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research-article

Phase Change Material Freezing in an Energy Storage Module for a Micro Environmental Control System

[+] Author and Article Information
H. Ezzat Khalifa

Fellow of ASME Syracuse University, Mechanical & Aerospace Engineering 462G Link Hall, Syracuse University, Syracuse, NY 13244, USA
hekhalif@syr.edu

Mustafa Koz

Syracuse University, Mechanical & Aerospace Engineering 462H Link Hall, Syracuse University, Syracuse, NY, 13244, USA
mkoz100@syr.edu

1Corresponding author.

ASME doi:10.1115/1.4040697 History: Received January 18, 2018; Revised June 27, 2018

Abstract

This study analyzes phase change material (PCM) freezing process in a novel latent heat storage device. Heat is removed from the PCM with an embedded evaporator. A mathematical model of freezing in a finite-thickness PCM slab is presented. An experimentally-validated reduced order model (ROM) based on the mathematical model was developed to analyze the heat transfer between the freezing PCM and an evaporating refrigerant flowing inside a flat, microchannel tube coil embedded in the PCM. A detailed finite element model of the same device was also developed and employed to verify the validity of the ROM over a wider range of conditions. The freezing times and total "cooling" stored in the PCM computed by the ROM agree very well with those computed by the detailed FEM. The ROM executes in ~1 minute for a full heat exchanger, compared with more than 10 h for the FEM, making the former much more practical for use in parametric analysis and optimization of design alternatives.

Copyright (c) 2018 by ASME
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