ABSTRACT
The thermal design of a heat exchanger is directed to calculating an adequate surface area to handle the thermal duty for a given specification. Fluid friction effects in the heat exchanger are equally important since they determine the pressure drop of the fluids flowing in the system and, consequently, the pumping power or fan work input necessary to maintain the flow. The pumping power expenditure that is required to circulate each stream to flow through its heat exchange passage is as important as the heat transfer characteristics of a heat exchanger. A circular tube bundle is one of the most common heat transfer surfaces, especially in shell-and-tube heat exchangers. Helical and spiral coils are curved pipes which are used as curved tube heat exchangers in various applications such as dairy and food processing, refrigeration and air-conditioning industries, and medical equipment such as kidney dialysis machines. Bends are used in heat exchanger piping circuits and in turbulent heat exchangers.
