CN213777871U - Season-crossing energy storage heating system using renewable energy - Google Patents
Season-crossing energy storage heating system using renewable energy Download PDFInfo
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- CN213777871U CN213777871U CN202023063674.6U CN202023063674U CN213777871U CN 213777871 U CN213777871 U CN 213777871U CN 202023063674 U CN202023063674 U CN 202023063674U CN 213777871 U CN213777871 U CN 213777871U
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Abstract
The utility model provides a renewable energy stride season energy storage heating system, belong to heating technical field, including underground heat transfer device, the ground source heat pump, user heat transfer device and fused salt heat-retaining device, underground heat transfer device buries underground be used for with the heat carry out the heat transfer in the underground soil, the ground source heat pump is used for extracting the underground heat and carries to the user side when winter, be used for carrying the heat to the underground from the user side when summer, user heat transfer device communicates with the ground source heat pump respectively, be used for and with the heat regional heat transfer of heat consumption, fused salt heat-retaining device is used for the heat-retaining and supplies heat to user heat transfer device, underground heat transfer device, the ground source heat pump, circulating heat supply return circuit is constituteed to fused salt heat-retaining device and user heat transfer device. The utility model discloses a renewable energy stride season energy storage heating system can maintain underground soil in the heat is in balanced interval, winter for the user side heating, and heat energy replenishment volume is sufficient, summer to the secret heat-retaining, realizes striding season energy storage heating, cyclic utilization, the energy can be saved to geothermal energy.
Description
Technical Field
The utility model belongs to the technical field of geothermal heating, more specifically say, relate to a renewable energy source strides season energy storage heating system.
Background
Renewable energy sources are energy sources from nature, such as solar energy, wind power, tidal energy, geothermal energy and the like, are inexhaustible energy sources, are relatively inexhaustible energy sources, are harmless or minimally harmful to the environment, are widely distributed, and are suitable for on-site development and utilization. Geothermal energy refers to a source of thermal energy from the earth's interior. The earth in which people live is a huge heat reservoir, and the heat storage capacity reaches 1.05 multiplied by 10 only by one layer with the thickness of 10 kilometers underground26Joule, equivalent to 3.58X 1015Ton of heat released from standard coal. The geothermal energy is stored in the evolution process, is another natural energy source independent of solar energy, is not influenced by condition factors such as weather conditions and the like, and has a great future development potential.
In the prior art, there are devices for exploiting geothermal energy, such as a ground source heat pump unit, which extract heat in underground soil to the ground through the ground source heat pump unit, and then utilize the geothermal energy, such as heating indoor in winter, heating and the like, the ground source heat pump only extracts geothermal energy in winter, and releases heat to the underground very little, i.e. stores energy, which will result in unbalance of the underground heat energy and reduction of the supply of the geothermal energy for a long time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a renewable energy strides season energy storage heating system aims at solving and adopts the ground source heat pump exploitation geothermal energy to heat winter, leads to the unbalanced technical problem of underground heat energy easily.
In order to achieve the above object, the utility model adopts the following technical scheme: the renewable energy season-spanning energy storage heating system comprises an underground heat exchange device, a ground source heat pump, a user heat exchange device and a molten salt heat storage device, wherein the underground heat exchange device is buried underground, and a heat exchange medium circulates inside the underground heat exchange device and is used for exchanging heat with heat in underground soil; the ground source heat pump is communicated with the underground heat exchange device, is used for extracting underground heat and conveying the underground heat to a user side in winter, and is used for conveying the heat to the underground from the user side in summer, and the water outlet temperature of the ground source heat pump is greater than the water return temperature; the system comprises a plurality of user heat exchange devices, a ground source heat pump and a ground source heat pump, wherein the user heat exchange devices are arranged at user ends respectively and are communicated with the ground source heat pump respectively, the user heat exchange devices are used for radiating underground heat extracted by the ground source heat pump in winter and used for collecting heat in a heat utilization area in summer, and the heat in summer is pumped to the underground heat exchange devices through the ground source heat pump; the output end of the fused salt heat storage device is connected with the input end of the user heat exchange device and used for storing heat and supplying heat to the user heat exchange device; the underground heat exchange device, the ground source heat pump, the molten salt heat storage device and the user heat exchange device form a circulating heat supply loop, geothermal energy is extracted from the underground in winter and heat is exchanged to supply heat for a user side, and heat is extracted from the user side in summer and heat is exchanged to store heat for the underground, so that the balance of the underground heat energy is maintained.
