Design and Experimental Analysis of Inner-Cooling Vapor Chamber Solar Collector

doi:10.12096/j.2096-4528.pgt.21018

Abstract

Abstract:

As a kind of green and clean energy, solar energy plays a significant role in green development. To use the solar energy efficiently, a solar collector with an inner-cooling vapor chamber was designed and manufactured. The solar collector consists of the inner-cooling vapor chamber which is used as the receiver, and the multi-stage concentrator which is combined the line-focus Fresnel lens (LFL) and the compound parabolic concentrator (CPC). In addition, the designing method of the compound parabolic concentrator was proposed, its accuracy and the reliability of the solar collector were verified through the optical simulation and experiments. The results of optical simulations and experiments show that the compound parabolic concentrator manufactured according to the designing method proposed in this paper can concentrate the sunlight efficiently, with an optical efficiency of 78.42%. In the experiments where the solar collector is sealed with a transparent plastic cover, the inner-cooling vapor chamber solar collector can efficiently absorb the radiated solar energy and the air heat in the greenhouse with a high thermal efficiency of 98.94%.

Key words: inner-cooling vapor chamber, solar collector, liner-focus Fresnel lens, compound parabolic concentrator

CLC Number:

TK513

Yuhao LUO, Guodong WU, Yifan TANG, Pengfei BAI, Guofu ZHOU. Design and Experimental Analysis of Inner-Cooling Vapor Chamber Solar Collector[J]. Power Generation Technology, 2021, 42(6): 715-726.

Figures/Tables 11

Tab. 1 Parameters of line-focus Fresnel lens

参数	数值
尺寸/(mm×mm)	550×275
焦距/mm	500
纹距/mm	0.5
厚度/mm	3
透光率/%	92

Fig.1 Optical imaging principle diagram of line-focus Fresnel lens

Fig.2 Relationship between solar incident angle and various parameters

Fig.3 Optical design of CPC

Fig.4 Schematic diagram of light path simulation

Fig.5 Irradiation map of spot distribution at different solar latitude angles

Tab. 2 Parameters of inner-cooling vapor chamber

参数	数值
长度/mm	100
宽度/mm	100
高度/mm	11
侧壁厚度/mm	3.5
顶面厚度/mm	1
底面厚度/mm	1
多孔结构	由烧结铜粉制成
工作介质	去离子水
冷却介质	去离子水
材料	紫铜
冷却方式	内嵌式水冷
冷却水管直径/mm	6
冷却水管长度/mm	394
导热系数/[W/(m²∙K)]	2000

Fig.6 Schematic diagram of inner-cooling vapor chamber

Fig.7 Experimental platform of inner-cooling vapor chamber solar collector

Fig.8 Variation graph of solar direct normal irradiance and temperature of water inlet/outlet

Fig.9 Variation graph of solar direct normal irradiance and thermal efficiency of collector

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