Patents by Inventor Daoud A. Jandal
Daoud A. Jandal 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).
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Patent number: 11635265Abstract: A bolted hinge assembly is provided for a waterbox cover (a “waterbox hinge assembly”). The waterbox hinge assembly generally does not require welding on the waterbox cover or the heat exchanger in an HVAC system (“HVAC unit” hereinafter). Further, the waterbox hinge assembly may be installable to the HVAC unit without removing the heat exchange fluids (e.g., water, refrigerant, etc.) from the HVAC unit. In some cases, the waterbox hinge assembly can be installed on an HVAC unit without removing any bolts from the waterbox cover. Once installed, the waterbox hinge assembly can be left in place so that it can be reused anytime the HVAC unit is serviced.Type: GrantFiled: February 4, 2019Date of Patent: April 25, 2023Assignee: TRANE INTERNATIONAL INC.Inventors: Steven E. Wolfgram, Daoud A. Jandal, Bradley S. Wickersham, Fred Eickstaedt, James M. McCool, Raymond S. Schafer, Ronald E. Schlicht, Robert A. Harris, Steven E. Meloling, Raghu Kumar, Kishore Prabakaran
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Publication number: 20220049886Abstract: 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: ApplicationFiled: November 1, 2021Publication date: February 17, 2022Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom
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Patent number: 11162723Abstract: 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: GrantFiled: March 29, 2019Date of Patent: November 2, 2021Assignee: TRANE INTERNATIONAL INC.Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom
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Publication number: 20200309433Abstract: 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: ApplicationFiled: March 29, 2019Publication date: October 1, 2020Inventors: Jun Wang, Yves Jacques Raimbault, Daoud A. Jandal, Todd J. Love, Kevin D. Pfaff, Fred Ahlstrom
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Patent number: 10480834Abstract: Apparatuses, systems, and methods are disclosed to prime a refrigerant pump by decoupling the condenser from the refrigerant pump and the refrigerant pump line or shielding from a condenser operation prior to startup of the system, so that liquid refrigerant can be appropriately sourced from the condenser and/or the evaporator using flow control device(s) such as a source valve on a source line of the condenser and/or on a source line of the evaporator and the control of such valve(s).Type: GrantFiled: December 12, 2016Date of Patent: November 19, 2019Assignee: TRANE INTERNATIONAL INC.Inventors: Daoud A. Jandal, Brian Thomas Sullivan, Reginald Loyd Berry, Dennis Lee Justin, Matthew Aron Witt, Damion Scott Plymesser
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Publication number: 20190170454Abstract: Embodiments described in this specification are generally directed to a bolted hinge assembly for a waterbox cover (a “waterbox hinge assembly”). The waterbox hinge assembly generally does not require welding on the waterbox cover or the heat exchanger in an HVAC system (“HVAC unit” hereinafter). Further, the waterbox hinge assembly may be installable to the HVAC unit without removing the heat exchange fluids (e.g., water, refrigerant, etc.) from the HVAC unit. In some embodiments, the waterbox hinge assembly can be installed on an HVAC unit without removing any bolts from the waterbox cover. Once installed, the waterbox hinge assembly can be left in place so that it can be reused anytime the HVAC unit is serviced.Type: ApplicationFiled: February 4, 2019Publication date: June 6, 2019Inventors: Steven E. Wolfgram, Daoud A. Jandal, Bradley S. Wickersham, Fred Eickstaedt, James M. McCool, Raymond S. Schafer, Ronald E. Schlicht, Robert A. Harris, Steven E. Meloling, Raghu Kumar, Kishore Prabakaran
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Patent number: 10203168Abstract: Embodiments described in this specification are generally directed to a bolted hinge assembly for a waterbox cover (a “waterbox hinge assembly”). The waterbox hinge assembly generally does not require welding on the waterbox cover or the heat exchanger in an HVAC system (“HVAC unit” hereinafter). Further, the waterbox hinge assembly may be installable to the HVAC unit without removing the heat exchange fluids (e.g., water, refrigerant, etc.) from the HVAC unit. In some embodiments, the waterbox hinge assembly can be installed on an HVAC unit without removing any bolts from the waterbox cover. Once installed, the waterbox hinge assembly can be left in place so that it can be reused anytime the HVAC unit is serviced.Type: GrantFiled: June 15, 2016Date of Patent: February 12, 2019Assignee: TRANE INTERNATIONAL INC.Inventors: Steven E. Wolfgram, Daoud A. Jandal, Bradley S. Wickersham, Fred Eickstaedt, James M. McCool, Raymond S. Schafer, Ronald E. Schlicht, Robert A. Harris, Steven E. Meloling, Raghu Kumar, Kishore Prabakaran