As another embodiment of this application, fused salt heat-retaining device with communicate through heat storage pipeline between the user heat transfer device be equipped with the level pressure device on the heat storage pipeline, the level pressure device be used for to supply water to pressurize in the user heat transfer device.
As another embodiment of this application, the ground source heat pump with communicate through many geothermol power pipelines between the underground heat transfer device, underground heat transfer device buries underground in the shallow layer for with shallow geothermal heat transfer, underground heat transfer device includes that the multiunit is the heat exchange tube of U type, multiunit end to end intercommunication each other between the heat exchange tube forms the serial structure, the multiunit the heat exchange tube all is located same horizontal plane.
As another embodiment of this application, a renewable energy source strides season energy storage heating system still including locating molten salt heat-retaining device with air source heat pump unit between the user heat transfer device, winter the air source heat pump unit be used for heating and to input heat in the user heat transfer device, air source heat pump unit can refrigerate.
As another embodiment of the present application, a renewable energy season-spanning energy storage heating system further includes an electromagnetic heating device disposed between the output end of the air source heat pump unit and the input end of the user heat exchange device, the electromagnetic heating device is used for heating and transporting heat to the user heat exchange device, and the heating temperature of the electromagnetic heating device is controllable.
As another embodiment of the present application, the user heat exchange device includes a fan coil heat exchanger and a heat collector, the fan coil heat exchanger is internally circulated with a heat exchange medium and connected to the output end of the ground source heat pump, and the fan coil heat exchanger is used for exchanging heat with a heat utilization area; the heat collector is internally circulated with a heat exchange medium, one end of the heat collector is communicated with the output end of the fan coil heat exchanger, the other end of the heat collector is communicated with the input end of the ground source heat pump, the heat collector is used for collecting heat in a heat utilization area and conveying the heat to the ground source heat pump, and the heat collector is a tube sheet type heat collector.
As another embodiment of this application, fused salt heat-retaining device opens and the heat-retaining at night, is used for doing daytime user heat transfer device heat supply, fused salt heat-retaining device electric connection has the controller, and opening time is controlled by the controller, be equipped with timing module on the controller, through setting up timing module is steerable fused salt heat-retaining device, fused salt heat-retaining device's the setting position is adjustable.
As another embodiment of the present application, the input end and the output end of the ground source heat pump are respectively provided with a water collecting and distributing device, and the water collecting and distributing device is used for conveying heat to the user heat exchange devices and the underground heat exchange devices in parallel.
As another embodiment of the present application, the air source heat pump unit is turned on when the heat supply of the ground source heat pump is insufficient, and the electromagnetic heating device is turned on when both the heat supply of the air source heat pump unit and the heat supply of the ground source heat pump are insufficient; control valves, temperature sensors and pressure sensors are arranged on pipelines between the ground source heat pump and the molten salt heat storage device, between the molten salt heat storage device and the air source heat pump unit, between the air source heat pump unit and the electromagnetic heating device and between the electromagnetic heating device and the user heat exchange device.
As another embodiment of the present application, the electromagnetic heating device is an encircling pipe type electromagnetic heater, and is used for encircling the air source heat pump unit and the pipeline between the user heat exchange devices, and can heat uniformly.
The utility model provides a pair of renewable energy strides season energy storage heating system's beneficial effect lies in:
compared with the prior art, the utility model relates to a renewable energy source season-spanning energy storage heating system, which comprises an underground heat exchange device, a ground source heat pump, a user heat exchange device and a fused salt heat storage device, wherein the underground heat exchange device is buried underground, and a heat exchange medium circulates inside the underground heat exchange device and is used for exchanging heat with heat in underground soil; the ground source heat pump is communicated with the underground heat exchange device, is used for extracting underground heat and conveying the underground heat to a user side in winter, and is used for conveying the heat to the underground from the user side in summer, and the water outlet temperature of the ground source heat pump is greater than the water return temperature; the system comprises a plurality of user heat exchange devices, a ground source heat pump, a heat pump heat exchanger and a heat pump, wherein the user heat exchange devices are arranged at each user end respectively and are communicated with the ground source heat pump respectively, the user heat exchange devices are used for radiating underground heat extracted by the ground source heat pump in winter and used for collecting heat in a heat utilization area in summer, and the heat in summer is pumped to the underground heat exchange devices through the ground source heat pump; the output end of the fused salt heat storage device is connected with the input end of the user heat exchange device and used for storing heat and supplying heat to the user heat exchange device; the underground heat exchange device, the ground source heat pump, the fused salt heat storage device and the user heat exchange device form a circulating heat supply loop, geothermal energy is extracted from the underground in winter and heat is exchanged to supply heat for a user side, and heat is extracted from the user side in summer and heat is exchanged to store heat for the underground, so that the underground heat energy balance is maintained. The utility model provides an adopt ground source heat pump exploitation geothermal energy to heat winter, lead to the unbalanced technical problem of underground heat energy easily, have and can maintain in the underground soil heat in balanced interval, winter is the user side heating, and heat energy replenishment is sufficient, summer to the secret heat-retaining, realizes the season energy storage heating of striding to geothermal energy, recycles, the technological effect of the energy can be saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a renewable energy season-crossing energy storage heating system according to an embodiment of the present invention (in the figure, a dotted line below the ground represents low-temperature heat).
