A Comparative Experimental Studies on Effect of Twisted Tape Insert on Performance of Plane Steel Tube and Plane Copper Tube DPHE

Work presents the effects of twisted tape inserts of different materials and different twist ratio on the performance of concentric double pipe heat exchanger by using air and water as working medium. The twisted tape inserts when placed in the path of the flow of the fluid, create a high degree of turbulence resulting in an increase in the heat transfer rate of heat exchanger with the twisted-tape inserts is found to be strongly influenced by tape-induced swirl or vortex motion. The conversion utilization and recovery of energy in every industrial commercial and domestic application involve a heat exchanger process some common example are stream generation and condensation in power and co-generation plant ,sensible heating and cooling on viscous media in thermal processing of chemical, and agriculture products refrigerant evaporation and condensation in air conditioning and refrigeration gas flow heating in manufacturing and waste heat recovery air and liquid cooling of engine of electrical machine and electronic device improve heat exchange, over and above the usual of standard practice can significantly improve the thermal efficiency in such application as well as the economically of their design and operation. Double pipe heat exchanger (DPHE) is the simplest application of heat exchanger. This kind of heat exchanger is widely used in chemical, food and oil gas industries. Double pipe heat exchanger is having a relatively small diameter and it is easy to fabrication a compare a helical tube and straight tube and many more compact tube of heat exchanger. Commonly method used to by the reaches to enhance the heat flow rate is active method, passive method and present work is based on passive method. In the present work experiment this carried out on double pipe heat exchanger in which hot water is flowing through in a tube where a cold water is flowing through the annular and hot water to water heat exchanger is taken in consideration. During the experiment cold water flow rate is constant at 45 LPH, where the hot water flow rate on various from 15 LPH to 75 LPH. In this experiments we have used the twisted tap insert with 2.5 inch pitch with copper tube and plain steel tube and plain copper tube without insert in parallel and counter flow arrangement and then comparatively study on their performance.