Building Design Approach For The Indoor Thermal Comfort With Low Or Nil Energy Consumption

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Building design approach that focuses on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low or nil energy consumption is termed as Passive Cooling. (Santamouris & Asimakoupolos, 1996, Samuel, et al, 2013). This approach works either by preventing heat from entering the interior (heat gain prevention) or by removing heat from the building (natural cooling) (Limb, 1998). Natural cooling utilizes on-site energy, available from the natural environment, combined with the architectural design of building components (e.g. building envelope), rather than mechanical systems to dissipate heat (Niles. Et al, 1980). Therefore, natural cooling depends not only on the architectural design of the…show more content…
The thermal mass will absorb and store heat during daytime hours and return it to the space at a later time (Santamouris & Asimakoupolos, 1996). Therefore, passive cooling techniques that use heat sinks can act to either, modulate heat gain with thermal mass, or dissipate heat through natural cooling strategies. The design of a building is a very important factor which influences the cooling potential of a natural cooling technique. Natural cooling techniques includes: natural ventilation, night flushing, evaporative cooling, ground cooling and radiative cooling (Santamouris & Asimakoupolos, 1996).
2.7.2 3. Night Flushing
Night flushing (also known as night ventilation, night cooling, night purging, or nocturnal convective cooling) is a passive or semi-passive cooling strategy that requires increased air movement at night to cool the structural elements of a building (Santamouris & Asimakoupolos, 1996). (Samuel, et al, 2013). Unlike free cooling, which assists in chilling water, night flushing cools down the thermal mass. To execute night flushing, the building envelope typically stays closed during the day, causing excess heat gains to be stored in the building 's thermal mass.

The building structure acts as a sink through the day and absorbs heat gains from occupants, equipment, solar radiation, and conduction through walls, roofs, and ceilings. At night, when the outside air is cooler and not too humid, the envelope is opened, allowing cooler air to
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