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A Simplified Dynamic Model of Roof Integrated with Shape-Stabilized Phase Change Material

  • Qingchen Yang
  • Jinghua YuEmail author
  • Junchao Huang
  • Shan Peng
  • Junwei Tao
Conference paper
  • 237 Downloads
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Roof integrated with shape-stabilized phase change material (SSPCM) is composed of the PCM layer and the precast concrete hollow slab, the PCM layer is placed on the outer layer of which. During daytime in summer, the PCM absorbs and stores the solar radiation heat and releases the heat by convection and long-wave radiation at night. This can effectively reduce roof heat transfer and inner surface peak temperature. In order to study the thermal performance of the structure, a simplified dynamic thermal network model (RC model) of the roof is established. The resistances and capacitances of the PCM layer and hollow slab layer are identified by using genetic algorithm (GA). Firstly, the parameter identification of the hollow slab layer’s RC model can be obtained by matching the frequency response characteristics of the simplified model with its frequency-domain finite difference model. Another GA program is then used to find out the optimal resistances and capacitances of the PCM layer’s RC model (together with the parameters identified of the hollow slab layer) which gives the best fitting with the heat performance by using CFD numerical simulation in time domain. Further, the thermal performance of the roof integrated with shape-stabilized was investigated under a typical summer day in Wuhan. The simulation results showed that the use of PCM has helped to increase the thermal insulation of the roof, compared with the roof without PCM layer, the decrement factor is decreased by 0.31, and peak internal surface temperature is decreased by 7.02 °C when the PCM is 30 mm.

Keywords

Simplified model Phase change material Parameter identification Genetic algorithm Decrement factor 

Notes

Acknowledgements

This study is supported by the National Natural Science Foundation of China (Grant No. 51778255) and the Fundamental Research Funds of the Central Universities, HUST (Grant No. 2018KFYYXJJ131).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.School of Environmental Science and EngineeringHuazhong University of Science and TechnologyWuhanChina
  2. 2.Department of Building Services EngineeringThe Hong Kong Polytechnic UniversityHong KongChina

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