Patents by Inventor David J. Van Peursem

David J. Van Peursem has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Thermodynamic process control based on pseudo-density root for equation of state
    Patent number: 8165860
    Abstract: A system for thermodynamic modeling is provided. The system comprises a computer having a processor, a thermodynamic process simulation application, and a thermodynamic equation of state application. When executed by the processor, the thermodynamic equation of state application determines a density root based on a first and second point of departure from an equation of state and based on a first and a second extrapolation equation. The first departure point satisfies the equation ? P ? ? = ? ? P ? + ? . The second departure point satisfies the equation ? ? ( ? P ? ? - R ) + ( 1 - ? ) ? ( ? P ? ? ) ? | dp ? ? 1 = 0. The density root is determined as a pseudo-density in a phase two when the specified pressure is greater than the second departure point pressure and in a phase one when the specified pressure is less than the first departure point pressure.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: April 24, 2012
    Assignee: Invensys Systems, Inc
    Inventors: Gang Xu, David Bluck, David J. Van Peursem, Ian H. Boys
  • System and method for efficient computation of simulated thermodynamic property and phase equilibrium characteristics using comprehensive local property models
    Patent number: 7987082
    Abstract: A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: July 26, 2011
    Assignee: Invensys Systems, Inc.
    Inventors: David J. Van Peursem, Gang Xu
  • Thermodynamic Process Control Based on Pseudo-density Root for Equation of State
    Publication number: 20110054871
    Abstract: A system for thermodynamic modeling is provided. The system comprises a computer having a processor, a thermodynamic process simulation application, and a thermodynamic equation of state application. When executed by the processor, the thermodynamic equation of state application determines a density root based on a first and second point of departure from an equation of state and based on a first and a second extrapolation equation. The first departure point satisfies the equation ? P ? ? = ? ? P ? + ? . The second departure point satisfies the equation ? ? ( ? P ? ? - R ) + ( 1 - ? ) ? ( ? P ? ? ) ? | dp ? ? 1 = 0. The density root is determined as a pseudo-density in a phase two when the specified pressure is greater than the second departure point pressure and in a phase one when the specified pressure is less than the first departure point pressure.
    Type: Application
    Filed: August 25, 2009
    Publication date: March 3, 2011
    Applicant: INVENSYS SYSTEMS INC.
    Inventors: Gang Xu, David Bluck, David J. Van Peursem, Ian H. Boys
  • SYSTEM AND METHOD FOR EFFICIENT COMPUTATION OF SIMULATED THERMODYNAMIC PROPERTY AND PHASE EQUILIBRIUM CHARACTERISTICS USING COMPREHENSIVE LOCAL PROPERTY MODELS
    Publication number: 20100223040
    Abstract: A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.
    Type: Application
    Filed: February 1, 2010
    Publication date: September 2, 2010
    Inventors: David J. Van Peursem, Gang Xu
  • System and method for efficient computation of simulated thermodynamic property and phase equilibrium characteristics using comprehensive local property models
    Patent number: 7676352
    Abstract: A method of estimating a thermophysical property of a fluid using a local model is disclosed herein. The method includes generating, for use within the local model, a series expansion of thermodynamic equations relating to the thermophysical property and one or more derivatives involving the thermophysical property. The method further includes evaluating, based upon a set of specified values of parameters of the fluid, a first order term of the series expansion and a second order term of the series expansion. The values of the first order term and the second order term are then compared. A value of the thermophysical property is then automatically updated when the values of the first order term and the second order term are found to differ by more than a predefined amount.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: March 9, 2010
    Assignee: Invensys Systems, Inc.
    Inventors: David J. Van Peursem, Gang Xu