Patent ID: 8336324
Filing Date: 2012-12-25
Classification: F04D

Abstract:
1. A turbo chiller comprising: a turbo compressor, equipped with a first impeller and a second impeller disposed downstream of the first impeller, for compressing a refrigerant in two stages; a condenser for condensing the refrigerant compressed by the turbo compressor; an expansion valve for expanding the refrigerant condensed by the condenser; and an evaporator for evaporating the refrigerant expanded by the expansion valve, a first inlet guide vane and a second inlet guide vane for regulating intake refrigerant flow rates being provided at respective refrigerant intakes of the first impeller and the second impeller of the turbo chiller; and comprising a control unit for controlling degrees of opening of the first inlet guide vane and the second inlet guide vane, wherein the control unit is provided with a slave mode in which the second inlet guide vane is operated so as to be dependent on the first inlet guide vane and an independent mode in which the degree of opening of the second inlet guide vane is increased independently of the first inlet guide vane.