Patents by Inventor Siddarth RAJAN
Siddarth RAJAN 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: 11927362Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system, where the HVAC system is operating in reheat dehumidification mode. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, determining a decreased compressor speed. The method also includes modulating a variable-speed compressor in the HVAC system in correspondence to the decreased compressor speed.Type: GrantFiled: November 28, 2022Date of Patent: March 12, 2024Inventors: Rakesh Goel, Siddarth Rajan
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Publication number: 20230400237Abstract: A method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperature (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.Type: ApplicationFiled: August 28, 2023Publication date: December 14, 2023Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth Rajan
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Publication number: 20230358454Abstract: An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.Type: ApplicationFiled: July 17, 2023Publication date: November 9, 2023Inventors: Rakesh Goel, Siddarth Rajan, Edward Robinson, Patric Ananda Balan Thobias
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Patent number: 11781793Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperature (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.Type: GrantFiled: December 16, 2020Date of Patent: October 10, 2023Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan
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Patent number: 11754326Abstract: An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.Type: GrantFiled: September 14, 2022Date of Patent: September 12, 2023Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan, Edward Robinson, Patric Ananda Balan Thobias
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Patent number: 11709004Abstract: A method includes measuring a saturated suction temperature, receiving actual temperature value reflective of the measured saturated suction temperature, and determining whether the actual temperature value is less than a first pre-determined minimum threshold temperature value. If the actual temperature value is less than the first pre-determined minimum threshold temperature value, initiating a timer to operate for a pre-determined time interval. Determining whether the actual temperature value is less than a second pre-determined minimum threshold temperature value and if the actual temperature value is less the second pre-determined minimum threshold temperature value, initiating the timer to operate for a modified time interval. If the timer has expired, the operation of the compressor is modified.Type: GrantFiled: December 16, 2020Date of Patent: July 25, 2023Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan
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Publication number: 20230088937Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system, where the HVAC system is operating in reheat dehumidification mode. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, determining a decreased compressor speed. The method also includes modulating a variable-speed compressor in the HVAC system in correspondence to the decreased compressor speed.Type: ApplicationFiled: November 28, 2022Publication date: March 23, 2023Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth RAJAN
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Patent number: 11609046Abstract: 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.Type: GrantFiled: December 14, 2021Date of Patent: March 21, 2023Assignee: Lennox Industries Inc.Inventors: Patric Ananda Balan Thobias, Siddarth Rajan, Rakesh Goel
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Patent number: 11561015Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system, where the HVAC; system is operating in reheat dehumidification mode. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, determining a decreased compressor speed. The method also includes modulating a variable-speed compressor in the HVAC system in correspondence to the decreased compressor speed.Type: GrantFiled: February 22, 2021Date of Patent: January 24, 2023Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan
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Publication number: 20230003429Abstract: An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.Type: ApplicationFiled: September 14, 2022Publication date: January 5, 2023Inventors: Rakesh Goel, Siddarth Rajan, Edward Robinson, Patric Ananda Balan Thobias
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Patent number: 11543163Abstract: An HVAC system includes an evaporator coil and a compressor fluidly coupled to the evaporator coil. A condenser coil is fluidly coupled to the compressor. The condenser coil includes at least one condenser circuit fluidly coupled between a discharge line and an exit manifold. A sub-cool circuit is fluidly coupled between the exit manifold and a liquid line. A first temperature sensor is disposed at an entrance to the sub-cool circuit. A second temperature sensor is disposed at an exit to the sub-cool circuit. An HVAC controller is operatively coupled to the first temperature sensor and the second temperature sensor. The HVAC controller is configured to determine a temperature difference across the sub-cool circuit.Type: GrantFiled: August 23, 2021Date of Patent: January 3, 2023Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan, Patric Ananda Balan
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Patent number: 11480371Abstract: An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.Type: GrantFiled: February 28, 2020Date of Patent: October 25, 2022Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan, Edward Robinson, Patric Ananda Balan Thobias
