Glass door for refrigerated display case - has air conduit extending around case forming air curtain across door opening during refrigeration cycle

摘要

A refrigerated display case has a display section within a cabinet and movable door covering the access opening to the display section. An air conduit extends along the top, bottom and rear walls of the cabinet. The air conduit has an outlet opening and an inlet opening and air leaving the outlet opening will be directed towards and received by the inlet opening forming an air curtain across the front opening of the cabinet along the path inside the door. During a refrigeration cycle of operation of the display case, refrigerated air is circulated through the air conduit and a refrigeration mechanism arranged within the conduit by a positive pressure air flow. This establishes a refrigerated air band and a refrigerated air curtain across the front opening in the cabinet. During a defrost cycle of operation, the refrigeration mechanism is turned off and the door covering the front access opening is slightly opened. Ambient air is then drawn into the air conduit and circulated through the conduit.