CN202869023U - Parallel connection cavity type solar thermal collector - Google Patents

Abstract

The utility model relates to the technical field of solar photo-thermal power generation, and discloses a parallel connection cavity type solar thermal collector. The parallel connection cavity type solar thermal collector comprises a plurality of pipelines and heat absorption fins, wherein the plurality of pipelines are parallelly connected in parallel, the heat absorption fins serving as parallel groove type heat absorption cavities are closely attached to the surfaces of the pipelines, and selective absorbing coatings are coated on the surfaces of the heat absorption fins. The parallel groove heat collecting cavity structure can guarantee that the temperature on the heat exchange surface to be distributed evenly, so that heat collection and exchange efficiency of the solar thermal collector is improved. The pipelines connected in parallel are small in flow resistance, the temperature rising problem is solved through heat cycling, and manufacturing processes and heat preservation processes are simplified.

Description

Parallel cavity solar collector

technical field

The utility model relates to the technical field of solar photothermal power generation systems, in particular to a parallel cavity solar heat collector.

Background technique

Energy is the foundation of social development and human progress. With the continuous development of industry and the expansion of human needs, the energy situation is becoming increasingly tense, and green energy is considered to be a way to fundamentally solve human energy needs.

Among them, solar energy is considered to be one of the most potential new energy sources because of its unlimited "reserves", universal distribution, cleanliness and economy. The characteristics of solar thermal power generation are good adaptability to the grid, high photoelectric conversion rate, environmental protection and adjustable, etc., so it has become an important development direction of solar energy utilization.

The key to solar thermal power generation is to accumulate sunlight energy to generate the temperature and energy required for power generation. Therefore, the collector part of the solar thermal power generation system becomes the key to the entire system, which directly affects the conversion efficiency of solar thermal power and the cost of power generation. economy.

Existing solar hot water collectors have various structures, and generally can be divided into plate collectors, vacuum collector tubes and heat pipe vacuum collectors. The plate collector is cost-effective, the heat absorption and heat transfer interface is relatively flat, the energy distribution is relatively uniform, there are no hot spots in the entire interface, the overall heat transfer is relatively uniform, and the service life is long. Therefore, the plate collector occupies an important position in the solar thermal field. important position, but the plate collector has poor frost resistance and is not suitable for use in northern regions. The vacuum heat collecting tube can withstand low temperature -30 degrees Celsius, but the breakage rate of the glass pipe fittings is high, and the low temperature performance is poor, and the direct current vacuum heat collecting tube has the danger of bursting in summer. The efficiency of the heat pipe vacuum collector is better, but there is also the danger of the glass tube being easily cracked. Therefore, there is no universal and cost-effective solar collector.

Utility model content

The purpose of the utility model is to provide a novel parallel cavity solar heat collector. It has good antifreeze ability, higher heat collection and heat exchange effect and longer service life.

In order to solve the above-mentioned technical problems, the embodiment of the present utility model provides a parallel-cavity solar heat collector, including: a plurality of pipelines connected in parallel and in parallel; The heat fin has a selective absorbing coating on the surface of the heat absorbing fin.

Optionally, multiple pipelines are connected in parallel through headers.

Optionally, there are two layers of pipelines connected in parallel.

Optionally, the shape of the heat-absorbing fins that are close to the surface of the pipeline is wavy.

Optionally, the surface of the heat-absorbing fins has multiple parallel transverse partitions.

Optionally, the heat-absorbing pipeline is packaged in the casing, and a transparent cover is provided at the light-receiving part of the casing, and an anti-reflection film is laid on the transparent cover.

Optionally, the surface of the transparent cover is plane or curved.

Optionally, airgel is filled between the housing and the heat absorption coil.

Optionally, the housing is evacuated through a vacuum nozzle.

Optionally, the outer side of the pipeline outside the housing is wrapped with airgel for insulation.

Compared with the prior art, the embodiment of the utility model has the main difference and its effect in that: the parallel connection of multiple heat collecting tubes and the combination of the heat absorbing fins above the heat collecting tubes set up light traps for the incoming solar spectrum, improving the The heat collection and heat exchange efficiency of the collector. The wave-shaped heat-absorbing fins increase the contact area with the heat-collecting tubes, making the temperature distribution of the heat-exchanging surface uniform. The flow resistance of pipelines connected in parallel is small, and the problem of small temperature rise can be solved by circulating heating, and the manufacturing and heat preservation processes are simple. The vacuum cavity makes the heat preservation effect better, makes the collector have better anti-freeze ability, solves the problem of vacuum packaging of glass tubes, and prolongs the service life of the collector.

Description of drawings

Fig. 1 is a schematic structural view of a parallel cavity solar collector according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the structure of the backlight surface of a parallel cavity solar heat collector according to an embodiment of the present invention;

Fig. 3 is a schematic structural view of a parallel-cavity solar collector according to another embodiment of the present invention.

