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Analytical optimization of interior PCM for energy storage in a lightweight passive solar room

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  • Xiao, Wei
  • Wang, Xin
  • Zhang, Yinping

Abstract

Lightweight envelopes are widely used in modern buildings but they lack sufficient thermal capacity for passive solar utilization. An attractive solution to increase the building thermal capacity is to incorporate phase change material (PCM) into the building envelope. In this paper, a simplified theoretical model is established to optimize an interior PCM for energy storage in a lightweight passive solar room. Analytical equations are presented to calculate the optimal phase change temperature and the total amount of latent heat capacity and to estimate the benefit of the interior PCM for energy storage. Further, as an example, the analytical optimization is applied to the interior PCM panels in a direct-gain room with realistic outdoor climatic conditions of Beijing. The analytical results agree well with the numerical results. The analytical results show that: (1) the optimal phase change temperature depends on the average indoor air temperature and the radiation absorbed by the PCM panels; (2) the interior PCM has little effect on average indoor air temperature; and (3) the amplitude of the indoor air temperature fluctuation depends on the product of surface heat transfer coefficient hin and area A of the PCM panels in a lightweight passive solar room.

Suggested Citation

  • Xiao, Wei & Wang, Xin & Zhang, Yinping, 2009. "Analytical optimization of interior PCM for energy storage in a lightweight passive solar room," Applied Energy, Elsevier, vol. 86(10), pages 2013-2018, October.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:10:p:2013-2018
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    References listed on IDEAS

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    1. Zhou, Guobing & Zhang, Yinping & Lin, Kunping & Xiao, Wei, 2008. "Thermal analysis of a direct-gain room with shape-stabilized PCM plates," Renewable Energy, Elsevier, vol. 33(6), pages 1228-1236.
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