In-situ monitoring of energetic and hydrological performance of a semi-intensive green roof and a white roof during a heatwave event in the UK

Xing, Yangang ORCID: https://orcid.org/0000-0002-5374-7269 and Jones, Phillip ORCID: https://orcid.org/0000-0003-1559-8984 2021. In-situ monitoring of energetic and hydrological performance of a semi-intensive green roof and a white roof during a heatwave event in the UK. Indoor and Built Environment 30 (1) , pp. 56-69. 10.1177/1420326X19887218

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Abstract

Due to the increasing magnitude and high frequency of urban heatwaves, recently, there has been a surge of interest in the reflective roofs and the vegetative green roofs. Along with the rising temperature, there are also more frequent droughts and rainfall which have led to wider changes in weather conditions subsequently affecting the performance of green roofs and white roofs. However, there is still a lack of research in comparing dynamic energetic and hydrological performance of green roof and white roofs during heatwave events. This paper introduces a newly constructed outdoor test rig (installed with a semi-intensive green roof and an aluminium white roof) and a few initial monitoring results. The hydrological performance monitoring results showed that, although a noticeable peak runoff reduction of the white roof was observed, more significant water retention of green roofs had been established. The energetic performance monitoring results indicated that the green roof performed better than the white roof during the heatwave event reducing solar heat gains by 76% during day time, improving U-value by 28% and reducing indoor air temperature by 2.5°C. The peak indoor air temperature reduction in the green roof space occurred during late afternoons (around 7 pm).

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Architecture
Publisher:	SAGE Publications (UK and US)
ISSN:	1420-326X
Date of First Compliant Deposit:	26 November 2019
Date of Acceptance:	16 October 2019
Last Modified:	16 Nov 2024 11:00
URI:	https://orca.cardiff.ac.uk/id/eprint/127151

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