Comfort Requirements

The interior conditioning requirements on a high-rise building are similar to those of a relatively low building, but conditioned by a very exposed exterior situation. The fa?ade, the filter that manages the energy and adapts it to the different situations, is one of the essential elements to enable the proper functioning of the ensemble. Smooth glass fa?ades popular with the Modern Movement are no longer efficient. They were already barely efficient then, but were acceptable in a less demanding society; nowadays, the need to limit the consumption of fossil fuels and the emission of polluting gases into the atmosphere forces us to be much more stringent in the design of fa?ade envelopes.

The fa?ade must prevent the interior space overheating due to excess solar radiation, and at the same time guarantee the access of natural light and visual contact with the exterior; make use of thermal gain in winter in cold climates; control the thermal flow due to conduction through the envelop; all of this requires an appropriate envelop design that, far from responding to a global image, must be adapted to the climatic conditions of each location. It is important to remember that in this type of building the cooling needs due to occupation usually exceeds that of heating. If we

Fig. 10.4 Finishing panels to be pressed from the outside

add the thermal loads due to the powerful solar radiation, solar protection becomes essential. This solar protection must be placed in the inner side of the fa?ade, protected from wind loads, despite this position may decrease its efficiency.

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