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US 6,993,414 B2Granted
Detection of clogged filter in an HVAC system
AssigneeCarrier Corporation
InventorRajendra K. Shah
Life of this patent
Estimating the term…
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.
Claims11
An HVAC system comprising:
- 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 determine the condition of said filter based upon said pressures;
- 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;
- and a display provides an indication of a percentage clogged condition of the filter.
1 more element
An HVAC system comprising:
- a fan and a supply duct for supplying air to 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 determine 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;
- said current and previous pressure are static pressure readings;
- and
- said current and previous static pressure readings are utilized with the following formula to determine filter condition:
- FILTER USED %=(CURRENT-PREVIOUS)/(X*(MAXIMUM-PREVIOUS)),
- wherein x is a multiplier, and MAXIMUM is a previously defined maximum pressure indicative of a clogged filter.
5 more elements
Dependencies are inferred from the claim text.