In this case study, the application of adjustable-frequency inverters to drive the various fan and pump motors for the variable-air-volume (VAV) system in a high-rise office building in hot, humid climates is described. Methods for outside air admission and building pressure control are demonstrated. Energy conservation aspects are discussed.

KEYWORDS: variable volume air conditioning, air conditioning, air handling units, multistorey buildings, tropics, offices, inverters, controls, energy conservation.