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Publication number: 20220268456Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system, where the HVAC; system is operating in reheat dehumidification mode. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, determining a decreased compressor speed. The method also includes modulating a variable-speed. compressor in the HVAC system in correspondence to the decreased compressor speed.Type: ApplicationFiled: February 22, 2021Publication date: August 25, 2022Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth RAJAN
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Patent number: 11415347Abstract: A compressor system includes a first compressor and a second compressor. A suction equalization line fluidly couples the first compressor and the second compressor. A first branch suction line is fluidly coupled to the first compressor and a second branch suction line is fluidly coupled to the second compressor. A main suction line is fluidly coupled to the first branch suction line and the second branch suction line. An obstruction device is disposed in at least one of the first branch suction line and the second branch suction line. Responsive to deactivation of at least one of the first compressor and the second compressor, the obstruction device is at least partially closed thereby causing prescribed liquid levels in the first compressor and the second compressor during partial-load operation.Type: GrantFiled: November 11, 2019Date of Patent: August 16, 2022Assignee: Lennox Industries Inc.Inventors: Rakesh Goel, Siddarth Rajan, Patric Ananda Balan Thobias, Abdul Rehman
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Publication number: 20220186996Abstract: In an embodiment, a method of preventing evaporator coil freeze in a heating, ventilation and air conditioning (HVAC) system is performed by a controller in the HVAC system. The method includes determining a reference saturated suction temperate (SST) via a sensor disposed in relation to an evaporator coil in the HVAC system. The method also includes determining whether the reference SST is below a minimum SST threshold. The method also includes, responsive to a determination that the reference SST is below the minimum SST threshold, increasing a discharge air temperature (DAT) setpoint.Type: ApplicationFiled: December 16, 2020Publication date: June 16, 2022Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth Rajan
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Publication number: 20220186997Abstract: A method of mitigating a freeze event in an HVAC system includes measuring a saturated suction temperature, receiving actual temperature value reflective of the measured saturated suction temperature, determining whether the actual temperature value is less than a first pre-determined minimum threshold temperature value, and responsive to a determination that the actual temperature value is less than the first pre-determined minimum threshold temperature value, initiating a timer to operate for a pre-determined time interval. Determining whether the actual temperature value is less than a second pre-determined minimum threshold temperature value.Type: ApplicationFiled: December 16, 2020Publication date: June 16, 2022Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth RAJAN
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Publication number: 20220107135Abstract: 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.Type: ApplicationFiled: December 14, 2021Publication date: April 7, 2022Inventors: Patric Ananda Balan Thobias, Siddarth Rajan, Rakesh Goel
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Patent number: 11274862Abstract: A compressor system includes at least two compressors. A suction equalizing tube fluidly couples the at least two compressors. A plumbing assembly fluidly couples to the first compressor and the second compressor. The plumbing assembly comprises an outlet to each compressor of the at least two compressors. A pressure differential between the at least two compressors is created so as to facilitate maintenance of a desired fluid level in the at least two compressors.Type: GrantFiled: June 22, 2020Date of Patent: March 15, 2022Assignee: LENNOX INDUSTRIES INC.Inventors: Patric Ananda Balan Thobias, Abdul Rehman, Rakesh Goel, Siddarth Rajan
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Patent number: 11248849Abstract: 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.Type: GrantFiled: October 15, 2019Date of Patent: February 15, 2022Assignee: Lennox Industries Inc.Inventors: Patric Ananda Balan Thobias, Siddarth Rajan, Rakesh Goel
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Publication number: 20210381735Abstract: An HVAC system includes an evaporator coil and a compressor fluidly coupled to the evaporator coil. A condenser coil is fluidly coupled to the compressor. The condenser coil includes at least one condenser circuit fluidly coupled between a discharge line and an exit manifold. A sub-cool circuit is fluidly coupled between the exit manifold and a liquid line. A first temperature sensor is disposed at an entrance to the sub-cool circuit. A second temperature sensor is disposed at an exit to the sub-cool circuit. An HVAC controller is operatively coupled to the first temperature sensor and the second temperature sensor. The HVAC controller is configured to determine a temperature difference across the sub-cool circuit.Type: ApplicationFiled: August 23, 2021Publication date: December 9, 2021Applicant: Lennox Industries Inc.Inventors: Rakesh GOEL, Siddarth RAJAN, Patric Ananda BALAN