CN218884622U - Solar photovoltaic and hot water integrated electric heating double-heat-storage-pump dryer - Google Patents
Solar photovoltaic and hot water integrated electric heating double-heat-storage-pump dryer Download PDFInfo
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- CN218884622U CN218884622U CN202223337319.2U CN202223337319U CN218884622U CN 218884622 U CN218884622 U CN 218884622U CN 202223337319 U CN202223337319 U CN 202223337319U CN 218884622 U CN218884622 U CN 218884622U
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Abstract
The utility model relates to a photovoltaic drying technology field, in particular to two heat-retaining pump desiccators of electric heat of solar photovoltaic hot water integration. A solar photovoltaic and hot water integrated electric heating double heat storage pump dryer comprises a photovoltaic heat collection module, a heat storage module and a heat exchange module, wherein the photovoltaic heat collection module is used for carrying out solar photovoltaic conversion to generate electric energy and first-stage hot water; the heat pump module is used for heating the primary hot water by using the electric energy generated by the photovoltaic heat collection module to obtain secondary hot water; the drying module is used for conveying the heat of the secondary hot water to a product to be dried; and the waterway circulation module is used for respectively storing the primary hot water and the secondary hot water and performing waterway circulation among the photovoltaic heat collection module, the heat pump module and the drying module. The utility model provides a two heat-retaining pump desiccators of electric heat of solar photovoltaic hot water integration through utilizing photovoltaic thermal-arrest module, not only can high-efficient electricity generation and save the electric quantity in the battery, can turn into solar energy heat energy simultaneously.
Description
Technical Field
The utility model relates to a photovoltaic drying technology field, in particular to two heat-retaining pump desiccators of electric heat of solar photovoltaic hot water integration.
Background
The drying is an important step of rough processing of agricultural products, is also an important part of the transportation and sale of the agricultural products, and influences the development of the whole industry. The principle of drying is to utilize convection ventilation and heat exchange with high heat flow density to dry out moisture in agricultural products and take away the moisture by air flow, so the drying is a high-energy demand type process. Solar energy is used as a renewable energy source for photovoltaic distribution, and the solar energy is effectively utilized in the drying process, so that energy conservation and emission reduction can be realized. Solar dryers existing in the current market mainly utilize heat of solar energy, convert the solar energy into heat energy by absorbing the solar energy, use hot air or hot water as a heat exchange medium, and use a heat pump for auxiliary heating and control of heat flow, so as to provide heat for a drying process. The drying and ventilation requirements needed by the drying chamber are finally realized by equipping energy storage equipment and setting up a ventilation pipeline.
However, the current solar dryer still has partial disadvantages:
firstly, the utilization rate of solar energy is not high enough, and the energy quality of solar energy conversion is low. At present, solar energy is mainly converted into a low-temperature heat source below one hundred degrees by a solar heat collecting device, and the infrared and ultraviolet bands of the solar energy are utilized. The visible light wave band of the solar energy can be converted into high-quality electric energy by utilizing a photovoltaic technology, and the technology of comprehensively utilizing the solar photovoltaic and the photo-thermal is not reflected in a solar drying system at present.
The second is the lack of an energy source for the heat pump system. The present solar heat pump drying system mainly adopts solar energy to heat the front section, and adopts a heat pump to further heat the hot water generated in the first stage. While driving the heat pump requires a lot of electrical energy, current solar heat pump systems only consider the first stage of heat energy and do not provide the heat pump with energy.
Third, there are problems with the energy storage structure. Because solar energy can only be used in sunny days, solar energy cannot be used for drying at night and in rainy days. Even if the current solar dryer is matched with a certain heat storage device, on one hand, the heat storage efficiency is low, and on the other hand, the heat storage quantity is always limited. Due to the lack of multi-gradient energy storage and the lack of separate adoption of electricity storage for heat pumps, the system cannot work in the face of continuous rainy weather.
Therefore, further improvements in solar dryers are still needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a solar photovoltaic and hot water integrated electric heating double heat storage pump dryer, which comprises
And the photovoltaic heat collection module is used for carrying out solar photoelectric conversion to generate electric energy and primary hot water.
And the heat pump module is used for heating the primary hot water by using the electric energy generated by the photovoltaic heat collection module to obtain secondary hot water.
And the drying module is used for conveying the heat of the secondary hot water to a product to be dried.
And the waterway circulation module is used for respectively storing the primary hot water and the secondary hot water and performing waterway circulation among the photovoltaic heat collection module, the heat pump module and the drying module.
