Melting and Solidification Characteristic of Mixture of Two Types of Latent Heat Storage Material in Direct Contact Heat Exchanger

Abstract

ABSTRACT The aim of this study is to develop a latent heat storage system designed to utilize waste heat from industrial processes in the mid-temperature range of 100–200°C. Mannitol and a mixture of mannitol and erythritol, both classified as sugar alcohols, were utilized as phase change materials in this study. The present study investigated the melting and solidification characteristics of the mixture of C M = 70mass% (with a composition of 70% mannitol and 30% erythritol by mass) for latent heat storage at approximately 150°C. Additionally, the study aims to experimentally establish the thermal performance of the mixture of C M = 70mass% in a direct contact heat exchanger during melting and solidification. Comparative analysis with mannitol was conducted to determine the melting and solidification behavior of the mixture of C M = 70mass%. Moreover, the heat transfer characteristics, including heat storage and heat release speed, were investigated. Finally, the heat transfer mechanism of each phase change material (PCM) was considered through the overall heat transfer rate. keyword : Phase change material(PCM), Direct contact heat exchanger, Mixture of C M =70mass%, melting & soidification behaviors, Overall coefficient of heat transfer.