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Calculate water in combustion air. R.G. Kunz. Hydrocarbon Processing, September 1998, 77(9), 119--122.

The amount of vapour-phase moisture carried into a combustion process by the air supply is determined by the temperature, pressure, and humidity of the atmosphere. A simple procedure is described for estimating the moisture content of combustion air. It uses wet- and dry-bulb temperature measurements and recordings of atmospheric pressure. Mathematical expressions illustrate the calculation required. A practical example using representative atmospheric data from stack tests is discussed. Tabulated data show dry- and wet-bulb temperatures and atmospheric pressures. Relative humidities derived from the method are compared with values interpolated from data published elsewhere. 3 refs.
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