The photovoltaic heat collection module comprises a photovoltaic heat absorption plate, the photovoltaic heat absorption plate is a metal plate with one side coated with a selective absorption coating, a photovoltaic cell array is laminated on the side coated with the selective absorption coating, and a heat exchange tube is fixed on the side not coated with the selective absorption coating. The heat exchange tube exchanges heat with cold water in the water path to generate primary hot water.
In one embodiment, the photovoltaic heat collection module further includes a transparent housing and a strength backing plate. The transparent shell is arranged on one side of the photovoltaic heat absorbing plate coated with the selective absorbing coating, and the strength back plate is arranged on one side of the photovoltaic heat absorbing plate provided with the heat exchange tubes.
In one embodiment, an air insulation layer is disposed between the transparent casing, the photovoltaic absorber plate and the strength backing plate.
In one embodiment, the heat pump module includes a battery, a dc controller, and a heat pump. The storage battery stores the electric energy converted by the photovoltaic heat collection module and supplies power to the heat pump. The direct current controller is arranged between the storage battery and the heat pump and used for controlling the heating efficiency of the heat pump.
In one embodiment, the heat pump comprises a direct-current variable-frequency compressor, an evaporator, a condenser, a throttle valve and a working medium pump. The direct-current variable frequency compressor enables energy absorbed by a working medium of the heat pump in the evaporator to be integrated into a high-temperature heat source, and the high-temperature heat source exchanges heat with primary hot water in the condenser, so that the primary hot water is heated into secondary hot water. The heat-exchanged heat pump working medium is subjected to heat pump circulation through a throttle valve, and the working medium pump provides power for the heat pump circulation.
In one embodiment, the drying module comprises a drying heat exchanger, and the drying heat exchanger receives the secondary hot water conveyed by the heat pump module to exchange heat between the secondary hot water and the product to be dried.
In one embodiment, the waterway circulation module includes a primary hot water tank and a secondary hot water tank.
The primary hot water tank is communicated with the photovoltaic heat collection module, and primary circulation can be performed on the primary hot water tank and the photovoltaic heat collection module. The first-stage hot water tank is communicated with the second-stage hot water tank through the heat pump module.
The secondary hot water tank is communicated with the drying module, and secondary circulation can be performed on the secondary hot water tank and the drying module.
In one embodiment, a return pipeline is arranged between the primary hot water tank and the secondary hot water tank, so that water with the temperature lower than the set temperature in the secondary circulation flows back to the primary circulation.
In one embodiment, temperature sensors are disposed in both the primary hot water tank and the secondary hot water tank.
In one embodiment, the waterway circulation module further comprises a pumping device that powers the waterway circulation module.
Based on the above, compare with prior art, the utility model provides a two heat-retaining pump desiccators of electric heat of solar photovoltaic hot water integration, through utilizing photovoltaic thermal-arrest module, not only can high-efficient electricity generation and save the electric quantity in the battery, scribble the absorber plate of high absorption rate selective coating in this heat collector simultaneously and can also effectively absorb solar energy to turn into solar energy heat energy, and utilize the heat exchange tube heat transfer at back, take away the heat energy of solar energy conversion and store hot water in the one-level hot-water tank by water. The electricity that the photovoltaic sent can drive the water in the heat pump feed water tank and heat up, so not only can further heat the primary hot water and reach the required temperature of stoving, can also improve drying efficiency through the hydrothermal temperature of heat pump circulation effective control second grade. The utility model discloses effectively store the form of solar energy transformation for electric energy and heat energy, prolonged holistic live time.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts; in the following description, the drawings are illustrated in a schematic view, and the drawings are not intended to limit the present invention.
Fig. 1 is a schematic diagram of an operation logic according to an embodiment of the present invention.
Fig. 2 is a logic diagram of the operation of an embodiment of the belt return line of the present invention.
Fig. 3 is a front view of a photovoltaic absorber plate according to an embodiment of the present invention.
Fig. 4 is a rear view of a photovoltaic absorber plate according to an embodiment of the present invention.
Fig. 5 is a cross-sectional view of a photovoltaic heat collecting module according to an embodiment of the present invention.
Reference numerals:
100 photovoltaic heat collecting module 110 photovoltaic heat absorbing plate 111 metal plate
112 photovoltaic cell array 113 heat exchange tube 120 transparent shell
130 strength backplate 140 air insulation layer 200 heat pump module
210 storage battery 220 direct current controller 230 heat pump
231 DC frequency conversion compressor 232 evaporator 233 condenser
234 throttle valve 235 working medium pump 300 drying module
310 drying heat exchanger 400 waterway circulation module 410 primary hot water tank
420 second-stage hot water tank 430 return line
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention; the technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that all terms (including technical terms and scientific terms) used in the present invention have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, and cannot be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In specific implementation, as shown in fig. 1 to 5, the solar photovoltaic and hot water integrated electric-heating dual-heat-storage-pump 230 dryer includes a photovoltaic heat collection module 100, a heat pump module 200, a drying module 300, and a water path circulation module 400.
