Refrigeration – Automatic control – Of external fluid or means
Reexamination Certificate
2005-07-29
2010-11-23
Norman, Marc E (Department: 3744)
Refrigeration
Automatic control
Of external fluid or means
C062S228400, C318S067000
Reexamination Certificate
active
07836713
ABSTRACT:
Variable speed drives are utilized in refrigerant systems to operate motors of the system components at varying speeds, typically for the purposes of capacity adjustment, efficiency enhancement, reliability improvement or power consumption limitation. However, variable speed controls are expensive. The present invention offers flexibility to utilize a variable speed drive to provide variable speed functionality between compressor and fans (or other rotating components having electric motors) within a refrigerant system depending on operational and environmental conditions and external load demands. The switching device switches the variable speed drive between component motors as indicated by a control for the refrigerant system.
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patent: 5746062 (1998-05-01), Beaverson et al.
patent: 6257007 (2001-07-01), Hartman
patent: 6370888 (2002-04-01), Grabon
patent: 6579067 (2003-06-01), Holden
patent: 6798159 (2004-09-01), Holden
International Preliminary Report on Patentability dated Feb. 7, 2008.
Search Report PCT/US05/27082, Nov. 8, 2005.
Lifson Alexander
Lord Richard
Taras Michael F.
Carlson & Gaskey & Olds
Carrier Corporation
Norman Marc E
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