Determination of enthalpy-temperature-composition relations in incongruent-melting phase change materials

作者：Desgrosseilliers Louis; Allred Paul; Groulx Dominic; White Mary Anne^*

来源：Applied Thermal Engineering, 2013, 61(2): 193-197.

DOI：10.1016/j.applthermaleng.2013.07.019

• Phase change materials
• Latent heat energy storage systems
• Binary phase diagrams
• T-history
• Sodium acetate trihydrate
• Incongruent melting

This paper demonstrates that liquidus line (T-x) data can be obtained from calorimetric determinations of phase transition enthalpy profiles (H-T) for incongruent-melting phase change materials (PCMs) more efficiently than using traditional cooling curves. An accurate and reliable equilibrium mixture enthalpy model bridges the H-T and T-x gap to provide a full suite of high density H-T-x data to assist latent heat energy storage researchers to evaluate composition-dependent two-phase equilibrium processes. The proposed method is validated for T-history method H-T determinations of 1:1 diluted sodium acetate trihydrate in water, and can also be used with other laboratory calorimetric techniques used to determine the phase transition enthalpy profiles of incongruent-melting compounds.

• 出版日期2013-11-3