Study on a fan coil unit and chiller by an intelligent control method with a stepless variable speed driving technology

The experimental results show that the measured long-term accumulated energy consumption of FCU was decreased from 4.5582 kWh to 2.888 kWh (the comparison between AC and BLDC motors), and the measured long-term accumulated energy consumption of ACH was decreased from 41.3 kWh (without SVFVR) down to 26.64 kWh (with SVFVR). The energy saving rate was calculated at 36.6% (energy saving rate for using BLDC) and 35.5% (energy saving rate for using SVFVR), respectively, to verify the energy efficiency of using the proposed stepless variable speed driving technology in FCU and ACH.