Characteristics of Phase Change Materials and Analysis of Thermal Properties

doi:10.12068/j.issn.1005-3026.2023.04.007

Abstract

Abstract: Phase change materials (PCMs) are the core media of energy storage for latent heat storage. Thus， screening of appropriate PCMs needs to take into consideration a variety of factors， whereas phase transition temperature， energy storage density and thermal conductivity are the most critical factors during assessment of feasibility for PCMs. As evident by summarizing and comparing the characteristics of different categories of typical solid-liquid PCMs， multi-high-performance compatible composite materials is the development direction for PCMs’ applications. Finally， based on the theoretical analysis， it concluded as that within the range of specified working temperature difference of 50℃， the heat storage density per unit mass of common PCMs is no longer correlated with it’s phase transition temperature when latent heat is ≥100kJ/kg， and the higher of phase transition temperature of PCMs is， the wider range of the effective output temperature can be obtained by the system， and more flexible output of system becomes. The larger the latent heat of PCMs is， the more stable the heat discharging efficiency of the system is while varying the effective temperature. Therefore， within the temperature difference of 50℃， the thermal energy storage system gains rather superior output performance with selection of PCMs under considering of it’s higher latent heat， competitive average solid-liquid specific heat and higher phase transition temperature.

Key words: latent heat; phase change materials (PCMs); heat storage density; phase transition temperature; efficiency

CLC Number:

TK02

WUSIMAN Kuerbanjiang， DAI Xiao-ye， SHI Lin. Characteristics of Phase Change Materials and Analysis of Thermal Properties[J]. Journal of Northeastern University(Natural Science), 2023, 44(4): 510-516.

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