Lee L Sibik

US Patent:

58132414, Sep 29, 1998

Filed:

Mar 24, 1997

Appl. No.:

8/823084

Inventors:

Lee Sibik - Onalaska WI
Mark Berget - Onalaska WI

Assignee:

Gas Research Institute - Chicago IL

International Classification:

F25B 1500

US Classification:

62148

Abstract:

A crystallization detection and recovery method for a two-stage absorption refrigeration machine is provided. Crystallization in the low temperature heat exchanger is detected through temperature comparisons between certain absorbent solution flows. The recovery sequence includes steps to remove crystallization and to prevent subsequent occurrences.

US Patent:

55864473, Dec 24, 1996

Filed:

Jul 20, 1994

Appl. No.:

8/278539

Inventors:

Lee L. Sibik - Onalaska WI
Mark D. Berget - Onalaska WI

Assignee:

Gas Research Institute - Chicago IL

International Classification:

F25B 1506

US Classification:

62141

Abstract:

A process for controlling an absorbent-refrigerant solution concentration in an absorption cooling system to prevent crystallization of the solution in which the crystallization temperature of the absorbent-refrigerant solution is calculated and the temperature of an absorbent-enriched solution, or strong solution, from the absorption unit heat exchanger is measured. Based upon the crystallization temperature and the measured absorbent-enriched solution temperature, the concentration of the absorbent is calculated using an iteration algorithm. Based upon the calculated concentration of absorbent in the absorbent-enriched solution, the concentration of the absorbent-enriched solution is adjusted by adjusting the heat input to the absorption system generator to prevent crystallization of the absorbent.

US Patent:

58097945, Sep 22, 1998

Filed:

Dec 17, 1996

Appl. No.:

8/768743

Inventors:

Lee L. Sibik - Onalaska WI
Daniel C. Leaver - La Crosse WI
Craig M. Goshaw - La Crosse WI

Assignee:

American Standard Inc. - Piscataway NJ

International Classification:

F25B 4104
G05D 1500

US Classification:

62204

Abstract:

A method of controlling an expansion valve in a refrigeration system. The method comprises the steps of controlling the modulation of the expansion valve based upon a first feedback control criteria; and controlling the modulation of the expansion valve based upon a second feed forward control criteria.

US Patent:

59504439, Sep 14, 1999

Filed:

Aug 8, 1997

Appl. No.:

8/910957

Inventors:

Jonathan M. Meyer - Onalaska WI
Ronald W. Okoren - Holmen WI
Lee L. Sibik - Onalaska WI
Daniel C. Leaver - La Crosse WI
Sean A. Smith - La Crosse WI

Assignee:

American Standard Inc. - Piscataway NJ

International Classification:

F25B 100

US Classification:

622285

Abstract:

A method of controlling compressor minimum capacity. The method comprises the steps of: measuring a first condition; comparing the first condition to a first setpoint to determine a first conditioned error; modulating compressor capacity relative to the first condition error; measuring a second condition; comparing the second condition to a second setpoint to determine a second condition error; and modulating compressor capacity relative to the second condition error if the magnitude of the second conditioned error is greater than the magnitude of the first conditioned error.

US Patent:

63181177, Nov 20, 2001

Filed:

Aug 22, 2000

Appl. No.:

9/643809

Inventors:

Daoud A. Jandal - La Crosse WI
Lee L. Sibik - Onalaska WI
Robin R. Lee - La Crosse WI
Michael P. Morse - West Salem WI

Assignee:

American Standard International Inc. - New York NY

International Classification:

F25B 3300

US Classification:

62497

Abstract:

A generator for an absorption chiller boils an absorption solution with steam heat by conveying the steam through a tube bundle with the steam flowing counter to the flow of solution. The tube bundle runs downhill in the direction of steam flow, while in some embodiments of the invention a bottom surface of the generator runs uphill in the direction of solution flow. The amount of solution in the generator is kept to an appropriately low level by submerging the tube bundle deeper at one end of the generator than the other.

US Patent:

58485350, Dec 15, 1998

Filed:

Mar 24, 1997

Appl. No.:

8/822012

Inventors:

Lee Sibik - Onalaska WI

Assignee:

Gas Research Institute - Chicago IL

International Classification:

G05B 501
G05D 1500

US Classification:

62 99

Abstract:

A control system for controlling overshoot in response to a setpoint input to the control system is provided. The control system includes a feedback loop connected to the control system via a summing node; and a binomial filter arranged to receive a setpoint input and to provide a filtered setpoint output to the control system via the summing node. The control system includes the binomial filter to provide a filtered setpoint output having a gradual initial response to the control system via the summing node. A method of controlling a water chiller system to provide a supply of leaving water at a preselected temperature is also provided. The method has the steps of: providing a control system for the water chiller system, the control system having an input; selecting a setpoint temperature; filtering the setpoint temperature using a binomial filter to provide a filtered setpoint; and providing the filtered setpoint to the input of the control system.

US Patent:

56321546, May 27, 1997

Filed:

Feb 28, 1995

Appl. No.:

8/396305

Inventors:

Lee L. Sibik - Onalaska WI
Daniel C. Leaver - La Crosse WI
Craig M. Goshaw - La Crosse WI

Assignee:

American Standard Inc. - Piscataway NJ

International Classification:

F25B 4100
G05B 1302

US Classification:

62 99

Abstract:

A method of controlling an expansion valve in a refrigeration system. The method comprises the steps of controlling the modulation of the expansion valve based upon a first feedback control criteria; and controlling the modulation of the expansion valve based upon a second feed forward control criteria.

US Patent:

60500980, Apr 18, 2000

Filed:

Apr 29, 1998

Appl. No.:

9/069788

Inventors:

Jonathan M. Meyer - Onalaska WI
Lee L. Sibik - Onalaska WI

Assignee:

American Standard Inc. - Piscataway NJ

International Classification:

F25B 4100

US Classification:

62213

Abstract:

A method of controlling an expansion valve including the steps of: measuring a primary system condition; determining an error in the primary system condition; measuring a secondary system condition; determining an error in the secondary system condition; and modulating the expansion valve based upon the larger of the first or second error.