In the spaces of industrial buildings with sources of heat generation, there is a tendency for uneven vertical distribution of air temperatures. Most of the ventilation systems disturb the natural pattern in the development of convective flows above the heat sources and cause an intensive mixing of the room air with inflow jets, which results in rather even distribution of its parameters in the room. States that industrial spaces with heat sources should be ventilated such that the natural tendency of the air for temperature stratification would not be suppressed but stabilised, allowing an improved air exchange efficiency and reduced air exchange rate and providing the required parameters in the occupied zone. The analytical method of evaluating the efficiency of air exchange for different methods of air supply is described. Air exchange efficiency coefficients for typical applications are presented.
KEYWORDS: rooms, heat load, heating, ventilation, zones, industrial, buildings, air temperature, distribution, energy sources, temperature stratification, air supply, air change rate, calculating, heat balance, accuracy.
Citation: Symposium, ASHRAE Transactions 1993, Vol.99, pt.1
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