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By Howard L. Hartman

This revised variation offers an engineering layout method of air flow and air-con as a part of the excellent environmental keep an eye on of the mine surroundings. It offers an in-depth glance, for practitioners who layout and function mines, into the future health and safeguard features of environmental stipulations within the underground office.

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Depending on the magnitude of these parameters, either Fick's law or Darcy's law will control the flow of methane. Naturally, the slower process of the two will determine the net rate of methane emission. An example will illustrate this point better. A typical value of Dla2 for the Pocahontas No. 3 MINE GASES 41 times larger than that for the Pittsburgh seam. This means that in a given time, Pocahontas No. 3 coal can emit a much larger fraction of its original gas content than Pittsburgh coal. 9 x 10" 15 m2), which is at least 10 times higher than that of the Pocahontas seam.

2014 kg/m 3 ). ) 21 22 PROPERTIES AND BEHAVIOR OF AIR graphic limitations of accuracy: They are designed only for a single barometric pressure or elevation and a limited temperature range. Laborious corrections must be applied when using them for conditions differing by more than about 1 in. 4 kPa) or 1000 ft (300 m) from sea level. Properties most affected are h, W, and v. For extensive work in psychometry, a series of charts covering the range of anticipated elevations or pressures and temperatures is necessary.

It is a hypothetical term, one we assume in quality control or use as a convenience in psychrometric calculations. Saturated air, which is air containing all the water vapor possible at the existing conditions of temperature and pressure, is more than occasionally encountered; and even supersaturated air (fog) is not uncommon. 1 to 4 vol% (usually well over 1% in mines). This is a "normal" atmosphere, the basis for ventilation and air conditioning calculations. So-called "standard" air is a misnomer; generally, normal air is meant.

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