Claims
- 1. In a refrigerated display cabinet having an access opening for communicating a storage and display space within the cabinet with the ambient air, means for providing at least a primary refrigerated air band and a secondary guard air band across the access opening in substantially the same air flow direction during a normal refrigeration cycle;
- an improved method of defrosting an air cooling mechanism located in the flow path of the primary band, comprising the steps of:
- reversing the flow of air in said secondary band from the flow thereof during said normal refrigeration cycle, whereby ambient air is drawn into said secondary band flow path;
- maintaining the air flow of said primary band in the same direction as in said normal refrigeration cycle to maintain a substantially continuous primary band air curtain across the access opening during both the refrigeration and defrost cycles; and
- diverting at least a significant portion of the reverse flow of air from the secondary band into the primary band between the downstream or return end of the access opening and the air cooling mechanism during the defrost cycle to thereby cause relatively warm air to flow through said air cooling mechanism and defrost same.
- 2. In the refrigerated display cabinet according to claim 1, wherein said means for providing said primary and secondary bands comprise first and second air circulating fan means, respectively;
- said improved defrost method further comprising the step of:
- reversing the air circulating direction of said second fan means during a defrost cycle from the air circulation direction thereof during a refrigeration cycle.
- 3. In the refrigerated display cabinet according to claim 2, the improved defrosting method further comprising the step of:
- reversing the rotating direction of said second fan means during the defrost cycle to thereby reverse the air circulating direction thereof.
- 4. In the refrigerated display cabinet according to claim 1, wherein said second fan means are mounted to a movable baffle, said improved defrosting method comprising the step of:
- pivoting said baffle to thereby reverse the airflow direction of said secondary band without reversing the direction of rotation of the second fan means.
Parent Case Info
This is a division of application Ser. No. 790,654, filed Apr. 25, 1977, now U.S. Pat. No. 4,144,720, issued Mar. 20, 1979.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
790654 |
Apr 1977 |
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