In the figure: 1. an underground heat exchange device; 2. a ground source heat pump; 3. a user heat exchange device; 4. a molten salt heat storage device; 5. a heat storage pipeline; 6. a geothermal pipe; 7. an air source heat pump unit; 8. an electromagnetic heating device; 9. a water collecting and distributing device.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a renewable energy season-crossing energy storage heating system provided by the present invention will now be described. The renewable energy season-crossing energy storage heating system comprises an underground heat exchange device 1, a ground source heat pump 2, a user heat exchange device 3 and a molten salt heat storage device 4, wherein the underground heat exchange device 1 is buried underground, and a heat exchange medium circulates inside the underground heat exchange device and is used for exchanging heat with heat in underground soil; the ground source heat pump 2 is communicated with the underground heat exchange device 1, is used for extracting underground heat and conveying the underground heat to a user side in winter, and is used for conveying the heat to the underground from the user side in summer, and the water outlet temperature of the ground source heat pump 2 is greater than the return water temperature; the plurality of user heat exchange devices 3 are respectively arranged at each user side, are respectively communicated with the ground source heat pump 2, are used for radiating the underground heat extracted by the ground source heat pump 2 in winter and collecting the heat in a heat utilization area in summer, and pump the heat in summer to the underground heat exchange device 1 through the ground source heat pump 2; the output end of the fused salt heat storage device 4 is connected with the input end of the user heat exchange device 3 and is used for storing heat and supplying heat to the user heat exchange device 3; the underground heat exchange device 1, the ground source heat pump 2, the molten salt heat storage device 4 and the user heat exchange device 3 form a circulating heat supply loop, geothermal energy is extracted from the underground in winter and heat is exchanged to supply heat for a user side, and heat is extracted from the user side in summer and heat is exchanged to store heat for the underground, so that the balance of the underground heat energy is maintained.
Compared with the prior art, the renewable energy season-crossing energy storage and heating system provided by the utility model comprises an underground heat exchange device 1, a ground source heat pump 2, a user heat exchange device 3 and a fused salt heat storage device 4, wherein the underground heat exchange device 1 is buried underground, and a heat exchange medium circulates inside for exchanging heat with heat in underground soil; the ground source heat pump 2 is communicated with the underground heat exchange device 1, is used for extracting underground heat and conveying the underground heat to a user side in winter, and is used for conveying the heat to the underground from the user side in summer, and the water outlet temperature of the ground source heat pump 2 is greater than the return water temperature; the plurality of user heat exchange devices 3 are respectively arranged at each user side, are respectively communicated with the ground source heat pump 2, are used for radiating the underground heat extracted by the ground source heat pump 2 in winter and collecting the heat in a heat utilization area in summer, and pump the heat in summer to the underground heat exchange device 1 through the ground source heat pump 2; the output end of the fused salt heat storage device 4 is connected with the input end of the user heat exchange device 3 and is used for storing heat and supplying heat to the user heat exchange device 3; the underground heat exchange device 1, the ground source heat pump 2, the molten salt heat storage device 4 and the user heat exchange device 3 form a circulating heat supply loop, geothermal energy is extracted from the underground in winter and heat is exchanged to supply heat for a user side, and heat is extracted from the user side in summer and heat is exchanged to store heat for the underground, so that the balance of the underground heat energy is maintained. The utility model provides an adopt 2 exploitation geothermal energies of earth source heat pump to heat winter, lead to the unbalanced technical problem of underground heat energy easily, have and can maintain in the underground soil heat in balanced interval, winter is the user side heating, and heat energy replenishment is sufficient, summer to the underground heat-retaining, realizes the season energy storage heating of striding to geothermal energy, recycles, the technological effect of the energy can be saved.
