Technical Note TN 1/88 Ventilation effectiveness in mechanical ventilation systems (Withdrawn)

Publication Year

1988

Document Status

Withdrawn

Abstract

Defines ventilation effectiveness as a measure of the performance of the ventilation system in terms of maximising the use of a given fresh air input in reducing indoor generated pollutant concentrations. Describes a laboratory-based examination of the ventilation effectiveness of three different types of mechanical ventilation arrangements. Measures the difference between extract only, wall-mounted supply grilles and floor mounted supply twist outlets. Also investigates different rates of fresh air supply, with a simulated occupant producing the contaminant. 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. 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.

ISBN

9780860221890

Publisher Information