Air conditioning system design for China Resources Building

The building adopts four-pipe variable flow water system and free cooling source by cooling tower in winter. Air conditioning system is all-air VAV system with inner and peripheral zoning, controlled by constant static pressure point at single duct. The fans are  variable frequency operated. The standard floors adopt ring-form ducting. The VAV terminal devices are of pressure-independent throttling type. The inner zone is cooled all the year, and peripheral zone adopts hot water reheating coils. Fresh air is centrally handled and controlled by means of constant volume and variable fresh air ratio to obtain enough fresh air at every floor.