Discusses standards and guidelines used for calculating the heat demand over a heating season. Notes inadequacy of current methods, in particular the inadequate account taken of certain environmental conditions and of particular window constructions. Proposes improved sizing procedure to take into account heat loss due to infiltrating air. Discusses simplifying assumptions. Gives expressions for critical heat output and for the quantity of air infiltrating a room.

Energy lost through ventilation becomes increasingly important as building insulation levels improve. Describes application to this problem of heat pump dehumidifier which transduces latent heat of moisture in cool damp air into sensible heat of warm drier air. Describes laboratory prototypes which combine sensible heat from counter flow heat exchangers with heat transfer properties of a heat pump. Claims such systems perform twice as effectively as conventional equipment and offer a new approach to ventilation losses.

Discusses energy saving measures taken in the Ekono office building, headquarter of Ekono consulting engineers, situated near Helsinki. Describes the use of hollow slabs for intermediate floors, tight window construction, the extract air window system, efficient lighting and computer control of ventilation. It is planned to control ventilation by monitoring the concentration of carbon dioxide in the building. Reports measurements of infiltration rate with nitrous oxide as a tracer gas using both constant concentration and decay rate techniques.

Describes the development of an anemometer for the measurement of rapidly fluctuating air flows. Describes the B.R.E. shielded hot wire anemometer. Discusses modifications made to this anemometer to improve its response by using different shields and moving sensor wires closer together. Outlines system for processing signals from the anemometer using a micro-computer. Gives results of performance tests. Gives simple applications of theinstrument.

A simple method for generating values of the monthly mean wind speed from Caton's annual wind speed map has been developed. Gives details of method. Results have been checked against observation as far as the limited data tohand will allow. When derived wind speeds are inserted into the average day computer programs developed in the Department of Building Science at Sheffield University the predicted air temperatures agree reasonably closely with observed air temperatures. Concludes method is practicable for applications in building energy studies.

Proposes a method of linking pressurization measurements in buildings with infiltration rates. The method is based on a simple theoretical model. Gives details of whole house pressurization tests and tracer gas measurements of ventilation rate (using N2O) in fifteen houses. Gives details of the theoretical model and compares field measurements with model predictions. Finds good agreement and concludes model may be used to estimate air change rates using leakage data. Finds surface pressure coefficients for typical house shapes and notes a dearth of data of this type.

The conduction of sound through the gap between window and wall depends on the width of the gap. This width also determines the air leakage, suggesting that air leakage might be measured by an acoustic method. Notes method requires that cracks are relatively large and have fewer than three kinks. Reports measurements in a wind tunnel of air flow through crack models made from aluminium and compares results with theory. Finds empirical expression relating pressure difference to air flow and gives graphs of results.

Reports tests of the effect of various air treatment devices on the radon daughter concentrations within a room. Test were carried out using an electrostatic precipitator, a humidifier and a dehumidifier. The ventilation rate of the room was measured using Krypton 85 as a tracer gas.< Finds that the use of a humidifier, dehumidifier or carbon filter gave no significant alteration to the radon concentrations in the room, but that the electrostatic precipitator reduced the concentration considerably and was equally effective when operated with or without the carbon filter.

This is a short guide to mastics and sealants used to seal the joint between an aluminium window and a structure. Gives table of materials available, and their properties. Gives detailed instructions for applying sealants to window joints.