air cooled heat exchanger Archives - UNITED HEAT EXCHANGER

Water Cooling Tower

By | Cooling Tower | No Comments

Water Cooling Tower – Cooling Water Systems are an essential part of process operations for many industries and public buildings. There are four problems commonly associated with water systems; corrosion, scale, fouling and microbiological contamination.

Clearwater products have been specifically designed to optimise system performance, cleanliness and heat exchange efficiency. Clearwater is the acknowledged leader in stable halogen treatment technology.

Regulatory requirements (ACOP L8) specify that cooling towers need to be controlled in order to prevent the proliferation of legionella bacteria. Legionnaires disease has become a major health and safety issue. Clearwater have the knowledge and experience to ensure that our clients comply with Government legislation

Water Cooling Tower

Natural Draft Cooling Tower

By | Cooling Tower | No Comments

“Natural Draft Cooling Tower” Natural contacts ambient air rising up through the tower either by forced draft using large fans in the tower. Natural draft is utilizes a tall chimney. Warm, moist air naturally rises due to the density differential compared to the dry, cooler outside air. Warm moist air is less dense than drier air at the same pressure.

This moist air buoyancy produces an upwards, current of air through the tower.Natural that appears like a natural draft setup, though airflow is assisted by a fan.This association is misleading, as the same kind of cooling towers are often used at large coal-fired power plants as well. Conversely, not all nuclear power plants have cooling towers, and some instead cool their heat exchangers with lake, river or ocean water.

The heat required to evaporate the water is derived from the water itself, which cools the water back to the original basin water temperature and the water is then ready to recirculate. Natural cooling towers have become the design standard for all natural-draft cooling towers because of their structural strength and minimum usage of material. The hyperboloid shape also aids in accelerating the upward convective air flow, improving cooling efficiency. These designs are popularly associated with nuclear power plants. That contact causes a small amount of the water to be lost as windage (W) and some of the water to evaporate.

Natural Draft Cooling Tower

Air cooled heat exchanger Manufacturers

Air cooled Heat Exchanger

By | Heat Exchanger | No Comments
air cooled heat exchanger

air cooled heat exchanger

Air-cooled heat exchangers are generally used where a process system generates heat which must be removed, but for which there is no local use. A good example is the radiator in your car. The engine components must be cooled to keep them from overheating due to friction and the combustion process. The excess heat is carried away by the water/glycol coolant mixture. A small amount of the excess heat may be used by the car’s radiator to heat the interior. Most of the heat must be dissipated somehow. One of the simplest ways is to use the ambient air. Air-cooled heat exchangers (often simply called air-coolers) do not require any cooling water from a cooling tower. They are usually used when the outlet temperature is more than about 20 deg. F above the maximum expected ambient air temperature. They can be used with closer approach temperatures, but often become expensive compared to a combination of a cooling tower and a water-cooled exchanger.


Air Cooled Heat Exchanger Manufacturers

Air Cooled Heat Exchanger


Typically, an air-cooled exchanger for process use consists of a finned-tube bundle with rectangular box headers on both ends of the tubes. Cooling air is provided by one or more fans. Usually, the air blows upwards through a horizontal tube bundle. The fans can be either forced or induced draft, depending on whether the air is pushed or pulled through the tube bundle. The space between the fan(s) and the tube bundle is enclosed by a plenum chamber which directs the air. The whole assembly is usually mounted on legs or a piperack.


The fans are usually driven be electric motors through some type of speed reducer. The speed reducers are usually either V-belts, HTD drives, or right angle gears. The fan drive assembly is supported by a steel mechanical drive support system. They usually include a vibration switch on each fan to automatically shut down a fan which has become imbalanced for some reason


The air-cooled heat exchangers are mostly used when the plant location and the ambient conditions do not allow an easy and economic use of other cooling systems.


Specifications :

  • Lower environmental impact than shell and tube heat exchangers thanks to the elimination of an auxiliary water supply

Applications :

  • Reduction of maintenance costs
  • No problem arising from thermal and chemical pollution of cooling fluids

Advantages :

  • Easy installation by bolted assembly
  • Flexibility for any plant location and plot plan arrangement(installation over other units)

Air cooled heat exchanger