A Parametric Investigation on Energy-Saving Effect of Solar Building Based on Double Phase Change Material Layer Wallboard

Xiaoxiao Tong,Xingyao Xiong

doi:10.1155/2018/1829298

Abstract

In order to further understand the thermal performance of the double phase change material (PCM) layer wallboard, the wallboard model was established and a comprehensively numerical parametric investigation was carried out. The variation laws of inner wall temperature rise and the heat flux transferred under different phase transition temperatures and thermal conductivities are presented in detail. The main results show that the temperature of the inside wall for case 2 can be reduced by about 1.5 K further compared to that for case 1. About 83% of the heat transferred from the outside is absorbed by the PCM layer in case 2. Reducing the phase transition temperature of the PCM layer can decrease the inside wall temperature to a certain extent in the period of high temperature. The utilization of double PCM layers shows much more performance compared to that of the single PCM layer case, and the temperature of the inside wall can be reduced by 2 K further.

Highlights

Energy demand has been increasing quickly with the development of economy
The latent heat storage has received considerable attention in comparison with the other two methods attributed to the obvious advantages of latent heat storage using phase change material (PCM), like high energy storage density and narrow operating temperature range [5, 6]
The aim of this work was to investigate a special kind of wallboard with two PCM layers attached both sides of the concrete wall for heat insulation and energy saving

Summary

Introduction

The conventional fossil energy sources such as oil, coal, and gas are limited Their use leads to climate changes and environmental pollution [1]. Building energy consumption has become a serious problem due to a large amount of energy that is consumed by the heating, ventilation, and air conditioning system of buildings every day. According to [2], about 40% of the world’s total energy was used for buildings and more than 30% of the primary energy consumed in buildings is for the heating and air conditioning system. PCM can store and release a large amount of latent heat during the process of melting and solidifying in its narrow phase transition range [7, 8]

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Findings

Discussion

Conclusion