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| Circuitry for the timing data output enable pulses |
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Air circulation system and method with return duct ventilation
| Details |
Inventors: Blalock, D. Braxton;
Assignee:
Primary Examiner: Joyce; Harold
Assistant Examiner:
Attorney, Agent or Firm: Thomas, Kayden, Horstemeyer & Risley, LLP
An air circulation system with standard and dual mode operations rapidly ventilates an enclosed area with fresh external air in the dual mode. In the dual mode of operation of the preferred embodiment, multiple barriers operate to create two airflow pathways. Two return air duct apertures are opened to expose the return air duct to an external air supply area via a fresh air duct. The fresh air duct includes an opening to the external air supply area and two extensions that are coupled to the return air duct apertures. The barriers simultaneously operate to block the return air duct between the two return air duct apertures to form two distinct return air duct segments. A central air unit and an exit fan, such as an attic fan, cooperate with the barriers to establish two airflow pathways through the return air duct segments. The first airflow pathway extends from the external air supply area through the fresh air duct through the first return air duct segment directly into the enclosed area before removal by the exit fan, and the second airflow pathway extends from the external air supply area through the fresh air duct through the second return air duct segment through the central air unit through a supply duct into the enclosed area before removal by the exit fan. |
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DETAILED DESCRIPTION According to the first preferred embodiment of the present invention, an air circulation system with standard and dual mode operations is utilized to rapidly ventilate an enclosed area with fresh external air.
In the standard mode of operation, which is equivalent to a conventional air conditioning scheme, a central air conditioning unit draws air from the enclosed area through the return air duct.
It then conditions the air before discharging the conditioned air into the enclosed area through the supply air duct.
After the air is allowed to spread into the enclosed area, the central air unit draws the air back for reconditioning via the return air duct, and the process is repeated.
In the dual mode of operation, multiple barriers operate to create two airflow pathways.
Two return air duct apertures are opened to expose the return air duct to an external air supply area via a fresh air duct.
The fresh air duct includes an opening to the external air supply area and two extensions that are coupled to the return air duct apertures.
The barriers simultaneously operate to block the return air duct between the two return air duct apertures to form two distinct return air duct segments.
The central air unit and an exit fan, such as an attic fan, are employed to establish two airflow patterns through the respective airflow pathways.
The exit fan creates the first air flow pattern by drawing external air from the external air supply area through the fresh air duct.
A filter mounted to the fresh air duct, filters external air of any impurities, such as pollen, bugs, smoke, and odors, before the air is drawn into the fresh air duct.
The exit fan draws filtered external air from the fresh air duct through the first duct extension and into the enclosed area through the first return air duct segment, where the exit fan expels the air from the area.
Note that the airflow direction in a portion of the return air duct is reversed from the standard mode of operation.
In the first preferred embodiment of this present invention, an auxiliary fan is mounted within the first fresh air duct extension to supplement the exit fan by independently drawing filtered external air from the fresh air duct and forcing the air into the enclosed area
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Processing Data 
