70年代后期到80年代，为了降温隔尘，我矿在露天采矿设备的司机室内安装了CKT－3B型和BLK—3000C型窗式空调器和508型冷风机。近年来，制冷和空调设备已在露天矿山得到了广泛应从1986年至u1997年起，507与508型冷风机的制冷方式全部采用了蒸汽压缩机，由于制冷机的动力直接来源 From the late 1970s to the 1980s, in order to cool the dust, the mine installed the CKT-3B and BLK-3000C window air conditioners and the 508 chiller in the driver’s cab of the open pit mining equipment. In recent years, refrigeration and air-conditioning equipment has been widely used in open-pit mines. From 1986 to the beginning of the year u1997, the 507 and 508-type chillers were all equipped with steam compressors. Because of the direct source of chiller power