Photo-thermal conversion and heat storage system capable of realizing multi-scale multi-physical field coupling control

Abstract

The invention discloses a photo-thermal conversion and heat storage system capable of realizing multi-scale and multi-physical field coupling control. The system comprises at least one photo-thermal conversion and heat storage device embedded in a hole in a wall body, wherein each photo-thermal conversion and heat storage device comprises a glass layer, a light condensation layer and a photo-thermal conversion and heat storage layer; the light condensation layer is located on one side of the glass layer, the glass layer is composed of high-transmittance glass, and the light condensation layer is composed of Fresnel lenses; the photo-thermal conversion and heat storage layer is located on the side, away from the glass layer, of the light condensation layer. A gap exists between the light condensation layer and the photo-thermal conversion and heat storage layer to form an air channel. The photo-thermal conversion and heat storage layer is made of a photo-thermal conversion composite phase change material, and the photo-thermal conversion composite phase change material is a novel material combining the photo-thermal conversion function and the phase change heat storage characteristic. According to the scheme, photo-thermal conversion and heat storage coupling control is achieved, and the photo-thermal conversion efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photothermal conversion, and particularly to a photothermal conversion and heat storage system capable of multi-scale and multi-physical field coupling control. Background Art

[0002] In recent years, solar energy has been converted into heat energy through photothermal conversion technology so that solar energy can be stored in the form of heat energy. Furthermore, by releasing the heat energy converted from solar energy, a large amount of energy can be provided. Therefore, the conversion of solar energy into heat energy and its storage are of great importance.

[0003] Existing photothermal conversion energy storage systems usually consist of a heat collection system, an energy storage system, and a connection system. However, the heat collection system and the energy storage system are connected through the connection system, resulting in poor photothermal coupling control and difficulty in effectively regulating the heat release rate. At the same time, existing photothermal conversion energy storage systems are relatively complex and the heat transfer process is cumbersome, leading to low photothermal conversion efficiency. Summary of the Invention

[0004] The present invention provides a photothermal conversion and heat storage system capable of multi-scale and multi-physical field coupling control to solve the problems of poor photothermal coupling control and low photothermal conversion efficiency in existing photothermal conversion energy storage systems.

[0005] According to one aspect of the present invention, there is provided a photothermal conversion and heat storage system capable of multi-scale and multi-physical field coupling control. The system includes at least one photothermal conversion and heat storage device embedded in a hole in a wall. Each photothermal conversion and heat storage device includes a glass layer, a condensing layer, and a photothermal conversion and heat storage layer;

[0006] The condensing layer is located on one side of the glass layer. The glass layer is composed of high-transparency glass, and the condensing layer is composed of a Fresnel lens;

[0007] The photothermal conversion and heat storage layer is located on the side of the condensing layer away from the glass layer. There is a gap between the condensing layer and the photothermal conversion and heat storage layer to form an air channel;

[0008] The photothermal conversion and heat storage layer is made of a photothermal conversion composite phase change material, which is a material combining photothermal conversion function and phase change heat storage characteristics.

[0009] Optionally, heat pipes are embedded inside the photothermal conversion and heat storage layer. The heat pipes are designed in a serpentine structure, and the arrangement direction of the heat pipes is parallel to the surface of the wall.

[0010] Optionally, the photothermal conversion and heat storage device further includes: a vacuum insulation layer covering the first side of the photothermal conversion and heat storage layer. The first side is all sides except the second side, and the second side is the side close to the condensing layer. The internal cavity of the vacuum insulation layer is a vacuum cavity.

[0011] Optionally, the light concentrating layer is composed of at least two Fresnel lenses, and the foci of the respective Fresnel lenses in the at least two Fresnel lenses are all located on the photo-thermal conversion and heat storage layer.

[0012] Optionally, the Fresnel lens belongs to the point focusing type.

[0013] Optionally, the thickness of the vacuum insulation layer is H, where 0.02 m ≤ H ≤ 0.04 m.

[0014] Optionally, the width and height dimensions of each layer in the glass layer, the light concentrating layer, and the photo-thermal conversion and heat storage layer are the same.

[0015] Optionally, the center points of each layer in the glass layer, the light concentrating layer, and the photo-thermal conversion and heat storage layer are all located on a first straight line, and the first straight line is perpendicular to the surface of the wall.

[0016] Optionally, the first channel opening of the air channel is set as the air inlet, and the second channel opening of the air channel is set as the air outlet.

[0017] Optionally, the photo-thermal conversion and heat storage device further includes: a hot water tank, and the hot water tank is connected to one end of the heat pipe.

