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A method of driving a large cooling system having a compressor operating as a chiller driven by a prime mover, such as a gas turbine, reciprocating engine or steam turbine, in conjunction with an electric motor/generator coaxially arranged on a common shaft with the other units, so that as the ambie

A method of driving a large cooling system having a compressor operating as a chiller driven by a prime mover, such as a gas turbine, reciprocating engine or steam turbine, in conjunction with an electric motor/generator coaxially arranged on a common shaft with the other units, so that as the ambient temperature rises and the power needed to produce the cooling output increases, and as there is a corresponding drop in power output if the prime mover is a gas turbine or condensing steam turbine, the required additional driving power is supplied by the motor. Conversely, as the ambient temperature drops and required cooling power lessens, the electric motor operates as a generator to convert the excess prime mover power to electrical power.

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Apparatus for enhancing the efficiency of a large cooling system, comprising: prime mover means for producing rotary output power at a predetermined, substantially constant, speed at a drive shaft thereof; compressor means for compressing a gas as a refrigerant and producing cooling for a large cool

Apparatus for enhancing the efficiency of a large cooling system, comprising: prime mover means for producing rotary output power at a predetermined, substantially constant, speed at a drive shaft thereof; compressor means for compressing a gas as a refrigerant and producing cooling for a large cooling system, said compressor means having a drive shaft mechanically coaxially fixedly coupled to said drive shaft of said prime mover means, whereby said rotary output power is transferred to said compressor means to cause said compressor means to operate continuously at said predetermined, substantially constant, speed; and synchronous electrical motor means electrically connected to an electrical power grid of substantially constant voltage and frequency, said motor means having a drive shaft mechanically coaxially fixedly coupled with said drive shaft of said prime mover means and said drive shaft of said compressor means for operating at said predetermined, substantially constant, speed, whereby when said prime mover means produces rotary power at less than said predetermined speed said motor means draws electrical power from said power grid and causes said compressor means to operate at said predetermined speed and when said prime mover means produces rotary power at more than said predetermined speed said motor means supplies electrical power to said power grid.