Leakage measurements of houses are common practice in many countries, partly because they are needed for predicting ventilation rates. To use the measurements in this way it is usually necessary to fit an equation to the measured leakage data, so that the data can be extended into the region of interest. At present, the power-law equation is generally chosen for the curve fit. Considers a new approach using a quadratic equation. Shows that there can be large differences between the 2 equations, so the choice of equation is important.

Describes work carried out by British Gas to establish the magnitude of heat losses from gas-fired boilers arising from natural ventilation through the boiler during its shutdown period. Discusses the general principles of ventilation heat losses to the flue and via the draught diverter and presents data for heat loss decay rates for a range of boilers. Calculates ventilation heat losses for typical boilers. Concludes that for a typical open-flued domestic heating boiler, ventilation heat losses are approx 6% or less of total heat input.

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

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

Discusses the ASHRAE Standard 62-1981 "Ventilation for Acceptable Indoor AIr Quality", and extensive field measurements of ventilation. Presents apredictive model for indoor air contaminant concentrations in residences andits verification, along with the effects of several variables. Additional research on the indoor emanation rates of contaminants which are health hazards would enable the prediction of indoor contaminant levels with various control options.

Describes a program which enables a hand-held computer to perform the energy audit calculations used in Building Practice Note No.20 "Estimating energy savings from reinsulating houses". The computer prompts the user for information, and provides a fast and versatile way of performing energy audit calculations.

Summarizes the information obtained concerning new residential construction in the US and points out important differences between US and Swedish technology and construction methods for energy efficient housing. Selected building components for US housing are described and compared with corresponding Swedish techniques. Most important differences are -1. Differences in ventilation strategies - almost all new Swedish houses have continuous mechanical ventilaton. 2. The airtightness of building envelopes. 3. Wall constructions and standard insulation practices.

Natural ventilation can be used to reduce cooling loads and increase human comforts in buildings in hot humid climates. Airflow rates are determined by the wind pressure on the faces of the building and the amount of open area. Describes wind pressure coefficient measurements made on 2 buildings at theKaneohe Marine Corps Air Station on the island of Oahu, Hawaii during summer 1982. These full scale measurements will be compared to reduced-scale measurements made of the boundary-layer wind tunnel at the Naval Civil Engineering Laboratory.

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

Examines the sensitivity of the predicted air infiltration rate to measured building air tightness data and the wind exposure index determined from site inspection. Presents results of air tightness tests in New Zealand houses, which indicate the range of leakage resistance for components, for solid materials (such as wall and ceiling lining materials) and for cracks separating major components such as floors and walls.