Influence of Coil Pitch on Thermo-Fluid Characteristics for Square Channel Spiral Coil Sub-Cooled Condenser

Abstract

This research paper describes the effect of coil pitch on thermo-fluids characteristics of the spiral coil sub-cooled condenser. Primarily, the heat transfer results for channel size of 4.1 mm X 4.1 mm were experimentally found and validated with the CFD analysis. As the satisfactory agreements were obtained with smaller errors, the effect of the different coil pitch with the same height on the heat transfer has been examined by using the CFD analysis. Finally, the coil pitch with 6.2 mm leads to the higher velocity of secondary flow of 0.05 m/s, while 13.7mm pitch depicts the lower value of 0.03 m/s inside the square cross-section of the channel. Corresponding to the specific pitch sizes, the heat transfer coefficient depicts high value for the largest pitch size and least for the smallest pitch.