Patents by Inventor David Andrew Bradshaw

David Andrew Bradshaw 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).

  • Patent number: 11942851
    Abstract: A system for cooling a hermetic motor includes a motor cooling refrigerant flow path configured to direct refrigerant from a condenser disposed along a refrigerant loop to a hermetic motor, and from the hermetic motor back to the refrigerant loop, and a housing of the hermetic motor disposed along the motor cooling refrigerant flow path and configured to receive the refrigerant from the condenser, wherein the housing of the hermetic motor comprises an annulus surrounding at least a portion of a stator of the hermetic motor, and wherein the annulus comprises a plurality of openings configured to direct refrigerant toward the stator and into a cavity of the housing of the hermetic motor.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: March 26, 2024
    Assignee: Tyco Fire & Security GMBH
    Inventors: Katelynn Louise Crissman, Ian Michael Casper, David Andrew Bradshaw, Matthew Lee Heisey, Tyler Alexander Wolgemuth, Paul William Snell
  • Publication number: 20230358448
    Abstract: A heating, ventilation, and/or air conditioning (HVAC) system includes a vessel configured to receive refrigerant from a condenser of the HVAC system, an evaporator configured to receive the refrigerant from the vessel, a first conduit configured to direct a first flow of the refrigerant to a first inlet of the evaporator, and a second conduit configured to direct a second flow of the refrigerant to a second inlet of the evaporator. The second inlet is above the first inlet relative to a vertical axis.
    Type: Application
    Filed: September 30, 2021
    Publication date: November 9, 2023
    Inventors: David Andrew Bradshaw, Cameron Stuart Nelson, Jeb William Schreiber, Seth Kevin Gladfelter
  • Publication number: 20230228467
    Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that improve efficiency by selectively activating and deactivating the purge unit in response to one or more conditions to, for example, enable refrigerant-to-air ratios within the purge unit within certain industry standards while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof.
    Type: Application
    Filed: March 23, 2023
    Publication date: July 20, 2023
    Inventors: David Andrew Bradshaw, Andrew Michael Welch, Curtis C. Crane, Calvin Andrew Nelson
  • Patent number: 11635238
    Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that improve efficiency by selectively activating and deactivating the purge unit in response to one or more conditions to, for example, enable refrigerant-to-air ratios within the purge unit within certain industry standards while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof. By reducing an amount of time that the purge unit would be active without removing a substantial amount non-condensables from the vapor compression system, present embodiments reduce the power consumption of the purge unit, as well as the vapor compression system as a whole.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: April 25, 2023
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: David Andrew Bradshaw, Andrew Michael Welch, Curtis C. Crane, Calvin Andrew Nelson
  • Patent number: 11466912
    Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that selectively activate and deactivate the purge unit in response to one or more conditions to, for example, control refrigerant-to-air ratios while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof. By reducing an amount of time that the purge unit would be active without removing a substantial amount non-condensables from the vapor compression system, present embodiments reduce the power consumption of the purge unit, as well as the vapor compression system as a whole, while still being responsive to prevent or mitigate a loss of efficiency due to a substantial accumulation of non-condensables in the condenser of the vapor compression system.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: October 11, 2022
    Assignee: Johnson Controls TYCO IP Holdings LLP
    Inventors: David Andrew Bradshaw, Andrew Michael Welch, Curtis C. Crane, Calvin Andrew Nelson
  • Publication number: 20200355413
    Abstract: Embodiments of the present disclosure relate to a heating, ventilation, air conditioning, and refrigeration (HVAC&R) system including a refrigerant loop and a purge system configured to purge the HVAC&R system of non-condensable gases. The purge system includes a liquid pump configured to draw a first refrigerant flow from an evaporator, a controllable expansion valve configured to receive the first refrigerant flow from the liquid pump and reduce a temperature of the first refrigerant flow, and a purge heat exchanger, which includes a purge coil. The purge coil is configured to receive the first refrigerant flow from the controllable expansion valve, a chamber of the purge heat exchanger is configured to draw a mixture of the non-condensable gases and a second refrigerant flow from a condenser, and the purge heat exchanger is configured to separate the non-condensable gases from the second refrigerant flow utilizing the first refrigerant flow.
    Type: Application
    Filed: August 23, 2018
    Publication date: November 12, 2020
    Inventors: Maccrae William Monteith, Jay Albert Kohler, David Andrew Bradshaw, Andrew Michael Welch
  • Publication number: 20200240690
    Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that improve efficiency by selectively activating and deactivating the purge unit in response to one or more conditions to, for example, enable refrigerant-to-air ratios within the purge unit within certain industry standards while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof.
    Type: Application
    Filed: October 4, 2018
    Publication date: July 30, 2020
    Inventors: David Andrew Bradshaw, Andrew Michael Welch, Curtis C. Crane, Calvin Andrew Nelson
  • Publication number: 20200240685
    Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that improve efficiency by selectively activating and deactivating the purge unit in response to one or more conditions to, for example, enable refrigerant-to-air ratios within the purge unit within certain industry standards while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof.
    Type: Application
    Filed: October 4, 2018
    Publication date: July 30, 2020
    Inventors: David Andrew Bradshaw, Andrew Michael Welch, Curtis C. Crane, Calvin Andrew Nelson
  • Publication number: 20200240677
    Abstract: A system for cooling a hermetic motor includes a motor cooling refrigerant flow path configured to direct refrigerant from a condenser disposed along a refrigerant loop to a hermetic motor, and from the hermetic motor back to the refrigerant loop, and a housing of the hermetic motor disposed along the motor cooling refrigerant flow path and configured to receive the refrigerant from the condenser, wherein the housing of the hermetic motor comprises an annulus surrounding at least a portion of a stator of the hermetic motor, and wherein the annulus comprises a plurality of openings configured to direct refrigerant toward the stator and into a cavity of the housing of the hermetic motor.
    Type: Application
    Filed: October 10, 2018
    Publication date: July 30, 2020
    Inventors: Katelynn Louise Crissman, Ian Michael Casper, David Andrew Bradshaw, Matthew Lee Heisey, Tyler Alexander Wolgemuth, Paul William Snell