Steam turbine shaft power calculator

Multiply ideal enthalpy drop by mass flow and the specified turbine efficiency before converting to power.

Units

P = \frac{\dot{m} \times \left(h_{\text{in}} - h_{\text{out,s}}\right) \times \eta}{100 \times 3412}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

P = \frac{12{,}000 \times \left(1320 - 1150\right) \times 65}{100 \times 3412} \approx 388.6

Symbol	Meaning	Unit
$P$	estimated shaft power	kW
$\dot{m}$	steam mass flow	lb/h
$h_{\text{in}}$	inlet specific enthalpy	Btu/lb
$h_{\text{out,s}}$	isentropic outlet specific enthalpy	Btu/lb
$\eta$	isentropic shaft efficiency	%

Symbol	Meaning	Unit
$P$	estimated shaft power	kW
$\dot{m}$	steam mass flow	kg/s
$h_{\text{in}}$	inlet specific enthalpy	kJ/kg
$h_{\text{out,s}}$	isentropic outlet specific enthalpy	kJ/kg
$\eta$	isentropic shaft efficiency	%

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.