ZEMCH 2015 - International Conference Proceedings | Page 646

Figure 16: Details for the double skin roofing proposed
Evaporative cooling mechanism have other positive points than reducing air temperatures, it reduces the requirement for ventilation and fresh air where fresh air is already supplied from the
outdoor, it reduces the mechanical cooling cost minimum 25% and up to 65%, decreasing the
load on the mechanical cooling system. Implementing evaporative cooling system will not only
reduce temperatures, but it will increase the life of the compressor and cooling capacity due to
less dependence on it. The performance and operation of evaporative cooling increases when
air temperatures are higher, however it works perfectly where the climate is hot dry and far from
the water bodies where humidity is less as in the case of the selected case study. The Building’s
airtightness is not required in the case of implementing evaporative cooling system; hence it
can be applied easily on the proposed double skin structure where it’s not completely sealed
structure. Studies and experiments showed that reduction in air temperatures increases when the
difference in dry bulb temperature and wet bulb temperature is bigger. To calculate the reduction in temperatures achieved by the evaporative cooling system using an example that dry bulb
temperature is 90F and wet bulb temperature is 70F where the following equation (1) can be used
(Aoshuang and Xiang 2008:15).
Temperature drop= (DB – WB) x (Efficiency of evaporative medium)*

*Efficiency is indicated by the supplier and usually reaches to 90%

Temperature drop= (90 – 70) x 0.9 = 18 degrees F

(1)

Noise and Vibration Reduction
Strategy Intent
In addition for being a smart creature in adapting to the harsh climate, Nightjar is the only bird in
additional to the owl that have the ability to fly silently in order to catch their food while flying.
The structure of their feathers allows them to fly silently due to the complex design of the wing
that consists of different parts as shown in Figure 17.

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ZEMCH 2015 | International Conference | Bari - Lecce, Italy