Abstract
In this study, thermal performance of building walls integrated with phase change materials (PCM) was evaluated in terms of indoor temperature reduction and heat transfer time delay. PCM was incorporated as thin layer placed longitudinally within walls. The thermal performance of a room with and without PCM was evaluated numerically. The developed model is based on the enthalpy formulation for PCM melting and solidification, which is solved by an implicit finite difference method. The effect of PCM type on heat gain indoors was studied. Three phase change materials (n-octadecane, n-eicosane and calcium chloride hexahydrate) were tested in hot weather. Results showed that octadecane is the best in ensuring an indoor temperature close to 27 °C for the test room. Moreover, optimal thickness of the PCM layer within the walls is critical for heat transfer reduction and management and should be carefully chosen.
Highlights
Research is focusing on the optimization of energy systems
Various phase change materials (PCM) types have been explored for passive air conditioning, including hydrides, salts and their mixtures, acids, paraffin and non-paraffin
This work deals with a numerical study of the thermal behavior of walls built with construction materials used in southern city in Tunisia (Gafsa) and in which PCMs were added
Summary
Research is focusing on the optimization of energy systems. One of the ways to save energy is the passive climate control. Several researches were conducted to study the thermal behavior of the PCM room in summer. Results showed that the PCM can reduce the peak temperatures up to 1 °C and reduce the daily fluctuations It can reduce the electrical energy consumption by about 15%. Authors in [12] studied the effects of the encapsulated PCM on the thermal performance of a brick masonry wall. This work deals with a numerical study of the thermal behavior of walls built with construction materials used in southern city in Tunisia (Gafsa) and in which PCMs were added. We analyzed the influence of wall thickness and its composition as well as the effect of PCM materials on the evolution of the indoor temperature. Ben Khedher: Numerical Study of the Thermal Behavior of a Composite Phase Change Material
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