Solidification performance analysis of bionic spider web vertical latent heat system based on response surface method optimization

Abstract

The vertical sleeve phase change heat storage unit filled with RT55 is taken as the research object. Aiming at the low thermal conductivity of phase change materials, a vertical latent heat storage sleeve (LHTES) with spider web structure optimized by response surface method is proposed to improve the solidification performance of latent heat storage system, and the phase change heat transfer process is simulated by numerical simulation method. The enhanced heat transfer characteristics of phase change material (PCM) unit in casing with different spider web fin sizes are studied. The results show that reasonably changing the fin spacing, main fin thickness and branch fin thickness of spider web shape fins can reduce PCM solidification time and evaluation temperature correspondingly, and increase the heat dissipation of LHTES. Combining PCM solidification time, heat release of LHTES and PCM average temperature as evaluation indexes, the solidification heat performance of LHTES is comprehensively analyzed, and the geometric parameters of fins are optimized by response surface method (RSM), and the optimal solution is obtained as follows: the spider web fin spacing (H) is 30.00 mm, the spider web main fin thickness (m) is 3.91 mm, and the spider web branch fin thickness (L) is 2.64 mm. Finally, the economic analysis finds that the spider web structure LHTES has high economic efficiency.