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Generally it will strengthen the heat transfer outside piping by the means of the ambient air as the cooling medium and by heat transfer area entended relying on the fin tube, as well as take away heat by air temperature rise after the air across the fin tube to achieve the purpose of cooling, condensing the heat fluid inside the pipe.

Air will be available to acquire as a cooling medium; when the dry air cooler is used, the plant selection is basically not limited by water source; air corrosion is low, special scaling measures shall be unneccessary,the operation cost is low due to air cooling pressure reduction; air cooling system maintenance cost is low, which is generally 20% ~ 30% of water cooling; and the environmental pollution is also low.

Generally it is used in the occasion where the terminal temperature of medium shall be higher than the environment design temperature 10-15 ℃ or more.

As a supplementary means of dry air cooling, external dry-type air cooler shall be equipped with spray facility to achieve the purpose of reducing the air side temperature so as to increase the temperature difference between the air inlet temperature and the outlet temperature of the hot fluid in the pipe to strengthen heat transfer.

Medium temperature could be reduced to the value that is higher than atmospheric humid bulb temperature around 5 ℃ or so.

It is generally used for the equipment with the lower inlet temperature of the medium  (basically below 70 ℃) as well as outlet temperature of the medium is close to the evironment dry bulb so as to increase the temperature difference between air inlet temperature and the outlet temperature of the hot fluid in the piping for strengthing heat transfer

It is the combination of dry and humid air cooler, the structure would be a variety of changes due to different methods for combination, the structure of a variety of changes. Generally, dry air cooling would be used in the high temperature area of process fluid, and the humid air cooling would be used in the low temperature of area.

It can not only solve the condensation and cooling of high temperature at the inlet (dry type), but also meet the requirement of lower temperature at the outlet (humid type), which combines all the characteristics of the dry and humidt - type.

It would be usually used in the case that humid air cooler would not be available by single itself due to the inlet temperature is too high .

Surface evaporative air cooler is refer to spraying the soft water to the outer surface of heat exchange tube by spray facilities inside equipment to form a continuous uniform thin water film, the evaporation of water film would make air through bear tube to increase humidity for approaching saturation which after that shall be extracted and evacuated into the ambient air by induced draft - axial flow fan ;

It has many advantages such as high efficiency for heat transfer, good cooling effect, small heat transfer area required,compacted structure; low energy and water consumption, low operation cost;low investment cost, small occupied area; flexible operation and good operability.

It is suitable for condensering and cooling of industries such as oil and gas on the top of various towers, cooling of oil products, cooling between compressor stages, power, metallurgy, cooling water and steam as well as refrigerant etc. in refinery and chemical industry and for cooling closed circuit circulation of other process.

⑴Hot - Wind Inner Circulation - Air Cooler

Common air cooler shall be equipped with plenum for the upper by adjusting fan for positive and negative rotation to achieve the structure type of hot wind recirculation of inner equipment.

The area of cover is smaller and nearly the same as the volumn of common air cooler and arranged in parallel.

It would be used in the case where the condensation or crystallization would be likely to happen by the refrigerated medium under the lowest design temperature, including the those in which the moisture content is more than 10% in the medium; the occasion in which the control requirements of medium terminal temperature (more than + / - 5 ℃) is less precise;special structure and investment shall not be increased by using fan reversal regulation; the air cooler that has no less than two of fans.

 ⑵Hot - Wind Outer Circulation - Air Cooler

The air chamber would be equipped on the upper part of the general air cooler, and the ventilation channel would be added on the side or end face of the frame to recycle the hot air discharged from the pipe bundle through the channel.

The control precision is high,which would play a good role in the stable operation of some devices that are likely to happen condensation or crystallization precipitation, and large medium viscosity and require to maintain the temperature in the pipe.

It would be used in the occasion in which would be likely to happen condensation or crystallization precipitation by cold medium in the lowest design temperature,including those in which the moisture content is more than 50% in the medium;the occation in which control requirements of medium thermal temperature is higher (+ / - 3 ℃ or less);In addition to the use of self-regulating fan, automatic (or manual) shutters and external circulation duct would be required; Sometimes steam heating coils are required.