[0018] In the technical solution of the embodiment of the present invention, the glass layer composed of high-transmittance glass can effectively reduce the reflection of light on the surface of the glass layer, thereby reducing the loss of light passing through the glass layer; through the Fresnel lens in the light concentrating layer, the light irradiated on the photo-thermal conversion and heat storage device can be focused to form a light source that meets the preset radiation intensity, so as to improve the photo-thermal conversion efficiency; through the photo-thermal conversion composite phase change material in the photo-thermal conversion and heat storage layer, the light concentrated by the light concentrating layer can be subjected to photo-thermal conversion, converting light energy into heat energy, and at the same time storing the converted heat energy, realizing the coupling control of photo-thermal conversion and heat storage, avoiding the energy loss caused by the connection system between photo-thermal conversion and heat storage, and thus improving the heat storage efficiency of the photo-thermal conversion and heat storage system that can be coupled and controlled in multiple scales and multiple physical fields.

[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic structural diagram of a photo-thermal conversion and heat storage system with multi-scale and multi-physical field coupling control provided by an embodiment of the present invention;

[0022] Figure 2 Schematic structural diagram of a photo-thermal conversion and heat storage device provided by an embodiment of the present invention;

[0023] Figure 3 Schematic cross-sectional view of a Fresnel lens provided by an embodiment of the present invention;

[0024] Figure 4 Schematic structural diagram of a photo-thermal conversion and heat storage layer provided by an embodiment of the present invention;

[0025] Figure 5 Optical path diagram of a point-focusing type Fresnel lens provided by an embodiment of the present invention. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] Figure 1 Schematic structural diagram of a photo-thermal conversion and heat storage system with multi-scale and multi-physical field coupling control provided by an embodiment of the present invention. Figure 2 Schematic structural diagram of a photo-thermal conversion and heat storage device provided by an embodiment of the present invention. The embodiments of the present invention are applicable to the case of converting light energy into heat energy and storing the converted heat energy. Refer to Figure 1 and Figure 2, the photo-thermal conversion and heat storage system with multi-scale and multi-physical field coupling control includes: at least one photo-thermal conversion and heat storage device 20 embedded in the hole of the wall 10, and each photo-thermal conversion and heat storage device 20 includes a glass layer 201, a condensing layer 202, and a photo-thermal conversion and heat storage layer 203;

[0029] The condensing layer 202 is located on one side of the glass layer 201. The glass layer 201 is composed of high-transmission glass, and the condensing layer 202 is composed of a Fresnel lens;

[0030] The photo-thermal conversion and heat storage layer 203 is located on the side of the condensing layer 202 away from the glass layer 201. There is a gap between the condensing layer 202 and the photo-thermal conversion and heat storage layer 203 to form an air channel 204;

[0031] The photo-thermal conversion and heat storage layer 203 is made of a photo-thermal conversion composite phase change material, which is a material combining photo-thermal conversion function and phase change heat storage characteristics.

[0032] In the embodiment of the present invention, the high-transmission glass may refer to a glass material with a light transmittance exceeding a preset light transmittance. Among them, the preset light transmittance may be 90%. The high-transmission glass improves the light transmittance by reducing the reflectivity of the glass surface. For example, at least one layer of thin film can be coated on the glass surface, and the reflectivity of the glass surface can be reduced by controlling the thickness and structure of the thin film. Furthermore, since the glass layer 201 is composed of high-transmission glass, the reflection of light on the surface of the glass layer 201 can be reduced, thereby reducing the loss of light passing through the glass layer 201.

[0033] Reference Figure 3 , the surface of the Fresnel lens has concentric circles with different curvatures, so that the cross-section of the Fresnel lens presents a series of serrated grooves, and there is an elliptical arc at the center of the cross-section. The concentric circles with different curvatures are all equivalent to a small lens, which can adjust parallel light rays so that each circle can focus the light rays to the focal point of the Fresnel lens. The design of the Fresnel lens enables the Fresnel lens to have good optical performance, and at the same time has the characteristics of small volume and light weight, so that the Fresnel lens is easy to be designed into a large-size structure. Furthermore, since the condensing layer 202 is composed of a Fresnel lens, parallel light rays can be focused to form a light source meeting the preset radiation intensity, thereby improving the photo-thermal conversion efficiency.

[0034] The photothermal conversion composite phase change material can convert light energy into heat energy through the photothermal effect and achieve efficient heat energy storage by utilizing the phase change heat storage characteristics. The physical property parameters of the photothermal conversion composite phase change material at least include: thermal conductivity, phase change temperature, and heat storage density. Specifically, the photothermal conversion composite phase change material can selectively absorb or absorb the entire wavelength band of infrared rays in the light. When the energy of the light wave absorbed by the material matches the transition energy of the electrons in the material, the electrons are excited to jump from the ground state to a higher energy orbit. However, the excited electrons are unstable, and when they return to the ground state, they will release heat, realizing the photothermal conversion function. At the same time, the photothermal conversion composite phase change material will show a temperature rise. As the temperature increases, sensible heat storage occurs before the temperature of the photothermal conversion composite phase change material reaches the phase change temperature, and latent heat storage occurs after the temperature of the photothermal conversion composite phase change material reaches the phase change temperature. Among them, sensible heat storage depends on the temperature change of the photothermal conversion composite phase change material for heat storage, and the heat storage density is low; latent heat storage stores heat through the phase change process of the photothermal conversion composite phase change material. During the heat storage process, the temperature fluctuation is small, and the heat storage density is high. The photothermal conversion and heat storage layer 203 is made of the photothermal conversion composite phase change material, which can convert light energy into heat energy and store the converted heat energy at the same time.

[0035] Exemplarily, the photothermal conversion composite phase change material can be a eutectic solvent-based metal-carbon composite phase change material. Among them, the production process of the eutectic solvent-based metal-carbon composite phase change material includes: mixing and reacting a hydrogen bond donor and a hydrogen bond acceptor to obtain a eutectic solvent; mixing and reacting the eutectic solvent, metal oxide, and phosphoric acid to obtain a metal-carbon precursor; calcining the metal-carbon precursor in sequence to obtain a eutectic solvent-based metal-carbon matrix; and mixing the eutectic solvent-based metal-carbon matrix with a liquid phase change material for vacuum impregnation to obtain a eutectic solvent-based metal-carbon composite phase change material.

[0036] The gap formed between the concentrator layer 202 and the photothermal conversion and heat storage layer 203 can construct an air channel 204. The air channel 204 can transfer the heat energy dissipated by the photothermal conversion and heat storage layer 203 to the inside of the wall 10, realizing the effective utilization of heat energy.

[0037] Specifically, for at least one photo-thermal conversion and heat storage device 20 embedded in the opening of the wall 10, the glass layer 201 in each photo-thermal conversion and heat storage device 20 faces the outside of the wall 10, and the photo-thermal conversion and heat storage layer 203 faces the inside of the wall 10. Furthermore, the light rays irradiated onto the photo-thermal conversion and heat storage device 20 can pass through the glass layer 201, the light-concentrating layer 202, and the air channel 204 in sequence, and then be focused onto the photo-thermal conversion and heat storage layer 203. The photo-thermal conversion and heat storage function is realized by the photo-thermal conversion and heat storage layer 203 receiving the focused light rays, so that the photo-thermal conversion and heat storage device 20 can perform heat storage while realizing photo-thermal conversion, achieving photo-thermal coupling control.

[0038] As an alternative implementation manner of the embodiment of the present invention, referring to Figure 2 and Figure 4 , a heat pipe 205 is embedded inside the photo-thermal conversion and heat storage layer 203. The heat pipe 205 is designed in a serpentine structure, and the arrangement direction of the heat pipe 205 is parallel to the surface of the wall 10.

[0039] Specifically, a preset liquid can be injected into the heat pipe 205, and heat transfer is realized by using the phase change process of the preset liquid. Among them, the preset liquid can include one of pure water, ammonia, and methanol. The phase change process of the preset liquid can refer to the evaporation and condensation processes of the preset liquid. When the photo-thermal conversion and heat storage layer 203 stores heat, it will transfer the heat to the heat pipe 205, and the preset liquid in the heat pipe 205 will absorb the heat and vaporize to form steam. The steam generates pressure in the heat pipe 205 and pushes the steam to flow towards the condensed preset liquid, realizing heat transfer. The heat pipe 205 is designed in a serpentine structure, which can effectively increase the contact area between the heat pipe 205 and the photo-thermal conversion and heat storage layer 203, thereby improving the heat transfer efficiency.

[0040] As an alternative implementation manner of the embodiment of the present invention, referring to Figure 2 , the photo-thermal conversion and heat storage device 20 further includes: a vacuum insulation layer 206. The vacuum insulation layer 206 covers the first side of the photo-thermal conversion and heat storage layer 203. The first side is all sides except the second side, and the second side is the side close to the light-concentrating layer 202. The internal cavity of the vacuum insulation layer 206 is a vacuum cavity.

