传热
机械
管壳式换热器
强化传热
传热系数
热导率
鳍
努塞尔数
管(容器)
热流密度
热阻
作者
Amin Shahsavar,Amir Hossein Majidzadeh,Roohollah Babaei Mahani,Pouyan Talebizadehsardari
标识
DOI:10.1016/j.renene.2020.11.074
摘要
Abstract This paper aims to perform the entropy analysis and thermal performance evaluation of a wavy-channels triplex-tube latent heat storage heat exchanger (LHSHE) during melting and solidification mechanisms. The system with different wave amplitudes was examined for different temperatures and Reynolds numbers of the heat transfer fluid (HTF). Water is passed in the inner and outer tubes in opposite directions and the PCM is placed in the middle tube. The heat exchanger was analyzed based on the temperature, liquid fraction and velocity of the PCM as well as thermal ( S T ‴ ) and frictional ( S f ‴ ) entropy generation rates. The results show that for a higher wave amplitude, shorter melting and solidification times are achieved. Both frictional and thermal entropy generation rates increase to the maximum values and then decrease during the melting and solidification. The frictional entropy generation rate reaches almost zero quickly during the solidification. For both melting and solidification, the magnitude of S T ‴ is significantly higher than S f ‴ in the phase change problem. The maximum values of S T ‴ are 0.05 and 0.13 W/Km3 for the melting and solidification mechanisms, respectively, for the dimensionless wave amplitude of 0.3. The results show the crucial role of entropy generation on the performance of the LHSHE.
科研通智能强力驱动
Strongly Powered by AbleSci AI