Zhiyong Lin

US Patent:

20130098085, Apr 25, 2013

Filed:

Apr 13, 2012

Appl. No.:

13/446374

Inventors:

John F. Judge - Galena OH, US
Timothy J. Schrader - Irwin OH, US
Stephen Sillato - Westerville OH, US
Roger Noll - Gahanna MI, US
Gary A. Helmink - Galloway OH, US
Pierpaolo Barbato - Noventa Padovana, IT
Giuseppe Dalla Mana - Vigonza, IT
Lou Monnier - Westerville OH, US
Zhiyong Lin - Columbus OH, US
Benedict J. Dolcich - Westerville OH, US
Daniel J. Schutte - Lewis Center OH, US
Greg Haggy - Pickerington OH, US
Thomas Harvey - Columbus OH, US
Zongtao Lu - Pittsburgh PA, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F25B 49/02
F25B 41/04
F25D 17/06

US Classification:

62180, 62190, 62186, 622281, 62222

Abstract:

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.

US Patent:

20130098088, Apr 25, 2013

Filed:

Apr 13, 2012

Appl. No.:

13/446344

Inventors:

Zhiyong Lin - Columbus OH, US
Roger Noll - Gahanna MI, US
John F. Judge - Galena OH, US
Gary A. Helmink - Galloway OH, US
Benedict J. Dolcich - Westerville OH, US
Daniel J. Schutte - Lewis Center OH, US
Timothy J. Schrader - Irwin OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F25B 49/02

US Classification:

622281

Abstract:

A cooling system has a plurality of separate cooling stages including an upstream cooling stage having an upstream cooling circuit and a downstream cooling stage including a downstream cooling circuit, which are each a direct expansion cooling circuit including a tandem compressor. Each tandem compressor includes a fixed capacity compressor and a variable capacity compressor. A controller controls the fixed capacity compressor and variable capacity compressor of each tandem compressor based on a Call for Cooling, which of a plurality of ranges the Call for Cooling falls within, and whether the Call for Cooling is ramping up or ramping down.

US Patent:

20190178548, Jun 13, 2019

Filed:

Nov 12, 2018

Appl. No.:

16/186648

Inventors:

- Columbus OH, US
Zhiyong LIN - Dublin OH, US

International Classification:

F25B 49/02

Abstract:

A cooling system is provided and includes pump, condenser fan, and control modules. The pump module controls a pump to pump a cooling fluid through a cooling circuit. The condenser fan module controls a condenser fan to transfer air across a condenser of the cooling circuit. The control module, while operating in a pumped refrigerant economizer mode or a mixed mode, determines a requested CFC percentage. The pump module activates the pump if the requested CFC percentage is greater than or equal to a predetermined CFC percentage. The condenser fan module: if the requested CFC percentage is greater than or equal to the predetermined CFC percentage, activates the condenser fan or operates the condenser fan at least at a minimum speed; and based on the requested CFC percentage, adjusts a speed of the condenser fan between the minimum speed and a maximum permitted speed to provide the requested CFC percentage.

US Patent:

20170227259, Aug 10, 2017

Filed:

Jan 11, 2017

Appl. No.:

15/403792

Inventors:

- Columbus OH, US
Zhiyong LIN - Dublin OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F25B 6/02
F24F 11/00
F24F 13/10
F25B 41/04
F24F 3/044

Abstract:

A hybrid air handler cooling unit has a bi-modal heat exchanger. In a direct expansion mode or a pumped refrigerant economization mode, the bi-modal heat exchanger is in a refrigerant path in parallel with first and second condenser coils and functions as a condenser coil. In a mixed direct expansion/pumped refrigerant economization mode, the bi-modal heat exchanger is in a refrigerant path in series between an outlet of a pump and an inlet of the first condenser coil and functions as a pre-cooler evaporator coil with return air first flowing across the bi-modal heat exchanger and then across an evaporator coil of an evaporator.

