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Buildings 2019, 9(2), 35; https://doi.org/10.3390/buildings9020035

Heat Stress Pattern in Conditioned Office Buildings with Shallow Plan Forms in Metropolitan Colombo

Department Architecture, Faculty of Architecture, University of Moratuwa, Moratuwa 10400, Sri Lanka
Received: 30 November 2018 / Revised: 22 January 2019 / Accepted: 23 January 2019 / Published: 30 January 2019
(This article belongs to the Special Issue Environmental Impact Assessment of Buildings)
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Abstract

This paper critically evaluates indoor overheating of multilevel office buildings in Colombo—a tropical warm humid city. The work questions the building morphological characteristics on thermal performance and indoor climate, thus the levels of Building Energy Indices (BEI) of air conditioned buildings. Pattern of heat stress on buildings due to building characteristics and its relationship to the BEI were identified. A study of 87 multilevel office buildings contributed to identify two critical cases in shallow plan form with similar morphological characteristics such as wall-to-window ratio, aspect ratio, orientation, occupant and equipment density, and façade architecture. A comprehensive thermal performance investigation on these two critical cases quantified the heat stress patterns on their facades and thus indoor thermal environments. Indoor air temperature during office hours in 3 m × 3 m multizones across the depths and lengths in these two buildings showed deviations up to 10.5 °C above the set point temperature level (24 °C). Findings highlight the severity of heat stress on air conditioned indoor environments and the need to address this issue for energy sustainability of urban office buildings in the tropics. View Full-Text
Keywords: Multilevel buildings; indoor overheating; operational energy; shallow plan forms Multilevel buildings; indoor overheating; operational energy; shallow plan forms
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Rajapaksha, U. Heat Stress Pattern in Conditioned Office Buildings with Shallow Plan Forms in Metropolitan Colombo. Buildings 2019, 9, 35.

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