基于火积理论的级间导热二级相变蓄热装置优化  

Entransy Analysis on Double-Stage LHS Unit with the Consideration of Heat Leakage Between Portions

作　　者：朱晔[1] 朱梦冰 汪城 李进龙 陶磊 黄维秋 ZHU Ye;ZHU Mengbing;WANG Cheng;LI Jinlong;TAO Lei;HUANG Weiqiu(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China;School of Materials Science&Engineering,Changzhou University,Changzhou 213164,China;School of Petroleum Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]常州大学材料科学与工程学院,江苏常州213164 [3]常州大学石油工程学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2021年第6期62-69,共8页Journal of Changzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51306023)。

摘　　要：相变蓄热是一种有效的热量储存方式,二级相变蓄热装置性能优于单级装置。级间导热是蓄热装置性能的影响因素之一,但在之前的研究中常被忽略。基于火积理论,对考虑级间导热的二级相变蓄热装置进行了优化分析,给出了蓄热材料的相变温度匹配准则式。和无级间导热的结果相比,入口段的相变温度降低,出口段提高。由于级间导热的存在,二级相变蓄热装置相对于单级装置的性能优势被减弱。设备传热单元数NTU较小时,相变温度匹配受到的影响较大。因此,在设计二级相变蓄热装置时,需考虑级间导热的影响,优化选取相变材料。但无需过度强调级间隔热的设计需求,尤其是在设备传热单元数NTU较少时。结果可用于对二级蓄热装置的合理设计和性能优化,也为多级装置优化研究提供参考。Latent Heat Storage(LHS)is an effective way to store thermal energy,of which double-stage LHS unit is more beneficial than single-stage unit.Heat conduction between stages is one factor influencing on performance of LHS.However,it is always neglected or over-highlighted in references.Based on entransy theory,analysis on double-stage LHS unit is conducted,with the consideration of heat leakage between portions.The criterion formulas of optimum melting temperature match is derived.It is concluded that melting temperature of Phase Change Materials(PCMs)in inlet portion increases,while that in outlet portion decreases,comparing with those in the case without consideration of heat leakage.The difference between two PCMs melting temperatures is narrowed,which implies that performance improvement by double-stage design may diminish,due to the existence of heat leakage.The effects of heat leakage on optimum melting temperature match is more significant,when number of transfer units(NTU)is at small value.However,it is also found that augment degree of entransy dissipation is not so much.Therefore,it is necessary to take into account the existence of heat leakage between portions in double-stage LHS unit,and respectively to re-construct with melting temperature match.However,it is not necessary to over-estimate the effect of heat leakage on performance deterioration,especially when NTU is at small value,because perfect heat insulation does not give much benefits on performance improvement.Results are helpful for reasonable design and performance optimization of double-stage LHS unit and are important reference to the optimization of multi-stage LHS unit under investigation.

关 键 词：火积 相变蓄热装置 优化 二级 级间导热 

分 类 号：TK02[动力工程及工程热物理]