Solar power generation and heat storage system

Abstract

The invention discloses a solar power generation and heat storage system, and relates to the technical field of solar power generation and heat collection. The solar power generation and heat storage system comprises a solar energy collecting device and a heat storage device, and the solar energy collecting device is provided with a heat-conducting medium heating channel and used for generating power and heating a heat-conducting medium in the heat-conducting medium heating channel; the heat storage device comprises a heat storage container and a phase change material, a filling cavity and a heat exchange cavity which are arranged in a separated mode are formed in the heat storage container, the filling cavity is filled with the phase change material, and the heat exchange cavity is communicated with the heat-conducting medium heating channel. According to the solar power generation and heat storage system, a foamy copper / paraffin heat storage structure is adopted, the heat conductivity and conversion efficiency are improved, the solar energy utilization rate is increased, water serves as a heat-conducting medium to be directly connected between the solar heating plate and the heat storage device, and heat loss in the intermediate link is reduced.

Description

Technical Field

[0001] The present invention relates to the field of solar power generation and heat collection technology, and in particular to a solar power generation and heat storage system. Background Art

[0002] Photovoltaic solar systems are gaining more and more attention as a way to reduce energy costs and, by extension, as a way to reduce carbon footprint. Photovoltaic solar systems are typically based on solar collectors with silicon-based semiconductor active layers. However, even highly efficient collector panels can only convert 10-25% of the incoming solar energy into electrical energy, with the remainder needing to be dissipated to maintain balance. This situation therefore requires the presence of a powerful heat sink (i.e., cooling source) that can be part of any effective system.

[0003] In an exemplary technology, the existing solar heat collection and storage device includes a heat collection tube and a heat storage device. The two ends of the heat collection tube are connected to the heat storage device through a low-temperature straight tube and a high-temperature straight tube to form a closed loop. Normal temperature water flows into the solar heat collection tube through the pipeline and is heated into hot water, and then flows into the heat storage device through the pipeline for use by users. However, the utilization rate of solar energy in this solar heat collection and storage device is not high, and a large amount of heat energy is still wasted, especially during the non-hot water use period, the energy waste of the entire system is particularly serious. Summary of the invention

[0004] The main purpose of the present invention is to provide a solar power generation and heat storage system, aiming to improve the utilization rate of solar energy.

[0005] To achieve the above objectives, the present invention provides a solar power generation and heat storage system, comprising:

[0006] A solar energy collection device is provided with a heat transfer medium heating channel, the solar energy collection device is used to generate electricity and heat the heat transfer medium in the heat transfer medium heating channel; and

[0007] The heat storage device comprises a heat storage container and a phase change material, wherein the heat storage container is formed with a filling cavity and a heat exchange cavity which are separated from each other, the phase change material is filled in the filling cavity, and the heat exchange cavity is connected with the heat transfer medium heating channel.

[0008] Optionally, the solar energy collection device includes a plurality of heat exchangers connected to each other, and the number of the heat exchangers is just enough to increase the temperature of the heat transfer medium to a range of 50°C to 90°C by relying on the solar energy collection device and cause the phase change material to change from solid to liquid.

[0009] Optionally, the phase change material is paraffin.

[0010] Optionally, the cavity material of the filling cavity is foam copper.

[0011] Optionally, the solar power generation and heat storage system also includes a pneumatic motor and a generator connected to the pneumatic motor. The pneumatic motor is connected to the air outlet of the heat exchange chamber or the pipeline between the solar energy collection device and the heat storage device and is used to rotate under the drive of the gas and drive the generator connected to it to rotate and generate electricity.

[0012] Optionally, the solar power generation and heat storage system further comprises a pump, which is disposed on a pipeline between the heat storage device and the solar energy collection device and is used to accelerate the flow of the heat transfer medium.

[0013] Optionally, the solar power generation and heat storage system also includes a controller and several temperature sensors electrically connected to the controller, the pump is electrically connected to the controller, the temperature sensors are provided on the cavity of the heat exchange cavity and / or on the pipeline between the heat storage device and the solar energy collection device, the temperature sensor is used to detect the temperature of the heat conducting medium flowing through and output a temperature signal to the controller, and the controller is used to control the operation of the pump according to the temperature signal.

[0014] Optionally, the solar power generation and heat storage system further comprises a plurality of pressure sensors, which are arranged on the cavity body of the filling cavity and are used to detect the gas pressure in the filling cavity and / or the heat exchange cavity and are electrically connected to the controller.

