Experimental Investigation of Performance of Spiral Coil in Spiral Tube Heat Exchanger

In the present work of experimental investigation, heat transfer performance of Spiral Tube Heat Exchanger (STHE) is studied by manufacturing the heat exchanger. STHEs are known as excellent heat exchanger because it is compact in size and having high heat transfer ability. The STHE consists of copper coils in the spiral shape and placed inside the shell which is made of Stainless Steel. The spiral shape coil is made by bending the straight copper tube of 10 [mm] inside diameter. The heat exchanger uses 3 such spiral coil brazed with straight header copper tube of 25 [mm] inside diameter and at a distance of 15 [mm] apart, the number of turn in a spiral coil is four. Pump is used for circulation of water in both loops. Cold water is circulated through spiral coil, which is entering at the periphery and comes out from centre of the heat exchanger; hot water is entering at the bottom centre of shell and comes out from the top of the shell. The inlet temperature range of hot water and cold water is 60 to 80[degrees C] and 30 to 48[degrees C]. Mass flow rate of hot water and cold water is from 0.0633 [kg/s] to 0.0833[kg/s] and 0.01[kg/s] to 0.0833[kg/s].