Comparative Experimental Study on Effect of Twisted Tape Insert Between Left Hand Twist over Full Length and Left Hand Twist for the First Half and Right Hand Twist for Second Half of the Length on Performance of Double Pipe Corrugated Tube Heat Exchanger

The main aim of this comparative analysis is to determine the relative advantage of using a straight steel tube heat exchanger with respect to a straight corrugated steel tube heat exchanger. Straight tube is easier in fabrication of heat exchanger tube. So straight tube heat exchanger offer advantageous over helical tube, corrugated tube and many more compact tube type heat exchangers. In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall heat transfer coefficient, effect of cold-water flow rate on effectiveness of heat exchanger when hot water mass flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept constant studied and compared for parallel flow, counter flow arrangement of Straight steel tube and Straight corrugated steel tube heat exchangers. And also both are compared with full length clock wise and other one which has half clock wise twisted and half anticlock. All readings were taken at steady state condition of heat exchanger. The result shows in the graphical representation for effectiveness of both tubes in different flow arrangement with and without insert, Effectiveness of heat exchanger is decreases in both straight steel and corrugated steel tube when hot water mass flow rate varies and cold water flow is fixed and straight corrugated steel tube effectiveness is higher than the plane steel tube heat exchanger and also effectiveness with insert is higher than without insert. And bidirectional insert gives more effectiveness than unidirectional insert.