Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1981-01-21
1982-07-06
Tapolcai, Jr., William E.
Refrigeration
Processes
Defrosting or frost inhibiting
62256, A47F 304
Patent
active
043376266
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. A column extends upwardly from and above the well type region; defrost fans are located in a defrost conduit in the column. Defrost control means are provided for energizing the defrost fans at the start of a defrost cycle to draw ambient air from above the refrigerated display case into the upper portion of the defrost conduit at a higher pressure than the air pressure in the region of the open top; a portion of the higher pressure ambient air is directed out of the defrost conduit to collide with the 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: 3196626 (1965-07-01), Gabler
patent: 3226945 (1966-01-01), Spencer
patent: 3593358 (1971-07-01), Bachman et al.
patent: 4144720 (1979-03-01), Subera et al.
patent: 4182130 (1980-01-01), Ljung
patent: 4285204 (1981-08-01), Vana
Tapolcai, Jr. William E.
Tyler Refrigeration Corporation
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