Abstract

Novel twisted blades with an air foil for use with air conditioner condensers and heat pumps that provide improved airflow efficiency to minimize operating power requirements having an overall diameter across the blades being approximately 19 inches, and approximately 27.6 inches. The blades (AC-A) can run at approximately 840 rpm to produce approximately 2200 cfm of air flow using approximately 110 Watts of power from an 8-pole motor. Using an OEM 6-pole 1/8 hp motor produced approximately 2800 cfm with approximately 144 Watts of power while running the blades at approximately 1100 rpm. Power savings were 25% (50 W) over the conventional configuration. A second version of the fan (AC-B) with some refinements to the flow geometry produced a similar air flow while using only 131 W of power at 1100 rpm. Power savings were 32% (62 W) over the conventional configuration. Embodiments can include two, three, four and five blades equally spaced apart from one another about hubs. Additionally,

Document Type

Patent

Patent Number

US 7,568,885

Application Serial Number

11/207,501

Issue Date

8-4-2009

Current Assignee

UCFRF

Assignee at Issuance

UCFRF

College

Florida Solar Energy Center (FSEC)

Department

FSEC

Allowance Date

4-23-2009

Filing Date

8-19-2005

Assignee at Filing

UCFRF

Filing Type

Nonprovisional Application Record

Donated

no

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