Temperature gradient reduction using building model and HVAC blower
First Claim
1. A method of reducing temperature gradients in a building having multiple rooms, the building also having an HVAC system that includes at least one thermostat, at least one blower, one or more air treatment components for cooling the air, heating the air, or both, the method comprising the steps of:
- measuring a temperature TST at the thermostat and a temperature Ti of a room i in the building over a period of time Δ
tmeasure that includes operation of the HVAC system;
determining the operating states of the HVAC system during the period of time Δ
tmeasure;
providing a model MΔ
Ti of a temperature difference Δ
Ti between the temperature at the thermostat TST and the temperature Ti of room i as function of the operating state of the HVAC system;
repeating said steps of measuring, determining, and providing for N−
1 additional rooms in the building so as to provide a model MΔ
Ti of the temperature difference Δ
Ti between the temperature at the thermostat TST and the temperature Ti of each such additional room as a function of the operating state of the HVAC system for a total of N rooms;
combining N models MΔ
Ti of the N rooms in the building so as to create an overall model MΔ
T-ALL of the building; and
using the model MΔ
T-ALL to determine whether to operate the blower so as to reduce one or more temperature gradients in the building, wherein using the model MΔ
T-ALL to determine whether to operate the blower comprisesusing model MΔ
T-ALL to predict temperatures TBL-ON in the building when the blower is operated,using model MΔ
T-ALL to predict temperatures TBL-OFF in the building when the blower is not operated, andactivating the blower, at least one of the air treatment components, or both when the difference between TBL-ON and TBL-OFF exceeds a predetermined value.
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Accused Products
Abstract
A system is provided for reducing temperature gradients within a building. For example, temperature gradients between the air temperature measured at a thermostat controlling an HVAC system and the air temperature in one or more rooms of the building can be reduced. A model of the building is created by measuring the temperature gradient between the thermostat and one or more rooms of the building. This model is used to determine the operation of the HVAC system so as to reduce one or more of such temperature gradients.
36 Citations
17 Claims
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1. A method of reducing temperature gradients in a building having multiple rooms, the building also having an HVAC system that includes at least one thermostat, at least one blower, one or more air treatment components for cooling the air, heating the air, or both, the method comprising the steps of:
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measuring a temperature TST at the thermostat and a temperature Ti of a room i in the building over a period of time Δ
tmeasure that includes operation of the HVAC system;determining the operating states of the HVAC system during the period of time Δ
tmeasure;providing a model MΔ
Ti of a temperature difference Δ
Ti between the temperature at the thermostat TST and the temperature Ti of room i as function of the operating state of the HVAC system;repeating said steps of measuring, determining, and providing for N−
1 additional rooms in the building so as to provide a model MΔ
Ti of the temperature difference Δ
Ti between the temperature at the thermostat TST and the temperature Ti of each such additional room as a function of the operating state of the HVAC system for a total of N rooms;combining N models MΔ
Ti of the N rooms in the building so as to create an overall model MΔ
T-ALL of the building; andusing the model MΔ
T-ALL to determine whether to operate the blower so as to reduce one or more temperature gradients in the building, wherein using the model MΔ
T-ALL to determine whether to operate the blower comprisesusing model MΔ
T-ALL to predict temperatures TBL-ON in the building when the blower is operated,using model MΔ
T-ALL to predict temperatures TBL-OFF in the building when the blower is not operated, andactivating the blower, at least one of the air treatment components, or both when the difference between TBL-ON and TBL-OFF exceeds a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reducing temperature gradients in a building that includes multiple temperature zones, the method comprising the steps of:
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obtaining the temperatures at a thermostat in the building and in a first temperature zone of the building over a first period of time, the building having multiple temperature zones, the building also having an HVAC system that includes at least one thermostat, at least one blower, one or more air treatment components for cooling the air, heating the air, or both, the first period of time occurring while the blower and at least one air treatment component of the HVAC system is operating; acquiring the temperatures at the thermostat and the first temperature zone of the building over a second period of time, the second period of time occurring while only the blower of the HVAC system is operating; developing a model of the temperature in first temperature zone as a function of the state of the HVAC system using temperatures from said steps of obtaining and acquiring; repeating said steps of obtaining, acquiring, and developing for one or more additional temperature zones of the building so as to provide a model for each such additional temperature zone; combining the models from said steps of developing and repeating so as to provide an overall model for multiple temperature zones of the building; and using the overall model to determine when to operate the blower of the HVAC system so as to reduce temperature gradients between one or more temperature zones in the building and the thermostat, wherein using the overall model to determine when to operate the blower comprises predicting with the overall model the temperatures in one or more temperature zones when the blower of the HVAC system is operated for a period of time, calculating with the overall model the temperatures in one or more temperature zones when the blower of the HVAC system is not operated for a period of time operating the blower when the average of the temperatures from said step of calculating exceeds the average of the temperatures from said step of predicting. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification