricity price is relatively cheap, the PLC system controls the ground source pump to work, and the ground source pump works to transmit the cold energy to the superconducting underground exchange mechanism for storage underground, which can then be taken out as needed.

[0008] Furthermore, the PLC control system detects and controls the photovoltaic system and the solar water heater, and the heat energy generated by the solar water heater is transported to the water inlet of the superconducting underground heat exchange mechanism through the photovoltaic system to drive the water pump, and then flows out from the water outlet of the superconducting underground heat exchange mechanism. The heat energy entering inside and the cold energy outside the superconducting underground heat exchange mechanism produce a temperature difference, so that the heat energy inside the exchanger with superconducting properties will quickly diffuse to the outside of the exchanger, so as to achieve the purpose of replenishing heat energy to the underground, and then transport the cold energy underground to the solar water heater, heat it again, and repeat the cycle, so as to achieve the function of storing the heat energy generated by the solar energy underground, increase the overall temperature of the underground, thereby effectively reducing the heating cost and greatly reducing the heating cost.

[0009] Furthermore, the unique matching design of the superconducting underground exchangers and the superconducting materials used in several superconducting underground heat exchange mechanisms, the unique matching design is: in summer, several underground exchangers are divided into cold well areas and hot well areas, the hot well areas are used to absorb the heat energy generated by solar water heaters and ground source pumps, and because the superconducting underground exchangers have ultra-fast heat exchange efficiency, they quickly release the heat energy to the soil outside the exchangers to achieve the purpose of storing heat energy underground, thereby greatly increasing the storage of heat energy, thereby reducing the cost of heating in winter; the cold well area is used to absorb the cold energy generated by the ground source pump when the electricity price is cheap, and because the superconducting underground exchangers have ultra-fast heat exchange efficiency, they quickly release the cold energy to the soil outside the exchangers for storage, and when in use, they also use their ultra-fast heat exchange efficiency to quickly absorb and utilize, and transport the cold energy indoors to cool the indoors, thereby greatly improving the efficiency of cold energy storage and extraction, and effectively reducing the cost of cooling in summer.

[0010] Furthermore, the superconducting underground exchanger is composed of a superconducting tube and a thermal insulation tube or a low heat dissipation tube, which solves the problem of cross-interference caused by the alternating flow of hot and cold water. The superconducting tube is only responsible for releasing energy, and the thermal insulation tube or the low heat dissipation tube is only responsible for transportation, each performing its own function.

[0011] Furthermore, the outer diameter range of the superconducting pipe is: 20-50 mm, the wall thickness range is: 2-4 mm, the length range is: 60-150 meters, the thermal conductivity range is: 0.4-1w / mk, the outer diameter range of the insulation pipe is: 30-60 mm, the wall thickness range is: 10-30 mm, the length range is: 50-150 meters, the thermal conductivity range is: less than 0.4w / mk; the outer diameter range of the low heat dissipation pipe is: 20-40 mm, the wall thickness range is: 3-6 mm, the length range is: 50-150 meters, and the thermal conductivity range is: less than 0.4w / mk.

[0012] Furthermore, the superconducting tube is connected to the bottom of the thermal insulation tube or the low heat dissipation tube by a communicating vessel.

[0013] Furthermore, the superconducting tube may be one or more, the thermal insulation tube may be one, and the low heat dissipation tube may be one or more.

[0014] Furthermore, the underground heat exchange mechanism is provided with two areas, including an underground heat exchange mechanism in a first area and an underground heat exchange mechanism in a second area. In summer, the underground heat exchange mechanism in the first area is used to store cold energy, and the underground heat exchange mechanism in the second area is used to store heat energy generated by a ground source pump and heat from solar energy. In winter, both the underground heat exchange mechanism in the first area and the underground heat exchange mechanism in the second area are used to store cold energy and absorb heat energy generated by solar energy.

[0015] Furthermore, the pump body is a photovoltaic system or a 220V or 380V circulating pump body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can use the solar water heater to heat circulating water by setting up a solar water heater and a photovoltaic system. When the sun is sufficient, the heat generated by the solar water heater is used to replenish the underground temperature. The temperature sensor is set inside the solar water heater to monitor the temperature. When the temperature reaches the set value, the water pump is driven to work and the water is transported to the underground heat exchange mechanism through the connecting pipeline, thereby accelerating the energy storage efficiency of the energy storage heat exchanger. The present invention is a green energy acquisition method that can achieve zero carbon emissions;

[0018] 2. The underground heat exchange mechanism of the present invention adopts the design of setting the insulation pipe sleeve in the superconducting tube, which reduces the construction area of ​​a single underground heat exchange mechanism, reduces the project cost, and saves the construction site area. The design of the insulation layer in the insulation pipe prevents the water flowing therein from exchanging heat with the energy storage body. Such a setting can ensure that the energy storage body can store and release energy only through the superconducting tube, realize the separation of medium heat exchange, and improve the utilization rate of underground energy;

[0019] 3. The underground heat exchange mechanism of the present invention is provided with at least two groups. In summer, the underground heat exchange mechanism in the first area is used to store cold energy, and the underground heat exchange mechanism in the second area is used to store heat energy generated by ground source pumps, solar energy and energy storage tanks. In winter, the underground heat exchange mechanism in the first area and the second underground heat exchange mechanism are both used to store cold energy and absorb heat energy generated by solar energy. The layout is more reasonable and the energy utilization rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main body of the high-efficiency exchange cold and heat energy storage system in Example 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the summer operation of the high-efficiency exchange heat and cold energy storage system in Example 1 of the present invention;

[0022] Figure 3It is a cross-sectional view of the superconducting tube and the thermal insulation tube or the low heat dissipation tube in Example 2 of the present invention;

[0023] Figure 4 Schematic diagram of the arrangement of superconducting pipes and thermal insulation pipes or low heat dissipation pipes in Example 2 of the present invention Figure 1 ;

[0024] Figure 5 Schematic diagram of the arrangement of superconducting pipes and thermal insulation pipes or low heat dissipation pipes in Example 2 of the present invention Figure 2 .

[0025] Among them, 1-solar water heater; 2-photovoltaic system; 3-insulated transmission pipeline; 4-temperature sensor; 9-electric three-way valve; 10-manual valve; 26-ground source pump; 27-superconducting tube; 28-insulated pipe or low heat dissipation pipe; 29-underground connector; 30-water pump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] Reference Figure 1-2 The present embodiment discloses a high-efficiency heat and cold exchange energy storage system, comprising a solar water heater 1, a photovoltaic system 2, a ground source pump, a water pump 30, several superconducting underground heat exchange mechanisms, a temperature sensor 4 and a PLC control system (not shown in the figure). The solar water heater 1 and the photovoltaic system 2 are arranged on the roof of the house, the water pump 30 and the ground source pump 26 are arranged indoors, the PLC control system is arranged on one side of the water pump 30, and the superconducting underground heat exchange mechanism is arranged below the ground. The solar water heater 1 and the photovoltaic system 2 are connected with the indoor terminal and the underground heat exchange mechanism through an electric three-way valve 9, the ground source pump 26 and the water pump 30 and the underground heat exchange mechanism are connected through an insulated transmission pipeline 3, and a manual valve 10 is arranged on the insulated transmission pipeline 3. The solar water heater 1, the photovoltaic system 2, the water pump 30, the ground source pump 26, and the underground heat exchange mechanism are all electrically connected to the PLC control system, and a temperature sensor 4 is arranged in the solar water heater 1.

[0029] The present invention utilizes a solar water heater 1 and a photovoltaic system 2 to transport hot water to a superconducting underground heat exchange mechanism, and through the principle of superconductivity, rapidly transports heat to the surrounding area, thereby achieving the purpose of storing thermal energy in advance, thereby effectively reducing heating costs. When the sun is sufficient, the PLC system utilizes the electrical energy generated by photovoltaics to drive the pump body 30, and transports the thermal energy generated by the solar water heater to the superconducting underground exchange mechanism to replenish the underground temperature. In summer, when the electricity price is relatively cheap, the PLC system controls the operation of the ground source pump, and the ground source pump transports cold energy to the superconducting underground exchange mechanism for storage underground, which can then be taken out as needed.

[0030] When the water temperature in the solar water heater 1 reaches a set value as measured by the temperature sensor 4, the water is transported to the underground heat exchanger through the photovoltaic system 2, and heat is transported to the surrounding area through the underground heat exchanger.

[0031] As a preferred embodiment of the present invention, at least two groups of underground heat exchange mechanisms are provided, including a first-area underground heat exchange mechanism and a second-area underground heat exchange mechanism. In summer, the first-area underground heat exchange mechanism is used to store cold energy, and the second-area underground heat exchange mechanism is used to store heat energy generated by ground source pumps and solar energy; in winter, the first-area underground heat exchange mechanism and the second-area underground heat exchange mechanism are both used to store cold energy and absorb heat energy generated by solar energy.

[0032] Example 2

[0033] like Figure 3-5 As shown, this embodiment discloses a specific structure of the superconducting underground heat exchange mechanism in Example 1. The total length of the superconducting underground heat exchange mechanism is limited to between 80 and 140 m. It includes a superconducting tube 5 and a thermal insulation tube or a low heat dissipation tube, which solves the problem of cross interference generated in the process of alternating cold and hot flows. The superconducting tube is only responsible for releasing energy, and the thermal insulation tube or the low heat dissipation tube is only responsible for transportation, each of which performs its duties. A temperature control probe (not shown) is provided in the superconducting tube 5. The superconducting tube can be one or more, the thermal insulation tube is one, and the low heat dissipation tube can be one or more. The superconducting tube is connected to the thermal insulation tube or the low heat dissipation tube at the bottom by a connecting vessel.

[0034] As a preferred embodiment of the present invention, the outer diameter range of the superconducting pipe is: 20-50 mm, the wall thickness range is: 2-4 mm, the length range is: 60-150 meters, the thermal conductivity range is: 0.4-1w / mk, the outer diameter range of the insulation pipe is: 30-60 mm, the wall thickness range is: 10-30 mm, the length range is: 50-150 meters, the thermal conductivity range is: less than 0.4w / mk; the outer diameter range of the low heat dissipation pipe is: 20-40 mm, the wall thickness range is: 3-6 mm, the length range is: 50-150 meters, and the thermal conductivity range is: less than 0.4w / mk.

[0035] As a preferred embodiment of the present invention, this embodiment also includes a wellbore and an energy storage body. The wellbore is drilled on the ground and extends underground. The depth is about 60 to 120 meters. Corresponding to the sand layers of different depths, a heat-conducting waterproof layer is provided on the inner wall of the wellbore to seal the sand layer. The waterproof layer is made of bentonite or clay. The underground heat exchange mechanism is arranged in the wellbore, and the energy storage body is filled between the wellbore and the underground heat exchange mechanism. The energy storage body in this embodiment is soil.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency heat and cold exchange energy storage system, characterized in that: The invention comprises a solar water heater, a photovoltaic system, a pump body, a ground source pump, several superconducting underground heat exchange mechanisms, and a PLC control system. The solar water heater and the photovoltaic system are arranged on the roof of a house, the pump body, the ground source pump and the PLC control system are arranged indoors, the superconducting underground heat exchange mechanism is arranged below the ground, the solar water heater, the pump body, the ground source pump and the underground heat exchange mechanism are connected through pipelines, and the solar water heater, the photovoltaic system, the pump body and the ground source pump are all controlled by the PLC system in a linkage manner. When the sun is sufficient, the PLC system uses the electric energy generated by photovoltaics to drive the pump body, and transmits the heat energy generated by the solar water heater to the superconducting underground exchange mechanism to replenish the underground temperature. In summer, when the electricity price is relatively cheap, the PLC system controls the ground source pump to work, and the ground source pump works to transmit the cold energy to the superconducting underground exchange mechanism, which is stored underground and then taken out as needed.

