a) Gas from a combustion unit is cooled to 100 Celsius and then expelled to atmosphere via a chimney. The air in the atmosphere at the level of the top of the chimney is at 30 Celsius on the hottest day of the year. The combustor operates with 20% excess air and combustion is even (such that no soot or CO is produced). Assume that both air and the combustion gases obey the ideal gas equation, that air is 4N2 + O2 and that the fuel is heavy fuel oil: approximates to (CH2)n. What is the density of the air? What is the density of the flue gas? By what % is the effluent flue gas lighter than the surrounding air?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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a) Gas from a combustion unit is cooled to 100 Celsius and then expelled to atmosphere via a chimney. The air in the atmosphere at the level of the top of the chimney is at 30 Celsius on the hottest day of the year. The combustor operates with 20% excess air and combustion is even (such that no soot or CO is produced). Assume that both air and the combustion gases obey the ideal gas equation, that air is 4N2 + O2 and that the fuel is heavy fuel oil: approximates to (CH2)n. What is the density of the air? What is the density of the flue gas? By what % is the effluent flue gas lighter than the surrounding air?

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