Midea Commercial Air Conditioner (CAC) launched the high-efficiency, dual-stage, full falling film centrifugal chiller in 2013. The chiller is covered by 20 patents, 5 invention patents and 15 utility patents. These include the full falling film technology, dual-stage compression plus vapor injection technology, pre-whirl guide vane technology, intelligent control system, and others. The chiller’s initial coefficient of performance (COP) reached 7.06W/W at AHRI-standard conditions, and the integrated part load value (IPLV) reached up to 11.6. The new full falling film evaporator is designed to significantly improve the heat exchanging efficiency. Refrigerant charge volume is 40% lower than a flooded type chiller. The unit also uses free cooling technology, consuming no power during transition seasons.