Peri Kaladevi Sabhapathy

US Patent:

20030127528, Jul 10, 2003

Filed:

Jan 4, 2002

Appl. No.:

10/036056

Inventors:

Peri Sabhapathy - Northville MI, US
Zheng Lou - Plymouth MI, US

International Classification:

B60H001/02

US Classification:

237/01230B

Abstract:

A powertrain thermal management system for a hybrid vehicle having provisions for passenger cabin heating and engine warm up.

US Patent:

20040069546, Apr 15, 2004

Filed:

Oct 15, 2002

Appl. No.:

10/271420

Inventors:

Zheng Lou - Plymouth MI, US
Peri Sabhapathy - Northville MI, US

International Classification:

B60K011/00

US Classification:

180/065200

Abstract:

The powertrain thermal system of the present invention contains and/or utilizes various sensors and signals. Some are located within the powertrain thermal system itself. However, the majority are located in other systems of the hybrid electrical vehicle. The sensors used by the thermal system include an engine coolant temperature sensor, located at the outlet of the engine water jacket and contained within the existing engine control unit, a transmission fluid temperature sensor, located at the transmission fluid outlet of the liquid-liquid heat exchanger and contained within the transmission control unit, a motor coolant temperature sensor, located between the electric water pump and the inverter cold plate inlet and contained within the powertrain thermal control unit, a stator end-turn temperature sensor, located at the motor stator end-turn and contained within the motor-inverter control unit, a battery temperature sensor, located and contained within the battery control unit, a road speed sensor, contained within the powertrain supervisory control and an ambient temperature sensor, contained within the electronic climate control system. In addition, the present invention comprises a method of providing an optimum thermal environment in a hybrid electrical vehicle, comprising the steps of controlling a motor coolant temperature, controlling a stator end-turn temperature, controlling a transmission fluid temperature, de-rating electric power; and controlling an electric water valve.

US Patent:

20120269625, Oct 25, 2012

Filed:

Apr 19, 2011

Appl. No.:

13/089822

Inventors:

Peri SABHAPATHY - Northville MI, US

International Classification:

F03D 11/00

US Classification:

416 1, 416 95

Abstract:

A system to cool the air inside a nacelle and the heat generating components housed in the nacelle of an offshore wind turbine is presented. An upper cooling circuit is disposed in the nacelle. A reservoir is disposed below the upper cooling circuit and has a lid that freely rotates about a vertical axis of the reservoir along with an inlet and an outlet pipe of the upper cooling circuit as the nacelle yaws, the vertical axis of the reservoir being coincident with a yaw axis of the nacelle. A lower cooling circuit is disposed below the reservoir. Coolant is circulated through the upper cooling circuit using a cooling pump disposed between the nacelle and the upper cooling circuit. The upper cooling circuit carries heat from the heat generating components and from the air inside the nacelle to the reservoir. The lower cooling circuit carries heat from the reservoir to the bottom of the tower and dissipates the heat to the sea water through a heat exchanger that is cooled by the sea water.

US Patent:

20120308383, Dec 6, 2012

Filed:

Jun 3, 2011

Appl. No.:

13/152783

Inventors:

Peri SABHAPATHY - Northville MI, US

International Classification:

F01D 5/08

US Classification:

416 1, 416 96 R

Abstract:

A system and method to cool the air inside the nacelle and the heat generating components, particularly of an offshore wind turbine is presented. The ambient air first enters an air handling unit near the tower bottom where the airborne water droplets and salt particles are removed. The clean air is then compressed adiabatically, thus increasing the dew point temperature of the water vapor in the air. The high pressure, high temperature air from the compressor is then cooled and dehumidified in a sea water-to-air heater exchanger or an air-to-air heat exchanger. The high pressure air from the heat exchanger then enters the turbine at the tower bottom and flows up to the nacelle where it is allowed to expand adiabatically in a duct. The duct helps direct the resulting cold air over the heat generating components. The cold air can also used to cool these components internally. The warm air ultimately exits the nacelle at the rear top.

US Patent:

20130056989, Mar 7, 2013

Filed:

Sep 1, 2011

Appl. No.:

13/223396

Inventors:

Peri SABHAPATHY - Northville MI, US

International Classification:

F03D 9/00
F25B 29/00

US Classification:

290 55, 165 481

Abstract:

An energy efficient climate control system for an offshore wind turbine that is integrated with the component cooling system is disclosed. The climate control system includes a cooling circuit adapted to carry heat generated by a component of the nacelle to outside the nacelle. The climate control system also includes an airflow system adapted to receive a warm outflow of coolant from the cooling circuit, across a variable flow control valve, the airflow system supplying clean ambient air to the nacelle at a predetermined relative humidity. The variable flow control valve regulates a flow rate of the coolant through the airflow system to adjust the relative humidity of the air entering the nacelle.

US Patent:

20130071236, Mar 21, 2013

Filed:

Sep 21, 2011

Appl. No.:

13/238042

Inventors:

Peri SABHAPATHY - Northville MI, US

International Classification:

F01D 5/08

US Classification:

415180

Abstract:

A system to cool the air inside a nacelle of a wind turbine including the heat generating components such as the drivetrain, the electrical generator, the converter, and the transformer. The system has an upper cooling circuit, with a reservoir disposed below the nacelle. The reservoir has at least one pair of annular chambers and a lid that freely rotates about its axis and about the nacelle yaw axis. Coolant flows from a first annular chamber to a second annular chamber through a heat exchanger in the nacelle, thereby carrying heat from the nacelle to the second annular chamber. The system also has a lower cooling circuit, having a coil that connects the first annular chamber to the second annular chamber and being exposed to the outside of the wind turbine. Coolant flows from the second annular chamber to the first annular chamber through the coil, thereby dissipating the heat to ambient air.

US Patent:

20170260836, Sep 14, 2017

Filed:

Mar 2, 2017

Appl. No.:

15/448231

Inventors:

- Houston TX, US
Peri SABHAPATHY - Northville MI, US
Benson THOMAS - Pearland TX, US

International Classification:

E21B 43/12
F04B 49/10
E21B 47/00
F04B 53/16
F04B 47/04
F04B 49/06
F04B 47/02

Abstract:

A hydraulic pumping system for use with a subterranean well can include an actuator with a displaceable actuator member, a magnet device that displaces with the actuator member, the magnet device including at least one permanent magnet positioned between low magnetic permeability elements, and a sensor that senses a magnetic flux propagated from the magnet device. The actuator can include a cylinder, and the sensor can include an outer tube, with materials of the cylinder and outer tube having substantially a same magnetic permeability. An enclosure can be positioned exterior to the cylinder, with the sensor being positioned at least partially in the enclosure. The enclosure can be configured to focus the magnet flux, so that it propagates to the sensor.