Liquid ethanol (CH₄) is burned completely with 55% excess air during a steady-flow combustion process. If both the reactants and the products are maintained at 25°C and 1 atm and the water in the products exists in the liquid form, the heat transfer from the combustion chamber per unit mass of fuel is

Question

Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
T= 25 "C"
P=1 "atm"
EXCESS=0.55
"Heat transfer in this case is the HHV at room temperature,"
HHV_CH4 =29.67 "MJ/kg"
LHV_CH4 =26.81 "MJ/kg"
"Some Wrong Solutions with Common Mistakes:"
W1_Q=LHV_CH4 "Assuming lower heating value"
W2_Q=EXCESS*hHV_CH4 "Assuming Q to be proportional to excess air"

Liquid Ethanol (CH4) Is Burned Completely with 55% Excess Air

Liquid Ethanol (CH₄) Is Burned Completely with 55% Excess Air