Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1982-07-06
1984-04-03
Tapolcai, William E.
Refrigeration
Processes
Defrosting or frost inhibiting
62256, A47F 304
Patent
active
044399928
ABSTRACT:
A well type open top refrigerated display case has a primary air conduit extending around the cabinet and main fans for circulating air through the primary conduit and across the open top of the cabinet in the form of an air curtain. Defrost fans are mounted in the case to draw ambient air from above the refrigerated display case into an upper portion of the primary conduit at a higher pressure than the air pressure in the region of the open top. Defrost control means are provided for energizing the defrost fans at the start of a defrost cycle to propel a portion of the higher pressure ambient air out of the primary conduit through an air opening to collide with an air curtain flowing across the open top, the flow of the air curtain being thereby reversed and caused to flow over the top of and outside the display case. A further portion of ambient air is drawn downwardly by the main fans to flow through the primary conduit and assist in defrosting the coils.
REFERENCES:
patent: 2929227 (1960-03-01), Rainwater
patent: 4106305 (1978-08-01), Ibrahim
patent: 4120174 (1978-10-01), Johnston
patent: 4182130 (1980-01-01), Ljung
patent: 4271680 (1981-06-01), Karashima
patent: 4320631 (1982-03-01), Vana
patent: 4337626 (1982-07-01), Ibrahim
Tapolcai William E.
Tyler Refrigeration Corporation
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