By British Standards Institute Staff, British Standards Institution
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Additional info for Code of Practice for Ventilation Principles and Designing for Natural Ventilation
5 L/s. 3 L/s. Summary The required ventilation rates for the range of possible criteria set out in Appendix D may be summarized as follows. 0 Vppm): 6 L/s w. ) 26 L/s for case (b) 48 L/s ww for case (a): Thus, in this case, the dominant criterion is control of odour from tobacco smoke, leading to a ventilation requirement of 100 L/s, followed by control of body odour and water vapour which lead to values about one-half of this. NOTE In this example only common contaminants have been taken into account.
In dwellings which are of a type of construction which may be more airtight than normal, such as those with a particularly carefully fitted and jointed polyethylene vapour barrier, it may be necessary to increase the areas of the background ventilation openings to compensate for the reduced background air infiltration. Background air infiltration may be assessed using the method described in clause 15. 2 and in all cases it is essential that such regulations take precedence. g. severity of exposure to weather, airtightness of the building structure, or requirements for protection against ingress of radon, methane or other soil gases.
2 Required ventilation rates for different purposes a) Control of carbon dioxide Sources of carbon dioxide are: 1) human respiration; and 2) operation of the kerosine heater. 9 L/s. b) Control of body odour On the basis of the 8 L/s per person the required ventilation rate is 48 L/s. c) Control of tobacco smoke If control of odour is taken as the criterion, then on the basis of a smoking rate per h the required ventilation is 360 m3/h which is equal to 100 L/s. 0 L/s. e) Control of humidity 34 © BSI 01-2000 BS 5925:1991 co m Sources of water vapour are: 1) human respiration; and 2) the kerosine heater.