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Standard Dry Cooler (STK)A Variable System Sturdy GEA standard dry coolers are reliable air coolers. Modularization allows customization exactly for project requirements. The cooler is limited to what is really needed and still remains a highly flexible system.
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Standard Dry Cooler
- Designed according to: AD-Merkblatt, PED, DGRL
- Finned Tube:
Steel (German grade St. 37.0 and others) elliptical tube, welded, 1,5 mm average wall thickness, hot-dip galvanized with fins, sturdy, resistant to corrosion, designed for optimized heat transfer, fit for 500 bar lancing to avoid loss of cooling capacity as a result of airside fouling. - Headers:
Steel (German grade WSTE 355 and other) bonnet-type headers, welded to tube sheets, fit for a maximum of 20 bar and 200 °C - Steel structure galvanized, resistant to corrosion
- Fans: external-rotor motor, IP54, two speeds
- Shipment: preassembly at factory
Standard Dry Cooler Design Alternatives and Accessories
- Seamless core tube with 1.8 mm wall thickness
- Tubes (German grade St. 35.8 or other) fit for temperatures up to 350 °C with additional special heat treatment
- Two-pass welds
- Tube end degalvanized before welding
- Turbulators for highly viscous products
- 15 % inclined tubing (condenser mode)
- Fans driven by standard motors
- Speed or step fan control as a function of product temperature
- Louvers to prevent freezing
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In Principal GEA standard dry coolers use ambient air to cool fluids. They are particularly cost efficient when they are employed for cooling and condensation, benefiting fully from the temperature difference between the two fluids.
 
The fans needed to move the cooling air are driven by two-speed motors. At low temperature or during night-time, the low fan speed reduces noise emissions and cuts power consumption.
To satisfy different noise regulations, standard dry coolers have been developed for four different noise classes from “normal” (N) to “extremely quiet” (E). Costs of dry collers of different noise ratings
Cost Efficient All Round
As the figure shows, the most quiet units may, because of the limited air flow requirements, reduce power consumption and thus operating expenses to a level where they are more cost efficient in spite of the higher capital outlay. When combined with refrigerant systems or forced cooling systems, standard dry coolers are a good choice even for processes where a product must be cooled far below ambient temperature. The following figure shows the part of the cooling load provided by each cooling system as a function of outdoor temperature and product temperature. 
Air cooling even cost efficient in applications
such as water chilling, when backed up by
refrigerant or forced cooling systems
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