A Review on Investigation of Performance of Pipe in Pipe Helically Coil Heat Exchanger

Enhancing the heat transfer by the use of helical coils has been studied and researched by many researchers, because the fluid dynamics inside the pipes of a helical coil heat exchanger offer certain advantages over the straight tubes, shell and tube type heat exchanger, in terms of better heat transfer and mass transfer coefficients. This configuration offers a high compact structure and a high overall heat transfer coefficient; hence helical coil heat exchangers are widely used in industrial applications. Convective heat transfer between a surface and the surrounding fluid in a heat exchanger has been a major issue and a topic of study in the recent years. In this particular study, an attempt has been made to experimental work of various parameters like radius of tubes, pitch of coil, pitch circle diameter, number of turns of helical coil, flow rate and temperature that affect the effectiveness of a heat exchanger and increases heat transfer rate at two different flows (parallel and counter-flow)on the total heat transfer from a helical tube, where the cold fluid flows in the outer pipe and the hot fluid flowing in the inner pipes of the pipe in pipe helical coiled heat exchanger. This paper focus on the review on helically coiled heat exchanger.