Why does the air-conditioner condenser have wrinkles?

Have you ever noticed the condenser of an air-conditioner? It has a lot of wrinkles, and this is not for appearance but for practical reasons.

The main job of the condenser is to turn gaseous refrigerant into liquid. During this process, a large amount of heat needs to be dissipated. The wrinkled design can greatly increase the surface area of the condenser. It's like unfolding a flat plate into a piece of paper with many folds, which can come into contact with more air. In this way, the heat emitted by the refrigerant can be transferred to the air more quickly and efficiently, thus improving the heat-dissipation efficiency. If the condenser were smooth, the amount of air it could contact would be less, and the heat-dissipation would be slow, which would significantly reduce the air-conditioner's cooling effect. Moreover, the wrinkled design can also enhance the structural strength of the condenser to a certain extent, making it more durable. So, these wrinkles are actually the little secret weapons that make the air-conditioner work efficiently!