Evaluation and design of double-skin facades for office buildings in hot climates

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Title: Evaluation and design of double-skin facades for office buildings in hot climates
Author: Yellamraju, Vijaya
Abstract: The main objectives of this research are (a ) to investigate the thermal effect of double skin facades in office buildings in hot climates and (b ) to propose guidelines for their efficient design based on this evaluation . The study involves the energy performance analysis of two buildings in India . A base case with the existing building skin was simulated for both the cities . The main source for the high cooling loads was found to be heat gain through windows and walls . This led to the evolution of a series of facade strategies with the goals of reducing heat gain , providing ventilation and day -lighting . The buildings were then simulated for their energy performance with the proposed double -skin strategies . Each of these strategies was varied according to the layers constituting the facade , the transparency of the facade and the orientation of the facade to which it is applied . Final comparisons of energy consumption were made between the proposed options and the base case to find the most efficient strategy and also the factors that affected this efficiency . The simulations were done using the building simulation software , Ener -Win . The double skin was simulated as per an approximate and simplistic calculation of the u -value , solar heat gain coefficient and transmissivity properties of the layers constituting the facade . The model relied on logically arrived at assumptions about the facade properties that were approximately within 10 % range of measured values . Based on inferences drawn from these simulations , a set of design guidelines comprised of goals and parameters was generated for design of double -skin facades in hot climates typical to most of the Indian subcontinent . It was realized that the double -skin defined typically as a 'pair of glass skins separated by an air corridor' may not be an entirely energy efficient design strategy for hot climates . However , when used appropriately in combination with other materials , in the right orientation and with the right transparency , a double -layered facade turns out to be an energy efficient solution .
URI: http : / /hdl .handle .net /1969 .1 /205
Date: 2004-09-30

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Evaluation and design of double-skin facades for office buildings in hot climates. Available electronically from http : / /hdl .handle .net /1969 .1 /205 .

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