Describes main features of full-scale wind load tests made on Royex House, an 18-storey office block in London. Wind tunnel tests were made on a model of the building and the results compared. Concludes that wind load on building is almost entirely on the windward wall, short duration gusts are significant in loading the building. Finds reasonably close agreement between wind tunnel and full scale tests in the matter of overall drag coefficient, but an assessment of the pressure distribution on the surface of a building requires a model with permeable walls.
Describes the basis of operation of electron absorption detector and the nature and causes of the erroneous and anomalous responses it may generate. Suggests pulse sampling technique asan alternative method of analysis. This retains the sensitivity of the simple low potential ion chamber method, but is substantially free of errors and anomolous responses. Describes the basis of this improved method and gives an account of the technique for its use in quantitative and qualitative analysis.
A comprehensive manual describing theory and techniques of thermography as used to determine insulation defects in buildings. Describes operation of infrared camera and theory of interpretation of thermograms. Provides practical rules for field work and discusses possible sources of error. Concludes with 56 page catalogue containing over 700 typical thermograms, many in colour, illustrating four wall types built a) strictly according to specifications and b) with common structural and insulation defects.
Discusses the nature of stack effect, the distribution of air pressures across a building enclosure and its interior separations that stack action causes, and some of the implications of the resulting air flow patterns. Concludes that way in which stack effect is distributed across the building enclosure can be altered by design.
Outlines principles behind a program for calculating air flow in buildings. The generally accepted method for these calculations is Kirchoff's network equations, of which the "knot method" and the "loop method" are alternatives. The program uses a mixture of both, in an attempt to keep the intermingling of the equations to be solved on a low level. Presents results of calculations on a 50-room example, in which it was the purpose to demonstrate the possibility of using the program for discussion of ventilating system fluctuations.
Reports 312 measurements of ventilation rate in 31 rooms in old and new blocks of flats, 3 villa residences and a modern university building, made using coal gas as a tracer. Describes buildings and gives main results. Examines effect on air change rate of sealing flues and gratings, opening windows and weather conditions. Finds outside wind speed has most influence on ventilation rate. Discusses recommended standards of air supply.
Briefly reviews air leakage around windows. Discusses heat loss through windows, dependence of leakage on pressure difference across windows, effect of leakage on condensation. States that tight windows can save heating and cooling costs but weatherstripping is necessary for tightness.
Presents results of measurements of ventilation rate and window air leakage made in blocks of flats in Sweden. Describes measurement of ventilation rate using nitrous oxide as a tracer gas and pressurization tests on windows. Gives graphical results of tests. Finds that the majority of windows do not satisfy 1975swedish building code. Reports measurements of air leakage of windows before and after renewal of draught excluders. Concludes that old windows can be made relatively draught-free and that this is not expensive or time consuming.
This paper is a general survey of work done on natural ventilation of dwellings. Discusses ventilation of houses with both natural and mechanical ventilation. Reviews experimental investigations, quoting air-change-rates found. Discusses ventilation requirements and methods for investigating different factors. Outlines suggested experimental method for investigating air infiltration of mechanically ventilated houses.
Login