compressed air is directly cooled by a refrigerant in a heat exchanger, an indirect cooling-type air dryer enables the cooling and dehumidification of compressed air through an intermediate heating medium.
GSA’s compressed air dryer is highly reliable and efficient in use
Indirect Cooling-type Air Dryer
Unlike a direct cooling system in which compressed air is directly cooled by a refrigerant in a heat exchanger, an indirect cooling-type air dryer enables the cooling and dehumidification of compressed air through an intermediate heating medium. For the intermediate heating medium, cooling water such as brine is commonly used.
A conventional direct cooling system consists of two different heat exchangers such as air-to-air heat exchanger and an air-to-REF heat exchanger. In contrast, an indirect cooling air dryer is comprised of three heat exchangers: air-to-air, heating medium-to-REF and heating medium-to-air heat exchangers. A coolant fluid used as a heating medium is usually high in heat capacity and specific heat. As a result, it ensures
more stable dew points in certain circumstances such as rapid increase in load compared with a direct cooling method.
| Direct Cooling | Indirect Cooling | |
|---|---|---|
| Heat Exchanger | Air to Air | Air to Air |
| Air to Ref | Cooling medium to Ref. | |
| - | Cooling medium to Ref. | |
| System Configuration | Relatively simple | Complicated |
| Application | Good for small-medium size | Good for large size |
| Dew Point | Relatively stable | More stable than direct cooling |
Refrigerated Air Dryers
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