Air Cooled Heat Exchanger Manufacturers in India
United Heat Exchangers designs and manufactures high-performance air cooled heat exchangers — also called air fin coolers or fin fan coolers — for rejecting heat from hot process fluids to the atmosphere using only ambient air as the cooling medium. No water required.
Air Cooled Heat Exchangers (Fin Fan Coolers / Air Fin Coolers) — What They Are
Air Cooled Heat Exchangers, Fin Fan Coolers, Air Fin Coolers, Coil Coolers, and Dry Cooling Towers all refer to the same category of air cooling equipment. These names are used interchangeably across different industries and regions of the world — all describe a finned tube heat exchanger that uses atmospheric air, driven by axial flow fans, to cool a hot process fluid without consuming water.
An air cooled heat exchanger transfers heat from a hot process fluid flowing inside finned tubes to atmospheric cooling air flowing across the outside of the fin surface. The extended fin surface dramatically increases the effective heat transfer area per unit of tube length, enabling efficient heat rejection to the ambient air even at modest temperature differences. The result is an economical, low-running-cost cooling solution that eliminates the need for a cooling water supply, water treatment chemicals, or a separate cooling tower circuit.
In principle, air cooled heat exchangers are the industrial equivalent of automotive radiators — but engineered for high-pressure, high-temperature process duty in oil refineries, gas plants, petrochemical facilities and power stations.
Design & Construction
Air fin coolers are designed with multiple rows of finned tubes arranged in a series of surfaces — the tube bundle. The required number of axial flow fans are positioned to move low-temperature ambient air over the finned tube surface, cooling the hotter process fluid inside the tubes. The finned tube bundle modules are of modular construction for straightforward transportation and site assembly.
Header Types
The header — which distributes and collects process fluid at each end of the tube bundle — is available in several configurations to suit process pressure, temperature and maintenance requirements:
- Welded Bonnet Header
- Plug Header
- Manifold Header
- Plug and Pipe Header
Fin Types
The choice of fin type affects heat transfer efficiency, material suitability and cost. United Heat Exchangers manufactures air cooled heat exchangers with all standard fin configurations:
- 'L' Type Wrap-On Fins
- 'G' Type Embedded Fins
- Bi-metallic Extruded Fins
- Wire / Strip Type Copper Wound / Knurled Fins
Products We Manufacture in This Division
- Process Coolers
- Compressor Coolers
- Radiator Coolers
- Economizers
- Coil Coolers
- Auxiliary Coolers
- Finned Tube Coolers
- Tube Bundles
- Fin to Air Coolers
- Air Blast Oil Coolers
Suitable for all process industries, gensets, furnaces, oil and gas, refinery, petrochemical and power plants.
Key Features & Benefits
- No cooling water required — eliminates water treatment costs and water scarcity risk
- Capable of high-pressure and high-temperature process duty with corrosion-resistant metallurgy
- Modular finned tube bundle construction for easy transport and installation
- Multiple fin types and header configurations to suit any process requirement
- Economy in running costs — atmospheric air is free and always available
- ASME coded and ISO 9001:2015 certified manufacturing
Technical Specifications
| Parameter | Details |
|---|---|
| Process Side (Tube) | Any fluid: hydrocarbon gases, oils, water, steam, acids, solvents |
| Cooling Medium | Atmospheric air — axial flow forced or induced draft fans |
| Pressure Rating | High-pressure capability; as per ASME design requirements |
| Temperature Range | High-temperature applications; metallurgy specified for corrosive media |
| Tube Materials | Carbon steel, stainless steel, copper, aluminium, high alloy as required |
| Fin Materials | Aluminium, carbon steel, stainless steel, copper |
| Fin Types | 'L' Wrap-On, 'G' Embedded, Bi-metallic Extruded, Wire/Strip Wound |
| Header Types | Welded Bonnet, Plug, Manifold, Plug and Pipe |
| Fan Type | Axial flow; forced draft or induced draft; belt or direct drive |
| Design Standards | ASME, API 661 as applicable; ISO 9001:2015 quality assurance |
Air Cooled Heat Exchanger Gallery
Types of Air Cooled Heat Exchangers We Manufacture
We design and supply air cooled heat exchangers in multiple configurations — fan arrangement, airflow direction and construction — to suit every process industry requirement.
