Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/8618
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dc.contributor.authorKolokotroni, M-
dc.contributor.authorGowreesunker, BL-
dc.contributor.authorGiridharan, R-
dc.date.accessioned2014-07-14T10:02:28Z-
dc.date.available2014-07-14T10:02:28Z-
dc.date.issued2013-
dc.identifier.citationEnergy and Buildings, 67, 658 - 667, 2013en_US
dc.identifier.issn0378-7788-
dc.identifier.otherhttp://www.sciencedirect.com/science/article/pii/S0378778811003136-
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/8618-
dc.descriptionThis is the post-print version of the final paper published in Journal of Energy and Buildings. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 2011 Elsevier B.V.en_US
dc.description.abstractOne of the primary reasons for the application of cool materials is their energy and associated environmental impact on the built environment. Cool materials are usually applied on the roof of buildings to reduce cooling energy demand. The relative benefits of this reduction depend on the construction of the building, external weather conditions and use of the building. This paper examines the impact from the application of a reflective paint on a flat roof in a naturally ventilated office building in the area of London, UK where the climate is moderate with high heating demand by buildings. The environmental conditions (internal/external air and surface temperatures) of the building were monitored before and after the application of the cool roof during the summer. It was found that internal temperatures were reduced after the application of the cool roof. The building was modelled using TRNSYS and the model was calibrated successfully using the measurements. A parametric analysis was carried out by varying the reflectivity and insulation of the roof and ventilation rate; the heating and cooling demand for a year was calculated using the Summer Design Year for London as the weather file. It was found that cooling demand is significantly reduced, heating demand is increased and the total energy savings vary between 1 and 8.5% relative to an albedo of 0.1 for the same conditions. In free floating (naturally ventilated) buildings summer comfort is improved but there is a penalty of increased heating energy during the winter. Thermal comfort can be improved by an average of 2.5 °C (operative temperature difference for a change of 0.5 in albedo) but heating demand could be increased by 10% for a ventilation rate of 2 air changes per hour. The results indicate that in the case of temperate climates the type, operation and thermal characteristics of the building should be considered carefully to determine potential benefits of the application of cool roof technology. For the examined case-study, it was found that a roof reflectivity of 0.6–0.7 is the optimum value to achieve energy savings in a cooled office, improve summer internal thermal conditions in a non-cooled office (albeit with some heating energy penalty). It indicates that it is a suitable strategy for refurbishment of existing offices to improve energy efficiency or internal environmental conditions in the summer and should be considered in the design of new offices together with other passive energy efficient strategies.en_US
dc.description.sponsorshipIntelligent Energy Europe (IEE)en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectCool roofen_US
dc.subjectEnergy consumptionen_US
dc.subjectModerate climateen_US
dc.subjectBuilding coolingen_US
dc.subjectBuilding heatingen_US
dc.titleCool roof technology in London: An experimental and modelling studyen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1016/j.enbuild.2011.07.011-
pubs.organisational-data/Brunel-
pubs.organisational-data/Brunel/Brunel Active Staff TxP-
pubs.organisational-data/Brunel/Brunel Active Staff TxP/College of Engineering, Design and Physical Sciences-
pubs.organisational-data/Brunel/Brunel Active Staff TxP/College of Engineering, Design and Physical Sciences/Dept of Mechanical, Aerospace and Civil Engineering-
pubs.organisational-data/Brunel/University Research Centres and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/Brunel Business School - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/Brunel Business School - URCs and Groups/Centre for Research into Entrepreneurship, International Business and Innovation in Emerging Markets-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Arts - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Arts - URCs and Groups/Brunel Centre for Contemporary Writing-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Engineering and Design - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Engineering and Design - URCs and Groups/Centre for Energy and Built Environment Research-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Brunel Institute for Ageing Studies-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Brunel Institute of Cancer Genetics and Pharmacogenomics-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Centre for Systems and Synthetic Biology-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Information Systems, Computing and Mathematics - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Information Systems, Computing and Mathematics - URCs and Groups/Multidisclipary Assessment of Technology Centre for Healthcare (MATCH)-
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical and Aerospace Engineering Research Papers

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