Heating, ventilation and air conditioning capacity monitor
First Claim
1. An HVAC system capacity determining mechanism comprising:
- an outdoor thermometer;
an occupancy profile indicator of a space where an HVAC system provides heating, ventilation and air conditioning;
a relative degree days indicator for a location of the space;
a set point indicator of a thermostat connected to the HVAC system;
a runtime instrument for measuring accumulated runtime of the HVAC system;
a HVAC system capacity calculator connected to the set point indicator, the outdoor thermometer, the runtime instrument, the occupancy profile indicator, and the relative degree days indicator to determine an effective capacity ratio; and
an alert indicator connected to the capacity calculator.
1 Assignment
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Accused Products
Abstract
A system for light commercial building solutions (LCBS). Solutions and other systems may incorporate lightweight alerting service, auto-adjustment of gateway poll rates based on the needs of various consuming applications, detecting loss of space comfort control in a heating, ventilation and air conditioning (HVAC) system, HVAC capacity loss alerting using relative degree days and accumulated stage run time with operational equivalency checks, and HVAC alerting for loss of heat or cool capacity using delta temperature and dependent system properties. Also, incorporated may be triggering s subset of analytics by automatically inferring HVAC equipment details from controller configuration details, ensuring reliability of analytics by retaining logical continuity of HVAC equipment operational data even when controllers and other parts of the system are replaced, and an LCBS gateway with workflow and mechanisms to associate to a contractor account.
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Citations
21 Claims
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1. An HVAC system capacity determining mechanism comprising:
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an outdoor thermometer; an occupancy profile indicator of a space where an HVAC system provides heating, ventilation and air conditioning; a relative degree days indicator for a location of the space; a set point indicator of a thermostat connected to the HVAC system; a runtime instrument for measuring accumulated runtime of the HVAC system; a HVAC system capacity calculator connected to the set point indicator, the outdoor thermometer, the runtime instrument, the occupancy profile indicator, and the relative degree days indicator to determine an effective capacity ratio; and an alert indicator connected to the capacity calculator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for setting a capacity loss alert, comprising:
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calculating an effective capacity ratio using an HVAC system capacity calculator; determining that a clear reference flag is set; determining whether the last specified interval set point schedule profile matches a set point profile of a reference; comparing the effective capacity ratio to a reference ratio to determine whether the ratio is less than X percent of the reference ratio; sending a signal to an alert indicator connected to the HVAC system capacity calculator if the ratio is equal to or greater than X percent of the reference ratio; and generating a loss of capacity alert using the alert indicator in response to receiving the signal; and X is a predetermined number. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A HVAC capacity loss alert system comprising:
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a recorder of relative degree time units; and a recorder of adjusted equipment run time; and wherein a relative degree time unit is a result of a calculation that integrates a difference in outdoor air temperature from current set points for a time unit; and an effective capacity ratio of relative degree time units for a duration to the adjusted equipment run time is made, when effective occupied profiles match. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification