20 September 2011
A control system for reducing energy consumption in variable refrigerant flow
(VRF) has been developed and the effectiveness of the system has been verified by applying it to actual operations in several facilities. The algorithm for this system enables VRFs to maintain the coefficient of performance at a higher level than that achieved by conventional operation by monitoring and controlling the operational mode of VRFs. The energy saving achieved by this system was verified to be up to 30% in one facility, and up to 20% in the other facility, both in the summer and in the winter.