Patents by Inventor Ram Ranjan
Ram Ranjan 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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Publication number: 20210372706Abstract: A heat exchanger includes a heat exchanger body having a first end and a second end opposed to the first end along a flow axis. A plurality of flow channels is defined in the heat exchanger body extending axially with respect to the flow axis. A first set of the flow channels forms a first flow circuit and a second set of the flow channels forms a second flow circuit that is in fluid isolation from the first flow circuit. Each flow channel is fluidly isolated from the other flow channels. The flow channels all conform to a curvilinear profile.Type: ApplicationFiled: August 12, 2021Publication date: December 2, 2021Applicant: Hamilton Sundstrand CorporationInventors: Joseph Turney, Ram Ranjan, Thomas M. Yun, Matthew Robert Pearson
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Patent number: 11187148Abstract: A system includes a power cycle and a cooling cycle. The power cycle includes a first compressor, a recuperative heat exchanger, a waste-heat heat exchanger, and a turbine. The turbine includes a drive shaft coupled to the first compressor. The working fluid from the waste-heat heat exchanger drives the turbine, the drive shaft, and the first compressor. The recuperative heat exchanger cools the working fluid from the turbine, and at least one ram-air heat exchanger further cools the working fluid from the recuperative heat exchanger. The first compressor is configured to pressurize the working fluid from the at least one ram-air heat exchanger. The cooling cycle includes a pump, an isenthalpic valve, an ambient air heat exchanger, and a second compressor. The cooling cycle cools the working fluid and ambient air and is connected to the power cycle in the at least one ram-air heat exchanger.Type: GrantFiled: July 31, 2020Date of Patent: November 30, 2021Assignee: HAMILTON SUNDSTRAND CORPORATIONInventors: Malcolm MacDonald, Ram Ranjan, Brian M. Holley
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Publication number: 20210340884Abstract: A hybrid powerplant can include a fuel cell cycle system configured to generate a first power using a fuel and an oxidizer. The powerplant can also include a supercritical carbon dioxide (sCO2) cycle system operatively connected to the fuel cell cycle to receive heat from the fuel cell cycle to cause the sCO2 cycle system to generate a second power.Type: ApplicationFiled: May 4, 2021Publication date: November 4, 2021Applicant: Hamilton Sundstrand CorporationInventors: Malcolm Macdonald, Ram Ranjan
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Publication number: 20210340878Abstract: A turbo-generator is provided including a housing, a plurality of turbine impellers arranged within the housing, a shaft extending between and coupling the plurality of turbine impellers; and a generator mounted within the housing between the plurality of turbine impellers. The generator includes a stator having a stator core including a plurality of windings and a rotor. The rotor is rotationally coupled to the shaft. A cooling system includes at least one cooling passage integrated into the stator core of the generator.Type: ApplicationFiled: April 29, 2021Publication date: November 4, 2021Inventors: Malcolm MacDonald, Ram Ranjan
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Patent number: 11112183Abstract: A heat exchanger includes a heat exchanger body having a first end and a second end opposed to the first end along a flow axis. A plurality of flow channels is defined in the heat exchanger body extending axially with respect to the flow axis. A first set of the flow channels forms a first flow circuit and a second set of the flow channels forms a second flow circuit that is in fluid isolation from the first flow circuit. Each flow channel is fluidly isolated from the other flow channels. The flow channels all conform to a curvilinear profile.Type: GrantFiled: January 14, 2016Date of Patent: September 7, 2021Assignee: Hamilton Sundstrand CorporationInventors: Joseph Turney, Ram Ranjan, Thomas M. Yun, Matthew R. Pearson
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Publication number: 20210254899Abstract: An oscillating heat pipe device can include a body formed to be at least partially flexible, one or more channels within the body and defined by the body, an evaporator portion within the body at a first end of the one or more channels and in fluid communication with the one or more channels, and a condenser portion within the body at a second end of the one or more channels and in fluid communication with the one or more channels. The body can be configured to flex between the evaporator portion and the condenser portion. The device can include a heat transfer fluid trapped within the channels to transfer heat between the evaporator portion and the condenser portion.Type: ApplicationFiled: February 14, 2020Publication date: August 19, 2021Applicant: Hamilton Sundstrand CorporationInventors: Abbas A. Alahyari, Jinliang Wang, Ram Ranjan
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Patent number: 11085700Abstract: A heat exchanger includes an external casing and a core. The external casing includes a first inlet, a first outlet, a second inlet, and a second outlet. The core includes an array of branched channels connecting the first inlet and first outlet, an inlet header, and an outlet header. The inlet header is integrally formed with and fluidly connected to the first inlet. The outlet header is integrally formed with and fluidly connected to the first outlet. The branched channels and the external casing define a fluidic passage. The array of branched channels includes a first split, a first juncture, a secondary split, a secondary juncture, and a subset of splits and junctures. The first split and first juncture are common to an entirety of the array of branched channels. The subset of splits and junctures route fluid through interconnections between fluidly parallel branched channels.Type: GrantFiled: November 5, 2018Date of Patent: August 10, 2021Assignee: Hamilton Sundstrand CorporationInventor: Ram Ranjan
