Comparison and Mechanism Study on the Difference of Collecting Performance of Horizontal and Vertical Evacuated Collectors

2019 2nd International Conference of Green Buildings and Environmental Management

生态环境科学

Liu, Xin^1 ; Long, Enshen^1 ; Li, Jin^1

School of Architecture and Environment, Sichuan University, Sichuan

610065, China^1

关键词: Cold area;    Evacuated collector;    Heat collection;    Heat preservation;    Mechanism studies;    Meteorological condition;    Time dimension;    Typical day;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/310/2/022079/pdf
DOI  :  10.1088/1755-1315/310/2/022079

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The evacuated collectors are applied widely in engineering for the advantages of good heat preservation and being suitable for cold areas. However, the research on its performance difference remains on some typical days, and rarely reveals the difference mechanism from different time dimensions. This paper established a mathematical model to predict the solar energy absorbed by horizontal and vertical collectors respectively, and analysed the inter-tube radiation occlusion rate under the meteorological conditions in Lhasa. The results show that except in summer, the daily and monthly heat collection of the vertical collector were higher than that of the horizontal collector, and the solar energy gained by two collectors was close in winter. The horizontal collector was not affected by the inter-tube occlusion while the vertical collector was seriously affected. The horizontal collector was recommended in Lhasa.