Homework 3-1: Consider that one kg of air is fed to a flame at 500°C and is heated to 1200°C. It then rises and heats a metal product from 25°C to 400°C, then exhausts out the chimney.
a. How much heat is added to one kg of air as it goes through the flame (kJ)?
b. How much heat is extracted from the kg of air as it travels across the steel product (kJ)? (Assume that the combustion gas temperature drops to 400°C).
c. What percent of the heat in part a. does this represent?
d. How much of the original heat is lost with the combustion gases as they go up the chimney?
e. To combustion technicians, the term available heat refers to the heat that actually reaches the product (part b).
f) What percent of the heat in part a. is 'available'?
