building ventilation the state of the art pdf

Keeping the indoor temperature at a constant value has a high investment cost and is energy intensive, with implications for resource consumption and environmental impact. Important energy savings can be obtained if the building has a larger range in which it can run freely. This saving can be augmented if ventilation is used for cooling. In fact, field studies show that people accept a larger range of temperature variation in naturally ventilated buildings than in air-conditioned ones (de Dear et al, 1997; Brager and de Dear 1998, 2000).

The European project URBVENT: Natural Ventilation in Urban Areas studied the potential for energy savings when ventilation is used instead of air conditioning and the alteration of this potential by the urban environment. A synthesis of the main findings of this project is given in the following section. First, general aspects about modelling and strategies for natural ventilation in the urban climate are reviewed. Results of the URBVENT project are then presented.

A method for estimating the energy savings for cooling by using ventilation is introduced. Although the potential savings may be important, they are affected by the influence of the urban environment through reduced wind velocity, urban heat island, noise and pollution. These changes, which were studied experimentally in the project, are synthesized along with their results in simple algorithms.