Optimal research of annular baffle for heat-discharging performance of single thermal storage tank with molten salt |
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| Authors: | Cancan Zhang Yuanwei Lu Suli Shi Yuting Wu Chongfang Ma |
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| Affiliation: | Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education of China, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China |
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| Abstract: | The single thermal energy storage tank (STEST) has been extensively investigated because of the advantage of cost and efficiency. This research presents heat discharging performance of STEST using coil heat exchanger (CHE) with annular baffle at different working conditions. The heat discharging performance, flow field and temperature distribution of different parameters of the annular baffle are presented and discussed. The results show that the heat discharging time decreases with an increase inlet air velocity of the CHE. The heat discharging efficiency is up to 95.7% in this study, and the heat discharging time can reach to 18.7 hours. In addition, optimal dimensionless diameters of annular baffle are Db/Dt = 0.6, Hs/Ht = 0.075 and Hx/Ht = 0.050 (Hs is the height from the top of baffle to the top of tank. Ht is the height of the tank. Hx is the height from bottom of the baffle to the bottom of the tank). The efficiency of heat discharging process can be enhanced with optimal dimensions of the annular baffle. This study presents a direct practicable guide to design the STEST. |
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| Keywords: | annular baffle coil heat exchanger heat discharging single thermal energy storage tank |
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