A mechanical and experimental study on the heat loss of solar evacuated tube |
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| Authors: | Hui-zhong Zhao Zhen-yan Liu Min Zhang Chen Huang Li-hui Wang Zhi-jun Zou |
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| Institution: | (1) College of Urban Construction and Environment Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;(2) School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China;(3) College of Food Science and Technology, Shanghai Fisheries University, Shanghai, 200090, China |
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| Abstract: | The experimental system of heat loss of all-glass evacuated solar collector tubes (evacuated tube) is firstly designed and
constructed, which uses electric heater as thermal resource. The equilibrium temperatures are less than ±1°C during the test,
and the temperature differences of up/middle/low node in the tube are less than 1°C, 3°C, and 7°C respectively. The heat loss
of evacuated tube increases about 2.7% with vacuum state of 0.01–1 mPa, and it has the best performance at tube temperature
of 20–280°C. The invalidation tube (> 200 mPa) has the biggest heat loss that increases linearly with the tube temperature.
The evacuated tubes with the vacuum of 0.01–1 mPa are suitable for most solar adsorption refrigeration.
Foundation item: the National Natural Science Foundation of China (No. 30771245), the Innovation Program of Shanghai Municipal Education Commission
(No. 09YZ229), and the Leading Academic Discipline Project of Shanghai Municipal Education Commission (No. J50502) |
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| Keywords: | all-glass evacuated solar collector tube adsorption refrigeration vacuum state heat loss equilibrium temperature |
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