高温熔盐相变蓄热过程的协同强化研究

Synergy Enhancement of High Temperature Molten Salt Latent Heat Storage Performance

为提高熔盐相变蓄热性能,在强化传热管基础上,引入组合式相变材料,形成复合强化方案,并数值研究了该方案下的蓄热性能。结果表明,强化传热管和组合相变材料构成的复合强化方案,可以实现蓄热过程的整体协同强化,获得更好的强化效果。光管和单一相变材料时,熔化时间为356.4 min;内丁胞管和组合相变材料时,熔化时间为225.5 min,缩短36.7%;内圆台管和组合相变材料时,熔化时间为200.7 min,缩短43.7%;内螺纹管和组合相变材料时,熔化时间为186.4 min,缩短47.7%.合适地选择组合相变材料种类,可以在提高蓄热速率的同时,提高总蓄热量。

A new compound enhancement method was proposed to improve ~ne molten sal~ la^en~ heat storage （LHS） performance. The method is consisted of multiple phase change materials （PCMs） and enhanced tubes. Numerical studies on the LHS performance were performed for the proposed model. The results show that the compound enhancement method can achieve better overall synergy enhancement effect. For the basic case of smooth tube and single PCM, the melting time is 356.4 min. However, the melting time are 225.5 min for the case of dimpled tube and multiple PCMs, 200.7 min for the case of cone-finned tube and multiple PCMs, and 186.4 min for the case of helically-finned tube and multiple PCMs, which are reduced about 36.7%, 43.7% and 47.7% respectively. And appropriately selecting the multiple PCMs, both the LHS rate and the TES capacity can be improved.