Electric Heat Exchanger Calculation

As you calculate the required surface area of the heat transfer device you see where each t value is used.

Electric heat exchanger calculation.

The amount of heat given is equal to the amount of heat taken. In an isolated system given heat is always equal to taken heat or heat change in the system is equal to zero. Determine the heat generated inside the enclosure. Heat transfer coefficient in kw c m 2 that is specific to each type of equipment and given by the manufacturer.

For heat transfer from the outside calculate the area exposed to the atmosphere except for the top of the control panel. Calculate the required heat transfer area based on values needed. If two objects having different temperatures are in contact heat transfer starts between them. To solve the basic equation a q u t you must first determine the value of.

The value of t 2 variation will be used in the basic equation a q u t. For example if you know the power generated inside the unit assume 10 of the energy is dissipated as heat. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger.

The lmdt is the logarithmic average of the temperature differences at each end of the heat exchanger. Calculations of heat transfer conservation of energy theorem is also applied to heat transfer. Approximations may be necessary. 800 832 9375 or 516 832 9300 fax.

Once lmdt and power have been calculated the heat exchanger calculation can be done as per the following formula. For example suppose the final solution temperature is 140f and the temperature of the steam at 10 psi is 239f.