The photovoltaic heat collecting module 100 performs solar photovoltaic conversion to generate electric energy and primary hot water.
The heat pump module 200 heats the primary hot water using the electric energy generated by the photovoltaic heat collecting module 100 to obtain secondary hot water.
The drying module 300 is used for transferring the heat of the secondary hot water to the product to be dried.
The water circulation module 400 is configured to store the first-stage hot water and the second-stage hot water, and perform water circulation among the photovoltaic heat collection module 100, the heat pump module 200, and the drying module 300.
The photovoltaic heat collection module 100 comprises a photovoltaic heat absorption plate 110, the photovoltaic heat absorption plate 110 is a metal plate 111 with one side coated with a selective absorption coating, a photovoltaic cell array 112 is laminated on the side of the metal plate 111 coated with the selective absorption coating, and a heat exchange tube 113 is fixed on the side of the metal plate 111 not coated with the selective absorption coating. The heat exchange pipe 113 exchanges heat with cold water in the waterway to generate primary hot water.
Specifically, the selective absorption coating coated on the photovoltaic heat absorption plate 110 can convert more than 95% of the received solar energy in infrared and ultraviolet bands into heat energy, the heat energy absorbed and converted by the selective absorption coating is conducted to the heat exchange tube 113 on the back of the photovoltaic heat absorption plate 110 through the photovoltaic heat absorption plate 110, and exchanges heat with water in the heat exchange tube 113 to generate primary hot water. Meanwhile, the photovoltaic cell array 112 laminated on the photovoltaic heat absorption plate 110 converts solar energy into electric energy to be transmitted to the heat pump module 200. The heat pump module 200 heats the primary hot water into the secondary hot water, and the drying module 300 dries using the secondary hot water.
Specifically, the primary hot water is obtained by solar heat exchange, so that the temperature is lower and cannot be accurately controlled, and the specific temperature is not specifically set. The second-stage hot water is obtained by further heating the heat pump module 200, the specific temperature range of the second-stage hot water can be adjusted by workers in the field according to the drying requirement and the specification of the heat pump 230, and the temperature of the second-stage hot water is higher than 55 ℃.
During actual work, the waterway circulation module 400 is communicated with the photovoltaic heat collection module 100, the heat pump module 200 and the drying module 300, the whole waterway circulation comprises that cold water flows through the photovoltaic heat collection module 100 to obtain primary hot water, the primary hot water is heated by the heat pump module 200 to obtain secondary hot water, and the secondary hot water exchanges heat at the drying module 300 to dry a product. Meanwhile, the waterway circulation module 400 can drain or supplement water in the circulation process, so that idling of each module caused by overlarge waterway pressure or insufficient water is prevented.
Further, as shown in fig. 3, the pv cell array 112 may be a rectangular array, and there is a gap between individual pv cells, and the size of the gap and the specification of the individual pv cells can be adjusted by those skilled in the art according to actual situations.
In one embodiment, as shown in fig. 3 to 5, the photovoltaic heat collection module 100 further includes a transparent housing 120 and a strength backing plate 130. The transparent shell 120 is disposed on one side of the photovoltaic heat absorbing plate 110 coated with the selective absorbing coating, and the strength back plate 130 is disposed on one side of the photovoltaic heat absorbing plate 110 provided with the heat exchanging pipe 113. In particular, the transparent housing 120 may be transparent tempered glass. The transparent shell 120 can prevent the photovoltaic heat absorbing plate 110 from being damaged, and can reduce the influence of environmental dust on the photovoltaic heat absorbing plate 110, thereby facilitating maintenance. The strength back plate 130 provides strength support to the photovoltaic heat collecting module 100, facilitating operation during installation.
In one embodiment, as shown in fig. 5, an air insulation layer 140 is disposed between the transparent casing 120, the photovoltaic heat absorbing plate 110 and the strength backing plate 130. The air insulation layer 140 can prevent heat of the photovoltaic heat absorbing plate 110 from being lost to the transparent shell 120 and the strength back plate 130, so that the heat exchange efficiency is further improved.
