Patents by Inventor Stephen M. Zardus

Stephen M. Zardus 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).

  • Systems and methods for controlling a refrigeration system
    Patent number: 11774154
    Abstract: A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.
    Type: Grant
    Filed: June 13, 2022
    Date of Patent: October 3, 2023
    Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
    Inventors: William L. Kopko, Stephen M. Zardus, Israel Federman, Curtis C. Crane, Todd Kwao-vovo
  • SYSTEMS AND METHODS FOR CONTROLLING A REFRIGERATION SYSTEM
    Publication number: 20220316780
    Abstract: A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.
    Type: Application
    Filed: June 13, 2022
    Publication date: October 6, 2022
    Inventors: William L. Kopko, Stephen M. Zardus, Israel Federman, Curtis C. Crane, Todd Kwao-vovo
  • Systems and methods for controlling a refrigeration system
    Patent number: 11359847
    Abstract: A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: June 14, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: William L. Kopko, Stephen M. Zardus, Israel Federman, Curtis C. Crane, Todd Kwao-vovo
  • SYSTEMS AND METHODS FOR CONTROLLING A REFRIGERATION SYSTEM
    Publication number: 20190186801
    Abstract: A refrigeration system includes a heat exchanger configured to place a cooling fluid in a heat exchange relationship with a working fluid, a free-cooling circuit having a pump configured to circulate the working fluid through the heat exchanger and a condenser, a flow control valve configured to control a flow rate of the working fluid to the condenser, a condenser bypass valve configured to control a flow rate of the working fluid that bypasses the condenser, and a controller configured to adjust a position of the flow control valve, a position of the condenser bypass valve, a speed of a fan of the condenser, a speed of the pump, and a temperature of a heater based on an ambient temperature, a temperature of the working fluid leaving the condenser, the position of the flow control valve, the position of the condenser bypass valve, or a combination thereof.
    Type: Application
    Filed: August 22, 2017
    Publication date: June 20, 2019
    Inventors: William L. Kopko, Stephen M. Zardus, Israel Federman, Curtis C. Crane, Todd Kwao-vovo