Study on convection improvement of standard vacuum tube

2017 International Conference on New Energy and Future Energy System

He, J.H.^1 ; Du, W.P.^2 ; Qi, R.R.^3 ; He, J.X.^2

School of Physics and Electronic Sciences, Chuxiong Normal University, Chuxiong Yunnan, China^1

Solar Energy Research Institute, Yunnan Normal University, Kunming, Yunnan, China^2

ZheJiang University of Technology, Hangzhou, Zhejiang, China^3

关键词: Flat plate;    Guide plates;    Radial convection;    Theory model;    Thermal efficiency;    Vacuum tube collectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012002/pdf
DOI  :  10.1088/1755-1315/93/1/012002

来源: IOP

【 摘 要 】

For the standard all-glass vacuum tube collector, enhancing the vacuum tube axial natural convection can improve its thermal efficiency. According to the study of the standard all-glass vacuum tube, three kinds of guide plates which can inhibit the radial convection and increase axial natural convection are designed, and theory model is established. Experiments were carried out on vacuum tubes with three types of baffles and standard vacuum tubes without the improvement. The results show that T-type guide plate is better than that of Y-type guide plate on restraining convection and increasing axial radial convection effect, Y type is better than that of flat plate type, all guide plates are better than no change; the thermal efficiency of the tube was 2.6% higher than that of the unmodified standard vacuum tube. The efficiency of the system in the experiment can be increased by 3.1%.