Technique for detecting and predicting air filter condition
First Claim
1. A method of detecting air filter clogging for an air handling system comprising the steps of:
- a) determining a system resistance;
b) comparing said determined system resistance to a threshold value; and
c) determining that the air filter is plugged in response to said determined system resistance being greater than a threshold value.
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Accused Products
Abstract
A method and system for detecting and predicting air filter condition for an air handling system operates by determining a system resistance to air flow. The system resistance is utilized to determine a detection statistic indicative of current filter condition and to predict remaining life of the air filter. The system resistance is determined using models that approximate the expected operation of the air handling system. The approximation is then compared to actual values to obtain a difference. Once the difference between the approximated value exceeds a threshold value, an alarm is initiated that is indicative of system resistance. The remaining air filter life is then determined by using historically gathered data, or by using a known degradation rate of the air filter. Once the remaining life of the air filter is estimated, replacement can be scheduled that would coincide with other maintenance.
115 Citations
33 Claims
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1. A method of detecting air filter clogging for an air handling system comprising the steps of:
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a) determining a system resistance;
b) comparing said determined system resistance to a threshold value; and
c) determining that the air filter is plugged in response to said determined system resistance being greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of predicting air filter clogging for a heating, ventilating and air conditioning system comprising the steps of:
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a) determining a system resistance value;
b) calculating a detection statistic value utilizing said determined filter resistance value;
c) comparing said detection statistic value with a threshold value and indicating an alarm based on said comparison; and
d) predicting a time for air filter replacement based on said detection statistic. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for monitoring an air handling system comprising:
a controller for receiving data indicative of a system resistance of the air handling system, comparing the system resistance to a threshold value, and determining that an air filter of the air handling system is plugged in response to the system resistance being greater than said threshold value. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification