ZEMCH 2015 - International Conference Proceedings | Page 645

Figure 13 shows a detailed mechanism of evaporative cooling in the nightjar, when the gular sac
increases its size and the air that passes through the mouth cavity increases its speed. As the moving air touches the moist surface and the hot blood vessels below, the inner surface temperature
will decrease through convection and leaving the hot air to pass out (AskNature 2012).
Strategy Implementation
From the cooling mechanism that the nightjar uses to adapt to its nature and reach to its comfort,
evaporative cooling technique can be inspired in hot climate by installing a moist mesh in the
building and increase the ventilation rates in order to achieve evaporative cooling and reduce energy conception required for cooling, that will lead to a better building performance. Designing a
double skin ceiling for the metro station with installing a moist skin material for the inner skin, and
creating opening in the upper skin that will allow the natural wind to flow from the west north
direction will create evaporative cooling that will decrease the sun radiation and heat exchange
between the indoor and outdoor space that’s is caused by convection & conduction, leading to a
higher efficiency and reducing in the amount of energy required for cooling as shown in figure 16.

Figure 14: Moist material for buildings (Ergodyne 2012)
On the other hand, the air that is cooled out from this system will form natural ventilation for the
area between the towers and metro station which is dull and blocked by the massive structure
of the metro and rail, in this way the environment will be enhanced for the pedestrians that are
using this way leading to their home, office or to the station.

Figure 15: The Narrow Space between the Metro Station and Towers (by author)

Thermal comfort through biomimicry in the case of Emirates Towers Metro Station in Dubai

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