The utility model discloses mainly be for each heat supply regional heat supply of using in the building, including computer lab, dormitory building, office building, research and development center etc. lay in each heat area through the pipe network, realize the heat supply to each heat area, except arranging the pipe network, this heating system still includes circuit, control system, distribution system, circulating pump etc. the setting of above each device is the arranging of the conventional device after using ground source heat pump 2 among the prior art, arranges that the position can adopt the conventionality to arrange the position and sets up, no longer gives unnecessary details here. The arrangement and construction of the pipe network, the water supply and drainage, the pump, the heating equipment and the ground source heat pump 2 system are all constructed by referring to the relevant design specifications of the international standard. When the user heat exchange devices 3 are arranged, the arrangement needs to be carried out according to the heating area of users, and the arrangement quantity needs to be matched with the area of the region.
Taking underground soil as a huge heat accumulator, storing heat energy discharged in the refrigerating process into the soil through an underground heat exchange device 1 (buried pipe) when refrigerating in summer, wherein the temperature of the underground soil presents a temperature gradient difference of 10-12 ℃ from shallow to deep, extracting 2-3 ℃ heat energy each time in winter to prepare 45-65 ℃ heat supply through a ground source heat pump 2 unit, and recovering the underground temperature to 10-12 ℃ after the heat supply is finished; in summer of the next year, the temperature is extracted and directly cooled through a user heat exchange device 3 (a water-cooling air disc), and meanwhile heat is injected to prepare for heating in winter, so that a system cold-heat balance system is kept, energy recycling is realized, namely the system is hot in summer and is used in winter, and is warm in winter and cool in summer.
The system is designed with one investment, two requirements of heating and refrigerating are met, cold and heat balance circulating energy and long-acting season-crossing energy storage are adopted, energy is recycled, the energy utilization efficiency is greatly improved, and the system is low-carbon, environment-friendly, economical and practical. Adopts renewable clean energy, and has no emission and pollution. And an intelligent operation strategy is adopted, so that the system is maintenance-free, more energy-saving, more economical and more worry-free. Adopt intelligent terminal, greatly promote body and feel comfort level.
After the cross-season energy storage heating system is used, the indoor temperature of the dormitory building in the winter heating period is above 20 ℃, and the indoor temperature in the summer is 25-28 ℃.
When the ground source heat pump 2 heats, heat is extracted from the underground soil heat storage system, and the temperature is raised to the temperature required by heat supply and is output to an indoor heat dissipation terminal. When refrigerating, if the underground cold quantity is insufficient, the heat quantity in the indoor air can be extracted.
The molten salt heat storage device 4 comprises a molten salt storage tank and a heater, and molten salt in the molten salt storage tank can store heat after being heated and then release heat to provide heat. The molten salt is a flowable liquid, is widely applied to production processes of ionic membrane caustic soda, KOH, melamine, aluminum oxide and the like in chemical industry and smelting industry as a heat transfer medium, and is increasingly applied to solar photo-thermal power generation systems in recent years due to the advantages of low price, large use temperature area, high specific heat capacity, good heat exchange performance and the like. The service temperature of the molten salt is 200-1000 ℃, the molten salt is heated by the heater, the molten salt is melted to store heat, when heat release is needed, the heater is turned off, the molten salt cannot continuously absorb the heat, the temperature is reduced and the molten salt is solidified, the heat is released in the solidification process, the oil pipe is inserted into the molten salt, the circulating oil takes the oil as a medium to transfer the heat to the water tank outside the heat storage device, the water tank is heated, and the circulating water in the water tank transfers the heat out for the use of the heat exchange device 3 (such as heating and the like) of a user.
As the utility model provides a pair of renewable energy strides a detailed implementation of season energy storage heating system please refer to fig. 1, through the 5 intercommunications of heat storage pipeline between fused salt heat-retaining device 4 and the user heat transfer device 3, is equipped with the level pressure device on heat storage pipeline 5, and the level pressure device is used for supplying water to the pressurization in the user heat transfer device 3. The heat storage pipeline 5 has a valve for controlling the on/off of the heat storage pipeline 5.