[0015] Optionally, the solar power generation and heat storage system further comprises a plurality of solenoid valves arranged on a pipeline between the heat storage device and the solar energy collection device, and the plurality of solenoid valves are electrically connected to the controller.

[0016] Optionally, the outer periphery of the heat storage container is provided with a heat insulating protective layer for preventing heat from dissipating.

[0017] In the technical solution of the present invention, the solar power generation and heat storage system includes a solar energy collection device and a heat storage device. The solar energy collection device is provided with a heat transfer medium heating channel. The solar energy collection device is used to generate electricity and heat the heat transfer medium in the heat transfer medium heating channel. The heat storage device includes a heat storage container and a phase change material. The heat storage container is formed with a filling cavity and a heat exchange cavity which are separated. The phase change material is filled in the filling cavity, and the heat exchange cavity is connected to the heat transfer medium heating channel. It can be understood that the present invention proposes a solar power generation and heat storage system, which adopts a foam copper / paraffin heat storage structure, improves thermal conductivity and conversion efficiency, improves solar energy utilization, uses water as a heat transfer medium to directly connect the solar heating panel and the heat storage device, reduces heat loss in the intermediate link, and hot water can not only be used as washing water, but also used to make the phase change material undergo phase change to store energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a solar power generation and heat storage system of the present invention.

[0020] Description of Figure Numbers:

[0021] 10. Solar energy collecting device; 20. Heat storage device; 21. Heat storage container; 22. Phase change material; 21a. Filling cavity; 21b. Heat exchange cavity; 211. Heat insulation protective layer.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The present invention provides a solar power generation and heat storage system.

[0028] Reference Figure 1 In one embodiment of the present invention, the solar power generation and heat storage system includes a solar energy collection device 10 and a heat storage device 20. The solar energy collection device 10 is provided with a heat transfer medium heating channel. The solar energy collection device 10 is used to generate electricity and heat the heat transfer medium in the heat transfer medium heating channel. The heat storage device 20 includes a heat storage container 21 and a phase change material 22. The heat storage container 21 is formed with a filling cavity 21a and a heat exchange cavity 21b which are separated from each other. The phase change material 22 is filled in the filling cavity 21a, and the heat exchange cavity 21b is connected to the heat transfer medium heating channel.

[0029] In this embodiment, the solar energy collection device 10 may include a photovoltaic panel, a heat pipe type heat collecting tube, etc., which are not limited here.

[0030] The phase change material 22 is preferably paraffin wax, which has a very high specific heat capacity. The cavity material of the filling cavity 21a is preferably copper foam, which is mainly based on copper and has a large number of connected or unconnected holes. The copper foam can accelerate heat conduction and improve heat storage efficiency. In addition, an insulating protective layer 211 for preventing heat dissipation can be provided on the periphery of the heat storage container 21, which can reduce heat loss and further reduce heat waste.

[0031] It can be understood that the present invention proposes a solar power generation and heat storage system, which adopts a foam copper / paraffin heat storage structure to improve thermal conductivity and conversion efficiency, improve solar energy utilization, and use water as a heat transfer medium to directly connect the solar heating panel and the heat storage device 20, thereby reducing heat loss in the intermediate links. Hot water can not only be used as washing water, but also used to cause the phase change material 22 to undergo phase change to store energy.

[0032] In order to maximize the energy utilization efficiency, in one embodiment, the solar power generation and heat storage system includes a plurality of heat exchangers connected to each other. The heat exchanger can be the above-mentioned heat collecting tube or other heat collecting device. The number of heat exchangers can just meet the requirement of relying on the solar energy collection device 10 to increase the temperature of the heat transfer medium to the range of 50°C to 90°C and cause the phase change material 22 to change from solid to liquid.

[0033] Furthermore, in this embodiment, the solar power generation and heat storage system may also include a pneumatic motor and a generator connected to the pneumatic motor, the pneumatic motor is connected to the gas outlet of the heat exchange chamber 21b or the pipeline between the solar energy collection device 10 and the heat storage device 20 and is used to rotate under the drive of the gas and drive the generator connected thereto to rotate and generate electricity. In this way, the energy utilization rate is further improved.

[0034] In order to improve the conversion efficiency of solar energy, in one embodiment, the solar power generation and heat storage system may further include a pump, which is arranged on the pipeline between the heat storage device 20 and the solar energy collection device 10 and is used to accelerate the flow of the heat transfer medium.

