Publisher's Synopsis
This title defines ventilation effectiveness as a measure of the performance of the ventilation system in terms of maximizing the use of a given fresh air input in reducing indoor generated pollutant concentrations. It describes a laboratory-based examination of the ventilation effectiveness of three different types of mechanical ventilation arrangements and measures the difference between extract only, wall-mounted supply grilles and floor mounted supply twist outlets. The book also investigates different rates of fresh air supply, with a simulated occupant producing the contaminant. It concludes that the overall fresh air ventilation rate is the key parameter, with ventilation effectiveness having a secondary influence on the acceptability of the indoor air quality. It also notes the differences in the ventilation effectiveness of the three systems, with the largest difference of 28% between extract only and floor-mounted twist outlets, the latter providing the more favourable result.
