Heat Transfer and Energy Analysis of Tube in Tube Heat Exchanger and Validation Results with CFD

Energy is essential for the economic growth and social development of any country. The quality of life is closely related to energy consumption, which has continuously increased over the last few decades in developing countries. A solar thermal collector collects heat by absorbing sunlight. A collector is a device for capturing solar radiation. Solar radiation is energy in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths. A simple flat plate collector consist plate in an insulated box covered with transparent sheets. The most important part of a solar collector is the absorber, which usually consist of several narrow metal sheets aligned side-by-side. The fluid used for heat transfer generally flows through a metallic pipe, which is connected to the absorber strip. In plate-type absorber, two sheets are sandwiched together allowing the medium to flow between the two sheets. The outer casing which provides mechanical strength to the equipment is insulated to reduce the heat losses from back and side of the collector. Experimental investigation will be done on straight riser tube and zigzag riser tube on heat transfer enhancement, frictional factor. The heat transfer in the tube with zigzag riser tube is should be more as compared to straight riser tube. The increase in relative heat transfer coefficient of water for zigzag riser tube is higher % than straight riser tube. The relative decrease in frictional factor for zigzag riser tube than straight riser tube. The relative Reynolds number for zigzag riser tube higher than straight riser tube. The relative increase in Nusselt’s number for zigzag riser tubes higher than straight riser tube. If we increase the mass flow rate in the form of LPM the result for parameter temperature, pressure, and velocity will must be increase. The zigzag riser tube is better efficient than the straight riser tube.