Patents by Inventor Greg Haggy
Greg Haggy 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: 9980413Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.Type: GrantFiled: April 22, 2015Date of Patent: May 22, 2018Assignee: Liebert CorporationInventors: John F. Judge, Timothy J. Schrader, Stephen Sillato, Roger Noll, Gary A. Helmink, Pierpaolo Barbato, Giuseppe Dalla Mana, Lou Monnier, Zhiyong Lin, Benedict J. Dolcich, Daniel J. Schutte, Greg Haggy
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Load estimator for control of vapor compression cooling system with pumped refrigerant economization
Patent number: 9845981Abstract: A cooling system has a direct expansion mode and a pumped refrigerant economizer mode and a controller. The controller includes a load estimator that estimates real-time indoor load on the cooling system and uses the estimated real-time indoor load to determine whether to operate the cooling system in the pumped refrigerant economizer mode or in the direct expansion mode.Type: GrantFiled: October 4, 2013Date of Patent: December 19, 2017Assignee: Liebert CorporationInventors: Zongtao Lu, Greg Haggy, Timothy J. Schrader, Stephen Sillato, John F. Judge -
Publication number: 20160061495Abstract: A cooling system has a cooling circuit that includes an evaporator disposed in a cabinet, a condenser, a compressor, a liquid/vapor separator tank and a liquid pump. The cooling circuit has a mode wherein the compressor and liquid pump are both on with the liquid pump pumping refrigerant through the evaporator with the refrigerant leaving the evaporator circulated to an inlet of the liquid/vapor separator tank and not to an inlet of the condenser. The cooling circuit also has a pumped refrigerant economizer mode wherein the liquid pump is on and the compressor is off and bypassed with the refrigerant leaving the evaporator circulated to the inlet of the condenser and not to the inlet of the liquid/vapor separator tank.Type: ApplicationFiled: October 9, 2015Publication date: March 3, 2016Applicant: LIEBERT CORPORATIONInventors: Stephen Sillato, Timothy J. Schrader, Greg Haggy, Thomas Harvey, Zongtao Lu, John F. Judge
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Patent number: 9140475Abstract: A cooling system includes a cooling circuit having an evaporator, a condenser, a compressor, an expansion device, a liquid pump, and a receiver/surge tank coupled between the condenser and the liquid pump. The cooling system has a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system switches from the direct expansion mode to the pumped refrigerant economizer mode, refrigerant is flushed from the refrigerant/surge tank so that the cooling circuit is overcharged when it begins operating in the pumped refrigerant economizer mode.Type: GrantFiled: November 13, 2013Date of Patent: September 22, 2015Assignee: Liebert CorporationInventors: Timothy J. Schrader, Greg Haggy, Stephen Sillato
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Publication number: 20150230367Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.Type: ApplicationFiled: April 22, 2015Publication date: August 13, 2015Applicant: Liebert CorporationInventors: John F. JUDGE, Timothy J. SCHRADER, Stephen SILLATO, Roger NOLL, Gary A. HELMINK, Pierpaolo BARBATO, Giuseppe Dalla MANA, Lou MONNIER, Zhiyong LIN, Benedict J. DOLCICH, Daniel J. SCHUTTE, Greg HAGGY
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Patent number: 9038404Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.Type: GrantFiled: April 13, 2012Date of Patent: May 26, 2015Assignee: Liebert CorporationInventors: John F. Judge, Timothy J. Schrader, Stephen Sillato, Roger Noll, Gary A. Helmink, Pierpaolo Barbato, Giuseppe Dalla Mana, Lou Monnier, Zhiyong Lin, Benedict J. Dolcich, Daniel J. Schutte, Greg Haggy, Thomas Harvey, Zongtao Lu
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Publication number: 20140157821Abstract: A cooling system includes a cooling circuit having an evaporator, a condenser, a compressor, an expansion device, a liquid pump, and a receiver/surge tank coupled between the condenser and the liquid pump. The cooling system has a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system switches from the direct expansion mode to the pumped refrigerant economizer mode, refrigerant is flushed from the refrigerant/surge tank so that the cooling circuit is overcharged when it begins operating in the pumped refrigerant economizer mode.Type: ApplicationFiled: November 13, 2013Publication date: June 12, 2014Inventors: Timothy J. SCHRADER, Greg HAGGY, Stephen SILLATO
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Load Estimator For Control Of Vapor Compression Cooling System With Pumped Refrigerant Economization
Publication number: 20140033753Abstract: A cooling system has a direct expansion mode and a pumped refrigerant economizer mode and a controller. The controller includes a load estimator that estimates real-time indoor load on the cooling system and uses the estimated real-time indoor load to determine whether to operate the cooling system in the pumped refrigerant economizer mode or in the direct expansion mode.Type: ApplicationFiled: October 4, 2013Publication date: February 6, 2014Inventors: Zongtao LU, Greg HAGGY, Timothy J. SCHRADER, Stephen SILLATO, John F. JUDGE -
Publication number: 20130098086Abstract: A cooling system has a cooling circuit that includes an evaporator disposed in a cabinet, a condenser, a compressor, an electronic expansion valve and a liquid pump. a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system is in the pumped refrigerant economizer mode, the controller controls a temperature of the refrigerant to a refrigerant temperature set point by regulating a speed of a fan of the condenser, controls a temperature of air in a room in which the cabinet is disposed to a room air temperature setpoint by regulating a speed of the liquid pump, and maintains a pressure differential across the liquid pump within a given range by regulating an open position of an electronic expansion valve.Type: ApplicationFiled: April 13, 2012Publication date: April 25, 2013Applicant: Liebert CorporationInventors: Stephen Sillato, Timothy J. Schrader, Greg Haggy, Thomas Harvey, Zongtao Lu, John F. Judge
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Publication number: 20130098085Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.Type: ApplicationFiled: April 13, 2012Publication date: April 25, 2013Applicant: Liebert CorporationInventors: John F. Judge, Timothy J. Schrader, Stephen Sillato, Roger Noll, Gary A. Helmink, Pierpaolo Barbato, Giuseppe Dalla Mana, Lou Monnier, Zhiyong Lin, Benedict J. Dolcich, Daniel J. Schutte, Greg Haggy, Thomas Harvey, Zongtao Lu