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Publication number: 20210218297Abstract: A stator of an electric motor includes a stator core including a rim and a plurality of stator teeth extending from the rim. The plurality of stator teeth define a plurality of tooth gaps between circumferentially adjacent stator teeth. A plurality of stator windings are wrapped along the plurality of stator teeth. The plurality of stator windings include a plurality of core segments extending along the plurality of tooth gaps, and a plurality of end turn segments connecting adjacent core segments. A plurality of non-electrically conductive cooling channels are located in the stator core. The plurality of cooling channels are configured to direct a cooling fluid flow therethrough to cool the plurality of stator windings.Type: ApplicationFiled: January 14, 2020Publication date: July 15, 2021Inventors: Kimberly Rae Saviers, Ram Ranjan, Jagadeesh Kumar Tangudu
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Publication number: 20210213571Abstract: A method of fabricating an oscillating heat pipe includes building the oscillating heat pipe with a layer-by-layer additive manufacturing process such that the oscillating heat pipe includes a body of solid material, an array of channels, an evaporator portion, and a condenser portion. The array of channels are disposed in the body and define a continuous loop through which a fluid flows. The array of channels is formed by cavities in the body as the body is formed with layer-by-layer additive manufacturing. An inner surface of a channel includes a flow directing feature that is configured to promote a first direction of flow and that is configured to provide resistance against a second direction of flow that is opposite the first direction of flow.Type: ApplicationFiled: March 29, 2021Publication date: July 15, 2021Inventors: Abbas A. Alahyari, Ram Ranjan, Jinliang Wang
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Patent number: 11045912Abstract: A method of fabricating an oscillating heat pipe includes building the oscillating heat pipe with a layer-by-layer additive manufacturing process such that the oscillating heat pipe includes a body of solid material, an array of channels, an evaporator portion, and a condenser portion. The array of channels are disposed in the body and define a continuous loop through which a fluid flows. The array of channels is formed by cavities in the body as the body is formed with layer-by-layer additive manufacturing. An inner surface of a channel includes a flow directing feature that is configured to promote a first direction of flow and that is configured to provide resistance against a second direction of flow that is opposite the first direction of flow.Type: GrantFiled: June 18, 2019Date of Patent: June 29, 2021Assignee: Hamilton Sundstrand CorporationInventors: Abbas A. Alahyari, Ram Ranjan, Jinliang Wang
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Patent number: 11001477Abstract: An elevator system includes an elevator car constructed and arranged to travel in a hoistway. A linear propulsion system of the elevator system is configured to impart a force upon the elevator car to control movement of the car. The linear propulsion system includes a secondary portion mounted to the elevator car and having a plurality of magnets. A first primary portion of the linear propulsion system includes a mounting assembly, a plurality of coils engaged to the mounting assembly, and a first cooling device including at least one conduit projecting outward from the mounting assembly and into the hoistway for transferring heat.Type: GrantFiled: August 5, 2016Date of Patent: May 11, 2021Assignee: OTIS ELEVATOR COMPANYInventors: Ram Ranjan, Enrico Manes, Bryan Robert Siewert, Zbigniew Piech
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Patent number: 10995997Abstract: A counterflow heat exchanger configured to exchange thermal energy between a first fluid flow at a first pressure and a second fluid flow at a second pressure less than the first pressure includes a first fluid inlet, a first fluid outlet fluidly coupled to the first fluid inlet via a core section, a second fluid inlet, and a second fluid outlet fluidly coupled to the second fluid inlet via the core section. A heating arrangement is configured to heat the second fluid inlet to prevent ice ingestion via the second fluid inlet.Type: GrantFiled: June 26, 2018Date of Patent: May 4, 2021Assignee: HAMILTON SUNSTRAND CORPORATIONInventors: Brian St. Rock, Ram Ranjan
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Publication number: 20210055143Abstract: An air data probe includes an air data probe body and an additively manufactured heater on the air data probe body, the heater including a first heater layer and a first dielectric layer on the first heater layer. The first dielectric layer makes up an exterior surface of the heater.Type: ApplicationFiled: August 20, 2019Publication date: February 25, 2021Inventors: Scott Wigen, Greg Allen Seidel, Ram Ranjan, Timothy Thomas Golly
