STUDY OF DOUBLE PIPE HEAT EXCHANGER USING WASHER INSERTS TO IMPROVE HEAT TRANSFER RATE

Researchers have done several researches on heat transfer enhancement in tube by inserting various tapes in last few years. There is need to improve the thermal performance of heat exchangers, thereby reducing size of heat exchanger and saving of material, effecting energy & cost led to development & use of heat transfer augmentation techniques. This research has been worked out to study the effect of washer inserts with various designs on heat transfer rate in double pipe heat exchanger. The experiment was conducted for hot water temperature up to 70°C using washers having 2, 3 and 4 slots. The experimental results indicate that the pipe with the washer inserts provides considerable improvement of the heat transfer rate over the without washer pipe.