[0041] In the embodiment of the present invention, the second side of the photo-thermal conversion and heat storage layer 203 may refer to the side where the photo-thermal conversion and heat storage layer 203 is connected to the air channel 204. The first side of the photo-thermal conversion and heat storage layer 203 may refer to all sides of the surface of the photo-thermal conversion and heat storage layer 203 except the second side.

[0042] The interior of the vacuum insulation layer 206 can be enclosed by at least two layers of sealing materials to form a closed space, and then the air in the closed space is pumped out by a vacuum pumping device to form a vacuum cavity, which serves as the internal cavity of the vacuum insulation layer 206. To prevent the internal cavity of the vacuum insulation layer 206 from being squeezed and deformed under external pressure, a support structure can be provided between at least two layers of sealing materials. Among them, the support structure can be a support block or a support frame. By covering the first side of the vacuum insulation layer 206 on the photo-thermal conversion and heat storage layer 203, it can effectively prevent the heat energy converted by the photo-thermal conversion and heat storage layer 203 from being transferred into the wall 10, so that the photo-thermal conversion and heat storage layer 203 cannot reach the phase change temperature to generate sensible heat storage, resulting in a reduction in the heat storage efficiency of the photo-thermal conversion and heat storage layer 203.

[0043] As an alternative implementation manner of the embodiment of the present invention, the condenser layer 202 is composed of at least two Fresnel lenses, and the foci of each Fresnel lens in the at least two Fresnel lenses are all located on the photo-thermal conversion and heat storage layer 203.

[0044] In the embodiment of the present invention, the condenser layer 202 is composed of at least two Fresnel lenses, which can make the light form at least two light sources after being focused by the condenser layer 202. The distance between the condenser layer 202 and the photo-thermal conversion and heat storage layer 203 is set to be the focal length of the Fresnel lens in the condenser layer 202, that is, the thickness of the air channel 204 is equal to the focal length of the Fresnel lens in the condenser layer 202, which can make the foci of each Fresnel lens in the condenser layer 202 all located on the photo-thermal conversion and heat storage layer 203. Furthermore, the at least two light sources formed by focusing of the condenser layer 202 can be distributed on the photo-thermal conversion and heat storage layer 203, improving the photo-thermal conversion efficiency of the photo-thermal conversion and heat storage layer 203.

[0045] As an alternative implementation manner of the embodiment of the present invention, refer to Figure 5 , the Fresnel lens belongs to the point-focusing type.

[0046] In the embodiment of the present invention, the point-focusing type Fresnel lens can make the light focus on a point to form a point focus. A plurality of point-focusing type Fresnel lenses in the condenser layer 202 can be arranged in multiple rows and columns, so that the light forms a dot matrix light source after being focused by the condenser layer 202, to further improve the photo-thermal conversion efficiency.

[0047] As an alternative implementation manner of the embodiment of the present invention, refer to Figure 2 , the thickness of the vacuum insulation layer 206 is H, where 0.02m ≤ H ≤ 0.04m, which can make the vacuum insulation layer 206 avoid the heat energy converted by the photo-thermal conversion and heat storage layer 203 from being transferred into the wall 10 while reducing the manufacturing cost of the vacuum insulation layer 206.

[0048] As an alternative implementation of the embodiment of the present invention, refer to Figure 2 that the width and height dimensions of each layer in the glass layer 201, the light concentrating layer 202, and the photo-thermal conversion and heat storage layer 203 are the same.

[0049] In the embodiment of the present invention, the thickness of the photo-thermal conversion and heat storage layer 203 can be set to a first preset thickness, where the first preset thickness is used to ensure that the photo-thermal conversion composite phase change material in the photo-thermal conversion and heat storage layer 203 can complete the photo-thermal conversion and heat storage functions. Furthermore, based on the heat storage density of the photo-thermal conversion composite phase change material in the photo-thermal conversion and heat storage layer 203, the thickness of the photo-thermal conversion and heat storage layer 203, and the expected heat release amount, the width and height dimensions of the photo-thermal conversion and heat storage layer 203 can be set, where the width and height dimensions refer to the width value in the horizontal direction along the surface of the wall 10 and the height value in the vertical direction along the surface of the wall 10. By setting the width and height dimensions of the glass layer 201 and the light concentrating layer 202 to be the same as those of the photo-thermal conversion and heat storage layer 203, it can be ensured that the aggregated light covers the photo-thermal conversion and heat storage layer 203.

