Electricity Council Research Centre
Bibliographic info:
Electricity Council Research Centre report R1088

Describes the results of an investigation carried out to determine the rate of fresh air infiltration that is experienced during the winter in a modern air conditioned office building. Six different methods were employed to estimate the rate of infiltration through the building, four by direct measurement and two by calculation. The methods of direct measurement were,tracer gas decay, measured air flow through one floor, measured air flow through one air conditioning unit and measured change on power demand. The methods of calculation were by heat energy balance and by leakage through gaps around the windows. Answers obtained from the six methods differed by varying degrees and the relative accuracy of each method is examined. Concludes that the actual rate of infiltration during heating design conditions is0.4 air changes per hour.