16 September 2011
VRF (Variable Refrigerant Flow) system is the air conditioning system that has
some indoor units. This system is widely used for the building because it can be easily equipped with the building, and save the 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 grasp their
performance because the indoor units are driven separately in the different unsteady state indoor conditions, and the refrigerant flow and control method are very complex.