2. A high-efficiency heat and cold exchange energy storage system according to claim 1, characterized in that: The PLC control system detects and controls the photovoltaic system and the solar water heater. The heat energy generated by the solar water heater is transported to the water inlet of the superconducting underground heat exchange mechanism through the photovoltaic system to drive the water pump, and then flows out from the water outlet of the superconducting underground heat exchange mechanism. The heat energy entering the inside and the cold energy outside the superconducting underground heat exchange mechanism produce a temperature difference. In this way, the heat energy inside the exchanger with superconducting properties will quickly diffuse to the outside of the exchanger, so as to achieve the purpose of replenishing heat energy to the underground. The cold energy underground is then transported to the solar water heater for heating again, and the reciprocating cycle is repeated to achieve the function of storing the heat energy generated by the solar energy underground, thereby increasing the overall temperature of the underground, thereby effectively reducing the heating fee and greatly reducing the heating cost.

3. The high-efficiency heat and cold exchange energy storage system according to claim 1, characterized in that: The unique matching design of the superconducting underground exchangers and the superconducting materials used in several superconducting underground heat exchange mechanisms, the unique matching design is: in summer, several underground exchangers are divided into cold well areas and hot well areas, the hot well areas are used to absorb the heat energy generated by solar water heaters and ground source pumps, and because the superconducting underground exchangers have ultra-fast heat exchange efficiency, they quickly release the heat energy to the soil outside the exchangers to achieve the purpose of storing heat energy underground, thereby greatly increasing the storage of heat energy, thereby reducing the cost of heating in winter; the cold well area is used to absorb the cold energy generated by the ground source pump when the electricity price is cheap, and because the superconducting underground exchangers have ultra-fast heat exchange efficiency, they quickly release the cold energy to the soil outside the exchangers for storage, and when in use, they also use their ultra-fast heat exchange efficiency to quickly absorb and utilize, and transport the cold energy indoors to cool the indoors, thereby greatly improving the efficiency of cold energy storage and extraction, and effectively reducing the cost of cooling in summer.

4. A high-efficiency heat and cold exchange energy storage system according to claim 3, characterized in that: The superconducting underground exchanger is composed of a superconducting tube and a thermal insulation tube or a low-heat dissipation tube, which solves the problem of cross-interference caused by the alternating flow of hot and cold water. The superconducting tube is only responsible for releasing energy, and the thermal insulation tube or the low-heat dissipation tube is only responsible for transportation, each performing its own function.

5. The high-efficiency heat and cold exchange energy storage system according to claim 4, characterized in that: The outer diameter range of superconducting pipe is: 20-50 mm, wall thickness range: 2-4 mm, length range: 60-150 meters, thermal conductivity range: 0.4-1w / mk, the outer diameter range of insulation pipe is: 30-60 mm, wall thickness range: 10-30 mm, length range: 50-150 meters, thermal conductivity range: less than 0.4w / mk; the outer diameter range of low heat dissipation pipe is: 20-40 mm, wall thickness range: 3-6 mm, length range: 50-150 meters, thermal conductivity range: less than 0.4w / mk.

6. The high-efficiency heat and cold exchange energy storage system according to claim 3 is characterized in that: The superconducting tube is connected with the bottom of the thermal insulation tube or the low heat dissipation tube by a connecting vessel.

7. The high-efficiency heat and cold exchange energy storage system according to claim 3, characterized in that: The superconducting tube may be one or more tubes, the thermal insulation tube may be one tube, and the low heat dissipation tube may be one or more tubes.

8. The high-efficiency heat and cold exchange energy storage system according to claim 1, characterized in that: The underground heat exchange mechanism is provided with two areas, including a first-area underground heat exchange mechanism and a second-area underground heat exchange mechanism. In summer, the first-area underground heat exchange mechanism is used to store cold energy, and the second-area underground heat exchange mechanism is used to store heat energy generated by a ground source pump and heat from solar energy. In winter, the first-area underground heat exchange mechanism and the second-area underground heat exchange mechanism are both used to store cold energy and absorb heat energy generated by solar energy.

9. The high-efficiency heat and cold exchange energy storage system according to claim 1, characterized in that: The pump body is a photovoltaic system or a 220V or 380V circulation pump body.

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