Dutch

An earlier paper gave the flow to be expected through an open door from theoretical considerations. Describes model tests designed to check these theoretical predictions. The model used was 6.3% of full size and water was used instead of air for the flow medium. Concludes there is reasonably good agreement between model and theory.

Reports study of wind and rain over fifteen years and gives table of results. Reports measurements of wind pressure and driving rain on buildings. Discusses laboratory measurements of the tightness of facade elements under pressures of up to 50 Pa. and with temperature differences of -40 to +30 deg.C. across the facade. Describes pressurization of buildings and gives results of measurements in test dwellings. Discusses movement of joints in buildings and describes measurement of this movement.< Discusses permeability of both flat and sloping roofs.

Reports insights from research project "Optimalisatie koelhuisbouw" (Optimisation of cold store buildings) by the Delft Technical University for the Foundation for Cooling Technique Development. Pleads for standardisation of the maximum admissible heat gain by air leakage and yearly averaged pressure differences between the cold room and its surroundings. Gives some numerical examples. Uses theory of specific equivalent leak opening.

Recommends method for determination of extra heat and moisture load of a cold room resulting from leakages through chinks, cracks and porosity. Recommends clause on maximum leakage in delivery conditions. Treats internal and outdoor influences on air exchange, leakage detection and leakage measuring methods.

The authors show how the shape and surroundings of buildings and their situation in relation to prevailing winds affect the pressure distribution in a building. Variations in positive and negative pressure zones in relation to wind speed and direction in discussed and the so-called "stack effect". Model tests carried out in wind tunnels on both high and low buildings are reported.

Treats odour penetration from garages etc. into connected room, caused by wind pressure on windward side openings. Discusses measures to prevent overpressure e.g. by a leeward side grill oran exhausting ventilator. Explains with mollier diagrams.

After a general introduction on the cause of wind, the dependence of wind speed increase with height on surface roughness and atmospheric stability is discussed. For the purpose of wind load calculation on structures this speed increase is often approximated by the pth power of height where the exponent p varies both with roughness, stability and the height of the layer in question. The last mentioned variation implies that extrapolations of p above its determination height cannot be depended upon.

Gives general data about windows in the experimental dwellings and the transport of air through small openings. Describes method for calculating the rate of air infiltration through windows as a function of the pressure difference between both sides of the construction. Presents results for each type of window graphically in several ways. Gives figures for cracks between movable construction parts.

Reviews means of rain water penetration and how to apply one-stage weather proofing listing the disadvantages. Reviews research results obtained with two-stage weather proofing by adding an additional seal and summarises the pressure variations resulting from wind plus the design of horizontal and vertical joints between individual facade segments. Discusses the practical design of joint and sealant illustrating this for a few window types and adds that this design is also applicable for a complete curtain wall.