无管道微型分体热泵在亚洲广泛使用，但到目前为止在美国的市场份额相对较小，仅占供暖和制冷系统安装的5%左右。考虑到与传统空气源热泵相比的一些关键优势，这种情况可能会改变。两种系统的工作原理相同。最大的区别在于空调的分配方式。对于传统的空气源热泵，一个室外冷凝器/压缩机提供一个中央室内蒸发器/空气处理加压制冷剂。空调空气通过管道吹到各个房间。在无管道系统中，室外机通过一根小直径的管道向多达8个独立的室内机提供制冷剂。没有管道。每个室内单元都可以单独控制，这使得管理房屋不同部位的供暖和制冷相对简单。最著名的系统之一是三菱(Mitsubishi)生产的“斯利姆先生”(Mr. Slim)系统，但无管微裂系统是由富士通(Fujitsu)、LG、Frigidaire、弗里德里希(Friedrich)、伦诺克斯(Lennox)等多家公司生产的。 Ductless minisplits often are promoted primarily as an easy way of adding air conditioning to homes without ductwork.This is true, but they also can provide heat. They are an increasingly popular choice for high-efficiency houses with low heating loads. Advantages of going ductless Eliminating the need for ducts saves money, and a ductless system also is less disruptive during a renovation. In a ductless system, a 3-inch-diameter conduit provides enough room for the refrigerant piping, control wires and a drain for condensate. A simple system that includes an outdoor unit and a few indoor heads can be installed quickly, with little of the construction headaches associated with a conventional system. Ducts also are inherently wasteful.…