Lennox Industries Inc.

Rohini Brahme

Santhosh Kumar Selvam

Umesh Gokhale

Mark W Olsen

Pete Hrejsa

Leema Kulandaisamy

Alwin Sebastian John

Chao Xia

Peter Hrejsa

Derek Phillips

Ajay Iyengar

Jeeson Kangirathingal Joy

An HVAC system is configured to regulate a temperature of a space. The HVAC system includes means for compressing a refrigerant used to cool air provided to the space and a controller communicatively coupled to the means for compressing. The controller determines that a demand response time period is starting at a start time. After determining that the demand response time period is starting at the start time, an operation schedule is determined indicating alternating portions of the demand response period during which the means for compressing is to be turned off and turned on. At or after the start time of the demand response time period, the controller begins operating the means for compressing according to the determined operation schedule.

HVAC system with improved operation of a single-staged compressor during a peak demand response

A system includes multiple HVAC systems. After receiving a demand request, a multiple-system controller a first anticipated power consumption associated with operating a first HVAC system at a first temperature setpoint during a future period of time of the demand response request and a second anticipated power consumption associated with operating a second HVAC system at a second temperature setpoint during the future period of time. Based at least in part on the first and the second anticipated power consumptions, a staging schedule is determined that indicates when to operate the first and second HVAC systems.

Automatic staging of multiple HVAC systems during a peak demand response

An HVAC system is configured to regulate a temperature of a space. The HVAC system includes a single-stage compressor configured to compress a refrigerant used to cool air provided to the space and a controller communicatively coupled to the single-stage compressor. The controller determines that a demand response time period is starting at a start time. After determining that the demand response time period is starting at the start time, an operation schedule is determined indicating alternating portions of the demand response period during which the single-stage compressor is to be turned off and turned on. At or after the start time of the demand response time period, the controller begins operating the single-stage compressor according to the determined operation schedule.

HVAC system with improved operation of a single-stage compressor during a peak demand response

A system includes multiple HVAC systems. After receiving a demand request, a multiple-system controller determines a first anticipated power consumption associated with operating a first HVAC system at a first temperature setpoint during a future period of time of the demand response request and a second anticipated power consumption associated with operating a second HVAC system at a second temperature setpoint during the future period of time. Based at least in part on the first and the second anticipated power consumptions, a staging schedule is determined that indicates when to operate the first and second HVAC systems.

During an initial period of time, an HVAC controller stores a record of an energy demand of the HVAC system that corresponds to an amount of energy used to operate the HVAC system. For a future time period, an anticipated energy demand of the HVAC system is determined. The controller then recursively determines, for each of a plurality of time points within the future time period, an anticipated indoor humidity value using the anticipated energy demand and the record of the energy demand. The HVAC system is operated based at least in part on the anticipated indoor humidity value.

Proactive system control using humidity prediction

A method of operating an HVAC system using a controller includes predicting a first predicted temperature of an enclosed space during an unoccupied time with the HVAC system off. The controller determines if the first predicted temperature is less than a set-point temperature. Responsive to a determination that the first predicted temperature is less than the set-point temperature, the controller predicts a second predicted temperature of the enclosed space if the HVAC system is operated for a first runtime. The controller determines if the second predicted temperature is less than the set-point temperature and, responsive to a determination that the second predicted temperature is not less than the set-point temperature, the controller operates the HVAC system for the first runtime.

Method and system for heating auto-setback

During an initial period of time, an HVAC controller receives an indoor humidity and an outdoor humidity. A record of an energy demand of the HVAC system is stored for each indoor humidity and outdoor humidity. For a future time period, an anticipated energy demand of the HVAC system is determined. The controller then recursively determines, for each of a plurality of time points within the future time period, an anticipated indoor humidity value using the anticipated energy demand and the record of the energy demand. The HVAC system is operated based at least in part on the anticipated indoor humidity value.

A method for operating a heating, ventilation, and air condition ('HVAC') system includes determining a current temperature of the enclosed space and receiving a first comfort temperature. The method further including determining, based on a selection of a time period, a first consumption value indicating a predicted amount of energy required to maintain the first comfort temperature for the time period, wherein the first consumption value is determined based at least on a first predicted value and a second predicted value, the first predicted value being indicative of an amount of energy required to condition the enclosed space to the first comfort temperature from the current temperature and the second predicted value being indicative of an amount of energy required to, upon conditioning the enclosed space to the first comfort temperature, maintain the first comfort temperature for the time period.

Systems and methods of predicting energy usage

According to certain embodiments, operating an HVAC system comprises receiving zone temperature data from a temperature sensor, zone humidity-ratio data from a humidity sensor, a temperature set point from a user, and a relative-humidity set point from a user. A humidity-ratio set point is determined based on the temperature and relative-humidity set points. A first command to the HVAC system to perform a cooling operation is communicated upon determining that the temperature data exceeds a temperature threshold based on the temperature set point. Determining if the humidity data has reached a humidity-ratio threshold based on the humidity-ratio set point after determining that the temperature data has reached the temperature threshold. Operating the HVAC system according to a dehumidification-based cooling procedure upon determining that the humidity data has not reached the humidity-ratio threshold.

Dehumidification technique for heating ventilation and air conditioning systems

A method includes receiving a setpoint and a time of interest indicating a time in the future when the setpoint is to be reached and obtaining a first data set comprising a plurality of lag values, the plurality of lag values associated with one or more variables related to the HVAC system. The method further includes selecting a second data set comprising a subset of the lag values from the first data set and determining a predicted condition at the time of interest based at least in part on the lag values in the second data set. The method further includes determining a schedule for operating heating or cooling components of the HVAC system such that the setpoint is reached by the time of interest and communicating one or more signals instructing the HVAC system to operate according to the schedule.

Operating an HVAC system based on predicted indoor air temperature

An HVAC system for a comfort zone includes a compressor, temperature sensor and controller. The controller is configured to receive a starting temperature from the temperature sensor, receive a desired temperature, and receive a desired time for the comfort zone to reach the desired temperature. The controller is further configured to determine a starting time to adjust cooling the comfort zone, the starting time determined based at least on the desired time, the desired temperature, the starting temperature, and a most-energy-efficient operating speed of the compressor. Once the starting time has been reached, the controller is further configured to communicate a command to the HVAC system to operate the compressor at the most-energy-efficient operating speed.

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Irving, TX, United States of America

Rohini Brahme