App description

Enter the value and click "Calculate" to display the result

<img src="http://drr.ikcest.org/static/upload/35/3560bdda-ebd7-11e9-9ea9-00163e0618d6_m.jpg" />

T₁ = Inlet hot fluid temperature

T₂ = Outlet hot fluid temperature

t₁ = Inlet cold fluid temperature

t₂ = Outlet cold fluid temperature

The logarithmic mean temperature difference (method) is used to determine the driving force of the heat transfer temperature in the flow system. The method is the logarithmic mean temperature difference between the hot and cold water streams at the ends of the heat exchanger.

This calculator is used to calculate the logarithmic mean temperature difference (ie parallel flow of heat, liquid or gas, both from left to right, so that the cold flow is the same).

Larger logarithmic mean temperature difference, more heat is transferred. The method is used directly from a constant flow and thermal analysis of fluid heat transfer.

Usage example

Input data:

Inlet hot fluid temperature (T1): 45°F

Outlet hot fluid temperature (T2): 25°F

Inlet cold flow temperature (t1): 20 °F

Outlet cold flow temperature (t2): 15°F

Click on calculation to output data

Logarithmic mean temperature difference (LMTD): 13.9528 °F