Box type concentrated solar energy medium-temperature heat collector

Abstract

The utility model belongs to solar heating technology field, specifically disclose a box body light -concentrating type solar medium temperature heat collector, the utility model discloses a sealed box body of one side glass cover, the bottom and the side surface of box body are equipped with heat preservation layer, be equipped with upper flow collecting pipe and lower flow collecting pipe in the box body, be equipped with at least two fin heat absorption unit between heat preservation layer and glass cover, the both ends of fin heat absorption unit are connected with the upper flow collecting pipe and lower flow collecting pipe of the intercommunication box body respectively, fin heat absorption unit includes fin adsorption pipe and reflector, and fin adsorption pipe sets up at the light -concentration of reflector surface. The utility model discloses the synergistic effect of metal light -concentrating structure and straight -through type flow channel design, can realize the stable output of medium temperature, improve the pressure intensity of system output, improved the reliability of medium temperature pressure bearing. The utility model can be widely applied to the light -heat conversion field of solar energy.

Description

Technical Field

[0001] This utility model belongs to the field of solar heating technology and relates to a box-type concentrating solar medium-temperature collector. Background Technology

[0002] Solar collectors are devices that use optical reflection or refraction principles to focus solar radiation energy to generate heat. Conventional flat-plate collectors operate at relatively low temperatures; when the output medium temperature exceeds 150°C, system efficiency drops significantly due to increased radiation and convection heat losses, making it difficult to meet the medium- and high-temperature heating demands of industrial applications. These technological bottlenecks limit the large-scale application of solar thermal energy in industrial settings.

[0003] Current mainstream solar collector systems use a combination of "all-glass vacuum collector tubes + U-shaped metal tubes". The U-shaped metal tubes, due to their tortuous flow channels, increase hydraulic resistance by 30%-50%, requiring a high-power circulation pump. Glass vacuum tubes suffer from high breakage rates during transportation (approximately 5%-8%) and the risk of freezing and cracking in winter, resulting in high maintenance costs. More importantly, the system's pressure resistance is typically below 0.6 MPa, making it difficult to meet the pressure stability requirements of centralized heating systems and unsuitable for high-temperature, unheated operation, severely restricting the large-scale deployment of such systems.

[0004] Therefore, a medium-temperature solar collector is needed that combines medium-temperature output, low pressure loss, and high reliability to improve the output temperature and withstand pressure, and ensure the reliability of the equipment under medium-temperature pressure. Summary of the Invention

[0005] The purpose of this utility model is to provide a box-type concentrating solar collector for medium temperature, which, through the synergistic effect of a metal concentrating structure and a straight-through flow channel design, can achieve stable output at medium temperature, improve the pressure resistance of the output, and enhance the reliability of medium-temperature pressure resistance.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A box-type concentrating solar medium-temperature collector includes a sealed box with a glass cover on one side, an insulation layer on the bottom and sides of the box, an upper flow manifold and a lower flow manifold inside the box, and at least two finned heat absorption units between the insulation layer and the glass cover.

[0008] The two ends of the finned heat absorption unit are respectively connected to the upper and lower flow manifolds inside the communicating box.

[0009] The finned heat absorption unit includes a finned adsorption tube and a reflective mirror, with the finned adsorption tube positioned at the light-concentrating point of the reflective mirror.

[0010] As a limitation, the finned heat-absorbing tube includes heat-absorbing pipes and heat-absorbing fins with a heat-absorbing coating sprayed on their surface;

[0011] The heat-absorbing fins are cylindrical tubes with openings on the sides. The length of the openings is the same as the length of the cylindrical tubes. The openings of the heat-absorbing fins face the glass cover plate, and the heat-absorbing pipes are located at the bottom inside the heat-absorbing fins.

[0012] As a second limitation, the insulation layer is divided into an inner insulation layer and an outer insulation layer, with an air layer between the inner insulation layer and the outer insulation layer.

[0013] As a further limitation, a reflective heat insulation layer is attached to the inside of the outer insulation layer, with the reflective heat insulation layer facing the inner insulation layer.

[0014] As a further limitation, the inner insulation layer material is aluminum silicate fiber, and the outer insulation layer material is polyurethane.

[0015] Preferably, the inner insulation layer material is aluminum silicate fiber, and the outer insulation layer material is polyurethane.

[0016] As a third limitation, the glass cover is a double-layered glass cover, with an anti-reflective layer provided on the inner side of the outer glass cover.

[0017] The technological advancements achieved by this invention compared to existing technologies, due to the adoption of the aforementioned technical solution, are as follows:

[0018] (1) This utility model adopts a combination structure of finned heat absorption unit and reflective mirror surface. The solar radiation energy is concentrated efficiently on the finned heat absorption tube through optical focusing, and further conducted to the heat transfer medium in the tube through the finned heat absorption tube to achieve medium temperature output, breaking through the temperature limit of conventional flat plate collectors. At the same time, the straight flow channel design avoids the tortuous structure of U-shaped tube, reduces hydraulic resistance by more than 30%, and reduces the energy consumption of the circulating pump.

[0019] (2) This utility model adopts heat-absorbing fins with an open circular tube structure. The opening of the heat-absorbing fins faces the glass cover plate, which can efficiently capture transmitted solar radiation and enhance the light absorption rate through multiple reflections on the inner wall, thereby improving the photothermal conversion efficiency. The open design, combined with the reflective mirror, forms a secondary focusing effect, which improves the uniformity of the energy flux density distribution on the surface of the heat-absorbing tube and avoids material stress damage caused by local overheating. At the same time, the heat-absorbing tube is located at the bottom of the fins and forms a non-closed cavity structure with the fins. This not only expands the heat exchange area through the fins, but also uses the cavity effect to suppress convective heat loss, so that the working temperature is stably maintained in the range of 180-250℃. The overall structure adopts a metal integrated molding process, which greatly improves the pressure bearing capacity and solves the pain point of insufficient pressure bearing capacity of traditional vacuum tube systems.

[0020] (3) This utility model adopts a double-layer insulation structure. The inner insulation layer of aluminum silicate fiber directly contacts the high-temperature area. Its low thermal conductivity effectively blocks the heat from being conducted to the box. The outer insulation layer of polyurethane blocks the heat exchange with the environment, which significantly reduces heat loss. The middle air layer forms an insulation buffer zone, which further suppresses the thermal bridge effect through the low convection characteristics of air and maintains the temperature difference between the inside and outside of the box. At the same time, the high temperature resistance of aluminum silicate fiber ensures the stability of the system under 250℃ conditions. The reflective layer provided on the inner side of the polyurethane outer insulation further reduces the outward spread of the temperature of the air layer. The closed-cell structure solves the problem of moisture failure of traditional rock wool.

[0021] (4) This utility model adopts a double-layer glass cover plate with an anti-reflection layer. The sealed air layer formed by the double-layer glass can reduce the thermal conductivity and significantly reduce heat loss compared with single-layer glass. The anti-reflection layer on the inner side of the outer glass can reduce the reflectivity of the glass surface, increase the transmittance of sunlight, and significantly enhance the optical efficiency of the collector. The inner glass acts as a secondary barrier to prevent the anti-reflection film from getting damp and oxidizing under extreme weather conditions, thus extending the life of the film. The double-layer structure improves the wind pressure resistance of the equipment, while the hollow layer can effectively buffer thermal stress and avoid the risk of cracking caused by sudden cooling and heating of single-layer glass.

[0022] This utility model belongs to the field of solar heating technology. Through the synergistic effect of metal concentrating structure and straight-through flow channel design, it can achieve stable output at medium temperature, improve the pressure resistance of the output, and improve the reliability of medium-temperature pressure resistance. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the finned heat absorption unit in an embodiment of this utility model.

[0028] In the diagram: 1. Box body, 2. Support frame, 3. Glass cover, 4. Insulation layer, 5. Finned heat absorption unit, 6. Upper flow manifold, 7. Lower flow manifold, 8. Reflective mirror, 9. Heat absorption pipe, 10. Heat absorption fins. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] Example 1: A box-type concentrating solar collector with medium temperature.

[0031] This embodiment describes a box-type concentrating solar collector with medium temperature, such as... Figure 1 and Figure 2 As shown, the enclosure includes a sealed box 1 with a glass cover 3 on one side. An upper flow manifold 6 and a lower flow manifold 7 are provided on the side of the box 1, connecting the inside and outside of the box 1. A support bracket 2 is provided below the box 1 to support it. Inside the box 1, an insulation layer 4 is laid on the bottom and sides. Three finned heat absorption units 5 are arranged within the space formed by the insulation layer 4. The two ends of each finned heat absorption unit 5 are connected to the upper flow manifold 6 and the lower flow manifold 7, respectively.