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Publication number: 20210033355Abstract: A header duct and method of forming a header duct includes an inlet portion having a planar inlet, an outlet portion have a plurality of planar outlets, and a transition portion extending continuously from the inlet portion to the outlet portion. The transition portion has a bend and internal topography defining a non-monotonic cross-sectional area distribution between the inlet and outlet portions. The transition portion can further include a bulbous region extending in a lateral direction of the duct and a protrusion located along an inside radius of the bend.Type: ApplicationFiled: October 21, 2020Publication date: February 4, 2021Inventors: Ram Ranjan, Brian St. Rock
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Publication number: 20200398385Abstract: A method of fabricating an oscillating heat pipe includes building the oscillating heat pipe with a layer-by-layer additive manufacturing process such that the oscillating heat pipe includes a body of solid material, an array of channels, an evaporator portion, and a condenser portion. The array of channels are disposed in the body and define a continuous loop through which a fluid flows. The array of channels is formed by cavities in the body as the body is formed with layer-by-layer additive manufacturing. An inner surface of a channel includes a flow directing feature that is configured to promote a first direction of flow and that is configured to provide resistance against a second direction of flow that is opposite the first direction of flow.Type: ApplicationFiled: June 18, 2019Publication date: December 24, 2020Inventors: Abbas A. Alahyari, Ram Ranjan, Jinliang Wang
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Patent number: 10845135Abstract: A header duct and method of forming a header duct includes an inlet portion having a planar inlet, an outlet portion have a plurality of planar outlets, and a transition portion extending continuously from the inlet portion to the outlet portion. The transition portion has a bend and internal topography defining a non-monotonic cross-sectional area distribution between the inlet and outlet portions. The transition portion can further include a bulbous region extending in a lateral direction of the duct and a protrusion located along an inside radius of the bend.Type: GrantFiled: March 16, 2018Date of Patent: November 24, 2020Assignee: Hamilton Sundstrand CorporationInventors: Ram Ranjan, Brian St. Rock
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Patent number: 10646969Abstract: A heat exchanger includes a first additively manufactured layer including axial fins extending in a first direction and transverse fins extending in a second direction transverse to the first direction, the first layer defining a flow path in the first direction. The heat exchanger also includes a second additively manufactured layer including axial fins extending in the second and transverse fins extending in the first direction, the second layer defining a second flow path in the second direction.Type: GrantFiled: December 2, 2015Date of Patent: May 12, 2020Assignee: HAMILTON SUNSTRAND CORPORATIONInventor: Ram Ranjan
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Publication number: 20200141654Abstract: A heat exchanger includes an external casing and a core. The external casing includes a first inlet, a first outlet, a second inlet, and a second outlet. The core includes an array of branched channels connecting the first inlet and first outlet, an inlet header, and an outlet header. The inlet header is integrally formed with and fluidly connected to the first inlet. The outlet header is integrally formed with and fluidly connected to the first outlet. The branched channels and the external casing define a fluidic passage. The array of branched channels includes a first split, a first juncture, a secondary split, a secondary juncture, and a subset of splits and junctures. The first split and first juncture are common to an entirety of the array of branched channels. The subset of splits and junctures route fluid through interconnections between fluidly parallel branched channels.Type: ApplicationFiled: November 5, 2018Publication date: May 7, 2020Inventor: Ram Ranjan
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Patent number: 10640332Abstract: An elevator system includes an elevator car constructed and arranged to travel in a hoistway. A linear propulsion system of the elevator system is configured to impart a force upon the elevator car to control movement of the car. The linear propulsion system includes a secondary portion mounted to the elevator car and may have a plurality of magnets. A first primary portion (42) of the linear propulsion system includes a mounting assembly (60), a plurality of coils engaged to the mounting assembly (60), and a first cooling device (80) including at least one conduit (82) projecting outward from the mounting assembly (60) and into the hoistway for transferring heat.Type: GrantFiled: August 5, 2016Date of Patent: May 5, 2020Assignee: OTIS ELEVATOR COMPANYInventors: Ram Ranjan, Enrico Manes
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Publication number: 20190390915Abstract: A counterflow heat exchanger configured to exchange thermal energy between a first fluid flow at a first pressure and a second fluid flow at a second pressure less than the first pressure includes a first fluid inlet, a first fluid outlet fluidly coupled to the first fluid inlet via a core section, a second fluid inlet, and a second fluid outlet fluidly coupled to the second fluid inlet via the core section. A heating arrangement is configured to heat the second fluid inlet to prevent ice ingestion via the second fluid inlet.Type: ApplicationFiled: June 26, 2018Publication date: December 26, 2019Inventors: Brian St. Rock, Ram Ranjan