Performance Anlaysis of Water-Cooled VRF System in Cooling Mode by Changing Scroll Compressor Geometry

In this study, the performance of water-cooled variable refrigerant flow (VRF) system was evaluated through static numerical simulation by changing scroll compressor geometry. The parameters used in the evaluation are the wrap height of the scroll compressor and the basic circle radius. To determine the best combination of geometry under given conditions, the mass flow rate, condensation pressure, evaporation pressure, power consumption, COP, and IEER were calculated. As a result of the analysis, the VRF performance was evaluated to be better where the height of the compressor is lower, and the radius of the basic circle is smaller. However, considering the COP, the optimal variable combination is the wrap height of 4 mm, which is 1 mm higher than the previous value, and the basic circle radius of 1.6 mm which is the previous value. In the optimal parameter combination, COP improved by 3.73% and the IEER by 5.04%.