Abstract
Air is a convenient and inexpensive source of oxygen for most combustion processes. However, the oxygen content of the air varies with temperature and humidity. Changes in temperature affect the mass of oxygen per unit volume of air, and changes in humidity directly affect the volume percentage of oxygen. Since most ratio systems are unaware of changes in oxygen content of the air, the preset excess air rate will vary. This paper quantifies these variations and the method of calculation for any temperature and humidity variations. Also shown are the minimal effects of higher excess air rates on fuel consumption when preheated combustion air is used.
Ferri, J. L. (1984). Meteorological Effects on Air/Fuel Ratio. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from
https : / /hdl .handle .net /1969 .1 /94677.