Comparative Study of Helical Coil, Spiral Coil and Conical Coil (90O) Heat Exchanger for Single Phase Fluid Flow
Pramod S. Purandare, Rahul Shivaji Yadav, Anurag Nema, Atul Kulkarni, Swanand Kirpekar, Barister Giri, Prashant Patil, Manoj Jagdale, Anant Sidhappa Kurhade
Abstract
In the present study experimental analysis of the helical, spiral and conical coil with cone angle 90O for single-phase fluid flow is reported. Three different coil configurations are analysed under steady-state conditions. These three different coils (helical, spiral and conical coils) are formed with the same average coil diameter, tube diameter and tube length. For the analysis, an experimental setup with suitable instrumentation is developed. For each coil, sufficient numbers of test runs are conducted and readings are recorded with constant inlet temperature of cold and hot fluids as well as constant flow rate in every test run, to ensure the steady state. From the recorded results of the experimentation, heat transfer coefficients are calculated and the calculations are extended to calculate the Nusselt number (Nu) and effectiveness. The comparison of the results is presented from the analysis. Furthermore, the analysis is extended to predict the outlet temperature of hot and cold fluid, which shows good agreement with the experimental values. Major Findings: The helical coil exhibited the highest Nusselt number (Nu), while the spiral coil had the lowest Nu. The conical coil demonstrated intermediate Nu values. The effectiveness (ε) of the coiled tube heat exchanger is inversely proportional to the parameter Z. Consequently, the effectiveness of the system can be readily predicted using graphical patterns.