Specifically, the constant pressure device is used as a pressure-stabilizing expansion water-supplementing device in a heating and air-conditioning system, and is generally called as a bag-type floor-type expansion water tank; for ensuring the water flow in the heat storage pipeline 5 to be stable pressure.
As a specific implementation of the pair of renewable energy season-crossing energy storage heating system, please refer to fig. 1, connect through many geothermal pipelines 6 between ground source heat pump 2 and the underground heat exchange device 1, underground heat exchange device 1 is buried underground in the shallow layer for with shallow geothermal heat transfer, underground heat exchange device 1 includes that the multiunit is the heat exchange tube of U type, end to end intercommunication each other between the multiunit heat exchange tube forms the serial structure, the multiunit heat exchange tube all is located same horizontal plane.
Specifically, the heat exchange tubes are required to have the factors of using area, geographical environment and the like, the arrangement depth is generally below 1.5 meters below the ground surface, the arrangement vertical depth is 27-31 meters, water flows in the heat exchange tubes and performs closed heat exchange circulation with the ground source heat pump 2, the underground soil without heat storage (primary system) can provide the temperature of about 12 ℃, the temperature of the part is reduced to about 5 ℃ after the water flowing in the U-shaped heat exchange tubes in a closed manner is extracted by the evaporation end of the ground source heat pump 2, and the temperature is increased to about 7-9 ℃ again after the water passes through the U-shaped heat exchange tubes with the length of thousands of meters. The process circularly provides a heat source for the ground source heat pump 2.
When the system provides refrigeration in summer, the temperature of 12 ℃ in the soil is directly transferred to the user heat exchange device 3 (a fan coil radiator) through water in the U-shaped heat exchange tube to exchange with indoor hot air. The temperature of water in the U-shaped heat exchange tube in the closed circulation is increased while the room temperature is reduced, and the water exchanges heat with underground soil through the wall of the U-shaped heat exchange tube so as to increase the temperature of the soil and provide a high-quality heat source for heat supply in winter.
As the utility model provides a pair of renewable energy strides a detailed implementation of season energy storage heating system please refer to fig. 1, a renewable energy strides season energy storage heating system still including locating air source heat pump set 7 between fused salt heat-retaining device 4 and the user heat transfer device 3, and air source heat pump set 7 is used for heating and to the input heat in the user heat transfer device 3 winter time-space, belongs to supplementary heat supply, and air source heat pump set 7 can refrigerate. The air source heat pump unit 7 can adopt the prior art device, and the connection mode and the operation principle are the same as the prior art, and are not described in detail herein.
The air source heat pump unit 7 can be arranged in each heat utilization area, the input power of the air source heat pump unit 7 is 10 kilowatts, and the heating capacity is 31.5 kilowatts.
The model of the ground source heat pump 2 unit is VHXW03021NGA (RN-WSHP-030121 WM), and the model of the air source heat pump 7 unit is RN 041-138/142.
The air source heat pump unit 7 is used as a device for supplementing heat for the ground source heat pump 2, the system adopts two units with heating capacity of 141kw and 26.5kw respectively, and the total heating capacity is 167.5 kw.
As the utility model provides a pair of renewable energy strides a detailed implementation mode of season energy storage heating system please refer to and show fig. 1, a renewable energy strides season energy storage heating system still including locating the electromagnetic heating device 8 between air source heat pump set 7's the output and user heat transfer device 3's the input, electromagnetic heating device 8 is used for heating and to carrying the heat in the user heat transfer device 3, electromagnetic heating device 8's heating temperature is steerable. Be equipped with the heater strip in the electromagnetic heating device 8, can produce the heat after the circular telegram, can be with the water heating in the pipeline to the effect of user side heating temperature improvement has been realized. The heating temperature of the electromagnetic heating device 8 can be adjusted and controlled, and can be realized manually or automatically.
The electromagnetic heating device 8 is used as an auxiliary heating source, and is automatically started when the heat supplied by the ground source heat pump 2 and the air source heat pump unit 7 is insufficient, and the total installed heating capacity is 5 kw.
