Log Mean Temperature Difference Calculator (LMTD Calculator) is a small but easy-to-use application that allows you to calculate the temperature driving force for heat transfer in flow systems. LMTD is used for the analysis of heat exchangers with constant flow rate and fluid thermal properties.
The formula used to obtain the LMTD is indeed a logarithmic average of the temperature difference between the hot and cold streams at each end of the exchanger. To use this formula the heat transfer coefficient has to be constant, and not a function of temperature.
To make the calculation, the next parameters are required: the Hot side Inlet Temperature, the Hot side Outlet Temperature, the Cold side Inlet Temperature, and the Cold side Outlet Temperature. It is very important to enter the four values in order to make the calculation. If one of the values is not available, it is preferable to use the Number of Transfer Units (NTU) Method to calculate the rate of heat transfer. If the result is larger, more heat will be transferred.
One advantage of the program is that you can change the unit of measurement to calculate the formula. You can introduce the values in Celsius, Fahrenheit, or Kelvin.
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