Electric Heat Exchanger Calculation

Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations.

Electric heat exchanger calculation. T 2 239 140 99f. If two objects having different temperatures are in contact heat transfer starts between them. The lmdt is the logarithmic average of the temperature differences at each end of the heat exchanger. In an isolated system given heat is always equal to taken heat or heat change in the system is equal to zero.

For example suppose the final solution temperature is 140f and the temperature of the steam at 10 psi is 239f. Heat transfer coefficient in kw c m 2 that is specific to each type of equipment and given by the manufacturer. Determine the heat generated inside the enclosure. Approximations may be necessary.

For example if you know the power generated inside the unit assume 10 of the energy is dissipated as heat. These templates use s i. For heat transfer from the outside calculate the area exposed to the atmosphere except for the top of the control panel. The value of t 2 variation will be used in the basic equation a q u t.

The amount of heat given is equal to the amount of heat taken. To solve the basic equation a q u t you must first determine the value of. Exergy llc 320 endo boulevard garden city ny 11530 phone. 800 832 9375 or 516 832 9300 fax.

As you calculate the required surface area of the heat transfer device you see where each t value is used. Once lmdt and power have been calculated the heat exchanger calculation can be done as per the following formula.