As a specific implementation manner of the renewable energy season-crossing energy storage heating system provided by the utility model, please refer to fig. 1, the user heat exchange device 3 includes a fan coil heat exchanger and a heat collector, a heat exchange medium flows through the fan coil heat exchanger and is connected with the output end of the ground source heat pump 2, and the fan coil heat exchanger is used for exchanging heat with the heat utilization area; the heat collector is internally circulated with a heat exchange medium, one end of the heat collector is communicated with the output end of the fan coil heat exchanger, the other end of the heat collector is communicated with the input end of the ground source heat pump 2, the heat collector is used for collecting heat in a heat utilization area and conveying the heat to the ground source heat pump 2, and the heat collector is a tube-fin type heat collector. When the fan coil heat exchanger is used, a heat collector is not used, the fan coil heat exchanger and the heat collector can be used separately or combined together, the fan coil heat exchanger and the heat collector are connected in series, water firstly passes through the fan coil heat exchanger and then passes through the heat collector, a heat collecting film covers the heat collector, heat can be well absorbed, the heat collector can be placed outdoors or closed, heat exchange and heat collection are carried out only through the fan coil heat exchanger, and then the heat is output to the ground source heat pump 2.
Specifically, after the air source heat pump unit 7 is connected to the ground source heat pump 2, the input end of the fan coil heat exchanger is connected to the output end of the air source heat pump unit 7, and the output end of the heat collector is connected to the input end of the ground source heat pump 2.
As the utility model provides a pair of renewable energy strides season energy storage heating system's a specific implementation mode, please refer to fig. 1, fused salt heat-retaining device 4 is opened and the heat-retaining at night, is used for the heat supply for user heat transfer device 3 daytime, and fused salt heat-retaining device 4 electric connection has the controller, and opening time is controlled by the controller, is equipped with timing module on the controller, through setting up the steerable fused salt heat-retaining device 4 of timing module, and fused salt heat-retaining device 4 sets up the adjustable position. The molten salt heat storage device 4 heats molten salt by utilizing the night off-peak electricity, and the cost of the night off-peak electricity is lower, so that the cost can be saved.
Specifically, the bottom of the fused salt heat storage device 4 is provided with the vehicle body, and the vehicle body is movable, so that the fused salt heat storage device 4 can be pushed to move, or the fused salt heat storage device 4 can be arranged outdoors or indoors according to different conditions, and the device is flexible to move and convenient for users to use.
As a specific implementation manner of the renewable energy season-crossing energy storage heating system provided by the utility model, please refer to fig. 1, the input and the output of the ground source heat pump 2 are respectively provided with the water collecting and distributing device 9, and the heat is conveyed to the plurality of user heat exchanging devices 3 and the underground heat exchanging device 1 in parallel through the water collecting and distributing device 9. In specific construction, the existing water collecting and separating device 9 can be adopted to collect and separate heat.
The water collecting and distributing device 9 or the water collecting and distributing device refers to a device which is used for connecting a main heating water supply pipe and a water return pipe in a floor heating system. The water separator is divided into a water separator and a water collector. The water distributor is a water distribution device which is used for connecting water supply pipes of heating pipes in a water system. The water collector is a water collecting device which is arranged in a water system and is used for connecting water return pipes of heating pipes. The water distributor-collector consists of a water distributing main pipe and a water collecting main pipe, wherein the water distributing main pipe is connected with a water supply pipe of a pipe network system and is mainly used for distributing hot water from the pipe network system to each room needing floor heating through a ground heating pipe buried under the floor. When the hot water flows in the ground heating pipe, the heat is transferred to the floor, and then the heat is radiated and transferred to the indoor through the floor.
As a specific embodiment of the renewable energy season-crossing energy storage heating system provided by the present invention, please refer to fig. 1, when the heat supply of the ground source heat pump 2 is insufficient, the air source heat pump unit 7 is turned on, and when the heat supply of the air source heat pump unit 7 and the heat supply of the ground source heat pump 2 are both insufficient, the electromagnetic heating device 8 is turned on; control valves, temperature sensors and pressure sensors are arranged on pipelines between the ground source heat pump 2 and the molten salt heat storage device 4, between the molten salt heat storage device 4 and the air source heat pump unit 7, between the air source heat pump unit 7 and the electromagnetic heating device 8 and between the electromagnetic heating device 8 and the user heat exchange device 3. The control valve, the temperature sensor and the pressure sensor have respective functions and are arranged on the pipeline, so that the flow of heat can be well controlled, and the heat supply is better for end heating.
As the utility model provides a pair of renewable energy strides a detailed implementation of season energy storage heating system please refer to fig. 1, electromagnetic heating device 8 is for embracing tubular electromagnetic heater for encircle on the pipeline between air source heat pump set 7 and the user heat transfer device 3, and can the even heating.