Forced Draft
Axial flow fans are positioned below the tube bundle and push ambient air upward through the fin surface. The standard configuration for most process cooler applications. Offers uniform airflow distribution, easy fan maintenance access, and lower power consumption. Air enters cool at the fan and exits hot at the top, reducing the effect of hot air recirculation.
Induced Draft
Fans are mounted above the tube bundle and draw air upward through the fin surface. Because the fans handle warm exit air, they operate at lower efficiency than forced draft units, but the configuration provides better protection of the process fluid from ambient temperature spikes and offers more uniform air distribution across the bundle face.
Air Blast Oil Cooler
A compact, self-contained air cooled heat exchanger specifically designed for cooling lubricating oil, hydraulic oil and transformer oil in applications where cooling water is unavailable. Available in flat fin & tube and finned coil construction. Mounted directly on machinery or as a standalone unit. Suitable for gensets, compressors, hydraulic power packs and industrial machinery.
Fin Technologies for Maximum Heat Transfer
The fin type determines heat transfer efficiency, material compatibility, and suitability for different process temperatures and environments.
'L' Type Wrap-On Fins
Aluminium strip is formed into an 'L' shape and wound tightly onto the tube under tension. The foot of the 'L' lies flat on the tube, providing a large contact area and good heat transfer. Cost-effective and widely used for moderate temperature duties up to approximately 180°C. Suitable for carbon steel, stainless steel and aluminium tubes.
'G' Type Embedded Fins
A groove is machined into the tube surface and an aluminium fin strip is wound into and over the groove, then crimped to lock it in place. This intimate mechanical contact minimises fin-to-tube thermal resistance and maintains performance even at high operating temperatures. Preferred for high-temperature process duty and situations where thermal cycling could cause 'L' fin lifting.
Bi-Metallic Extruded Fins
An aluminium outer tube is extruded over a steel inner tube, and fins are formed by machining the aluminium outer layer. The bi-metallic construction combines the excellent thermal conductivity and light weight of aluminium fins with the strength and pressure-holding capability of the steel inner tube. Zero fin-to-tube contact resistance — used in demanding applications where reliability over decades is critical.
Applications of Air Cooled Heat Exchangers
All types of process fluids across all major industries are cooled in air fin coolers using atmospheric air as the cooling medium, resulting in economy in running costs and elimination of water use.
Oil, Gas & Petrochemicals
Cooling of hydrocarbon gases, process oils, amine solutions and other corrosive or flammable fluids at high pressure in upstream gas processing, refineries and petrochemical plants.
Power Generation
Cooling of turbine lube oil, generator hydrogen coolers, compressor inter- and after-coolers and condenser duty in gas and steam power plants and captive power stations.
Compressors & Gensets
Air and gas compressor inter-coolers, after-coolers and oil coolers. Diesel generator radiator coolers and engine jacket water coolers for generator sets in industrial and power utility applications.
Furnaces & Steel Plants
Furnace cooling water systems, hydraulic equipment cooling and waste heat recovery in steel, sponge iron and cement manufacturing where water conservation is essential.
Pharma & Chemicals
Cooling of solvents, acids, specialty chemicals and pharmaceutical intermediates in batch and continuous process plants requiring corrosion-resistant metallurgy and clean, water-free cooling.
Condensation & Other Process
Air cooled condensers for steam and solvent vapour, gas coolers for nitrogen, CO₂ and other non-flammable gases, and general-purpose process cooling across sugar, food, textile and other industries.
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