Water heat rate from field readings calculator

Use measured water flow and temperature difference for ordinary water; density and heat-capacity changes may require correction.

Units

q_{\text{water}} = 500 \times Q_{\text{water}} \times \Delta T

Calculator

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

Given

q_{\text{water}} = 500 \times 38 \times 12 = 228{,}000

Symbol	Meaning	Unit
$q_{\text{water}}$	water heat transfer rate	Btu/h
$Q_{\text{water}}$	measured water volume flow	gpm
$\Delta T$	water temperature difference	°F

Symbol	Meaning	Unit
$q_{\text{water}}$	water heat transfer rate	kW
$Q_{\text{water}}$	measured water volume flow	L/s
$\Delta T$	water temperature difference	K

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