Liu, Bai-hong, Gao, Wen-feng, Liu, Tao, Lin, Wen-xian, Xing, Xiu-lan, and Hu, Xia-fang (2015) Numerical simulation and analysis on stagnation performance of all—glass evacuated collector tubes. Journal of Yunnan Normal University, 35 (4). pp. 5-10.

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Abstract

In this paper, FLUENT has been used to simulate and analyze the stagnation performance of all—glass evacuated tubes, which size is 58x1 800mm, with different emittance and vacuum degree. In addition, the accuracy of numerical simulation is also verified through test. The numerical simulation results show that a lower emittance will lead to smaller heat loss and better thermal performance of all—g1ass vacuumed tubes. What's more, the stagnation performance of all—glass evacuated tube decreases with the increase of the air pressure in the vacuum jacket. The stagnation change of all—glass evacuated tube is mainly in the range of 0.1~10 Pa. When the air pressure is lower than 10 -1 Pa or greater than 10 Pa, the thermal performance change caused by heat conduction loss of air in the vacuum jacket is not obvious. Therefore the vacuum degree of air jacket should be maintained in the order of 10 -2 Pa in order to guarantee good thermal performance of all-glass evacuated tube.

Item ID:	43643
Item Type:	Article (Research - C1)
ISSN:	1007-9793
Keywords:	emittance; vacuum degree; heat loss coefficient; stagnation parameter
Funders:	National Natural Science Foundation of China (NNSFC)
Projects and Grants:	NNSFC 51266016, NNSFC 51469035
Date Deposited:	12 Apr 2016 00:05
FoR Codes:	09 ENGINEERING > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations @ 60% 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091501 Computational Fluid Dynamics @ 40%
SEO Codes:	85 ENERGY > 8505 Renewable Energy > 850506 Solar-Thermal Energy @ 100%
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