Performance comparison of a group of thermal conductivity enhancement methodology in phase change material for thermal storage application

RENEWABLE ENERGY

卷:97

Article

Abujas, Carlos R.¹  Jove, Aleix¹  Prieto, Cristina¹  Gallas, Manuel¹  Cabeza, Luisa F.² 

[1] Abengoa Res, C Energia Solar 1, Seville 41014, Spain

[2] Univ Lleida, GREA Innovacio Concurrent, Edifici CREA,C Pere Cabrera S-N, Lleida 25001, Spain

关键词: Thermal energy storage (TES);    Phase change material (PCM);    Thermal conductivity enhancement (TCE);    High temperature;    Foam;    Fined tubes;   

DOI  :  10.1016/j.renene.2016.06.003

来源: Elsevier

【 摘 要 】

Phase change materials (PCM) are able to store thermal energy when becoming liquids and to release it when freezing. Recently the use of PCM materials for thermal energy storage (TES) at high temperature for Concentrated Solar Power (CSP) technology has been widely studied. One of the main investigated problems is the improvement of their low thermal conductivity. This paper looks at the current state of research in the particular field of thermal conductivity enhancement (TCE) Mechanisms of PCM to be used as TES. This work considers a numerical approach to evaluate the performance of a group of TCE solutions composed by particular configurations of two of the principal TCE systems found on the literature:. finned pipes and conductive foams. The cases are compared against a single PCM case, used as reference. Three different grades of graphite foams have been studied, presenting a charge time 100 times lower than the reference case for the same capacity. For fins two materials are analyzed: carbon steel and aluminum. The charge times of fin cases are from 3 to 15 times faster, depending on the amount and type of material employed. The internal mechanisms are analyzed to understand the results and locate possible improvement. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free