Experimental and Numerical Investigation on Heat Transfer in Helically Coiled Tube Heat Exchanger Under Constant Wall Heat Flux

Waste heat recovery from helically coiled tube heat exchanger of a household refrigerator system is attractive due to its free energy consumption for residential and commercial hot water production. In this chapter, we present an experimental and numerical investigation on a modified household refrigerator for hot water production useful for domestic purpose. This device helps undergraduate mechanical engineering students in understanding the basic natural heat transfer phenomenon between the helical condenser coil and the water in the tank. From the results, after 300 min of heating, the maximum water temperature achieved in the cylindrical tank is 51 °C. Therefore, this modified refrigerator can be utilized in hotels, industry and domestic purposes which need hot water.