Abstract
In the present work, experiments were conducted to recover waste heat from water cooler condenser. A Tube in Tube Helical Coil (TTHC) heat exchanger was made from cu pipe of 4.47 mm outer diameter of inner tube and 8.30 mm inner diameter of outer tube replaced the water cooler condenser to recover the waste heat. A new empirical correlation was suggested to predict the annulus Nusselt number for laminar flow of water with Reynolds number ranging from 1500 to 3900 and Prandtl number approx 1.6. The results reveal that the annulus Nusselt number varies with volume flow rate through annulus of helical tube significantly in laminar flow region. The small scale water cooler equipped with TTHC heat exchanger recovered maximum 371.5 W heat by cooling water.
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