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Air-Cooled Heat ExchangersGEA offers a range of different air-cooled heat exchanger configurations in order to meet the specific requirements of both the process and the site location.
Whatever the configuration, one of the most important design criteria is to ensure that air is allowed to freely enter and leave the system, ensuring maximum heat transfer. Air-Cooled Heat Exchanger Design Considerations:| Fan / Tube Bundle Arrangement |
Induced draft:
The Induced draft unit gives a steady and durable thermal performance due to the protection of the finned surface against wind, rain, hail and snow by the plenum chamber. The induced draft also ensures a better air distribution, less hot air recirculation, less air-side fouling and lower noise levels at grade. |  | Forced draft:
The forced draft unit allows an easy access for maintenance to the fans and to the bundles. Furthermore, the fans remain in the cold ambient air. |  |
| Fan blades are generally made of either aluminium or glass reinforced plastic (GRP). The number and the rotational speed of the blades depends on the air-flow and noise requirements. Different kinds of belt drive systems are used depending on the transmission power and client preferences. The different belts used are v-belts, integral v-belts and toothed high torque drive (HTD) belts. For higher powered systems (over 37 kW), gear drives (parallel shaft or right angle) are preferred. Electric motors are generally used as drivers, but steam or hydraulic turbines as well as low speed direct drive electric motors can also be used. Air-flow control can be realised using either manual or automatic variable pitch fans or variable speed electric drives (variable frequency). |
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