In one embodiment, as shown in fig. 1-2, the heat pump module 200 includes a battery 210, a dc controller 220, and a heat pump 230. The storage battery 210 stores the electric energy converted by the photovoltaic heat collection module 100 and supplies power to the heat pump 230. The dc controller 220 is provided between the battery 210 and the heat pump 230, and controls the heating efficiency of the heat pump 230.
In one embodiment, as shown in fig. 1-2, heat pump 230 includes a dc inverter compressor 231, an evaporator 232, a condenser 233, a throttle valve 234, and a working fluid pump 235. The direct current variable frequency compressor 231 enables energy absorbed by working media of the heat pump 230 in the evaporator 232 to be integrated into a high-temperature heat source, and the high-temperature heat source exchanges heat with the primary hot water in the condenser 233, so that the primary hot water is heated into secondary hot water. The heat-exchanged working medium of the heat pump 230 is circulated through the heat pump 230 by the throttle valve 234, and the working medium pump 235 provides power for the circulation of the heat pump 230. Specifically, the heat pump 230 uses the reverse carnot cycle principle to obtain a low-temperature heat source through air heat storage, and the low-temperature heat source is integrated by the dc inverter compressor 231 to become a high-temperature heat source for supplying hot water.
Further, the specific type of heat pump 230 may be adjusted by those skilled in the art based on the maximum temperature of the secondary hot water required to enable safe operation of the heat pump module 200 within the load.
In an embodiment, as shown in fig. 1 to 2, the drying module 300 includes a drying heat exchanger 310, and the drying heat exchanger 310 receives the secondary hot water delivered by the heat pump module 200, so that the secondary hot water exchanges heat with the product to be dried.
Further, the drying heat exchanger 310 may be a shell-and-tube heat exchanger or a plate heat exchanger, which is low in cost, convenient to maintain, and high in overall heat exchange efficiency.
In one embodiment, as shown in fig. 1, the waterway circulation module 400 includes a primary hot water tank 410 and a secondary hot water tank 420.
The primary hot water tank 410 is communicated with the photovoltaic heat collection module 100, and the primary hot water tank 410 and the photovoltaic heat collection module 100 can perform primary circulation. The primary hot water tank 410 and the secondary hot water tank 420 are in rear communication via the heat pump module 200.
The secondary hot water tank 420 is communicated with the drying module 300, and the secondary hot water tank 420 and the drying module 300 can perform secondary circulation.
Specifically, the primary circulation is that water in the primary hot water tank 410 exchanges heat with the photovoltaic heat collection module 100, and the primary hot water after heat exchange flows back into the primary hot water tank 410. After a plurality of times of primary circulation, the temperature of the primary hot water in the primary circulation can be kept constant. The first-stage hot water tank 410 is communicated with the second-stage hot water tank 420, a connecting waterway flows through the heat pump module 200, and when necessary, the first-stage hot water in the first-stage circulation flows to the second-stage hot water tank 420 and is heated by the heat pump module 200 to become second-stage hot water. Meanwhile, the primary circulation can be supplemented with water flow from the outside, so that the water quantity in the primary circulation is kept unchanged.
The secondary circulation is the circulation of the secondary hot water tank 420 and the drying module 300, and the secondary hot water in the secondary hot water tank 420 flows to the drying module 300 and flows back to the secondary hot water tank 420 after the heat exchange of the drying module 300. The secondary hot water tank 420 continuously receives the newly generated secondary hot water, and the temperature in the secondary hot water tank 420 is kept within a set range. Meanwhile, the secondary hot water after heat exchange with the drying module 300 can be discharged out of the secondary circulation, so that excessive water and too low temperature in the secondary circulation are prevented.
Preferably, as shown in fig. 2, a return line 430 is provided between the first stage hot water tank 410 and the second stage hot water tank 420 to return water having a temperature lower than a set temperature in the second stage circulation to the first stage circulation. Specifically, after the return line 430 is arranged, the primary circulation and the secondary circulation are integrated into an internal circulation, so that the dependence on the outside is reduced.
Further, temperature sensors are disposed in the first-stage hot water tank 410 and the second-stage hot water tank 420. After the temperature sensor is arranged, the heat pump module 200 can automatically control the start and stop of the heat pump module 200 according to signals of the temperature sensor, so that the electric heating double-storage heat pump 230 dryer integrating solar energy, photovoltaic and hot water can automatically maintain the temperature of primary circulation and secondary circulation, and the drying process is more intelligent.
In one embodiment, as shown in fig. 1-2, the waterway circulation module 400 further comprises a pumping device that powers the waterway circulation module 400. Specifically, the pumping device may be a water pump. Preferably, the pumping device is at least disposed between the primary hot water tank 410 and the secondary hot water tank 420 to ensure the normal operation of the overall circulation.
