German

Provides results of research in Switzerland into window ventilation in typical rented dwellings as a function of outdoor climate, and the research support activities of the Air Infiltration Centre in the UK funded by the International Energy Agency. Describes in particular the creation of an air infiltration database, the comparison and validation of computer models of air infiltration, the development of a reporting format for measurement of air change in buildings, and the compilation of a glossary of technical terms.

Shows that efficient moisture removal in a ventilated roof via ventilation openings is a function of roof length. Beyond a certain critical length all moisture diffusing in from below will be deposited in the roof. The critical roof length will be greater the more vapour tight the section beneath the roof space is. If a vapour barrier is necessary, as in an unventilated roof, it maybe that an unventilated roof is preferable in the first place.

Improved insulation of domestic buildings has resulted in ventilation heat loss forming a large part of the total heat loss. Estimates show that energy consumption in the Federal Republic of Germany could be reduced by ventilating design methods eg by economical ventilating systems suitably adapted to theheating installations. A number of technical facilities exist for the utilisation of this potential, which at the same time maintain the necessary requirements for indoor climate.

In future, high altitude correction factors will be considered in computing the ventilation heat load in high rise buildings. The algorithms necessary for the calculation are deducted and stated by the author.

Presents the first of two sections of report 34020, detailing measurements carried out over the winter period of 1975/76 in Swiss dwellings with mainly hot water heating and some extract ventilation in kitchens and bathrooms. The aim of the research was to obtain a general picture of air change conditions in typical Swiss dwellings and to determine the effect of influencing parameters. The overall aim was to take a step towards the establishment of more surely founded rules of calculating ventilation heat loss as a function of influencing parameters.

The second of two sections of a report of air change measurements in the winter period 1975/76 of non-air conditioned buildings in Switzerland, chiefly dwellings. Recapitulates the reasons for the research, the theoretical bases, measurement method used and aims of the experimental investigations. Sets outin tables detailed results of measurements carried out in a wide range of Swiss dwellings of different ages, locations, construction, design and type.

Discusses the provision of German Standard DIN 18017 regarding requirements for the ventilation of inner rooms such as bathrooms and kitchens. 

Discusses and analyses the characteristics of methods of determining local air flows through the building envelope, methods of determining the air leakage and ways of determining air changes in rooms. Summarises in a table methods of determining local air flows. Of the air leakage methods, treats static and non-static methods. Considers three commonly used tracer gas methods for air change measuring methods.

In most office buildings, the continuous renewal of air cannot be guaranteed by means of ventilation through windows during any optional time. It is known (in the case of radiators and window ventilation) that when a window is open the ventilating heat cannot be recovered and other heat losses will occur.< The paper proves that the heating of a building by air is a greater energy saver then the conventional solution through static heating and window ventilation.