A - Human Necessities – 47 – F
Patent
A - Human Necessities
47
F
62/108
A47F 3/04 (2006.01) F25D 21/12 (2006.01)
Patent
CA 1111668
REFRIGERATION SYSTEM USING AIR DEFROST ABSTRACT OF THE DISCLOSURE A refrigeration system employing ambient air defrost and a method of operating such a system. The refrigeration system includes a cabinet having an opening in one of its walls, for example, the front wall, for enabling access to products stored on a plurality of shelves in the interior of the cabinet. Extending along the walls of the cabinet are an inner, primary air conduit and an outer, secondary air conduit. The primary air conduit contains a plurality of fans for circulating the air along the conduit and a mechanism for refrigerating air passing through the conduit during a refrigeration cycle. Air leaves the primary conduit at an outlet opening at one end of the conduit positioned at one end of the opening in the cabinet and such air is directed towards an inlet opening in the primary conduit at the opposite end of the opening in the cabinet. Thus, the air circulated through the primary conduit forms a closed primary air band. A plurality of second fans are arranged within the secondary air conduit and during a refrigeration cycle circulate air through the conduit, out of an outlet open- ing in the conduit, which opening is located at one end of the opening in the cabinet and towards an inlet opening in the conduit, which opening is located at the other end of the open- ing in the cabinet, thereby establishing a closed secondary air band during the refrigeration cycle. When the system is to be defrosted, the refrigeration mechanism is deactivated so that the air passing along the primary air conduit is not refrigerated. In -1- addition, the secondary fans in the secondary air conduit are turned off and the primary fans in the primary conduit are operated so as to cause a greater quantity of air to pass along the primary air conduit. During the defrost mode of operation, the primary air fans tend to draw in ambient air from outside of the cabinet thereby providing warmer air for circulation through the primary air conduit which serves to defrost the re- frigeration mechanism. -2-
344945
George H. Riches And Associates
Tyler Refrigeration Corporation
LandOfFree
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