[0050] As an alternative implementation of the embodiment of the present invention, refer to Figure 2 that the center points of each layer in the glass layer 201, the light concentrating layer 202, and the photo-thermal conversion and heat storage layer 203 are all located on a first straight line, and the first straight line is perpendicular to the surface of the wall 10 to ensure that the light concentrated by the light concentrating layer 202 can be located in the central area of the photo-thermal conversion and heat storage layer 203, so that the photo-thermal conversion and heat storage layer 203 undergoes the maximum degree of photo-thermal conversion.

[0051] As an alternative implementation of the embodiment of the present invention, refer to Figure 2 that the first channel opening 208 of the air channel 204 is set as the air inlet, and the second channel opening 207 of the air channel 204 is set as the air outlet.

[0052] In the embodiment of the present invention, the first channel opening 208 may refer to the channel opening of the air channel 204 closest to the ground. The second channel opening 207 may refer to the channel opening of the air channel 204 farthest from the ground. The first channel opening 208 and the second channel opening 207 may both be located inside the wall 10. Furthermore, when the heat energy converted by the photo-thermal conversion and heat storage layer 203 is dissipated into the air channel 204, based on the thermal pressure, the air in the air channel 204 will automatically flow, flow in from the first channel opening 208 and flow out from the second channel opening 207, realizing the mutual flow between the air in the air channel 204 and the air inside the wall 10, thereby realizing the transfer of the heat dissipated by the photo-thermal conversion and heat storage layer 203 into the air channel 204 to the inside of the wall 10.

[0053] As an alternative implementation of the embodiment of the present invention, refer to Figure 2 andFigure 4 The photothermal conversion and heat storage device 20 further includes: a hot water tank 209, and one end of the hot water tank 209 is connected to the heat pipe 205, so as to transfer the heat energy stored in the photothermal conversion and heat storage layer 203 to the hot water tank 209 through the heat pipe 205, thereby providing stable hot water.

[0054] In the embodiment of the present invention, the multi-scale may refer to the sizes of the glass layer 201, the light concentrating layer 202 and the photothermal conversion and heat storage layer 203, and the mechanism, synthesis process and physical property parameters of the photothermal conversion composite phase change material; the multi-physical fields may refer to the light concentrating layer 202, the photothermal conversion and heat storage layer 203 and the air channel 204.

[0055] Optionally, for the photothermal conversion and heat storage device 20 provided by the embodiment of the present invention, the energy storage density test includes the following steps A1 - A4:

[0056] Step A1: Arrange thermocouples on the surface of the photothermal conversion and heat storage layer 203, and use a data acquisition instrument to record the temperature of the photothermal conversion and heat storage layer 203 at the start of the test.

[0057] Step A2: Turn on and adjust the simulated light source. After the intensity of the light emitted by the simulated light source is stable, place the photothermal conversion and heat storage device 20 within the illumination range of the simulated light source.

[0058] Step A3: Use a data acquisition instrument to monitor and record the change of the temperature of the photothermal conversion and heat storage layer 203 with time, and stop the illumination when the photothermal conversion composite phase change material completes the phase change process and the temperature reaches the equilibrium state, and record the temperature of the photothermal conversion and heat storage layer 203 at the end of the test.

[0059] Step A4: Calculate the energy storage density of the photothermal conversion and heat storage device 20 according to the following formula:

[0060] q = C p ×(T2 - T1) + ΔH;

[0061] wherein, q represents the energy storage density of the photothermal conversion and heat storage device 20, and the unit is J / kg; C p represents the specific heat capacity of the photothermal conversion composite phase change material, and the unit is J / (kg·℃); T1 represents the temperature of the photothermal conversion and heat storage layer 203 at the start of the test, and the unit is ℃; T2 represents the temperature of the photothermal conversion and heat storage layer 203 at the end of the test, and the unit is ℃; ΔH represents the phase change enthalpy value of the photothermal conversion composite phase change material, and the unit is J / kg.

[0062] Optionally, for the photothermal conversion and heat storage device 20 provided by the embodiment of the present invention, the calorific value test includes the following steps B1 - B2:

[0063] Step B1: Measure the mass of the photo-thermal conversion and heat storage layer 203.

[0064] Step B2: Calculate the calorific value of the photo-thermal conversion and heat storage device 20 according to the following formula:

[0065] Q = m × q;

[0066] where Q represents the calorific value of the photo-thermal conversion and heat storage device 20, with the unit of J; m represents the mass of the photo-thermal conversion and heat storage layer 203, with the unit of kg; and q represents the energy storage density of the photo-thermal conversion and heat storage device 20, with the unit of J / kg.

