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Flat-plate solar air heat collector

An air collector and solar energy technology, applied in the field of solar heating, can solve problems such as insufficient heat exchange and high temperature, and achieve the effects of improving service life, good heat exchange effect, and enhancing heat exchange amount

Inactive Publication Date: 2018-05-29
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of insufficient heat exchange and local high temperature in conventional solar air collectors, the present invention proposes a flat-plate solar air collector

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The shape and size parameters of the flat-plate solar air collector are: the length of the shell is 2000mm, the width is 1000mm, the height is 65mm, and the dimensions of the air inlet and outlet are 250mm×50mm at the same time. The thickness of the glass cover plate is 3.2 mm, the height of the upper air flow channel is 26.2 mm, and the height of the lower air flow channel is 20 mm. The heat-absorbing plate is composed of eight aluminum-zinc plates with a length of 1890mm, a width of 112mm and a thickness of 0.32mm. The surface of the heat-absorbing plate is coated with a selective absorption coating, and the insulating layer is made of rock wool. Four spoilers are evenly distributed along the length direction of the casing, and a row of spoiler nozzles are respectively set on the spoilers on the upper and lower sides along the length direction of the spoiler, wherein the spoiler nozzles occupy an area of ​​​​on the spoiler. ratio of 60%.

[0040] The simulation test ...

Embodiment 2

[0043] The flat-plate solar air collector is simulated and analyzed using the same method and parameters as in Example 1, the only difference being that the proportion of the spoiler nozzle on the spoiler is 40%.

[0044] Obtained by CFD software simulation respectively such as Figure 5 The temperature distribution diagram of the heat sink shown as Image 6 The air flow diagram of the flow domain in the housing shown, and the air temperature of the tuyere obtained from the simulation is 62.2 ° C, and the efficiency of the flat-plate solar air collector is 64.28%.

Embodiment 3

[0046] The flat-plate solar air collector is simulated and analyzed by the same methods and parameters as in Example 1, the only difference being that the proportion of the spoiler nozzle on the spoiler is 80%.

[0047] Obtained by CFD software simulation respectively such as Figure 7 The temperature distribution diagram of the heat sink shown as Figure 8 The air flow diagram of the flow domain in the casing shown, and the air temperature of the tuyere obtained from the simulation is 62.9 ℃, and the efficiency of the flat-plate solar air collector is 64.82%.

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Abstract

The invention belongs to the technical field of solar heating, and specifically relates to a flat-plate solar air heat collector. In order to solve the problems of insufficient heat exchange and partial high temperature existing in a conventional solar air heat collector, the invention discloses a flat-plate solar air heat collector. The heat collector comprises a shell body, a heat absorption plate and a flow disturbance plate, wherein the shell body is provided with an air inlet port and an air outlet port, a heat-insulation layer is arranged at the bottom and on the four sidewalls of the shell body separately, and a glass cover plate is arranged at the top of the shell body; the heat absorption plate is located in the shell body, and arranged in parallel to the glass cover plate; the flow disturbance plate is located in the shell body, and divides an air flow channel between the air inlet port and the air outlet port into an S-shaped structure; and a flow disturbance nozzle is formed in the flow disturbance plate, and the flow disturbance nozzle penetrates through the flow disturbance plate. The flat-plate solar air heat collector disclosed by the invention is capable of increasing the heat exchange amount of air and the heat absorption plate, increasing the efficiency of the heat collector, improving the uniformity of temperature distribution of the heat absorption plate, reducing high-temperature areas and lowering the highest temperature.

Description

technical field [0001] The invention belongs to the technical field of solar heating, and in particular relates to a flat-plate solar air heat collector. Background technique [0002] The solar air collector is a commonly used solar thermal utilization device. It uses air as a heat transfer medium to transfer the collected heat to the energy supply end. It has a simple structure, low cost, and a large area for receiving solar radiation. It can be widely used. Advantages in many fields such as building heating and product drying. [0003] Among them, a solar air heat collector is disclosed in Chinese Patent Publication No. CN 204268719U. A plurality of straight glass tubes are arranged in the solar air heat collector, and a spoiler and a spoiler are arranged in the glass tubes. The spoiler is used to disturb the airflow to form a turbulent flow and improve the airflow and the wall of the straight glass tube. The heat exchange coefficient increases the airflow's ability to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S10/40F24S10/50F24S80/00
CPCY02E10/44
Inventor 张东张跃智南军虎王林军李金平李晓霞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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