Collecting performance of an evacuated tubular solar high-temperature air heater with concentric tube heat exchanger

被引：31
作者：
Wang, Ping-Yang [1 ]
Li, Shuang-Fei [1 ]
Liu, Zhen-Hua [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai 200240, Peoples R China
来源：
ENERGY CONVERSION AND MANAGEMENT | 2015年 / 106卷
基金：
中国国家自然科学基金;
关键词：
Solar collector; All-glass evacuated tube; Air heater; CPC; THERMAL PERFORMANCE; DESIGN; SINGLE;
D O I：
10.1016/j.enconman.2015.10.058
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A set of evacuated tube solar high temperature air heaters with simplified CPC (compound parabolic concentrator) and concentric tube heat exchanger is designed to provide flow air with a temperature of 150-230 degrees C for industrial production. The solar air heater system consists of 30 linked collecting units. Each unit includes a simplified CPC and an all-glass evacuated tube absorber with a concentric copper tube heat exchanger installed inside. A stainless steel mesh layer with high thermal conductivity is filled between the evacuated tube and the concentric copper tube. Air passes through each collecting unit, and its temperature increases progressively. An experimental investigation of the thermal performance of the air heater is performed, and the experimental results demonstrate the presented high-temperature solar air heater has excellent collecting performance and large output power, even in the winter. The measured thermal efficiency corresponding to the air temperature of 70 degrees C reaches 0.52. With the increase of air temperature, thermal efficiency reaches 0.35 at an air temperature of 150 degrees C, and 0.21 at an air temperature of 220 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1166 / 1173
页数：8
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