DEFROSTING IN OPEN SHOW CASE OF COLD-AIR-CIRCULATION TYPE

摘要

The cold air circulation type open showcase (1) has a passage(4) with a cooler(6) & an air fan(7) to form a cold air curtain across the access opening(3). Another air passage (5) with fan(8) for circulating air forms another protective(5) with fan(8) for circulating air forms another protective layer of air curtain outside of the cold air curtain. The showcase in defrosted by controllably operating the fans to blow air in opposite directions to cause air to flow in short circuited flow at passage openings at the access opening. Air ejected from one passage at the access opening is immediately sucked into the adjacent passage without crossing the access opening to draw in warm outside air into the cool air passage.