Enhancement in Heat Transfer Rate in a Pipe in Pipe Heat Exchanger Using Helical Insert

Abstract

Abstract

Heat transfer enhancement techniques are frequently used in heat exchanger system in order to increase the rate of heat transfer and improve the thermal performance of the system. This paper contains experimental study on enhancement in heat transfer rate using helical insert. The inner tube used was of copper with inner and outer diameter of 11.8 mm and 12.7 mm, respectively, and outer tube was galvanized iron, which was insulated with styrofoam. The working fluid used was water. Hot water was circulated through the inner tube and cold water through the annular area. Insert was inserted inside the copper tube. Observations were recorded by keeping hot water inlet temperature constant and varying the mass flow rates of hot and cold water. The heat exchanger using helical insert showed an average increase of 30.47% in the heat transfer rate as compared to plain tube. The maximum increase in heat transfer coefficient and effectiveness was found to be 52.07% and 24.63%, respectively.

Keywords: Heat exchangers, heat transfer rate, helical insert, mass flow rate

Cite this Article

Lanjewar PB, Braganza Pranit, Lal Manish et al. Enhancement in heat transfer rate in a pipe in pipe heat exchanger using helical insert. Journal of Thermal Engineering and Applications. 2018; 5(2): 5–12p.