Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study

Article

Alam, Morshed, Sanjayan, Jay, Zou, Patrick X.W., Ramakrishnan, Sayanthan and Wilson, John. 2017. "Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study." Energy and Buildings. 148, pp. 238-256. https://doi.org/10.1016/j.enbuild.2017.05.018
Article Title

Evaluating the passive and free cooling application methods of phase change materials in residential buildings: A comparative study

ERA Journal ID4185
Article CategoryArticle
AuthorsAlam, Morshed, Sanjayan, Jay, Zou, Patrick X.W., Ramakrishnan, Sayanthan and Wilson, John
Journal TitleEnergy and Buildings
Journal Citation148, pp. 238-256
Number of Pages19
Year2017
PublisherElsevier
Place of PublicationNetherlands
ISSN0378-7788
1872-6178
Digital Object Identifier (DOI)https://doi.org/10.1016/j.enbuild.2017.05.018
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0378778816319545
AbstractThe integration of Phase Change Materials (PCMs) in buildings as a potential method to improve indoor thermal comfort can be achieved via three different approaches: passive, active and free cooling. Previous studies on the thermal performance enhancement using these methods revealed that all three methods can improve the energy efficiency or indoor thermal comfort of a building significantly. However, there is no study available in the literature comparing the effectiveness of different PCM application methods. Such comparative analysis is important to understand which application method would be best for increasing the energy efficiency and thermal comfort of a particular building type. The aim of the present study is to compare and analyze the effectiveness of passive and free cooling application methods of PCM in a residential building in Melbourne, Australia. The passive application method utilizes a macro-encapsulated PCM, so-called BioPCM mats, installed in the ceilings of the building. In free cooling, outdoor air was supplied to the indoor after passing it through a PCM containing heat exchanger. The comparative study was carried out using validated numerical models for both application methods. The simulation models were developed using building simulation software EnergyPlus V8.3 and computational fluid dynamics (CFD) software ANSYS V15.1. The results showed that, for the studied building, free cooling application of PCM is more effective than the passive application in reducing the indoor zone temperature. During the studied period of seven days, passive application of 25°C PCM resulted in up to 0.44°C reduction in peak indoor zone temperature compared to 2.63°C reduction in the free cooling application which is about six times of the reduction in passive case. Despite the use of several supporting strategies to improve the performance of passive PCM application, its effectiveness in reducing the peak zone temperature was always found to be lower than the free cooling method. Parametric studies showed that the optimum PCM temperature should be carefully chosen based on the application method as free cooling and passive cooling methods are influenced by outdoor air temperature and indoor zone temperature respectively.
KeywordsPhase change materials; Passive cooling; Heat exchanger; Free cooling; Building thermal simulation; Computational fluid dynamics
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsSwinburne University of Technology
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