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Publication number: 20170089620Abstract: Generally, apparatuses, systems, and methods are described to prime a refrigerant pump by decoupling or shielding from a condenser operation, such as for example the condenser water pump, so that liquid refrigerant can be appropriately sourced from the condenser and/or the evaporator using flow control device(s) such as a source valve on a source line of the condenser and/or on a source line of the evaporator and the control of such valve(s).Type: ApplicationFiled: December 12, 2016Publication date: March 30, 2017Inventors: Daoud A. JANDAL, Brian Thomas SULLIVAN, Reginald Loyd BERRY, Dennis Lee JUSTIN, Matthew Aron WITT, Damion Scott PLYMESSER
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Publication number: 20160363393Abstract: Embodiments described in this specification are generally directed to a bolted hinge assembly for a waterbox cover (a “waterbox hinge assembly”). The waterbox hinge assembly generally does not require welding on the waterbox cover or the heat exchanger in an HVAC system (“HVAC unit” hereinafter). Further, the waterbox hinge assembly may be installable to the HVAC unit without removing the heat exchange fluids (e.g., water, refrigerant, etc.) from the HVAC unit. In some embodiments, the waterbox hinge assembly can be installed on an HVAC unit without removing any bolts from the waterbox cover. Once installed, the waterbox hinge assembly can be left in place so that it can be reused anytime the HVAC unit is serviced.Type: ApplicationFiled: June 15, 2016Publication date: December 15, 2016Inventors: Steven E. Wolfgram, Daoud A. Jandal, Bradley S. Wickersham, Fred Eickstaedt, James M. McCool, Raymond S. Schafer, Ronald E. Schlicht, Robert A. Harris, Steven E. Meloling, Raghu Kumar, Kishore Prabakaran
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Patent number: 6318117Abstract: 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.Type: GrantFiled: August 22, 2000Date of Patent: November 20, 2001Assignee: American Standard International Inc.Inventors: Daoud A. Jandal, Lee L. Sibik, Robin R. Lee, Michael P. Morse
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Patent number: 5850848Abstract: A float valve having a pair of valve plugs mounted on a single valve stem employing a flexible or pivoting couple between the float and the valve stem that allows the float to tilt and move laterally with respect to the axis of movement of the valve stem without affecting the alignment of the valve plugs in relation to their respective valve outlets. This flexible couple might also allow for some free movement of the float in the direction of the axis of movement of the valve stem. In one embodiment the valve plugs have ported sealing surfaces that allow gradual starting and stopping of the flow of fluid through the valve outlets.Type: GrantFiled: June 15, 1995Date of Patent: December 22, 1998Assignee: Gas Research InstituteInventors: Daoud A. Jandal, Jeffrey S. Seewald, Ralph C. Mullally, William J. Plzak
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Patent number: 5636526Abstract: A purge apparatus and method are disclosed for automatically purging an absorption cooling system. Noncondensible gas is drawn out of the absorber of the absorption cooling system by an eductor. The eductor entrains the gas in the fluid flow to the high pressure side of the system. The gas is drawn out of the high pressure side by a separate purge refrigeration system. The evaporator of the purge refrigeration system is located in a purge tank that is in free flow communication with the condenser of the absorption cooling system. Refrigerant vapor and intermixed noncondensible gas flow into the purge tank and the refrigerant vapor condenses on the purge refrigeration system evaporator. The condensed absorption refrigerant is returned to the absorption cooling system. The noncondensible gas collects in the purge tank and blankets the evaporator of the purge refrigeration system, causing the temperature of the purge refrigerant to decrease.Type: GrantFiled: September 28, 1995Date of Patent: June 10, 1997Assignee: Gas Research InstituteInventors: William J. Plzak, Daoud A. Jandal, Jeffrey S. Seewald