By Howard L. Hartman
This revised version provides an engineering layout method of air flow and air con as a part of the excellent environmental regulate of the mine surroundings. It presents an in-depth glance, for practitioners who layout and function mines, into the health and wellbeing and defense facets of environmental stipulations within the underground office.
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Additional resources for Mine ventilation and air conditioning
Example text
Their use is demonstrated in the sections that follow. , McQuiston and Parker, 1982). At a known barometric pressure, any two psychrometric properties of air fix the state point; those easiest to measure and to employ are the drybulb and wet-bulb temperatures. ) Barometric pressure ph: atmosphere pressure as read by a barometer; in in. Hg or psi (mm Hg or Pa). Dry-bulb temperature td: temperature indicated by a conventional dry thermometer, a measure of the sensible heat content of the air; in °F (°C).
Diffusion is aided by turbulence and temperature. In the mine atmosphere, and particularly one that is stagnant or quiescent, stratification of gaseous impurities may occur. , hydrogen) near the roof. Convection currents and the ventilation airstream, however, tend to promote the diffusion of any foreign gas that is introduced into the mine atmosphere. Once gases have diffused, they will not restratify. 5). 16) where Z is elevation above sea level in ft (m). l lists air specific weights, barometric pressures, and temperatures for various elevations, based on Eqs.
3 MINE GASES 31 sures up to 15 min without suffering from (a) irritation, (b) chronic or irreversible tissue change, or (c) narcosis of sufficient degree to increase accident proneness, impair self-rescue, or materially reduce work efficiency. This is provided that (a) no more than four exposures per day are permitted, with at least 60 min between exposures, and (b) the daily TLV-TWA is not exceeded. 3. Threshold Limit Value-Ceiling (TLV-C). This is the concentration that should not be exceeded even instantaneously.