CN112013448A - Phase change box and solar energy directional water inlet and outlet step phase change heat storage device - Google Patents
Phase change box and solar energy directional water inlet and outlet step phase change heat storage device Download PDFInfo
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- CN112013448A CN112013448A CN202010694271.7A CN202010694271A CN112013448A CN 112013448 A CN112013448 A CN 112013448A CN 202010694271 A CN202010694271 A CN 202010694271A CN 112013448 A CN112013448 A CN 112013448A
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- water
- phase change
- heat storage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/40—Arrangements for controlling solar heat collectors responsive to temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/10—Arrangements for storing heat collected by solar heat collectors using latent heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
A solar energy directional water inlet and outlet step phase change heat storage device comprises a solar heat collector, a heat storage water tank, a phase change box, a first temperature sensor and a controller, wherein the solar heat collector is used for providing water with different temperatures; one end of the heat storage water tank is connected with a water supply end of the solar heat collector, and the other end of the heat storage water tank is connected with a water return end of the solar heat collector; the phase change box is arranged in the heat storage water tank and comprises a plurality of phase change layers, each phase change layer is used for storing the heat of water with different temperatures provided by the water supply end of the solar heat collector in a classified manner, and after the water supply end of the solar heat collector stops supplying water at night, each phase change layer performs phase change heat exchange on the stored heat and the water in the heat storage water tank, so that the water stratification in the heat storage water tank is stabilized; the first temperature sensor is arranged at the water supply end of the solar thermal collector and used for providing temperature information of the water supply end; the controller is respectively electrically connected with the solar thermal collector and the first temperature sensor, and can control water with different temperatures in the solar thermal collector to enter the heat storage water tank according to temperature information.
Description
Technical Field
The invention belongs to the technical field of solar heat utilization, and particularly relates to a phase change box and a solar energy directional water intake step phase change heat storage device.
Background
Energy is an indispensable resource for human survival, with the rapid development of industrialization and the increase of global population, the energy is increasingly in short supply and short demand, the energy problem is closely concerned by people, and how to improve the energy use efficiency and develop new energy is a worldwide important subject facing the human needs.
Clean environmental protection and the novel energy that can renew, the range of application is very wide, wherein the solar photothermal system is a more mature application, more traditional mode of storing solar energy is stored for utilizing the energy that hot water storage tank collected solar collector, but because reasons such as weather modification solar collector heat collection efficiency difference, make the temperature that gets into hot water storage tank from solar collector also change, traditional energy storage mode exists unstablely, the heat-retaining quantity is limited, can not classified storage and the temperature in the hot water storage tank descends and leads to the unable heating demand that satisfies the user of water tank when solar energy stops to heat storage tank heat supply at night.
Disclosure of Invention
The invention aims to provide a phase change box and a solar energy directional water inlet and outlet step phase change heat storage device, and solves the problems that an energy storage mode in the prior art is unstable, the heat storage amount is limited, classified storage cannot be realized, and the water temperature in a heat storage water tank is reduced when solar energy stops supplying heat to the heat storage water tank at night, so that the water tank cannot meet the heating requirement of a user.
In order to solve the technical problems, the invention adopts the following technical scheme:
a phase change box comprises a first cavity, a second cavity, a plurality of supporting nets and a plurality of first water inlets, wherein the first cavity and the second cavity are sleeved with the supporting nets; the upper surface and the lower surface of the first cavity are both sealing structures, the upper surface of the second cavity is a sealing structure, and the lower surface of the second cavity is open; each support net is annular and is arranged in the first cavity, the first cavity is divided into a plurality of sections of phase change layers, and each phase change layer is filled with phase change materials with gradually decreasing temperature phase change from top to bottom; the plurality of first water inlets are respectively arranged on the phase change layers, penetrate through the first cavities and are communicated with the second cavities.
A solar energy directional water inlet cascade phase change heat storage device comprises: the solar water heater comprises a plurality of phase change boxes, a solar heat collector and a heat storage water tank first temperature sensor, wherein the solar heat collector is used for providing water with different temperatures; one end of the heat storage water tank is connected with the water supply end of the solar heat collector, and the other end of the heat storage water tank is connected with the water return end of the solar heat collector; the phase change boxes are arranged in the heat storage water tanks through support rods, and the plurality of phase change boxes (3) are parallel to the box body of the heat storage water tank (2) connected with the water supply end of the solar heat collector (1); the first temperature sensor is arranged at the water supply end of the solar thermal collector and used for measuring the temperature information of the water supply end of the solar thermal collector.
