16 September 2011
VRF (Variable Refrigerant Flow) system is the air conditioning system that has
some indoor units. This system is widely used for office buildings because it can be easily equipped with those buildings, and save space and cost. So far, the air-conditioning system is mainly evaluated at the rated point using COP but recently it is demanded to improve the annual efficiency of the air conditioning system. For VRF systems, it is difficult to evaluate
their performance because the indoor units are driven separately in the different indoor conditions, and the refrigerant flow and control method are very complex. We built a performance test facility for VRF system, and studied the steady state performance of the
VRF system that has four indoor units, experimentally. The rated cooling capacity of the VRF system is 28.0. This experiment was carried out, based on the JIS standard. Detailed part load efficiency of the system was clarified by the experiment.