OPTIMUM LAYOUT OF MOLTEN SALT SINGLE TANK DOUBLE COIL HEAT RELEASING HEAT EXCHANGER

Kong Qinglong; Lu Yuanwei; Yu Qiang; Zhang Cancan; Wu Yuting

doi:10.19912/j.0254-0096.tynxb.2020-1388

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (8) : 209-215. DOI: 10.19912/j.0254-0096.tynxb.2020-1388

OPTIMUM LAYOUT OF MOLTEN SALT SINGLE TANK DOUBLE COIL HEAT RELEASING HEAT EXCHANGER

Kong Qinglong, Lu Yuanwei, Yu Qiang, Zhang Cancan, Wu Yuting

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Abstract

The molten salt single-tank thermal storage heating system is a low-cost clean energy heating mode that realizes heat storage by built-in electric heaters and heat release by built-in coil heat exchangers. The built-in coil heat exchanger area of this system increases with the increase of heating load, which leads to the arrangement of the coil heat exchanger directly affects the heat release performance of the single tank heat storage system. In order to obtain the best arrangement of coil heat exchanger in a single tank, this paper investigates the effect of different coil heat exchanger arrangements with the same heat exchanger area on the heat release performance of the single tank heat storage system by using numerical calculation method. The results show that the heat release performance of the staggered double spiral coil heat exchanger is better than that of the single row coil heat exchanger, and the capacity, discharge temperature and accumulated heat release are the largest for the arrangement with high inner coil and low outer coil （h_i=90 mm, h_o=174 mm）. The results of this paper provide a theoretical basis for the design of heat exchanger with electrically heating molten salt single tank heat storage.

Key words

convection / heat transfer / molten salt / single tank / coil heat exchanger / heating

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Kong Qinglong, Lu Yuanwei, Yu Qiang, Zhang Cancan, Wu Yuting. OPTIMUM LAYOUT OF MOLTEN SALT SINGLE TANK DOUBLE COIL HEAT RELEASING HEAT EXCHANGER[J]. Acta Energiae Solaris Sinica. 2022, 43(8): 209-215 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1388

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