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ISSN Online: 2688-7231

ISBN Flash Drive: 978-1-56700-497-7

ISBN Online: 978-1-56700-496-0

Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)
December, 28-31, 2019, IIT Roorkee, Roorkee, India
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Study on the Behaviour of Thermal Stratification in Encapsulated PCM-based Storage System

Get access (open in a dialog) DOI: 10.1615/IHMTC-2019.1110
pages 663-668
Rudrodip Majumdar
EECP, School of Natural Sciences and Engineering, National Institute of Advanced Studies, IISc Campus, Bengaluru, India
Sandip Kumar Saha
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India

Abstract

Using the thermal stratification phenomena in storing energy in thermal energy storage is a promising technology. In this work, we have studied the effect of the addition of encapsulated PCM to enhance thermal stratification in the storage system. We have developed a numerical model based on simplified energy balance equations considering thermal non-equilibrium between encapsulated phase change material (PCM) and heat transfer fluid (HTF), devoid of complicated momentum and energy equations. The effect of the PCM bed location in the storage system and HTF flow rate on the thermal stratification performance is investigated using stratification number, Richardson number, as well as, charging and storage efficiencies for the charging phase. The HTF flow rate is found to significantly affect the thermal stratification in the storage tank. The Richardson number decreases by 400% if the HTF flow rate is doubled from 2 L/min.