Problem
Feedwater flow is 20,000 kg/h and temperature rises by 45°C. cp=4.187 kJ/kg K.
Formula
Q=m cp ΔT
Solution
Q=20,000×4.187×45.
Answer
3,768,300 kJ/h or 1,046.75 kW
Engineering check
Verify units, magnitude, assumptions and physical meaning before accepting the result.