Open-type ceiling refrigeration system

An open-type ceiling refrigeration system, comprising:

• a ceiling;
• an evaporation pipe fixedly connected to the ceiling and slantly arranged, an input end of the evaporation pipe being higher than an output end of the evaporation pipe;
• a water inlet pipe disposed outside the ceiling, an output end of the water inlet pipe being connected to the input end of the evaporation pipe, and the water inlet pipe being connected to a three-way valve;
• and
• a water removal assembly disposed outside the ceiling and below the evaporation pipe, the water removal assembly comprising a water sealing cavity, the output end of the evaporation pipe being connected to the water sealing cavity by means of a recovery pipe, the water sealing cavity being connected to a first pipeline extending upwards and communicated with the input end of the evaporation pipe, a lower end of the first pipeline being connected to a molecular sieve configured for limiting water vapor from passing through, and the water removal assembly being configured for absorbing the water vapor.