Integrated adaptive capacity control for a steam turbine powered chiller unit
First Claim
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1. A method of controlling the capacity of a chiller system driven by a steam turbine, the method comprising the steps of:
- providing a steam system having a steam supply, a steam turbine and a steam condenser connected in a steam loop;
providing a refrigerant system having a compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop, wherein the compressor is driven by the steam turbine;
sensing a value representative of a load of the refrigerant system;
determining a system pressure differential of the refrigerant system; and
controlling a speed of the steam turbine in response to the sensed load value and the determined system pressure differential to control capacity of the chiller system.
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Abstract
A control system for a steam turbine driven chiller unit is provided. The control system automatically utilizes the full range of the governor, compressor pre-rotation vanes, and hot gas bypass valve capabilities to control the capacity of the chiller and provide anti-surge and override control functions to prevent undesirable operational ranges while maintaining maximum efficiency of operation.
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Citations
27 Claims
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1. A method of controlling the capacity of a chiller system driven by a steam turbine, the method comprising the steps of:
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providing a steam system having a steam supply, a steam turbine and a steam condenser connected in a steam loop; providing a refrigerant system having a compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop, wherein the compressor is driven by the steam turbine; sensing a value representative of a load of the refrigerant system; determining a system pressure differential of the refrigerant system; and controlling a speed of the steam turbine in response to the sensed load value and the determined system pressure differential to control capacity of the chiller system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A chiller system comprising:
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a steam system comprising a steam supply, a steam turbine and a steam condenser connected in a steam loop; a refrigerant system comprising a compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop, wherein the compressor is driven by the steam turbine; and a central control panel to control operation of both the steam system and the refrigerant system, the central control panel comprising a capacity control system, the capacity control system being configured to adjust a speed of the steam turbine to control the capacity of the refrigerant system in response to a leaving chilled liquid temperature and a system pressure differential. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A chiller system comprising:
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a steam system comprising a steam supply, a steam turbine and a steam condenser connected in a steam loop; a refrigerant system comprising a compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop, wherein the compressor is driven by the steam turbine; a turbine baseplate configured and disposed to mount the steam turbine in the chiller system, the turbine baseplate comprising a coupling device to rigidly connect the turbine baseplate and the compressor; and a central control panel to control operation of both the steam system and the refrigerant system. - View Dependent Claims (25, 26, 27)
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Specification