Method and apparatus for measuring and improving efficiency in refrigeration systems
First Claim
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1. A multivariate system for controlling a refrigeration system, comprising:
- a plurality of inputs which together represent a plurality of independent variables representing a thermodynamic operational state of the refrigeration system;
a memory storing data describing a thermodynamic predictive mathematical model of the refrigeration system associated with the plurality of inputs, the model being adaptively defined based on prior operational states of the plurality of inputs and having at least one adaptively defined timeconstant;
at least one processor, configured to receive the plurality of inputs, to access the stored model, to perform an analysis of the model with respect to the plurality of inputs to determine a probable deviance from an optimal operating point, and to determine change in the operational state of the refrigeration system to achieve a predicted most-efficient operational state; and
an output port configured to present an output signal representing the determined change in the operational state.
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Abstract
An apparatus for optimizing an efficiency of a refrigeration system, comprising means for measuring a refrigeration efficiency of an operating refrigeration system; means for altering a process variable of the refrigeration system during efficiency measurement; and a processor for calculating a process variable level which achieves an optimum efficiency. The process variables may include refrigerant charge and refrigerant oil concentration in evaporator.
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Citations
20 Claims
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1. A multivariate system for controlling a refrigeration system, comprising:
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a plurality of inputs which together represent a plurality of independent variables representing a thermodynamic operational state of the refrigeration system; a memory storing data describing a thermodynamic predictive mathematical model of the refrigeration system associated with the plurality of inputs, the model being adaptively defined based on prior operational states of the plurality of inputs and having at least one adaptively defined timeconstant; at least one processor, configured to receive the plurality of inputs, to access the stored model, to perform an analysis of the model with respect to the plurality of inputs to determine a probable deviance from an optimal operating point, and to determine change in the operational state of the refrigeration system to achieve a predicted most-efficient operational state; and an output port configured to present an output signal representing the determined change in the operational state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a refrigeration system, comprising:
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receiving a plurality of inputs which together represent a plurality of independent variables representing a thermodynamic operational state of the refrigeration system; storing data describing a thermodynamic predictive mathematical model of the refrigeration system associated with the plurality of inputs in a memory, the model being adaptively defined based on prior operational states of the plurality of inputs and having at least one adaptively defined timeconstant; performing an analysis of the model, using at least one automated processor, with respect to the plurality of inputs to; determine a probable deviance from an optimal operating point, and determine change in the operational state of the refrigeration system to achieve a predicted most-efficient operational state; and presenting an output signal representing the determined change. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for controlling a thermodynamic system comprising a compressible gas, a compressor, and an expander, comprising:
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receiving a plurality of inputs which represent a thermodynamic state of the compressor, and a thermodynamic state of the expander, and together having sufficient information to derive an efficiency of the thermodynamic system; storing data describing a mathematical model of the thermodynamic system associated with the plurality of inputs in a memory, the model being adaptively defined and having at least one dynamically changing timeconstant; performing an analysis of the model, using at least one automated processor, with respect to the plurality of inputs to; determine a probable deviance from an optimal efficiency, and determine change in an operational state of the thermodynamic system to achieve a state representing the optimal efficiency; and presenting an output signal for controlling the thermodynamic system selectively defined in dependence on the determined change.
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Specification