Heat Transfer Calculator

To approximate the results of a heat transfer system; enter the fluid data and enter 5 of the 6 available inputs under Flow Rates and Temperatures. A box will be highlighted yellow if it needs input. The currently calculating value will always be highlighted in green.

Cold Side Hot Side
% Glycol vs. Water
Flow Rate
Inlet Temp
Ooops. Your inlet temperature on the cold side needs to be less than your inlet temperature on the hot side.
Outlet Temp
Ooops. Your cold outlet temperature can't be hotter than the hot inlet temperature.
Your outlet temperature must be hotter than your inlet temperature.
Your outlet temperature must be colder than your inlet temperature.
Average Temp
Log Mean Temp Diff
Mass Flow Rate
Specific Heat
Heat Load

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Assumptions: Calculation assumes true counter flow.
Only Sensible Heat Transfer occurs.
Air is assumed to be dry, at atmospheric pressure and at zero elevation.
Liquids are considered incompressible.
Fluid properties are used at the average temperatures.
Fluid temperature ranges from 40°F to 200°F
ACFM is assumed to be at the average air temperature.
Air units in m3/s are assumed to be actual.
Since fluid properties can vary by manufacturer and chemical composition, the properties stated may not be exactly representative of the actual conditions.
This Heat Transfer Calculator is intended to be used to approximate a heat transfer system and is not intended to provide engineering recommendations. Every effort has been made to ensure the accuracy of the Heat Transfer Calculator on this site, however, since fluid properties vary by manufacturer, chemistry, composition and site conditions and we cannot make a guarantee or be held responsible for any errors that have been made. If you spot an error on this site, we would be grateful if you could report it to us by using the contact link at the top of this page and we will review the data and correct it as soon as possible.