Detailed ways

In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

In order to make the purpose, technical solutions and advantages of the utility model clearer, the implementation of the utility model will be further described in detail below in conjunction with the accompanying drawings. The same or similar components in the figures are denoted by the same reference numerals.

Referring to Fig. 1 and Fig. 2, it is a structural schematic diagram of the light-receiving surface and the backlight surface of an embodiment of the parallel-cavity solar heat collector. The parallel-cavity solar collector includes: a plurality of pipelines 1, which are equidistantly arranged in parallel and distributed into two layers, and the double-layer structure can also be a multi-layer structure, which can compensate for the gap between the inner and outer coils to the greatest extent. Clearance, good assembly performance. The heat-absorbing fin 2 as a trough-type heat-absorbing chamber is arranged on the light-receiving surface of the solar collector. The heat-absorbing fin 2 is close to the surface of the pipeline 1 and has a wave shape. The wave-shaped fins form a parallel groove-type cavity. body, so that light traps are formed after light enters, so as to achieve better heat exchange effect. The surface of the heat-absorbing fin 1 is coated with a selective absorbing coating for absorbing visible spectrum of solar energy and reflecting infrared light. A plurality of parallel transverse partitions 4 are arranged above the heat-absorbing fins 1, and the transverse partitions 4 are used to reflect sunlight, so that the surface of the heat-absorbing fins 2 forms a plurality of small chamber structures, which promotes a better temperature distribution on the heat exchange surface. For uniformity, the efficiency of heat absorption and heat exchange can be further improved, and the high temperature use of the heat collector can be realized. In addition, in some other embodiments of the present invention, the transverse partition plate 4 may not be provided, and only the wave-shaped heat-absorbing fins 2 are used to achieve the effect of light trapping. The surface of the corrugated fins is provided with double-layer pipelines 1 arranged in parallel, and both ends are inserted into the header 5 and connected in parallel. The header 5 is respectively connected with the inlet main pipe 6 and the outlet main pipe 7 of the heat collector. The collectors connected in parallel simplifies the manufacturing and insulation process and helps to reduce the manufacturing cost of the collectors.

Fig. 3 shows a schematic structural view of another embodiment of the parallel-cavity solar heat collector of the present invention. The difference between this embodiment and the previous embodiment is that the combination of the pipeline 1 of the heat collector, the heat-absorbing fins 2 and the header 5 is packaged in the casing 8, and a transparent cover plate 9 is provided at the light-receiving part of the casing. An anti-reflection film is laid on the surface of the transparent cover plate 9 .

The outside of the inlet main pipe 6 and the outflow main pipe 7 on the outer side of the casing are wrapped with airgel 11 for heat preservation. The heat-absorbing coil 1 is packaged in a square casing 8, and airgel 11 is filled between the casing 8 and the pipeline 1 for heat preservation. The surface of the transparent cover 9 has a curvature, so it can withstand greater stress. An anti-reflection film is laid on the surface of the board, and the cover board can also be a plane. The housing 8 is evacuated through the vacuum nozzle 10. In addition, the outer sides of the inlet main pipe 6 and the outlet main pipe 7 can also be provided with vacuum insulation sleeves for heat preservation. Vacuum has good insulation ability, and airgel further enhances the insulation effect.

Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, those skilled in the art will understand that various changes in form and details may be made therein without Deviate from the spirit and scope of the present utility model.

Claims (10)

1. A parallel cavity solar heat collector, characterized in that, comprising: Multiple pipelines connected in parallel; The heat-absorbing fins as parallel groove heat-absorbing chambers close to the surface of the pipeline, and the surface of the heat-absorbing fins is covered with a selective absorption coating. 2. The heat collector according to claim 1, wherein the plurality of pipelines are connected in parallel through a header. 3. The heat collector according to claim 2, characterized in that, the pipelines connected in parallel are two layers. 4. The heat collector according to claim 3, characterized in that, the shape of the heat-absorbing fins that are close to the surface of the pipeline is corrugated. 5. The heat collector according to claim 4, characterized in that, the surface of the heat-absorbing fins has a plurality of parallel transverse partitions. 6 . The heat collector according to claim 5 , wherein the heat-absorbing pipeline is packaged in a casing, and a transparent cover is provided at the light-receiving part of the casing, and an anti-reflection film is laid on the transparent cover. 7. The heat collector according to claim 6, wherein the surface of the transparent cover plate is a plane or an arc. 8 . The heat collector according to claim 7 , wherein airgel is filled between the casing and the heat absorption coil. 9. The heat collector according to claim 8, characterized in that the housing is evacuated by means of a vacuum nozzle. 10 . The heat collector according to claim 9 , characterized in that, the outside of the pipeline outside the shell is wrapped with airgel for heat preservation. 11 .

Images