The phase change heat storage device further comprises a first controller which is respectively electrically connected with the solar heat collector and the first temperature sensor and can control water with different temperatures in the solar heat collector to enter the heat storage water tank according to the temperature information.
The phase change heat storage device also comprises a layered water collector which is connected with the heat storage water tank and used for conveying water with different temperatures in the heat storage water tank to a user.
The solar heat collector water supply end comprises a plurality of water supply branches, a plurality of second water inlets are formed in the side wall, close to one side of the solar heat collector, of the heat storage water tank, the number of the water supply branches is consistent with that of the second water inlets, the water supply branches are connected in a one-to-one correspondence mode, valves are arranged on the water supply branches respectively, and the first controller can control the opening and closing of the valves on the water supply branches according to temperature information of the first temperature sensor.
The side wall of the heat storage water tank is also provided with a heating water supply end and a heating water return end, the layered water collector supplies water in the heat storage water tank to users through the heating water supply end, and the users return the used water to the heat storage water tank through the heating water return end.
The heat storage water tank further comprises a first water supply end, a first water return end and a second water return end, the first water supply end is connected with a tap water inlet, the first water return end is connected with a sewage discharge pipeline, and the second water return end is connected with a water return end of the solar heat collector.
And a circulating pump is arranged at the water return end of the solar heat collector.
Compared with the prior art, the invention has the following technical effects:
according to the phase change box disclosed by the invention, the phase change box is divided into a plurality of phase change layers by arranging the plurality of supporting nets in the phase change box, the phase change materials with the decreasing temperature are filled in the phase change layers, and hot water heat entering the phase change box is stored in a temperature-divided manner through phase change energy storage of the phase change materials, so that the layering of water in the heat storage water tank is stabilized, and the heat storage efficiency of solar energy is improved.
According to the heat storage device, the first temperature sensor is arranged, water with different temperatures can be conveyed to the heat storage water tank to be stored in a layered mode, the phase change tank is arranged in the heat storage water tank, the phase change layer is arranged on the phase change tank, heat of the water with different temperatures can be stored in a temperature-divided mode through the phase change layer, on one hand, the stability of a layered water layer in the heat storage water tank can be enhanced, on the other hand, after the water supply end of the solar heat collector stops supplying hot water at night, the phase change layer conducts phase change heat exchange on the stored heat and the water in the heat storage water tank, the layered state of the water in the heat storage water tank is maintained, classified management and utilization of solar energy are achieved, and the utilization rate of.
According to the heat storage device, the layered water taking device is arranged, so that water layers with different temperatures in the heat storage water tank are correspondingly conveyed to users, the stability of water taking is enhanced, and the requirements of the users are greatly met.
(IV) according to the heat storage device, the plurality of water supply branches are arranged at the water supply end of the solar heat collector, the water supply branches are correspondingly connected with the plurality of first water inlets one by one, the valves are arranged on the water supply branches, and the first controller can control the opening and closing of the valves on the water supply branches according to the temperature information of the first temperature sensor, so that classified accurate water supply of the solar heat collector is realized, and the heat efficiency of the solar heat collector is improved.
Drawings
FIG. 1 is a schematic diagram of the construction of the phase change box of the present invention;
fig. 2 is a schematic view of the overall structure of the thermal storage device of the present invention.
The meaning of the individual reference symbols in the figures is:
1-a solar heat collector, 2-a heat storage water tank, 3-a phase change box, 4-a first temperature sensor, 5-a layered water collector, 6-a support rod and 7-a support net;
101-a water supply branch;
201-a second water inlet, 202-a heating water supply end, 203-a heating water return end, 204-a first water supply end, 205-a first water return end, 206-a second water return end, 207-a water pump;
301-phase change layer, 302-first cavity, 303-second cavity, 304-first water inlet.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
a phase change box comprises a first cavity 302, a second cavity 303, a plurality of supporting nets 7 and a plurality of first water inlets 304, wherein the first cavity 302 and the second cavity 303 are sleeved with the plurality of supporting nets, the upper surface and the lower surface of the first cavity 302 are both sealed structures, the upper surface of the second cavity 303 is a sealed structure, and the lower surface of the second cavity 303 is open; each supporting net 7 is annular and is arranged in the first cavity 302, the first cavity 302 is divided into a plurality of sections of phase change layers 301, and each phase change layer (301) is filled with phase change materials with gradually decreasing temperature from top to bottom;
a plurality of first water inlets 304 are respectively arranged on each phase change layer 301, penetrate through the first cavity 302 and are communicated with the second cavity 303).
In the embodiment, the phase change box is divided into three phase change layers 301, the phase change temperatures of the phase change layers 301 filled with phase change materials from the bottom to the top are respectively 40 ℃, 55 ℃ and 70 ℃, the phase change materials filled in the phase change layers at 40 ℃ are Joule wax industry No. 41 ground heating phase change wax and graphite, and the filling mass ratio is 1: 3; the phase change material filled in the 55 ℃ phase change layer is sodium acetate trihydrate and graphite, and the filling mass ratio is as follows: 9: 1; the phase change material filled in the 70 ℃ phase change layer is Joule wax No. 70 solar phase change wax and graphite, and the filling mass ratio is 1: 3.
Example 2:
a solar directional water inlet cascade phase change thermal storage device, as shown in fig. 1-2, comprising: the phase change boxes, the solar thermal collector 1, the heat storage water tank 2 and the first temperature sensor 4 are all described in the embodiment 1, wherein the solar thermal collector 1 is used for providing water with different temperatures; one end of the heat storage water tank 2 is connected with a water supply end of the solar heat collector 1, the other end of the heat storage water tank 2 is connected with a water return end of the solar heat collector 1, and the phase change tank 3 is arranged in the heat storage water tank 2 through a support rod 6; the phase change tanks 3 are arranged in the heat storage water tank 2, and a plurality of phase change tanks 3 are parallel to the tank body of the heat storage water tank 2 connected with the water supply end of the solar heat collector 1; the phase change layer 301 is used for storing the heat of water with different temperatures provided by the water supply end of the solar heat collector 1 in a classified manner, and after the water supply end of the solar heat collector 1 stops supplying water at night, the phase change layer performs phase change heat exchange on the stored heat and the water in the heat storage water tank 2 to stabilize the layering of the water body in the heat storage water tank 2; the first temperature sensor 4 is arranged at the water supply end of the solar thermal collector 1 and used for measuring the temperature information of the water supply end of the solar thermal collector 1. The first controller is respectively electrically connected with the solar thermal collector 1 and the first temperature sensor 4, and can control water with different temperatures in the solar thermal collector 1 to enter the heat storage water tank 2 according to the temperature information.
The device of the invention conveys water with different temperatures to the heat storage water tank 2 for layered storage by arranging the first temperature sensor 1, furthermore, a phase change tank 3 is arranged in the heat storage water tank 2, a phase change layer 301 is arranged in the phase change tank 3, the phase change layer 301 can store the heat of water with different temperatures in a temperature-divided manner, on one hand, the stability of a layered water layer in the heat storage water tank 2 can be enhanced, on the other hand, after the water supply end of the solar heat collector 1 stops supplying hot water at night, the phase change layer 301 performs phase change heat exchange between the stored heat and the water in the thermal storage water tank 2, thereby maintaining the layered state of the water body in the heat storage water tank 2, realizing the classified management and utilization of the solar energy, effectively improving the utilization rate of the energy, the direction of the arrows in the figure indicates the flow path of water, and the number of the phase change tanks adopted in the embodiment is 2, so that the heat storage in the hot water is increased, and the layering of the water body in the heat storage water tank is enhanced.
As a preferable scheme of this embodiment, the phase change heat storage apparatus further includes a first controller, which is electrically connected to the solar thermal collector 1 and the first temperature sensor 4, respectively, and is capable of controlling water with different temperatures in the solar thermal collector 1 to enter the heat storage water tank 2 according to the temperature information; the first controller is an HY329DHT series solar temperature controller.
As a preferable scheme of this embodiment, the stratified water collector 5 is connected to the hot water storage tank 2, and is configured to deliver water at different temperatures in the hot water storage tank 2 to a user.
The working principle of the layered water taking device 5 is the same as that of a layered water taking device in a solar layered heat storage water tank directional water taking device with the application number of 201610012709.2.
As a preferable scheme of this embodiment, the water supply end of the solar thermal collector 1 includes a plurality of water supply branches 101, a plurality of second water inlets 201 are disposed on the side wall of the thermal storage water tank 2 near one side of the solar thermal collector 1, the number of the water supply branches 101 is consistent with the number of the second water inlets 201 and is connected in a one-to-one correspondence manner, a valve is disposed on each water supply branch 101, and the controller can control opening and closing of the valve on each water supply branch 101 according to temperature information of the first temperature sensor 4.
In this embodiment, the phase change tank 3 is divided into three phase change layers 301, the water body in the corresponding thermal storage tank 2 is layered into three layers, the three layers are respectively recorded as 1 layer, 2 layers and 3 layers from the bottom of the thermal storage tank, 101 three water supply branches are provided, three first water inlets 201 are provided, a third temperature sensor is respectively installed on the side wall of the thermal storage tank 2 corresponding to each layer of water body, the third temperature sensor continuously monitors the water temperatures of the 1 layer, the 2 layer and the 3 layer and is respectively T1, T2 and T3, the valves on the corresponding water supply branches 101 are V1, V2 and V3, the temperature of the water supply end of the solar thermal collector 1 measured by the first temperature sensor 4 is recorded as Tc, and the water supply principle of the water supply end of the solar thermal collector 1 is as follows: when the measured temperature difference between the water supply end temperature Tc of the solar heat collector 1 and the bottom layer temperature T0 of the heat storage water tank 2 is larger than the minimum opening temperature difference value, comparing Tc with the water temperatures T1, T2 and T3 of each layer in the heat storage water tank, and recording the temperature layer with the minimum absolute value of the temperature difference as a; when a is 1, the valve V1 is opened, and the valves V2 and V3 are closed; when a is 2, the valve V2 is opened, and the valve V1 and the valve V3 are closed; when a is 3, the valve V3 is opened, and the valves V1 and V2 are closed.
The working principle of the phase change box 3 is as follows:
when water at the water supply end of the solar heat collector 1 enters the heat storage water tank 1 through the water supply branch 101, the water enters the second cavity 303 through the second water inlet 304 on the corresponding phase change layer 301 under the action of flow velocity to exchange heat with the phase change material in the corresponding phase change layer 301 in a phase change manner, so that the phase change layer 301 stores heat energy, when the water temperature at the water supply end of the solar heat collector 1 drops, hot water stops being provided for the heat storage water tank 1, the water temperature in the heat storage water tank 1 drops, when the water temperature begins to be lower than the phase change temperature of the phase change material in each phase change layer 301, the phase change material can exchange heat with the water in the heat storage water tank, thereby stabilizing the temperature of the water in the heat storage water tank 2 and the stability of a water layer, and achieving the purpose of taking water by a user at night.
As a preferable scheme of this embodiment, the side wall of the thermal storage water tank 2 is further provided with a heating water supply end 202 and a heating water return end 203, the layered water collector 5 supplies water in the thermal storage water tank 2 to a user through the heating water supply end 202, and the user returns the used water to the thermal storage water tank 2 through the heating water return end 203, so that the water resource is recycled, and the resource utilization rate is improved.
As a preferable scheme of this embodiment, the hot water storage tank 2 further includes a first water supply end 204, a first water return end 205, and a second water return end 206, the first water supply end 204 is connected to a tap water inlet, the first water return end 205 is connected to a sewage pipe, and the second water return end 206 is connected to a water return end of the solar heat collector 1.
The first water supply end 304 is connected to a tap water pipe, so that water storage required in the heat storage water tank 1 can be provided, the first water return end 205 can timely remove dirt in the heat storage water tank 2, the second water return end 206 can return the heat storage water tank 2 to the solar thermal collector 1, the circulating water pump 207 is arranged on a pipeline of the second water return end 206 to enhance water circulation, and the utilization rate of water resources is improved.
As a preferable solution of this embodiment, a circulation pump 207 is disposed at the water return end of the solar thermal collector 1, and is used for accelerating the flow rate of water at the water return end of the solar thermal collector 1.
Claims (8)
1. A phase change box, comprising:
a first cavity (302) and a second cavity (303) which are sleeved; the upper surface and the lower surface of the first cavity (302) are both sealing structures, the upper surface of the second cavity (303) is a sealing structure, and the lower surface of the second cavity (303) is opened;
the supporting nets (7) are annular and arranged in the first cavity (302), the first cavity (302) is divided into a plurality of sections of phase change layers (301), and each phase change layer (301) is filled with phase change materials with gradually reduced temperature phase change from top to bottom;
and the first water inlets (304) are respectively arranged on the phase change layers (301), penetrate through the first cavity (302) and are communicated with the second cavity (303).
2. The utility model provides a solar energy directional water intaking step phase change heat storage device which characterized in that includes:
a plurality of phase change boxes (3) according to claim 1;
a solar collector (1) for providing water at different temperatures;
one end of the heat storage water tank (2) is connected with a water supply end of the solar heat collector (1), and the other end of the heat storage water tank (2) is connected with a water return end of the solar heat collector (1); the phase change boxes (3) are arranged in the heat storage water tank (2) through support rods (6), and the phase change boxes (3) are parallel to a box body of the heat storage water tank (2) connected with a water supply end of the solar heat collector (1);
the first temperature sensor (4) is arranged at the water supply end of the solar thermal collector (1) and used for measuring the temperature information of the water supply end of the solar thermal collector (1).
3. The solar directional water step phase change thermal storage device of claim 2, further comprising:
the first controller is respectively electrically connected with the solar heat collector (1) and the first temperature sensor (4), and can control water with different temperatures in the solar heat collector (1) to enter the heat storage water tank (2) according to the temperature information.
4. The solar directional water step phase change thermal storage device of claim 2, further comprising:
and the layered water taking device (5) is connected with the heat storage water tank (2) and is used for conveying water with different temperatures in the heat storage water tank (2) to a user.
5. The solar energy directional water inlet step phase change heat storage device according to claim 2, wherein the water supply end of the solar heat collector (1) comprises a plurality of water supply branches (101), the side wall of the heat storage water tank (2) close to one side of the solar heat collector (1) is provided with a plurality of second water inlets (201), the number of the water supply branches (101) is consistent with the number of the second water inlets (201) and is connected in a one-to-one correspondence manner, each water supply branch (101) is provided with a valve, and the first controller can control the opening and closing of the valves on each water supply branch (101) according to the temperature information of the first temperature sensor (4).
6. The solar energy step phase change heat storage device with directional water inlet according to claim 5, characterized in that the side wall of the heat storage water tank (2) is further provided with a heating water supply end (202) and a heating water return end (203), the layered water collector (5) supplies water in the heat storage water tank (2) to users through the heating water supply end (202), and the users return used water to the heat storage water tank (2) through the heating water return end (203).
7. Solar step phase change heat storage device with directional water inlet according to claim 2, characterized in that the heat storage water tank (2) further comprises a first water supply end (204), a first water return end (205) and a second water return end (206), wherein the first water supply end (204) is connected with a tap water inlet, the first water return end (205) is connected with a sewage drain, and the second water return end (206) is connected with a water return end of the solar heat collector (1).
8. Solar directional water inlet cascade phase change thermal storage device according to claim 2, characterized in that a circulation pump (207) is provided at the water return end of the solar collector (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010694271.7A CN112013448A (en) | 2020-07-17 | 2020-07-17 | Phase change box and solar energy directional water inlet and outlet step phase change heat storage device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010694271.7A CN112013448A (en) | 2020-07-17 | 2020-07-17 | Phase change box and solar energy directional water inlet and outlet step phase change heat storage device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113028644A (en) * | 2021-03-05 | 2021-06-25 | 华北水利水电大学 | Multi-stage phase-change heat storage temperature layering water tank |
| CN114136021A (en) * | 2021-11-30 | 2022-03-04 | 中国电力工程顾问集团西北电力设计院有限公司 | Solar energy-ground source heat pump system control method and system combined with resource prediction |
| CN114264180A (en) * | 2021-12-22 | 2022-04-01 | 辽宁鼎昕商务服务有限公司 | Seasonal heat storage device for heating and use method thereof |
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| CN114264180A (en) * | 2021-12-22 | 2022-04-01 | 辽宁鼎昕商务服务有限公司 | Seasonal heat storage device for heating and use method thereof |
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Application publication date: 20201201 |