NATURAL VENTILATION IN HOT PROCESS BUILDINGS IN THE STEEL INDUSTRY.

Published equations for the calculation of hot process building ventilation are generally misleading. Only Emswiler's article published in 1926 is error-free. Vendor brochures which show tables or equations relating flow rate to building height, temperature difference and wind velocity are generally derived from erroneous sources. Wind does not seem to significantly effect the ventilation flow rate through hot process industrial buildings ventilated by modern ridge-type roof ventilators. Three methods are relatively accurate in the calculation of ventilation flow rate, as follows: the Emswiler method, the ASHRAE method as related to temperature increase and the Hemeon method, modified as follows: Flow rate equals 20(L//n//z)**0**. **3**3(H//n//z)**0**. **3**3(A)**0**. **6**7, where it is assumed that L//n//z equals 2/3L and H//n//z equals 2/3H.