Question

Liquid propane enters a combustion chamber at 25ºC at a rate of 0.05 kg/min where it
is mixed and burned with 50 percent excess air that enters the combustion chamber at
7ºC. An analysis of the combustion gases reveals that all the hydrogen in the fuel burns
to H2O but only 90 percent of carbon burns to CO2, with the remaining 10 percent
forming CO. If the exit temperature of the combustion gases is 1500 K, determine :
i) The mass flow rate of the air
ii) The rate of heat transfer from the combustion chamber

Answer 1

Liquid propane enters a combustion chamber at 25ºC at a rate of 0.05 kg/min where it

is mixed and burned with 50 percent excess air that enters the combustion chamber at

7ºC. An analysis of the combustion gases reveals that all the hydrogen in the fuel burns

to H2O but only 90 percent of carbon burns to CO2, with the remaining 10 percent

forming CO. If the exit temperature of the combustion gases is 1500 K, determine :

i) The mass flow rate of the air

ii) The rate of heat transfer from the combustion chamber