Intelligent setpoint changeover for a programmable thermostat
First Claim
1. An apparatus to match initiation of temperature changeover settings of a thermostat to a duty cycle of an air temperature conditioning plant without degrading comfort level comprising:
- a programmable changeover thermostat;
an input means for programming said thermostat with changeover temperature settings at selectable time of day periods;
a clock means to determine time of day;
a timing means for determining the length of time of an "on" portion and an "off" portion of said duty cycle of said air temperature conditioning plant;
a comparison means to determine a time until an upcoming temperature conditioning plant cycle;
a means to advance or delay said temperature changeover until the beginning of the upcoming "on" period or upcoming "off" period of the upcoming duty cycle or the last "on" period or the last "off" period of the last duty cycle of said air temperature conditioning plant when the time until the upcoming temperature changeover is less than the time of the last "on" period duty cycle or less than the time of the last "off" period duty cycle of said air temperature conditioning plant.
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Accused Products
Abstract
An apparatus to match initiation of temperature changeover settings of a thermostat to a duty cycle of an air temperature conditioning plant without degrading the comfort level of the area of temperature modification. The apparatus prevents short-cycling of either a heating or a cooling system which can occur due to changes in the setpoint temperature. The apparatus operates by determining the length of time of "on" portion and"off" portion of the duty cycle of the air temperature conditioning plant. It then determines the time until the upcoming cycle of the temperature conditioning plant and either advances or delays the temperature changeover until the beginning of the upcoming "on" period or the upcoming "off" period of the upcoming duty cycle, or the last "on" period or the last "off" period of the last duty cycle of the air temperature conditioning plant.
68 Citations
18 Claims
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1. An apparatus to match initiation of temperature changeover settings of a thermostat to a duty cycle of an air temperature conditioning plant without degrading comfort level comprising:
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a programmable changeover thermostat; an input means for programming said thermostat with changeover temperature settings at selectable time of day periods; a clock means to determine time of day; a timing means for determining the length of time of an "on" portion and an "off" portion of said duty cycle of said air temperature conditioning plant; a comparison means to determine a time until an upcoming temperature conditioning plant cycle; a means to advance or delay said temperature changeover until the beginning of the upcoming "on" period or upcoming "off" period of the upcoming duty cycle or the last "on" period or the last "off" period of the last duty cycle of said air temperature conditioning plant when the time until the upcoming temperature changeover is less than the time of the last "on" period duty cycle or less than the time of the last "off" period duty cycle of said air temperature conditioning plant. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9)
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6. An apparatus to match initiation of temperature changeover settings of a thermostat to a duty cycle of an air temperature conditioning plant without degrading comfort level of claim I, wherein said means to advance or delay said temperature changeover advances said temperature changeover by changing said changeover temperature setting to said upcoming changeover temperature setting until the time of day period equals the upcoming changeover time of day period when the time until the upcoming temperature changeover is less than the time of the last "off" period of said air temperature conditioning plant.
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10. A method to match initiation of temperature changeover settings of a thermostat to a duty cycle of an air temperature conditioning plant without degrading occupant comfort level comprising the steps of:
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presetting a programmable changeover thermostat with a sequence of changeover temperature and time of day settings for initiation of each changeover temperature; determining the length of time of an "on" portion and an "off" portion of a duty cycle of said air temperature conditioning plant; determining a time until an upcoming temperature conditioning plant cycle; and advancing or delaying said temperature changeover until the beginning of the upcoming "on" period or upcoming "off" period of the upcoming duty cycle or the last "on" period or the last "off" period of the last duty cycle of said air temperature conditioning plant when the time until the upcoming temperature changeover is less than the time of the last "on" period duty cycle or less than the time of the last "off" period duty cycle of said air temperature conditioning plant. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification