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Refrigerated Air Dryer

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Refrigerated air dryer use mechanical refrigeration to lower the air temperature of the compressed air. This results in a lowering of the dew point that causes the moisture in the air to condense into liquid and be removed from the compressed air stream. Refrigerated air dryer can produce air with a dew point as low as 33-39F. They cannot operate below this range because the condensing water will freeze on the cooling coil of the dryer. These refrigerated dryer are designed to operate under all conditions.

Refrigerated dryer use two heat exchangers in series to condense entrained moisture and reheat the outlet air. Most dryers of this type precool the incoming air before it reaches the refrigeration chiller. Precooling reduces the load on the chiller so that smaller, less-expensive heat exchangers and compressors can be used.

Types of Refrigerated Dryers

Cycling Dryers - Cycling dryers use thermal storage, and cycle the refrigeration compressor on and off depending on the compressed air flow. They are ideal for systems with fluctuating airflow and moisture content.
Non Cycling Dryer - The dryer runs continuously regardless of the dryer load indicated by moisture content in the compressed air.

Refrigerated Dryer can also be classified into following types:

Tube-in-Tube Refrigerated Dryer - These dryers operate by cooling a mass of aluminum granules or bronze ribbon that in turn cools the compressed air. During the process, a thermometer in the granule mass senses its temperature. As the temperature rises, a switch turns on the refrigeration unit and vice versa.
Water-Chiller Refrigerated Dryer - These dryers use a mass of water for cooling. An extra heat exchanger is needed to maintain chilled water flow through the condenser, as well as a water pump.
Direct-Expansion Refrigerated Dryer - These dryers use a refrigerant-to-air cooling process to produce pressure dew points of 35° F below standard operating conditions.

Advantages

Smoother and faster running
Less downtime
Less product spoilage
Lower energy cost

Tags:- Refrigerated Air Dryer Manufacturers, Refrigerated Dryer, Refrigerated Dryer Supplier

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