Energy Transfer Equation
Calculator for fluid energy transfer using the equation Q = m × cp × ΔT, where Q is the quantity of energy transferred, m is the mass of substance, cp is the specific heat, and ΔT is the temperature difference.
Formula
Q = m × cp × ΔT
Where:
- Q = Quantity of energy transferred (kJ, Btu)
- m = Mass of substance (kg, lb)
- cp = Specific heat of the substance (kJ/kg°C, kJ/kg°K, Btu/lb°F)
- ΔT = Temperature difference (°C, K, °F)
Example
2 kg of water is heated from 20°C to 60°C. The specific heat of water is 4.2 kJ/kg°C.
Calculation:
- Q = (2 kg) × (4.2 kJ/kg°C) × ((60°C) - (20°C))
- Q = (2) × (4.2) × (40)
- Q = 336 kJ
- Q = 336 kWs × (1/3600 h/s) = 0.093 kWh