In this study,the performance of the VRF systems applying a bypass cycle and injection cycle usinga sub-cooler is compared by numerical method. In the simulation for a multi-split variable refrigerantflow(VRF) system, it is important to predict the input power and mass flow rate of a scroll compressorwith considering the refrigerant injection process in a compression chamber, and pressure drop andheat transfer in pipe lines between an outdoor unit and indoor units. Therefore, the simulation for amulti-split VRF system was developed with considering those, and validated with experimental data.The bypass and refrigerant injection have improvement potential to increase the cooling capacitydue to increasing enthalpy difference in an evaporator. The refrigerant injection cycle has moreimprovement potential of performance than bypass cycle. Sub-cooling degree at inlet of EEV isabove 10°C degree in two cycles, which can avoid flash gas generation.
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