Cooler air cooler for short, also can call air cooled heat exchanger, it with ambient air as a heat transfer medium, relying on the finned tube as enhancing heat transfer in pipe outside air can, under the effect of heat conduction, is passed to the finned tube medium heat, repass fan forced circulation, the air horizontal finned tube controls take away heat, to reach the purpose of cooling condenser tube medium. It is a very important process equipment in oil refining, chemical industry and modern process technology. The level of its heat transfer ability directly limits other capacity, so its research and development has always been paid attention to, generally from planning, manufacturing structure to improve its heat transfer mechanism.This paper takes a simple dry air cooler as an example, and does not plan wet air cooler and dry and wet combined air cooler temporarily. Optimization is generally considered from three aspects;

1; Selection of fin type

Because different process conditions allow different materials, the optional fin type, its heat exchange function is very different. The same fin control, the heat exchange area can be separated by about 30-50%, to steel and aluminum composite fin tube for example, the selection of 25*2.5-57/2.3/0.3 fin tube, the heat exchange area can reach 1.65 square/m, and 25*2.5/50/3.0/0.35 steel and aluminum composite fin tube, the heat exchange area is only 1.09 square. When there is a large gap between the heat transfer coefficient of the inner tube and the heat transfer west of the outer tube, the type of high fin should be considered. In some cases, hydrophilic aluminum foil copper tube string sheet fin form can be selected, its unit heat transfer area is larger, heat transfer ability is higher. It is not surprising that coolers made of such fins are cost-effective.

2; Reasonable heat transfer area calculation and customized conditions

Each working condition is not the same, the same operation process using different address, the influence of climate conditions are not the same. We advocate non-standard customization, in order to meet the most reasonable heat exchange demand, meet the local worst working environment equipment function can still reach the standard as the benchmark. At present, many users choose standard series, which is not impossible, but if the equipment parameters are far greater than the planning requirements, it is not desirable. For example, an 800 square cooler can meet the target requirements, must choose 2000 square air cooler. Equipment investment is too big not to say, the usual operation cost is also a great waste, over the years the total operation cost is too high on the enterprise is also a great burden.

3; Functional structure

It is known that the primary power loss of the cooler lies in the power consumption of the fan and the pumping system, so the lower wind pressure should be selected as far as possible under the condition that the air volume requirements of the satisfactory process conditions are allowed. From the operation requirements of the fan, large flow and high wind pressure is bound to consume more power, so reasonable selection of the relationship between the fan air volume and wind pressure is also very important for the cooler. The medium in the tube is the same, the first thing should be satisfied with the medium in the tube has always been in a strong turbulent condition, so that the Reynolds number is at a reasonable level, improve the heat transfer ability of the fin tube, so that the heat exchange function of the cooler can always play an excellent role. Years of planning results show that in fact, the pressure loss caused by medium flow in the cooler tube is not a big problem and can be reduced by various methods. However, many enterprises neglect the rationality of the diameter of the import and export pipeline when planning the cooler, and the loss of water side pressure costs more. The problem can be solved by adjusting the pipe flange diameter.