Specifically, those skilled in the art can design specific pipeline connections according to the above description of the water circulation module 400, and details are not described herein.
Furthermore, pumping devices can be independently arranged in the primary circulation and the secondary circulation to ensure the normal operation of respective circulation.
In addition, it will be appreciated by those skilled in the art that although a number of problems exist in the prior art, each embodiment or aspect of the present invention may be improved only in one or a few aspects, without necessarily simultaneously solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.
Although terms such as photovoltaic heat collection module, photovoltaic heat absorber plate, metal plate, photovoltaic cell array, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention; the terms "first," "second," and the like (if any) in the description and claims of embodiments of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a solar photovoltaic hot water integrated electric heat two heat-retaining pump desiccators which characterized in that: comprises that
The photovoltaic heat collection module is used for carrying out solar photoelectric conversion to generate electric energy and primary hot water;
the heat pump module is used for heating the primary hot water by using the electric energy generated by the photovoltaic heat collection module to obtain secondary hot water;
the drying module is used for conveying the heat of the secondary hot water to a product to be dried;
the waterway circulation module is used for respectively storing the primary hot water and the secondary hot water and performing waterway circulation among the photovoltaic heat collection module, the heat pump module and the drying module;
the photovoltaic heat collection module comprises a photovoltaic heat absorption plate, the photovoltaic heat absorption plate is a metal plate with one side coated with a selective absorption coating, a photovoltaic cell array is laminated on the side coated with the selective absorption coating, and a heat exchange tube is fixed on the side not coated with the selective absorption coating; the heat exchange tube exchanges heat with cold water in the water path to generate primary hot water.
2. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer as claimed in claim 1, wherein: the photovoltaic heat collection module also comprises a transparent shell and a strength back plate; the transparent shell is arranged on one side of the photovoltaic heat absorbing plate coated with the selective absorbing coating, and the strength back plate is arranged on one side of the photovoltaic heat absorbing plate provided with the heat exchange tube.
3. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer of claim 2, characterized in that: and an air heat insulation layer is arranged among the transparent shell, the photovoltaic heat absorption plate and the strength back plate.
4. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer of claim 1, characterized in that: the heat pump module comprises a storage battery, a direct current controller and a heat pump; the storage battery stores the electric energy converted by the photovoltaic heat collection module and supplies power to the heat pump; the direct current controller is arranged between the storage battery and the heat pump and used for controlling the heating efficiency of the heat pump.
5. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer as claimed in claim 4, wherein: the heat pump comprises a direct-current variable-frequency compressor, an evaporator, a condenser, a throttle valve and a working medium pump; the direct-current variable-frequency compressor enables energy absorbed by a working medium of a heat pump in the evaporator to be integrated into a high-temperature heat source, and the condenser exchanges heat with the primary hot water to enable the primary hot water to be heated into secondary hot water; and the heat-exchanged heat pump working medium is subjected to heat pump circulation through a throttle valve, and the working medium pump provides power for the heat pump circulation.
6. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer as claimed in claim 1, wherein: the drying module comprises a drying heat exchanger, and the drying heat exchanger receives the secondary hot water conveyed by the heat pump module to exchange heat between the secondary hot water and a product to be dried.
7. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer of claim 1, characterized in that: the waterway circulation module comprises a primary hot water tank and a secondary hot water tank;
the primary hot water tank is communicated with the photovoltaic heat collection module, and primary circulation can be performed on the primary hot water tank and the photovoltaic heat collection module; the primary hot water tank is communicated with the secondary hot water tank through the heat pump module;
the secondary hot water tank is communicated with the drying module, and the secondary hot water tank and the drying module can perform secondary circulation.
8. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer of claim 7, characterized in that: and a return pipeline is arranged between the primary hot water tank and the secondary hot water tank, so that water with the temperature lower than the set temperature in the secondary circulation flows back to the primary circulation.
9. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer of claim 7, characterized in that: and temperature sensors are arranged in the first-stage hot water tank and the second-stage hot water tank.
10. The solar photovoltaic and hot water integrated electric heating double heat storage pump dryer as claimed in claim 7, wherein: the waterway circulation module further comprises a pumping device, and the pumping device provides power for the waterway circulation module.
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| CN202223337319.2U CN218884622U (en) | 2022-12-12 | 2022-12-12 | Solar photovoltaic and hot water integrated electric heating double-heat-storage-pump dryer |
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| CN202223337319.2U CN218884622U (en) | 2022-12-12 | 2022-12-12 | Solar photovoltaic and hot water integrated electric heating double-heat-storage-pump dryer |
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