[0067] Furthermore, by changing the specific heat capacity, phase change enthalpy value of the photo-thermal conversion composite phase change material, and the irradiation intensity of the simulated light source, the energy storage density of the photo-thermal conversion and heat storage device 20 can be adjusted; by changing the mass of the photo-thermal conversion and heat storage layer 203, the calorific value of the photo-thermal conversion and heat storage device 20 can be adjusted. Exemplarily, with the specific heat capacity, phase change enthalpy value of the photo-thermal conversion composite phase change material and the mass of the photo-thermal conversion and heat storage layer 203 remaining unchanged, the energy storage density and calorific value of the photo-thermal conversion and heat storage device 20 under different irradiation intensities of the simulated light source can be obtained as shown in Table 1.

[0068] Table 1 Energy storage density and calorific value of the photo-thermal conversion and heat storage device 20 under different irradiation intensities

[0069]

[0070] The technical solution of the embodiment of the present invention can effectively reduce the reflection of light on the surface of the glass layer through the glass layer composed of high-transmission glass, thereby reducing the loss of light passing through the glass layer; through the Fresnel lens in the light concentrating layer, the light irradiated on the photo-thermal conversion and heat storage device can be focused to form a light source that meets the preset radiation intensity, so as to improve the photo-thermal conversion efficiency; through the photo-thermal conversion composite phase change material in the photo-thermal conversion and heat storage layer, the light concentrated by the light concentrating layer can be subjected to photo-thermal conversion, converting light energy into heat energy, and at the same time storing the converted heat energy, realizing the coupled control of photo-thermal conversion and heat storage, avoiding the energy loss caused by the connection system between photo-thermal conversion and heat storage, and thus improving the heat storage efficiency of the photo-thermal conversion and heat storage system that can be coupled and controlled in multiple scales and multiple physical fields.

[0071] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments, combinations with each other and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A photothermal conversion and thermal storage system with multi-scale and multi-physical field coupling control, characterized in that, The system includes at least one photo-thermal conversion and heat storage device embedded in a hole in a wall, and each photo-thermal conversion and heat storage device includes a glass layer, a condenser layer, and a photo-thermal conversion and heat storage layer; The condenser layer is located on one side of the glass layer. The glass layer is composed of high-transparency glass, and the condenser layer is composed of Fresnel lenses; The photo-thermal conversion and heat storage layer is located on the side of the condenser layer away from the glass layer, and there is a gap between the condenser layer and the photo-thermal conversion and heat storage layer to form an air channel; The photo-thermal conversion and heat storage layer is made of a photo-thermal conversion composite phase change material, and the photo-thermal conversion composite phase change material is a material combining photo-thermal conversion function and phase change heat storage characteristics.

2. The system according to claim 1, wherein Heat pipes are embedded inside the photo-thermal conversion and heat storage layer. The heat pipes are designed in a serpentine structure, and the arrangement direction of the heat pipes is parallel to the surface of the wall.

3. The system according to claim 1, wherein The photo-thermal conversion and heat storage device further includes: A vacuum insulation layer, which covers the first side of the photo-thermal conversion and heat storage layer. The first side is all sides except the second side, and the second side is the side close to the condenser layer. The internal cavity of the vacuum insulation layer is a vacuum cavity.

4. The system according to claim 1, wherein The condenser layer is composed of at least two Fresnel lenses, and the foci of each Fresnel lens in the at least two Fresnel lenses are all located on the photo-thermal conversion and heat storage layer.

5. The system according to claim 1, wherein The Fresnel lens belongs to the point-focus type.

6. The system according to claim 3, characterized in that, The thickness of the vacuum insulation layer is H, where 0.02m ≤ H ≤ 0.04m.

7. The system according to claim 1, wherein The width and height dimensions of each layer in the glass layer, the condenser layer, and the photo-thermal conversion and heat storage layer are the same.

8. The system according to claim 1, wherein The center points of each layer in the glass layer, the condenser layer, and the photo-thermal conversion and heat storage layer are all located on a first straight line, and the first straight line is perpendicular to the surface of the wall.

9. The system according to claim 1, wherein The first channel opening of the air channel is set as an air inlet, and the second channel opening of the air channel is set as an air outlet.

10. The system according to claim 2, wherein The photo-thermal conversion and heat storage device further includes: a hot water tank, which is connected to one end of the heat pipe.

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