Rakesh Goel

US Patent:

7566359, Jul 28, 2009

Filed:

Nov 7, 2006

Appl. No.:

11/557334

Inventors:

Rakesh Goel - Irving TX, US
Ammar Kailani - Richardson TX, US

Assignee:

Lennox Manufacturing Inc. - Richardson TX

International Classification:

B01D 39/00
A61L 2/08
G01J 1/32

US Classification:

96224, 422 24, 250205

Abstract:

A heating, ventilating and air conditioning (HVAC) system, comprising a heat exchanger plenum having a surface located therein that is susceptible to degradation upon exposure to light, and a light bulb located within the plenum. In one embodiment, the light bulb has a side directed toward the surface and a light-absorptive barrier coupled to the side. The light-absorptive barrier is configured to reduce direct light transmission from the light bulb to the surface to thereby inhibit degradation of the surface. The invention further provides an HVAC system comprising a light bulb configured to emit photonic energy, and an absorptive barrier coupled to at least a portion of an outside of the bulb. The absorptive barrier is configured to substantially reduce transmission of the emitted photonic energy beyond the portion of the bulb.

US Patent:

20110011112, Jan 20, 2011

Filed:

Jul 20, 2009

Appl. No.:

12/505664

Inventors:

Rakesh Goel - Irving TX, US
Randy Lisbona - Coppell TX, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F25D 27/00
F25D 21/14
B21D 53/02

US Classification:

62264, 62291, 2989003

Abstract:

A heating, ventilating and air conditioning (HVAC) unit. The unit comprises a heat exchanger or drain pan located inside a HVAC housing that has one or more access openings and ultraviolet light-sensitive components therein. The unit also comprises a light located inside of the HVAC housing and a light shield located between the heat exchanger or drain pan and the light source. The light source includes a network of open-ended cells, each cell having ultraviolet light reflective walls. The light shield is oriented to direct an ultraviolet light from the light source through the open-ended cells towards the heat exchanger or drain pan and away from the one or more access openings and ultraviolet light-sensitive components.

US Patent:

20130213068, Aug 22, 2013

Filed:

Feb 21, 2012

Appl. No.:

13/401430

Inventors:

Rakesh Goel - Irving TX, US
Shailesh Manohar - Coppell TX, US

International Classification:

F25B 49/00
B23P 15/26

US Classification:

62129, 29890035

Abstract:

A space conditioning system for conditioning air within an enclosed space. The system comprises a refrigeration subsystem configured to circulate a flammable refrigerant there-through. The refrigeration subsystem also comprises a safety module configured to include either: a leak-detector subunit, or, a start-up subunit. The leak-detector subunit is configured to monitor for a leak of the flammable refrigerant from the refrigeration subsystem, and, to generate an alarm signal if the leak is detected. The start-up subunit is configured to turn on one or more airflow devices configured to vent or mix a leaked flammable refrigerant.

US Patent:

20220412593, Dec 29, 2022

Filed:

Aug 30, 2022

Appl. No.:

17/823456

Inventors:

- Richardson TX, US
Rakesh Goel - Irving TX, US

International Classification:

F24F 11/43
F24F 11/64
F24F 11/65
G05B 13/02
F25B 49/02

Abstract:

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

US Patent:

20210372884, Dec 2, 2021

Filed:

Aug 18, 2021

Appl. No.:

17/405169

Inventors:

- Richardson TX, US
Rakesh Goel - Irving TX, US

International Classification:

G01M 13/023
F24F 11/77
F24F 11/86
F24F 11/52
F24F 11/63

Abstract:

An HVAC system includes a blower. The blower includes a driven pulley and a motor with a driver pulley. A motor drive supplies electrical power to the motor. A controller receives a benchmark rate of the flow of air provided by the blower and a corresponding benchmark output current of the motor drive. A benchmark input power corresponding to the benchmark output current is determined based on a predetermined relationship between input power and output current for the motor drive. A ratio of the benchmark rate of the flow of air provided by the blower to the benchmark input power is determined. The controller determines a pulley ratio for the blower based on this ratio.

US Patent:

20210108857, Apr 15, 2021

Filed:

Oct 15, 2019

Appl. No.:

16/653040

Inventors:

- Richardson TX, US
Siddarth Rajan - Chennai, IN
Rakesh Goel - Irving TX, US

International Classification:

F28D 1/04
F24F 11/52
F24F 5/00

Abstract:

An HVAC system includes an evaporator, a first sensor coupled to the evaporator at a first position, and a second sensor operably coupled to the evaporator at a second position. The first sensor monitors a first temperature of the refrigerant flowing in the evaporator at the first position, which is adjacent to the evaporator inlet. The second sensor monitors a second temperature of the refrigerant flowing in the evaporator at the second position, which is downstream from the first position. The system includes a controller, which receives a first signal corresponding to the first temperature and a second signal corresponding to the second temperature. The controller determines, based on the received signals, a temperature difference between the second temperature and the first temperature. In response to determining that the temperature difference is greater than a predefined threshold value, the controller determines that a loss of charge has occurred.

US Patent:

20210088243, Mar 25, 2021

Filed:

Sep 24, 2019

Appl. No.:

16/580486

Inventors:

- Richardson TX, US
Rakesh Goel - Irving TX, US

International Classification:

F24F 11/43
F24F 11/64
F24F 11/65
F25B 49/02
G05B 13/02

Abstract:

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

US Patent:

20210025630, Jan 28, 2021

Filed:

Oct 8, 2020

Appl. No.:

17/065663

Inventors:

- Richardson TX, US
Rakesh GOEL - Irving TX, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F25B 49/02
F25B 39/02

Abstract:

Provided are a method and apparatus for controlling the operation of a compressor of an HVAC system in response to the refrigerant super heat value for refrigerant within the compressor. First and second signals are received for indicating one or more temperature values of refrigerant substantially at the first compressor sump and within the first distributor tube, respectively. A saturated suction temperature is estimated using at least the second signal. A first super heat value is calculated for refrigerant substantially at the first compressor sump using at least the saturated suction temperature and the one or more temperature values indicated by the first signal. A first control signal is generated for at least de-energizing the first compressor if the calculated first super heat value is below a tolerance value defining the minimum super heat value at which the first compressor may be operated.