Solar energy is unevenly distributed all the year round, and the total irradiation amount in winter only accounts for about 20% of the whole year, so people always expect that heat in spring, summer and autumn can be used for heating in winter, so that heating is cheaper, and energy is cleaner. The solar cross-season heat storage and heating technology is similar to the cold storage technology, and only the stored heat is not cold.
The cross-season heat storage heating is to store solar energy in spring, summer and autumn, is used for large-scale regional centralized heating and hot water supply in winter, and is the most advanced solar centralized heating new mode at home and abroad. The cross-season heat storage and heating mode has four modes, the most common heat storage mode is water heat storage and soil heat storage, and different modes can be adopted for heat storage according to different actual conditions. Solar energy is used as one of the cheapest and most abundant clean energy, cross-season heat storage heating realized by utilizing the solar energy is economical and environment-friendly, the installation is simple, the solar energy can be continuously used for 25 years, and the solar energy is very suitable for regional heat supply. The cross-season energy storage constant temperature system integrates heating and refrigerating technologies, once invests, meets two requirements of heating and refrigerating, adopts cold and heat balance circulating energy and long-acting cross-season energy storage, recycles energy, greatly improves energy utilization efficiency, and is low-carbon, environment-friendly, economical and practical; the renewable clean energy is adopted, so that no emission and no pollution are caused; an intelligent operation strategy is adopted, so that the system is unattended, free of maintenance, energy-saving, economical and worry-saving; adopt intelligent terminal, greatly promote body and feel comfort level.
The solar long-term heat storage system using soil for heat storage has the advantages of large heat storage capacity and small heat loss, and can store the heat obtained by the solar heat collector in the soil to meet the building heating requirement. Economic analysis shows that the annual cost of the soil heat storage solar heating system is only about 1/3 of the electric heating system and is about 2/3 of the conventional solar heating system. Therefore, underground soil heat storage is considered one of the most promising ways of storing heat across seasons, in the long term. The soil heat storage system is characterized in that a plurality of concentric sleeves or U-shaped pipes which are vertically arranged are buried underground. Practice shows that the soil heat storage efficiency can reach over 75 percent, and the method is the seasonal heat storage mode with the lowest cost at present.
Solar heat in spring, summer and autumn is stored in underground soil for heating in winter, so that low-energy-consumption coal-free clean heating is realized. According to technical specifications of solar heating engineering (GB 50495-2009), the method has the most feasibility and popularization value for solar seasonal heat storage and soil heat storage. The solar cross-season soil heat storage system is composed of a solar heat collection subsystem, a cross-season soil heat storage subsystem and a heat pump heating subsystem 3. The soil heat storage usually uses shallow soil with the thickness of more than 120m as a heat storage body, a buried pipe heat exchange pipe is buried through well digging, circulating water is led in the pipe to conduct heat through the pipe wall to heat or cool the soil, and therefore heat storage and heat extraction are achieved. Compared with pool type heat storage, the soil heat storage temperature is relatively low, so that a heat pump is required to increase the water supply temperature during heat supply so as to meet the requirement of end heating; the number and the depth of the wells can be changed by soil heat storage according to the terminal heat load, so that the size of the wells can be changed, the wells can be used for centralized heating of areas, distributed heating can also be used, and in addition, because the temperature of the soil is relatively stable by about 15-20 ℃, the indoor refrigeration requirement in summer can be considered in hot and cold winter areas. The soil heat storage has the advantages of cheap heat storage materials, large heat storage potential, small heat loss, no environmental pollution and the like.
