The furnace consists often burners each with a fuel capacity of 10 liters. The furnace consumed totally 100
liters /hour. Heat exchanger acquires 50% of burner capacity and assuming seven hours/day (one cycle/day), where
it runs 300 cycle/year. Improved heat exchanger model with fins has effectiveness of = 0.664, and the air
temperature was elevated from 414 to 443 . The effectiveness improvement after the implementation of fins over
the bare tubes was found to be 0.054