Patent ID: 6346041
Filing Date: 2002-02-12
Classification: F24F

Abstract:
An economizer for use within a packaged air conditioning unit having a limited overall available static pressure to deliver a controlled ratio of outside air to return air at different operating conditions, the economizer comprising:(a) an air chamber; (b) a return air duct in communication with said air chamber; (c) a plurality of curved return air dampers disposed within said return air duct and moveable from an open position to a closed position to control the flow of the return air to said air chamber; (d) an outside air duct in communication with said air chamber; (e) a plurality of dampers moveable from an open position to a closed position to control the flow of the outside air to said air chamber; and (f) a control unit adapted to control movement of said curved return air dampers and said outside air damper to deliver a controlled ratio of the outside air to the return air at different operating conditions, during operation of the economizer a significantly low pressure drop occurs across said curved return air dampers.