A
study
to determine the thermal and daylight performance of the atrium space
within the 32 – 44 Hans Crescent building.
Two roof glazing options have been considered, Kalwall
crystal/crystal and SG Planitherm clear double glazing. The Kalwall
would reduce solar heat gains and hence reduce the risk of overheating
compared with the SG Planitherm, but would also reduce the daylight
available at the bottom of the atrium.
To compare the two options a 3D computer model of the
building has been created. This model contains the thermal and lighting
properties of all the materials to be used in the building. This model
is able to predict internal temperatures and daylight availability on an
hourly basis for any period up to a full year. This is achieved by
driving the building model with recorded hourly weather data, which
contains solar intensity, air temperature, humidity, wind speed and
direction. A weather set for the London area has been chosen that has a
warm summer.
In order to judge the relative performance of the design
options, the number of hours exceeding 25oC resultant
temperature has been determined for the summer months. Resultant
temperature is the CIBSE measure of thermal comfort and is a combination
of air and mean surface temperatures.
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Shadows
cast for day 190 between 05:00 and 20:00 Hours |