US Patent:

20160084539, Mar 24, 2016

Filed:

Sep 16, 2015

Appl. No.:

14/855486

Inventors:

- Columbus OH, US
Matthew RAVEN - Columbus OH, US
Benedict J. DOLCICH - Westerville OH, US
Zhiyong LIN - Dublin OH, US

Assignee:

LIEBERT CORPORATION - Columbus OH

International Classification:

F25B 13/00

Abstract:

In an aspect, a cooling system has a cooling circuit that includes an evaporator, a condenser, a compressor, a sub-cooler and an expansion device configured in a direct expansion cooling circuit with the sub-cooler coupled in series between an outlet of the condenser and an inlet of the expansion device. The condenser has a micro-channel cooling coil and the sub-cooler has a fin-and-tube cooling coil. In an aspect, the fin-and-tube cooling coil of the sub-cooler has a total hydraulic volume equivalent to the total hydraulic volume of the micro-channel cooling coil of the condenser but the fin-and-tube cooling coil of the sub-cooler has a face area more than two times smaller than a face area of the micro-channel cooling coil of the condenser.

US Patent:

20150230367, Aug 13, 2015

Filed:

Apr 22, 2015

Appl. No.:

14/693478

Inventors:

- Columbus OH, US
Timothy J. SCHRADER - Irwin OH, US
Stephen SILLATO - Westerville OH, US
Roger NOLL - Gahanna OH, US
Gary A. HELMINK - Galloway OH, US
Pierpaolo BARBATO - Noventa Padovana, IT
Giuseppe Dalla MANA - Vigonza, IT
Lou MONNIER - West Chester OH, US
Zhiyong LIN - Dublin OH, US
Benedict J. DOLCICH - Westerville OH, US
Daniel J. SCHUTTE - Lewis Center OH, US
Greg HAGGY - Pickerington OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H05K 7/20
F25B 49/02
F25D 17/06
F25B 41/04

Abstract:

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.

US Patent:

20140230466, Aug 21, 2014

Filed:

Jan 31, 2014

Appl. No.:

14/169183

Inventors:

- Columbus OH, US
Lou MONNIER - Westerville OH, US
Zhiyong LIN - Dublin OH, US
Daniel J. SCHUTTE - Lewis Center OH, US
Benedict J. DOLCICH - Westerville OH, US

International Classification:

F25B 49/02

US Classification:

62 89, 62 56, 62126

Abstract:

A method including: determining a cooling value; and comparing the cooling value to an activation point of a lead compressor. The lead compressor is in a tandem set of scroll compressors of a cooling system. The tandem set of compressors comprises a lag compressor. The method further includes: activating the lead compressor when the cooling value is greater than the activation point; activating the lag compressor subsequent to activating the lead compressor; and determining whether conditions exist including: an alarm associated with the lag compressor being generated, and the lead compressor being deactivated. The method further includes deactivating the lag compressor when at least one of the conditions exists in the cooling system.

US Patent:

20140230467, Aug 21, 2014

Filed:

Jan 31, 2014

Appl. No.:

14/169185

Inventors:

- Columbus OH, US
Lou MONNIER - Westerville OH, US
Gary A. HELMINK - Galloway OH, US
Zhiyong LIN - Dublin OH, US
Daniel J. SCHUTTE - Lewis Center OH, US
Benedict J. DOLCICH - Westerville OH, US

International Classification:

F25B 49/02

US Classification:

62 89, 62 56, 62186, 62180, 62126

Abstract:

A method including determining whether an OFF criterion is satisfied for a lag compressor of a tandem set of scroll compressors. The tandem set of scroll compressors includes a lead compressor. The method further includes: initiating at least one process when the OFF criterion is satisfied; and maintaining the lag compressor in an ON state for a predetermined period subsequent to the OFF criterion being satisfied. The at least one process includes at least one of: operating the lead compressor at a maximum level; overriding a motor overload protection method, wherein the motor overload protection method protects motors of the lead compressor and the lag compressor; and overriding a proportional integral derivative (PID) method to reduce a speed of a condenser fan. The PID method controls the speed of the condenser fan.