September 1998

Process Technology/Environment

Calculate water in combustion air

A simple procedure estimates combustion-air moisture from wet- and dry-bulb temperatures

Kunz, R. G., Air Products and Chemicals, Inc.

Unless air is perfectly dry, vapor-phase moisture is carried into a combustion process. The concentration of water vapor in air used in combustion is determined by the temperature, pressure, and degree of moisture saturation of the ambient atmosphere. Even if the combustion air is preheated for heat recovery, its water-vapor content still depends on ambient conditions. The method presented calculates air moisture in a straightforward technique without recourse to a psychometric chart or humidity table. It is easily incorporated into programmed calculations for combustion processes. Multiple steps are used without iterations. A sample problem summarizes results for several cases. Estimating

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