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Research Article

A reduced-scale experiment to evaluate the thermal performance of building envelopes containing phase change material spheres

Xiaoqin Sun1( ), Jovana Jovanovic1, Siyuan Fan1, Youhong Chu1, Yajing Mo1, Shuguang Liao2
School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
Changsha Maxxom High-tech Co., Ltd, Changsha 410001, China
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Abstract

To reduce the heat transfer between outdoor and indoor environments, phase change materials (PCMs) were introduced to building envelopes. Research has shown that the position of PCMs is a key factor that influences the thermal behaviour of building envelopes containing PCMs. In the present paper, experiments were conducted to define the optimum PCM position to enhance the cooling and heating energy performance. PCMs with a melting temperature between 27 °C and 29 °C were encapsulated in spheres, arranged in an insulation layer. An electric heating film was adopted to simulate the solar radiation that was received by the outer surface of building envelopes. The thermal performance of the envelopes with PCM spheres was analysed in terms of temperature reduction and elevation, surface temperature amplitude and PCM phase transition temperature and time. With higher heating rate, the temperature reduction was higher for the PCM spheres at same positions. With same heating rate, the temperature reduction increased and then decreased when the PCM spheres moved from outdoor to indoor. The maximum temperature reduction using PCM spheres was 13.03 °C by 23.0% when the solar radiation was 200 W/m2 and the maximum temperature elevation using PCM spheres was 7.8 °C by 56.7%. The allowable thermal resistance between PCMs and outdoor environment under different heating rate was given. The PCMs are recommended to install on the inward-most layer of the wall if they can complete their melting process.

Keywords

phase change materialbuilding envelopethermal resistancephase transition temperaturetemperature reduction and elevation

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Building Simulation
Volume 12 Issue 4,
August 2019
Pages 629-640
DOI: 10.1007/s12273-019-0529-1
Cite this article:
Sun X, Jovanovic J, Fan S, et al. A reduced-scale experiment to evaluate the thermal performance of building envelopes containing phase change material spheres. Building Simulation, 2019, 12(4): 629-640. https://doi.org/10.1007/s12273-019-0529-1

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Received: 28 September 2018
Revised: 11 February 2019
Accepted: 18 February 2019
Published: 28 May 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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