On the influence of building design,occupants and heat waves on comfort and greenhouse gas emissions in naturally ventilated offices. A study based on the EN 15251 adaptive thermal comfort model in Athens,Greece |
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Authors: | Astrid Roetzel Aris Tsangrassoulis Udo Dietrich Sabine Busching |
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Affiliation: | (1) Faculty of Engineering, Ilam University, Pajoohesh, 69315-516 Ilam, Iran |
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Abstract: | According to the Intergovernmental Panel on Climate Change the buildings sector has the largest mitigation potential for CO2 emissions. Especially in office buildings, where internal heat loads and a relatively high occupant density occur at the
same time with solar heat gains, overheating has become a common problem. In Europe the adaptive thermal comfort model according
to EN 15251 provides a method to evaluate thermal comfort in naturally ventilated buildings. However, especially in the context
of the climate change and the occurrence of heat waves within the last decade, the question arises, how thermal comfort can
be maintained without additional cooling, especially in warm climates. In this paper a parametric study for a typical cellular
naturally ventilated office room has been conducted, using the building simulation software EnergyPlus. It is based on the
Mediterranean climate of Athens, Greece. Adaptive thermal comfort is evaluated according to EN 15251. Variations refer to
different building design priorities, and they consider the variability of occupant behaviour and internal heat loads by using
an ideal and worst case scenario. The influence of heat waves is considered by comparing measured temperatures for an average
and an exceptionally hot year within the last decade. Since the use of building controls for shading affects thermal as well
as visual comfort, daylighting and view are evaluated as well. Conclusions are drawn regarding the influence and interaction
of building design, occupants and heat waves on comfort and greenhouse gas emissions in naturally ventilated offices, and
related optimisation potential. |
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