Heat exchanger filter assembly
AssigneeJohnson Controls Technology Company
InventorNicholas P. Mislak
Life of this patent
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Abstract
A system includes a filter assembly having a filter material disposed in an air flow, a first pressure transducer disposed upstream of the filter material with respect to the air flow, a second pressure transducer disposed downstream of the filter material with respect to the air flow, and a controller coupled to the first pressure transducer and the second pressure transducer, where the controller receives feedback from the first pressure transducer and the second pressure transducer indicative of a pressure differential of the air flow across the filter material, and where the controller is configured to index the filter when the pressure differential of the air flow across the filter material exceeds a threshold.
Claims23
A filter assembly comprising:
- a filter material disposed in an air flow;
- a first pressure transducer disposed upstream of the filter material with respect to the air flow;
- a second pressure transducer disposed downstream of the filter material with respect to the air flow;
- and
- a controller coupled to the first pressure transducer and the second pressure transducer, wherein the controller receives feedback from the first pressure transducer and the second pressure transducer indicative of a pressure differential of the air flow across the filter material, and wherein the controller is configured to index the filter material when the pressure differential of the air flow across the filter material exceeds a threshold,
- wherein the filter material, the first pressure transducer, the second pressure transducer, and the controller are disposed in a common housing, and wherein the common housing is configured to be disposed within a cabinet of a heating, ventilation, and air conditioning (HVAC) unit.
A heating, ventilation, and air conditioning (HVAC) unit, comprising:
- a cabinet comprising a passageway configured to flow an air flow;
- a heat exchanger disposed in the cabinet and in a heat exchange relationship with the air flow in the passageway;
- and
- a modular filter assembly configured to be disposed in the cabinet, comprising:
- a housing configured to be disposed in the cabinet upstream of the heat exchanger with respect to the air flow;
- a first member disposed in the housing and comprising a sheet of filter material;
- a second member disposed in the housing and coupled to an end of the filter material, such that the filter material extends across a portion of the passageway between the first member and the second member;
- a drive disposed in the housing and coupled to the second member and configured to rotate the second member;
- and
- a controller disposed in the housing and coupled to the drive, wherein the controller is configured to actuate the drive when a pressure differential of the air flow across the filter material exceeds a threshold, after a predetermined amount of time, or a combination thereof.
A method for replacing filter material of a modular filter assembly, comprising:
- receiving feedback indicative of a first pressure of an air flow through a cabinet of a heating, ventilation, and air conditioning (HVAC) unit upstream of a filter material with respect to the air flow;
- receiving feedback indicative of a second pressure of the air flow through the cabinet of the HVAC unit downstream of the filter material with respect to the air flow;
- determining a pressure differential of the air flow across the filter material based on the first pressure and the second pressure;
- comparing the pressure differential to a threshold pressure differential value;
- and
- actuating a drive of the modular filter assembly when the pressure differential exceeds the threshold pressure differential value, wherein the drive is coupled to a first member of a pair of opposing members of the modular filter assembly, and wherein actuating the drive rotates the first member to replace the filter material with new filter material,
- wherein the filter material, the pair of opposing members, and the drive are disposed in a common housing of the modular filter assembly, and wherein the common housing is configured to be disposed within the cabinet of the HVAC unit.
Dependencies are inferred from the claim text.