The objective of this invention is to increase the resident time of coolant in the shell side of the helical coil heat exchanger by using flower baffle plates. This invention utilized to improve the heat transfer efficiency of the helical coil heat exchanger. The heat exchanger contains a hollow shell and helical coil as same as in a normal shell, In addition to it contains a flower baffle plate. The baffle plates are placed inside the shell side of heat exchanger in distance between two coils. These baffle plates arrange to reduce the pressure drop and fouling in heat exchanger with these arrangements of baffle plates, the heat exchanger can obtain a fully developed flow . The hot fluid flows through the helical coil in heat exchanger. The tube side flow rates varies from 2lpm to 6 lpm and shell side flow rates (2, 4, 5, 6, 8 lpm), respectively. The experiment is done for all the 10 cases to find the effective one. Also done the CFD analysis to validate the experiment values, the CFD results are good in agreement with the experiment results within an error percentage of 15%. The outlet temperature of the tube and shell side, effectiveness and exergy efficiency of heat exchanger also calculated and presented graphically.