DESIGN AND FABRICATION OF DOUBLE PIPE HEAT EXCHANGER USING DIFFERENT HEAT TRANSFER ENHANCEMENT TECNIQUES

Abstract

A Heat Exchanger is a device use for the heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix or the fluids are directly in contact. To improve the heat transfer characteristic of double pipe heat exchanger, the various fin are installed on the outer surface of the inner tube and the level of turbulence increased and heat transfer characteristic of heat exchanger are increased up to 4 times than the plain tube. In many industries, we are using conventional heat transfer fluid such as water, mineral oil and ethylene glycol. However, the heat transfer efficiency decrease because of their low thermal conductivities. It has been found that the heat transfer rates of these conventional fluid can be increased by suspension of metallic nanoparticles. The suspended metallic nanoparticles can change the heat transfer characteristics of the base fluid.it is observed that there is an enhancement in heat transfer in the range approximately 12% - 16% There are Various Enhancement methods are used to increase performance of heat exchanger such as treated surfaces, rough surfaces etc