Analytical Investigation of R-407c & R-22 Flowing Through Adiabatic Helically Coiled Capillary Tube

Abstract

In this thesis, the effects of the relevant parameters on the flow characteristic of R-407C and R-22 flowing through adiabatic helical capillary tubes of copper and aluminum materials were theoretically studied. The capillary tubes' diameter, coil diameter, and parameters relating to flow conditions such as inlet and outlet pressures and temperatures were the major parameters investigated.

 In this thesis, the CFD analysis is to determine the heat transfer rate, pressure drop, velocity, mass flow rate and heat transfer coefficient for the fluids R-407C and R-22 with different tube and coil diameters. Thermal analysis is to determine the temperature distribution and heat flux for copper and aluminum as tube materials.

3D modeling is done inRhinoceros softwareand analysis is done in ANSYS software.

                Comparing with diameters of 25mm 30mm, 40mm and 50mm of capillary tube for both Copper and Aluminum materials, it is observed that it is better to use copper capillary tube with 25mm diameter with refrigerant R22 far better for capillary tube when compared to aluminum material at various coil diameters over a refrigerant R407c.