A series research project of a ground source season-crossing energy storage constant temperature system is combined with the specific situation of a project implementation place, a soil heat storage system is used as a main body, and an air source heat pump, a composite valley electricity fused salt energy storage slow release technology and the like are matched to realize a multi-energy complementary and cold-heat integrated system. The soil heat storage exchanges heat with the soil through the U-shaped guide pipe, and the cold is taken in summer and the heat is stored in winter. Taking underground soil as a huge heat accumulator, storing heat energy discharged in the refrigerating process into the soil through an underground pipe when refrigerating in summer, wherein the temperature of the underground soil presents a temperature gradient difference of 14-17 ℃ from shallow to deep, extracting heat energy of 2-3 ℃ each time in winter, preparing heat supply at 50-60 ℃ through a heat pump unit, and recovering the underground temperature to 10-12 ℃ after the heat supply is finished; in summer of the next year, the temperature is extracted and directly cooled through a water-cooling air disc, and heat is injected to prepare for heating in winter, so that a system with balanced cold and heat is kept.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A renewable energy cross-season energy storage heating system is characterized by comprising:
the underground heat exchange device is buried underground, and a heat exchange medium circulates in the underground heat exchange device and is used for exchanging heat with heat in underground soil;
the ground source heat pump is communicated with the underground heat exchange device, is used for extracting underground heat and conveying the underground heat to a user side in winter, and is used for conveying the heat to the underground from the user side in summer, and the water outlet temperature of the ground source heat pump is greater than the water return temperature;
the plurality of user heat exchange devices are respectively arranged at each user side, are respectively communicated with the ground source heat pump, are used for radiating the underground heat extracted by the ground source heat pump in winter and collecting the heat in a heat utilization area in summer, and pump the heat in summer to the underground heat exchange device through the ground source heat pump; and
the output end of the fused salt heat storage device is connected with the input end of the user heat exchange device and is used for storing heat and supplying heat to the user heat exchange device;
the underground heat exchange device, the ground source heat pump, the molten salt heat storage device and the user heat exchange device form a circulating heat supply loop, geothermal energy is extracted from the underground in winter and heat is exchanged to supply heat for a user side, and heat is extracted from the user side in summer and heat is exchanged to store heat for the underground, so that the balance of the underground heat energy is maintained.
2. The system of claim 1, wherein the molten salt heat storage device is communicated with the user heat exchange device through a heat storage pipeline, and a constant pressure device is arranged on the heat storage pipeline and used for supplying water to the user heat exchange device in a pressurized manner.
3. The system as claimed in claim 1, wherein the ground source heat pump is connected to the underground heat exchanger via a plurality of geothermal pipes, the underground heat exchanger is buried in a shallow layer of the ground for exchanging heat with the shallow layer of the ground, the underground heat exchanger comprises a plurality of U-shaped heat exchange pipes, the plurality of heat exchange pipes are connected end to form a series structure, and the plurality of heat exchange pipes are all located on the same horizontal plane.
4. The system of claim 1, further comprising an air source heat pump unit disposed between the molten salt heat storage device and the user heat exchange device, wherein the air source heat pump unit is configured to heat and input heat into the user heat exchange device in winter, and the air source heat pump unit is configured to cool.
5. The system of claim 4, further comprising an electromagnetic heating device disposed between the output of the air-source heat pump unit and the input of the user heat exchange device, wherein the electromagnetic heating device is used for heating and transferring heat to the user heat exchange device, and the heating temperature of the electromagnetic heating device is controllable.
6. The system of claim 1, wherein the user heat exchanger comprises:
the fan coil heat exchanger is internally circulated with a heat exchange medium and is connected with the output end of the ground source heat pump, and the fan coil heat exchanger is used for exchanging heat with a heat utilization area; and
the heat collector is internally circulated with a heat exchange medium, one end of the heat collector is communicated with the output end of the fan coil heat exchanger, the other end of the heat collector is communicated with the input end of the ground source heat pump, the heat collector is used for collecting heat in a heat utilization area and conveying the heat to the ground source heat pump, and the heat collector is a tube sheet type heat collector.
7. The system of claim 1, wherein the molten salt heat storage device is turned on at night and stores heat, and is used for supplying heat to the user heat exchange device in the daytime, the molten salt heat storage device is electrically connected with a controller, the turning-on time is controlled by the controller, a timing module is arranged on the controller, the molten salt heat storage device can be controlled by the timing module, and the setting position of the molten salt heat storage device can be adjusted.
8. The system of claim 1, wherein the input and output ends of the geothermal heat pump are respectively provided with a water collecting and distributing device, and the water collecting and distributing device is used for conveying heat to the user heat exchange devices and the underground heat exchange devices in parallel.
9. The system of claim 5, wherein the air source heat pump unit is turned on when the ground source heat pump is not supplying enough heat, and the electromagnetic heating device is turned on when both the air source heat pump unit and the ground source heat pump are not supplying enough heat;
control valves, temperature sensors and pressure sensors are arranged on pipelines between the ground source heat pump and the molten salt heat storage device, between the molten salt heat storage device and the air source heat pump unit, between the air source heat pump unit and the electromagnetic heating device and between the electromagnetic heating device and the user heat exchange device.
10. The system of claim 5, wherein the electromagnetic heating device is a tubular electromagnetic heater for surrounding a pipe between the air source heat pump unit and the user heat exchanger, and the heating device can heat the pipe uniformly.
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