[0035] In addition, for the purpose of saving system energy consumption, in some embodiments, the solar power generation and heat storage system also includes a controller and a plurality of temperature sensors electrically connected to the controller, the pump is electrically connected to the controller, and a temperature sensor is provided on the cavity of the heat exchange chamber 21b and / or on the pipeline between the heat storage device 20 and the solar energy collection device 10. The temperature sensor is used to detect the temperature of the heat-conducting medium flowing through and output a temperature signal to the controller, and the controller is used to control the operation of the pump according to the temperature signal.

[0036] In this embodiment, the solar power generation and heat storage system may also include a plurality of pressure sensors, which are arranged on the cavity of the filling cavity 21a and are used to detect the gas pressure in the filling cavity 21a and / or the heat exchange cavity 21b and are electrically connected to the controller. Furthermore, the solar power generation and heat storage system may also include a plurality of solenoid valves arranged on the pipeline between the heat storage device 20 and the solar energy collection device 10, and the plurality of solenoid valves are electrically connected to the controller. In this way, the system can be automated, and the solar energy can be utilized as much as possible to maximize the use of solar energy, and ensure the safe and stable operation of the system.

[0037] In summary, compared with the prior art, the solar power generation and heat storage system of the present invention combines foam copper and paraffin for the first time, thereby improving thermal conductivity and conversion efficiency; and uses water as a heat conducting medium for the first time to directly connect the solar energy collection device 10 and the heat storage device 20, thereby reducing heat loss in the intermediate links.

[0038] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A solar power generation and heat storage system, characterized in that: include: A solar energy collection device is provided with a heat-conducting medium heating channel, wherein the solar energy collection device is used to generate electricity and heat the heat-conducting medium in the heat-conducting medium heating channel; as well as The heat storage device comprises a heat storage container and a phase change material, wherein the heat storage container is formed with a filling cavity and a heat exchange cavity which are separated from each other, the phase change material is filled in the filling cavity, and the heat exchange cavity is connected with the heat transfer medium heating channel.

2. The solar power generation and heat storage system according to claim 1, characterized in that: The solar energy collection device comprises a plurality of heat exchangers connected to each other, and the number of the heat exchangers is just enough to increase the temperature of the heat transfer medium to a range of 50° C. to 90° C. by means of the solar energy collection device and cause the phase change material to change from solid to liquid.

3. The solar power generation and heat storage system according to claim 1, characterized in that: The phase change material is paraffin.

4. The solar power generation and heat storage system according to claim 3, characterized in that: The cavity material of the filling cavity is foam copper.

5. The solar power generation and heat storage system according to claim 1, characterized in that: The solar power generation and heat storage system also includes a pneumatic motor and a generator connected to the pneumatic motor. The pneumatic motor is connected to the air outlet of the heat exchange chamber or the pipeline between the solar energy collection device and the heat storage device and is used to rotate under the drive of the gas and drive the generator connected to it to rotate and generate electricity.

6. The solar power generation and heat storage system according to claim 1, characterized in that: The solar power generation and heat storage system also includes a pump, which is arranged on the pipeline between the heat storage device and the solar energy collection device and is used to accelerate the flow of the heat transfer medium.

7. The solar power generation and heat storage system according to claim 6, characterized in that: The solar power generation and heat storage system also includes a controller and a plurality of temperature sensors electrically connected to the controller. The pump is electrically connected to the controller. The temperature sensors are provided on the cavity of the heat exchange cavity and / or on the pipeline between the heat storage device and the solar energy collection device. The temperature sensor is used to detect the temperature of the heat-conducting medium flowing through and output a temperature signal to the controller. The controller is used to control the operation of the pump according to the temperature signal.

8. The solar power generation and heat storage system according to claim 7, characterized in that: The solar power generation and heat storage system further comprises a plurality of pressure sensors, which are arranged on the cavity body of the filling cavity and are used to detect the gas pressure in the filling cavity and / or the heat exchange cavity and are electrically connected to the controller.

9. The solar power generation and heat storage system according to claim 7, characterized in that: The solar power generation and heat storage system further comprises a plurality of solenoid valves arranged on the pipeline between the heat storage device and the solar energy collection device, and the plurality of solenoid valves are electrically connected to the controller.

10. The solar power generation and heat storage system according to claim 1, characterized in that: The outer periphery of the heat storage container is provided with a heat insulating protective layer for preventing heat from dissipating.

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