Patents by Inventor Fred Ahlstrom

Fred Ahlstrom 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).

  • METHODS AND SYSTEMS FOR CONTROLLING WORKING FLUID IN HVACR SYSTEMS
    Publication number: 20220049886
    Abstract: Methods and systems for controlling working fluid flow in a heating, ventilation, air conditioning and refrigeration (HVACR) unit for an HVACR system are disclosed. The unit includes a compressor having a motor and a drive. The unit also includes a condenser fluidly connected to the compressor. A subcooler is located downstream of the condenser. The unit further includes an evaporator fluidly connected to the condenser. Also the unit includes a controller. The unit also includes a bypass assembly connected to the condenser. The bypass assembly includes a bypass flow control device and a bypass fluid line controlled by the bypass flow control device. When a heat recovery demand is detected by the controller, the controller is configured to open the bypass flow control device to allow a first portion of working fluid to bypass the condenser or the subcooler.
    Type: Application
    Filed: November 1, 2021
    Publication date: February 17, 2022
    Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom
  • Methods and systems for controlling working fluid in HVACR systems
    Patent number: 11162723
    Abstract: Methods and systems for controlling working fluid flow in a heating, ventilation, air conditioning and refrigeration (HVACR) unit for an HVACR system are disclosed. The unit includes a compressor having a motor and a drive. The unit also includes a condenser fluidly connected to the compressor. A subcooler is located downstream of the condenser. The unit further includes an evaporator fluidly connected to the condenser. Also the unit includes a controller. The unit also includes a bypass assembly connected to the condenser. The bypass assembly includes a bypass flow control device and a bypass fluid line controlled by the bypass flow control device. When a heat recovery demand is detected by the controller, the controller is configured to open the bypass flow control device to allow a first portion of working fluid to bypass the condenser or the subcooler.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: November 2, 2021
    Assignee: TRANE INTERNATIONAL INC.
    Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom
  • METHODS AND SYSTEMS FOR CONTROLLING WORKING FLUID IN HVACR SYSTEMS
    Publication number: 20200309433
    Abstract: Methods and systems for controlling working fluid flow in a heating, ventilation, air conditioning and refrigeration (HVACR) unit for an HVACR system are disclosed. The unit includes a compressor having a motor and a drive. The unit also includes a condenser fluidly connected to the compressor. A subcooler is located downstream of the condenser. The unit further includes an evaporator fluidly connected to the condenser. Also the unit includes a controller. The unit also includes a bypass assembly connected to the condenser. The bypass assembly includes a bypass flow control device and a bypass fluid line controlled by the bypass flow control device. When a heat recovery demand is detected by the controller, the controller is configured to open the bypass flow control device to allow a first portion of working fluid to bypass the condenser or the subcooler.
    Type: Application
    Filed: March 29, 2019
    Publication date: October 1, 2020
    Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom