A major pathway for loss of conditioned air in east Tennessee homes with externally located HVAC systems is leakage in the ductwork. The effect on infiltration rates, as measured by Freon-12 tracer gas dilution, becomes marked if the central duct fan is operating. Duct fan on and duct fan off measurements of the rate of air exchange gave mean values of 0.41 and 0.78 ach respectively in a total of 31 homes.
Fan pressurization tests on 2 unoccupied houses have been conducted once every 2 weeks for a period of a year to determine the seasonal variation in air tightness. House no.1 was built with more insulation than is required by the local building
Investigates the energy performance of a two storey occupied gas heated house in Ontario Canada by means of steady state and dynamic analyses of measured data. Experimental results were obtained from a monitoring study done on an hourly basis.
Describes an energy efficient hypermarket built in South Wales. Describes energy conserving features, including CO2-controlled ventilation using an infra-red analyser. Briefly discusses problems of installing and calibrating the system.
To simulate time-dependent interior humidity, a moisture mass balance is applied to the control volume of the envelope of a residential structure. Moisture transport mechanisms incorporated include infiltration, cooling coil condensation, int
Discusses different ways of defining and comparing ventilation efficiency. It can be defined in absolute values ie the ability of the system to decrease the concentration of impurities in proportion to the maximum concentration. A time consta
Presents a model for computing the infiltration and air flow between rooms of a multi-room building in terms of basic principles of fluid mechanics. This model has been incorporated into a comprehensive loads-predicting computer program. Air flo
A small test house having a pitched roof/ventilated attic was installed in a high bay environmental chamber. The test house and its attic were extensively instrumented for measuring heat and moisture transfer. The test house was exposed to a ser
Presents results of full-scale pressure measurements on 3 test houses. Discusses the influence of different input parameters, such as leakage characteristics and pressure distribution on the rate of air infiltration, employing a simple calculation model.
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