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A step-by-step guide to calculate the number of supply and exhaust fans required for pressurized ventilation in an industrial space. the necessary steps to determine the total quantity of air passes through the space due to a specific number of air changes and the total quantity of air required to remove the generated heat within the space. The document also provides information on how to select the number of fans needed to be installed.
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ROOM 20m x 10m x 8m WITH 10 AIR CHANGES PER HOUR AND 20 KW HEAT LOAD TO MAINTAIN TEMPERATURE 5°C LESS THAN THE AMBIENT.
a) Heat Load (Q) = 20 KW(KiloWatt) b) Temperature Difference (Δ T) = 5 c) We know Q = m.Cp. Δ T Cp (Specific Heat of Air)=0.24 Kcal /Kg°C So, Mass of the air (m) =(Q X 860)/ (Cp. Δ T) [ 1 KW = 860 Kcal per Hour] = (20 X 860 ) / (0.24 X 5) = 1433. Kg. d) Volume of the air = m / Density of air = 1433. / 1.225 Kg per Cu.m = 1170.06 Cu.m per Hour