Principle and composition of air cooler

An air cooler is a device that uses air as the cooling medium to cool or condense the process medium to the required temperature.

The air cooler is mainly composed of five basic components: tube bundle, fan, frame, shutter and ladder platform.

Tube bundle is the basic part of heat transfer, which is composed of finned tube (or light tube), tube box, side beam and support beam to form a whole. When the cooled or condensed medium passes through the tube, its heat is taken away by the flowing air, and the medium in the tube is cooled or condensed.

The fan is used to drive the air through the tube bundle, taking away the heat of the cooled medium.

The frame consists of a steel structure frame and air duct, through which the tube bundle and the fan are supported, and the air flows in a certain direction.

Shutters are used to control the direction of air flow or the size of the flow, while protecting the finned tube.

The ladder platform is convenient for the operation and maintenance of the air cooler.

According to the ventilation mode, the air cooler is divided into: blast type, induced air type, natural ventilation type.

According to the arrangement of the tube bundle, the air cooler is divided into horizontal type, vertical type and inclined top type.

According to the cooling method, the air cooler is divided into dry type, wet type, dry and wet combined type.

Air cooler features

The advantages and disadvantages of air cooling compared to traditional industrial cooling systems with water as the cooling medium are shown in Table 1. It can be seen from the table that air coolers are suitable for use in water-scarce areas or water-cooled areas with serious scaling and corrosion. Generally, it is more advantageous to use air cooling under the following conditions.

(1) The difference between the thermal fluid outlet temperature and the air inlet temperature is >15℃.

(2) The thermal fluid outlet temperature is >55 ° C, and its allowable fluctuation range is >5 ° C.

(3) The design air temperature is <38℃.

(4) Effective logarithmic mean temperature difference ≥40℃.

(5) The heat transfer coefficient of the hot fluid in the tube is <2300W/(m2 *℃).

(6) The freezing point of the hot fluid is <0℃.

(7) The allowable pressure drop of the hot fluid on the tube side is >10kPa, and the design pressure is >100kPa.

Principle and composition of air cooler

An air cooler is a device that uses air as the cooling medium to cool or condense the process medium to the required temperature.

The air cooler is mainly composed of five basic components: tube bundle, fan, frame, shutter and ladder platform.

Tube bundle is the basic part of heat transfer, which is composed of finned tube (or light tube), tube box, side beam and support beam to form a whole. When the cooled or condensed medium passes through the tube, its heat is taken away by the flowing air, and the medium in the tube is cooled or condensed.

The fan is used to drive the air through the tube bundle, taking away the heat of the cooled medium.

The frame consists of a steel structure frame and air duct, through which the tube bundle and the fan are supported, and the air flows in a certain direction.

Shutters are used to control the direction of air flow or the size of the flow, while protecting the finned tube.

The ladder platform is convenient for the operation and maintenance of the air cooler.

According to the ventilation mode, the air cooler is divided into: blast type, induced air type, natural ventilation type.

According to the arrangement of the tube bundle, the air cooler is divided into horizontal type, vertical type and inclined top type.

According to the cooling method, the air cooler is divided into dry type, wet type, dry and wet combined type.

Air cooler features

The advantages and disadvantages of air cooling compared to traditional industrial cooling systems with water as the cooling medium are shown in Table 1. It can be seen from the table that air coolers are suitable for use in water-scarce areas or water-cooled areas with serious scaling and corrosion. Generally, it is more advantageous to use air cooling under the following conditions.

(1) The difference between the thermal fluid outlet temperature and the air inlet temperature is >15℃.

(2) The thermal fluid outlet temperature is >55 ° C, and its allowable fluctuation range is >5 ° C.

(3) The design air temperature is <38℃.

(4) Effective logarithmic mean temperature difference ≥40℃.

(5) The heat transfer coefficient of the hot fluid in the tube is <2300W/(m2 *℃).

(6) The freezing point of the hot fluid is <0℃.

(7) The allowable pressure drop of the hot fluid on the tube side is >10kPa, and the design pressure is >100kPa.