Abstract: Heat exchanger plays very important energy role in the industries. In this study the effect of liquid on HT flow rate was studied using a lab scale shell and tube heat exchanger (length-39 cm, shell diameter 9 cm, tube diameter 0.62 cm). Also the effect of cold and hot fluid on heat transfer rate, effect of mass concentration of fluid (liquid) was studied. This work deals with the experimental investigation of thermal conductivity and specific heat capacity of fluids as a function of a temperature and concentration of liquid with respect to water. Also, coolants in heat exchanger are used to access their feasibility and performance in heat transfer devices. Overall good results were obtained with experimental work results on thermal conductivity and heat capacity of liquids as well as the estimation of heat transfer areas in a model shell and tube heat exchanger reveal that aqueous chemicals possess superior thermal conductivity and heat capacity and require less heat transfer areas as compared to those of their base on other liquids. This novel class of liquids shows great potential for advanced heat transfer applications. The enhancement heat transfer of the heat transfer devices can be done by changing the fluid transport.

Keywords: Heat transfer, Shell and Tube Heat Exchanger, optimization.