封建时代的皇家宫廷,其避暑方式十分奢侈。唐代时,皇帝在宫廷中建有专供避暑的凉殿,殿中安装了机械传动的制冷设备。这种设备采用冷水循环的方法,用扇轮转摇,产生风力将冷气送入殿中。同时,还利用机械将冷水送向屋顶,形成人造水帘,以达到消暑之目的。在宋代帝王的凉殿中,也有这种设备,但比起唐朝 Royal court feudal era, the summer is very luxurious way. Tang Dynasty, the emperor built in the court specifically for the summer heat of the temple, the hall installed mechanical transmission of refrigeration equipment. This equipment uses a method of cold water circulation, with fan wheel rotation, the wind will be sent to the hall of cold air. At the same time, also use the mechanical cold water to the roof, the formation of artificial curtain, in order to achieve the purpose of refreshing. In the imperial temple in Song Dynasty, there is such a device, but compared to the Tang Dynasty