standard

Notes that ventilation efficiency is not referred to directly in the new DIF standards for ventilation effciency. Reasons for this are that there are no clear definitions for the term or instructions on how optimum ventilation efficiency can be achieved under different operating conditions. Describes some measurements carried out on ventilation efficiency in non-industrial premises.

Briefly describes the new DIF standard for ventilation plants and the Danish standard DS 447. Discusses the relationship between heating and ventilation. Mentions heat recovery and problems encountered in ventilating swimming halls.

Discusses some problems of interpretation of the French regulations concerning domestic ventilation promulgated 24th March 1982. Notes in particular problems connected with natural ventilation.

Notes initial airtightness requirements in SBN 1980 and discusses various forms of ventilation. Discusses how tightness testing can reveal location and magnitude of leaks. Gives theoretical method of calculating air leakage flow and relates this to practical measurement. Considers different alternatives such as pressurising the building and combining tightness testing with thermography. Discusses 1980 building regulations and what buildings ought to be tested. Lists critical points of a building and measures which can contribute to good airtightness.

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.

Reports measurements on air transport through homes made by a committee working a Dutch Standard on Heating Load Calculation similar to DIN 4701, but taking account of air infiltration losses through joints and cracks between glazing, window-frame and facade construction. Describes the measuring method applied. Tables air leakage coefficients c and flow exponents, n ,of a number of flats and single family houses. Also tables c and n values of cracks according to type of construction and material, use of weather strips and measuring institute.

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

Describes wind tunnel study where both static and dynamic, local and spatially distributed loads have been measured for a variety of representative low-rise building geometries. Determines experimental pressure coefficients for the interior of buildings with various porosities and wall openings. Describes the assumptions made to reduce the large quantities of data to a small set of simplified pressure coefficient charts appropriate for use in a code or standard.

The ventilation recommendations set out by the British Standards Institute Code of Practice, the Building Research Station Advisory Papers, and CIBS are outlined.