MBT provided 20 high efficiency centrifugal chillers and 4 inverter direct-drive centrifugal chillers in the renovated project. Midea inverter direct-drive centrifugal chiller has less refrigerant charge and lower noise, COP is up to 6.399, and owns more than 20 technology patents. Full ranges of Midea centrifugal chillers have been certified by AHRI and adopt full falling film technology which can save refrigerant charging volume by 40%.