Building Envelope Design For Indoor Air Temperature In Hot And Dry Climate, Yemen
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Date
2015-02
Authors
BAKHLAH, MOHAMMED SALEM OBAID
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Abstract
Passive design on building envelope is one of the most effective methods of
minimising the impact of harsh outdoor condition, reducing the heat gain as well as
to improving the indoor thermal condition in hot and dry climate in Yemen. Local
architects of today give less attention to building envelope design to reduce indoor
air temperature. This research discusses the results of the experimental and
simulation studies with the purpose to reduce the indoor air temperature by applying
modifications on the building envelope design. It aims to reduce the indoor air
temperature of residential houses built from mud bricks in hot and dry climate of
Wadi Hadhramout, Yemen, and finds recommendations for efficient method in
building envelope design. The investigation was performed in two phases: first phase
is indoor and outdoor fieldwork measurements in four case studies in old and new
urban area at Tarim city, Yemen. Several modifications on building envelope such as
fix shading projection and painting roof whitewash colour were performed. Second
phase is: computer simulation using IES (VE) software was carried out to investigate
the effects of other different envelope modifications. The modifications were carried
out on the roof, wall, orientation, window to wall ratio and external shading devices.
The investigation was carried out on each parameter and then in the last stage the
combination of all ideal modifications was made. The results showed that by
applying a combination of all ideal modifications, the indoor air temperature was
able to be reduce compared to the fieldwork measurements. Design No.4 (D4) is the
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best building envelope design which recorded the highest average difference
(0.76ÂșC) of indoor air temperature. In terms of the number of annual thermal comfort
hours, design No.3 and 6 (D3 and D6) are the best envelope designs in which they
improved the annual number of thermal comfort hours to 7.87%.
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Keywords
Building Envelope Design For Indoor Air Temperature , In Hot And Dry Climate, Yemen