The high quality air cooler consists of 3 parts of the tube bundle, fan and frame. The tube bundle comprises a heat transfer pipe, a pipe box, a side beam and a crossbeam. It can be arranged in 3 basic forms by horizontal, vertical and oblique top (herringbone type). Among them, the horizontal arrangement heat transfer area is big, the air distributes evenly, the heat transfer effect is good, when the slanting top arranges, the ventilator installs in the human character central space, occupies the area small, the structure is compact. In order to counteract the effect of low heat-transfer coefficient on the air side, tubes with finned tubes on outer wall of light tube are usually used. As a heat transfer tube, the finned tube can enlarge the heat transfer area. The finned tube is arranged in a stratified manner, and the ends are connected with a welding or expansion method to the Tube box. Pipes are generally $number rows. Tube Bundle Series Size up to 12 meters. The outer diameter of the light tube is usually 25 mm and 38 mm, and the fin height is generally $number mm and the bundle width is 100~3000 mm. finned tube is the core element of air cooler, and its form and material directly affect equipment performance. The pipe can be made of carbon steel, copper, aluminum and stainless steel, and the fin material is determined by the use of the environment and manufacturing process, most of which is made of industrial pure aluminum, which is high in corrosion resistance or in the case of special conditions in the manufacturing process. Fins can be arranged horizontally or vertically. The basic forms of finned tube are: wound-type, insert-type, rolling-chip type, chip-type, welding-chip, elliptical tube-type, turbulence-type (including spoke-type, slotted-shaped and corrugated-shape, etc.). The main structure of the Tube box is flange type, pipe plugging type and assembly pipe type. In general, the former is used for medium and low pressure. In order to adapt to the thermal expansion of tube bundles, one end of the tube is not fixed, allowing long direction displacement along the tube. Fan usually adopts axial fan.