Detection of clogged filter in an HVAC system
First Claim
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1. A control for an HVAC system comprising:
- an input to receive a measurement indicative of a pressure within an HVAC system, the HVAC system having an air inlet, a temperature conditioning device, a fan, and an outlet downstream of the temperature conditioning device to deliver conditioned air into an environment, the HVAC system to be controlled by said control, and said control being operable to determine a condition of a filter utilized with the HVAC system based upon said measurement, and said measurement being taken between the inlet and the outlet of the HVAC system, said control being an electronic control, and said input receiving an electronic signal as the measurement.
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Abstract
Static pressures are measured in an HVAC system and utilized to predict the condition of a filter in the HVAC system. As the filter becomes clogged, the static pressure can be expected to increase. Changes in the static pressure are determined periodically, and utilized to predict the condition of the filter. A display provides a user with an indication of the current condition of the filter, and a recommendation to replace the filter once it reaches a predetermined condition.
43 Citations
26 Claims
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1. A control for an HVAC system comprising:
an input to receive a measurement indicative of a pressure within an HVAC system, the HVAC system having an air inlet, a temperature conditioning device, a fan, and an outlet downstream of the temperature conditioning device to deliver conditioned air into an environment, the HVAC system to be controlled by said control, and said control being operable to determine a condition of a filter utilized with the HVAC system based upon said measurement, and said measurement being taken between the inlet and the outlet of the HVAC system, said control being an electronic control, and said input receiving an electronic signal as the measurement. - View Dependent Claims (2, 3, 21, 25)
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4. An HVAC system comprising:
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a fan, and a supply duct for supplying air to said fan, said fan being operable to deliver air from said supply duct to an environment to be conditioned, and a filter mounted to remove impurities from said air being delivered by said fan to said environment; a control being operable to receive an indication of pressures within said system, and said pressures being taken between an inlet to said supply duct, and an outlet of said HVAC system at which air is delivered to said environment, and said control determining the condition of said filter based upon said pressures; and said pressures received by said control includes both a previous pressure and a current pressure, and the difference between said current and previous pressures being utilized to provide an indication of the condition of a filter. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 22, 23)
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15. A method of determining the condition of a filter in an HVAC system comprising the steps of:
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(1) providing an HVAC system including a filter for filtering air being delivered by said HVAC system to an environment to be conditioned, and an inlet to said HVAC system being upstream of said filter, and an outlet of said HVAC system leading into said environment; (2) moving air through said filter and to said environment; (3) measuring a pressure within said system, and utilizing said measured pressure to determine a current condition of said filter, and said pressure being measured between said inlet and said outlet, and said determination of the current condition of the filter being performed by an electronic control, with said measured pressure being sent to said electronic control as an electronic signal. - View Dependent Claims (16, 17, 18, 19, 20, 24, 26)
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Specification