Describes a programme of ventilation measurements performed on a group of energy efficient houses built in the mid-1970's and situated in Abertridwr, S.Wales. Pressurization, tracer decay and British Gas autovent techniques were employed. Results show satisfactory whole-house ventilation rates (0.5 ac/h), but the living room and bedrooms had very low ventilation rates. Some cases showed serious condensation. "Trickle" ventilation installed in 18 of the houses improved internal ventilation patterns and condensation levels were substantially reduced.

Describes a simple method of controlled ventilation comprising an extract system and air inlets. The extract system is effectively a flue connecting to vents in the kitchen and bathroom and relying on thermal differences and the wind to create air flow, air enters the house via slot vents over windows. Theproposed system has been installed in a timber framed house.

Examines several ventilation strategies in tight houses for both impact on the total ventilation and effect on the energy balance of the system. Uses the single-zone infiltration model developed at LBL as part of the calculation of total ventilation load. Strategies covered include natural systems such as ventilation stacks as well as mechanical systems such such as air-to-air heat exchangers and exhaust fans with and without heat pumps.

Illustrated booklet for the layman on heating and ventilation in housing which discusses the following: oil heating, wood firing, electrical heating, district heating, heat pumps, solar collectors for domestic hot water, ventilation systems, natural ventilation, mechanical ventilation, push-pull systems, heat exchangers, fans. Appendix discusses measurement of oil-fired system efficiency.

The Heimdal project concludes that airtight houses can be built. Measurement results from 11 detached houses indicate an average leakage factor of 0.9. Building regulations in Norway require a value below 4 and NBI's field investigations indicate that there have been problems in complying with this requirement. The results from the trial houses have been achieved through the implementation of available methods but construction on site has been carefully planned and executed.

Describes project on experimental housing of a new type built by Swedish manufacturers employing light, timber construction. Good airtightness and careful work results in the lowest total cost. Investigation shows results of profitability of various investments. Illustrates energy balance for housing discussed.

Reports on seminar at University of Lund, Sweden and the factors affecting U-value: radiation, thermal capacity, moisture in materials, evaporation of precipitation moisture, convection, air movement, quality of work, cold bridges, ageing, air gaps.

Distinguishes the problems of designing natural ventilation systems for summer and winter conditions and discusses in detail the objectives, methods and some field studies directed towards the solution of winter ventilation problems.< Describes experimental work conducted in a low-energy house equipped with adjustable slot ventilators in the window frames. Both tracer gas decay methods and pressurization tests indicate similar increases of air flow when the ventilators are opened.

Describes the measurement of infiltration and air change rates in one flat in an apartment block containing 24 flats. Gives the general principles of the pressurization method and tracer gas method for measuring air change rate and infiltration rate. In this situation uses N2O as the tracer gas and measures concentrations with an infra-red gas analyser. Measures the effects of opening and sealing windows, and of closing internal doors on the air change rate and air movement in the flat.

Surveys the Danish energy-saving program in the Ministry of Housing 1975-1987. Covers grant schemes, energy conserving measures in public and state buildings from 1975, control schemes for heating installations, and building regulations. Includes as an appendix a copy of the 1982 Act on the Reduction of Energy Consumption in Buildings.