Problem
Find fuel for 12,000 kg/h steam when enthalpy rise is 2,300 kJ/kg, GCV 40,000 kJ/kg and efficiency 80%.
Formula
mf = msΔh/(η×GCV)
Solution
mf=12,000×2,300/(0.80×40,000).
Answer
862.5 kg/h
Engineering check
Verify units, magnitude, assumptions and physical meaning before accepting the result.