[0032] like Figure 3 As shown, each finned heat absorption unit 5 includes a finned adsorption tube and a reflective mirror 8. The finned adsorption tube is positioned at the focusing point of the reflective mirror 8. The finned adsorption tube includes a heat absorption pipe 9 and heat absorption fins 10 with a heat absorption coating sprayed on their surface. The heat absorption fins 10 are semi-circular tubes with openings on their sides, the length of which is the same as the length of the semi-circular tube. The openings of the heat absorption fins 10 face the glass cover plate 3, and the heat absorption pipe 9 is located at the bottom inside the heat absorption fins 10.

[0033] To improve the heat retention effect in this embodiment, the insulation layer 4 is a composite insulation layer, consisting of an inner insulation layer and an outer insulation layer, with an air layer between them. This air layer design creates a cavity in the composite insulation layer, giving it higher insulation properties than ordinary insulation materials. Furthermore, this embodiment includes a reflective heat insulation layer attached to the inner side of the outer insulation layer, facing towards the inner insulation layer, further enhancing the heat retention effect of the insulation layer 4.

[0034] In this embodiment, the inner insulation layer material of the combined insulation layer is aluminum silicate fiber, and the outer insulation layer material is polyurethane.

[0035] To further improve the heat-concentrating effect of this embodiment, the glass cover plate 3 is a double-layer glass structure. The glass cover plate 3 has an anti-reflection layer on the inner side of the outer glass cover plate, which can reduce the thermal conductivity and improve the heat preservation performance of this embodiment.

[0036] In this embodiment, the bracket 2 supports one end of the housing 1, ensuring that the glass cover 3 of the housing 1 faces the sun and is perpendicular to the sunlight at midday. The heat-absorbing pipe 9, the upper guide manifold 6, and the lower guide manifold 7 are filled with a high-temperature resistant heat-conducting medium. Sunlight passes through the glass cover 3, and under the focusing effect of the reflective mirror 8, heat is absorbed by the heat-absorbing fins 10 with a coating sprayed onto their surface, and the heat is transferred to the heat-conducting medium inside the heat-absorbing pipe 9, heating the medium before it is output for application.

[0037] In this embodiment, the number of finned heat absorption units 5 is three, but it can be changed according to the actual situation, as long as the number of finned heat absorption units 5 is at least two.

Claims

1. A box-type concentrating solar collector for medium temperature, comprising a sealed box with one side covered by a glass cover, insulation layers on the bottom and sides of the box, and an upper and lower flow guide pipe inside the box, characterized in that, At least two finned heat absorption units are provided between the insulation layer and the glass cover plate; The two ends of the finned heat absorption unit are respectively connected to the upper and lower flow manifolds inside the communicating box. The finned heat absorption unit includes a finned adsorption tube and a reflective mirror, with the finned adsorption tube positioned at the light-concentrating point of the reflective mirror.

2. A box-type concentrating solar collector with medium temperature according to claim 1, characterized in that, The finned heat-absorbing tube includes heat-absorbing pipes and heat-absorbing fins with a heat-absorbing coating sprayed on their surface. The heat-absorbing fins are cylindrical tubes with openings on the sides. The length of the openings is the same as the length of the cylindrical tubes. The openings of the heat-absorbing fins face the glass cover plate, and the heat-absorbing pipes are located at the bottom inside the heat-absorbing fins.

3. A box-type concentrating solar collector with medium temperature according to claim 1 or 2, characterized in that, The insulation layer is divided into an inner insulation layer and an outer insulation layer, with an air layer between the inner and outer insulation layers.

4. A box-type concentrating solar collector with medium temperature according to claim 3, characterized in that, A reflective heat insulation layer is attached to the inside of the outer insulation layer, with the reflective heat insulation layer facing the inner insulation layer.

5. A box-type concentrating solar collector with medium temperature according to claim 3, characterized in that, The inner insulation layer is made of aluminum silicate fiber, and the outer insulation layer is made of polyurethane.

6. A box-type concentrating solar collector with medium temperature according to claim 4, characterized in that, The inner insulation layer is made of aluminum silicate fiber, and the outer insulation layer is made of polyurethane.

7. A box-type concentrating solar collector with medium temperature according to any one of claims 1, 2, 4, 5 or 6, characterized in that, The glass cover is a double-layered glass cover, with an anti-reflective layer provided on the inner side of the outer glass cover.

8. A box-type concentrating solar collector with medium temperature according to claim 3, characterized in that, The glass cover is a double-layered glass cover, with an anti-reflective layer provided on the inner side of the outer glass cover.

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