Multiple-effectevaporation can be classified as a variable hot and cold sink system. The minimum utility of this kind of system must bet he case where multiple pinch points occur.
多效蒸发系统属于可变冷、热源系统，此类系统在出现多狭点时达到最小外界供热和取热。
2
In respect of the producing method, refined and high unmixed salt is usually made by multipleeffectevaporation in vacuum, when man-made bittern is needed.