A REVIEW ON HEAT TRANSFER ENHANCEMENT METHOD IN HEAT EXCHANGERS BY USING INSERTS

Energy crisis is becoming a major problem which is faced by all over the world. In order to control this energy crisis problem many research are performed using renewable energy sources like using solar energy instead of electrical and fuel energy, because solar energy is free of cost and environmentally friendly. There have been many studies to improve the performance of the solar water heater. Heating water for domestic purpose is a simple and effective way of utilizing solar energy. Initial cost of solar water heating system is high but we get zero green energy cost. The specific objective of this study is to find or develop new models and models that can improve the efficiency of the solar water heater. This investigation discusses improving the performance of a flat plate solar water heater by inserting the twisted tape type of insert in the riser tubes. They promote higher heat transfer coefficient by disturbing or altering the existing flow behaviour (except for extended surfaces) which also leads to increase in the pressure drop.