system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5-Why to grocery stores have refrigerated aisles of food without enclosures? Wouldn't it be more economic to retain the cool air and save money?
gpt
The fridges use a set of nozzles to create laminar flows of cold and hot air to separate the air inside the refrigerator from the rest of the shop without any physical barriers. It is a pretty cool system and can be quite efficient. Although not as efficient as an actual physical barrier. A shop may install transparent doors or flaps to save energy. And during night they often cover the refrigerators to make them more efficient.