We would like to clarify a reference made by Austin Williams on 'Equinox 2000' regarding the sports pavilion in Lisbon, Portugal (aj 30.3.00).
The reference to the high ceilings is made because we provided the cool air underneath each seat, in an unconventional way, at a low velocity and higher temperature, allowing it to rise and exhaust through the clerestory window vents in the roof. The standard non-environmentally friendly practice is to blow the air down from the roof towards the spectators. In this there is no advantage taken from the natural movement of the hot air, therefore it has to have higher speeds and lower temperatures resulting in a greater consumption of energy.
We are delivering the cooling to the spectators and not to the large volume of air in the arena, therefore greatly reducing the cooling capacity.
Nicholas Jacobs, director, Skidmore, Owings & Merrill, London SW1