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Research Article

Numerical study on cooling performance of a ventilated Trombe wall with phase change materials

Xiaohong Liu1,3,5, Yuekuan Zhou2,3,4( ), Guoqiang Zhang1,2,3
College of Architecture, Hunan University, Changsha, Hunan 410082, China
College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China
National Center for International Research Collaboration in Building Safety and Environment, Hunan University, Changsha, Hunan 410082, China
Department of Building Services Engineering, Faculty of Construction and Environment, The Hong Kong Polytechnic University, Hong Kong, China
Hunan University Design Institute Co., LTD, Changsha, Hunan 410082, China
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Abstract

This study aims to evaluate thermal performance of a new ventilated Trombe wall integrated with phase change materials (PCMs-VTW). Double PCM wallboards are embedded in the building facade for different purposes, i.e. exterior PCM wallboard is to store natural cooling energy via night-time ventilation, and interior active PCM wallboard is for radiant cooling. Melting temperature and latent heat of PCM have been discussed for PCMs-VTW system from 1st August to 7th August in Changsha, China. Also, high-reflective coating is coated on the exterior PCM wallboard for reflecting solar radiation, thus ameliorating daytime overheating. Nighttime ventilation is for natural cooling energy storage via regenerating solid exterior PCM wallboard. The obtained result shows that under the weather condition in Changsha, melting temperature 22 °C for interior PCM and the latent heat 176 kJ/kg for exterior PCM show considerable benefit for cooling energy release. Compared with the classical Trombe wall system, annual cooling energy consumption is decreased by 20.8% and by 18.6% in the PCMs-VTW system when indoor air temperature is kept at 22 °C and 24 °C respectively. Our research has provided scientific evidences for potentials provided by PCMs-VTW system in reducing building energy consumption and improving indoor thermal comfort via exploiting natural cooling energy, mitigating overheating at summer condition and utilizing cold sources in high temperature.

Keywords

phase change materialventilationTrombe wallcooling energy storagehigh-reflective coating

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Building Simulation
Volume 11 Issue 4,
August 2018
Pages 677-694
DOI: 10.1007/s12273-018-0434-z
Cite this article:
Liu X, Zhou Y, Zhang G. Numerical study on cooling performance of a ventilated Trombe wall with phase change materials. Building Simulation, 2018, 11(4): 677-694. https://doi.org/10.1007/s12273-018-0434-z

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Received: 02 August 2017
Revised: 16 January 2018
Accepted: 22 January 2018
Published: 10 February 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018
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