Ventilative cooling

It can be used additionally to remove both excess heat gains, as well as increase the velocity of the air and thereby widen the thermal comfort range.

The reasons are:[5][6] In many post-occupancy comfort studies overheating is a frequently reported problem not only during the summer months but also during the transitions periods, also in temperate climates.

[7][8][9] The system cooling effectiveness (natural or mechanical ventilation) depends on the air flow rate that can be established, the thermal capacity of the construction and the heat transfer of the elements.

The night ventilation may remove effectively accumulated heat gains (internal and solar) during daytime in the building constructions.

[17][18][19] Ventilative cooling can be found not only in traditional, pre-air-condition architecture, but also in temporary European and international low energy buildings.

[1] Effective control strategies ensure high indoor comfort levels and minimum energy consumption.

Main control parameters are operative (air and radiant) temperature (both peak, actual or average), occupancy, carbon dioxide concentration and humidity levels.

[22] The third option is that operation of facades is left to personal control of the inhabitants, but the building automation system gives active feedback and specific advises.

The results from the Annex facilitate better possibilities for prediction and estimation of heat removal and overheating risk – for both design purposes and for energy performance calculation.