Air Cooled Heat Exchangers

 

What is it?

Air cooled heat exchangers (ACHE) are used to reduce the process fluid temperature by transferring the heat from process fluid into the ambient air.
 
ACHE are commonly used in industrial applications where a reliable source of water is not available as a cooling medium. Even if water is available, in some cases, air cooled exchangers are favored for economic or operational reasons – because dedicated cooling water circuits, pumps, water cooling systems and water conditioning systems add complexity and capital requirements, as well as operating and maintenance costs.
 
Air Cooled Heat Exchangers
 
ACHE are used throughout the entire oil & gas industry from upstream production to refineries and petrochemical plants, under conditions including high pressure and temperature, as well as corrosive fluids and environments. Common applications include gas re-injection, gas lift and pipeline applications, cooling and condensing of hydrocarbon gases, and cooling of machinery oil and heavy hydrocarbons. Air cooled steam condensers are a special type of heat exchanger employed to condense steam at the exhaust end of steam turbines for both power generation and mechanical drive applications.
 
Air Cooled Heat Exchangers
 
 
Air Cooled Heat Exchangers  

Regulations governing water use and discharge of effluent streams to the environment also tend to favor air cooling.

Although the capital cost of an air-cooled exchanger is generally higher, the operating cost is usually significantly lower compared with a water-cooled exchanger. Hence, high energy cost relative to capital cost favors air cooling.
 
Air cooling also eliminates the fouling and corrosion problems associated with cooling water, and there is no possibility of leakage and mixing of water with the process fluid. Thus, maintenance costs are generally lower for air-cooled exchangers. Atmospheric air, which serves as the coolant, is caused to flow perpendicularly across the tubes in order to remove heat. In a typical air cooled heat exchanger, the ambient air is either forced or induced by a fan or fans to flow vertically across a horizontal section of tubes. For condensing applications, the bundle may be sloped or vertical. Similarly, for relatively small air cooled heat exchanger, the air flow may be horizontal across vertical tube bundles.
 
In order to improve the heat transfer characteristic of air cooled exchanger, the tubes are provided with external fins. These fins can result in a substantial increase in heat transfer surface. Parameters such as bundle length, width and number of tubes rows vary with the particular application as well as the particular finned tube design.
 
Atmospheric air (having temperature varying from 20 to 45[°C], depending on season) can be used as cooling medium if the process fluid is to be cooled up to 60[°C]. If it is to be cooled below 60C, then atmospheric air cannot be used as a cooling medium, as minimum driving force required for heat transfer in air cooled heat exchanger is 10[°C].
 
 
   

How it Works

 
The hot process fluid to be cooled flows through a tube while the cooling air flows across the outer surface to remove heat. The cooling air is propelled by fans in either a forced draft or induced draft configuration. Specially designed fins are attached to the outer surface of the tube to create a large surface area for more effective cooling. The heat transfer rate is a function of the fins’ surface area and the velocity of the air flow.  
   
The mechanical design of the exchanger must accommodate the process conditions including pressure and temperature and, possibly, corrosivity, fouling and condensation. Dynac produces various configurations to meet all these conditions. The key to quality and long service life is the proper selection of materials and fabrication technology, not the least of which is advanced welding capabilities. Large exchangers can include thousands of tubes so it is crucial to maintain dimensional stability and weld integrity.  
 
   

Air-Cooled Heat Exchangers (ACHE)

Cools circulating fluid within finned tubes by forcing ambient air over the exterior of the tubes.

Total Solution Provider

Manufacturing of components are done in house   Involved in the market since 2001
     
Cater all client requirements from new complete package to repairs   Design, fabrication, testing and commissioning of ACHE
 

Types of ACHE

 
  • Forced Draft
  • Natural Draft
 
  • Induced Draft

Type of Headers

 
  • Plug Header
 
  • Cover & Flange Header

Finned Tubes

 
  • Made of aluminium alloy SB209 A1060
  • Types include L, LL, extruded and G-Fin
 
  • Size ranging from 1” to 1.5”
  • Length up to 15m

Strength

 
  • Complete all in one supplier and manufacturer of ACHE
     
  • Over 10 years experiences of supply and manufacture of ACHE
  • Over 30 years combined experience of key personnel on ACHE manufacturing
 
  • Over 6,000 m2 covered and 20,000 m2 uncovered area at our Pasir Gudang facility.
  • Built to purpose and well equipped manufacturing facilities
  • Experience manufacturing team with proven manufacturing techniques and tools
 

Shell & Tube Heat Exchangers

A shell and tube heat exchanger is the most common type of heat exchanger in all Industries. Mostly used in higher- pressure and Higher Temperature applications.
 
These types of Heat exchangers are having two divisions one is shell and other is Tubes. Here One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids. For this purpose, seamless or Rolled pipes are used for shell. And Seamless tubes are used for Tubes.
 
Shell & Tube Heat Exchangers   Shell & Tube Heat Exchangers   Shell & Tube Heat Exchangers
 
Our Shell and Tube Heat Exchangers Design Process Contains Two Parts - Thermal (using HTRI Software) and Mechanical Design (using PV Elite).
 
 
PLO 110 Jalan Nibong 3, Tanjung Langsat Ind. Estate Pasir Gudang, 81707 Johor Darul Takzim, Malaysia.
+607-259 9888   +607-259 9988   info@dynac.com.my
 
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