The air leakages can have a large impact on heating needs and thermal comfort in industrial buildings. This is sometimes poorly taken into account, both due to the lack of theoretical approach and knowledge of air tightness.
This report describes results from the first group of field measurements of the air change rate in 49 nonresidential buildings in the Stale o"f California. The air change rate measurements were made using a tracer gas method. Procedures were based on protocols developed in ''Protocol for Measuring the Air Change Rate in Non-residential Buildings." Purpose of the tests was to obtain preliminary data for determining the effect of the various California Energy Codes on the air change rates in non-residential buildings.
This report describes various measurement protocols to be used in the measurement of air change rates in non-residential buildings. The measurement protocols are based on the use of tracer gas techniques.
The performance of a ventilation system, particularly that which is incorporated in centralised air-conditioning system, can be evaluated in several ways. The "ventilation efficiency and ventilation effectiveness" and "air exchange efficiency" are two of the most commonly employed methods in ventilation analysis.
The aim of the study was to investigate the operation of different types of ventilation in placesconstructed underground and ground level; the effect of ventilation on indoor radon levels wasalso examined. Air exchange rates and radon concentrations were measured in underground(n=73) and ground level (n=64) workplaces. Air exchange rates, designed exhaust ventilationflows, ventilation rates per person and area were sigmficantly higher in underground placesthan places constructed on the ground level.