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COMPRESSED AIR TREATMENT & AIR DRYERS

Air & Water

All atmospheric, or ambient air contains moisture in the form of water vapour, which will condense into liquid water when the air cools to its saturation point, or dew point, the point where it can no longer hold water vapour.

The amount of moisture in ambient air depends upon its temperature and relative humidity. The warmer the temperature, the more moisture ambient air can hold. A rule of thumb is that the amount of moisture air can contain at a saturated condition doubles for every 20ºF/7ºC increase in temperature.

This means that the amount of potential condensate present in air is greater in summer than in winter, during the day than at night, and in warmer locations like the Southern US, versus colder locations like Canada.


What Happens & How Air Dryers Help

When ambient air is compressed, a considerably amount of heat is produced in the process. As this hot, compressed air exits the air compressor and travels through the distribution system, the compressed air cools down to ambient, or room temperature. This causes the water vapour in the compressed air to condense into liquid water in the distribution system.


Compressed air dryers cool down compressed air to a temperature where moisture in the compressed air is condensed into a liquid state, and consequently removed from the compressed air distribution system. It is critical that the air dryer dries the air at a dew point temperature below the lowest temperature to which the compressed air will be exposed. Incorporating an air dryer for your particular application will ensure the delivery of dry, cool compressed air to your compressed air distribution system.

Dry, Cool Air is Critical for Most Applications

So why is the treatment of compressed air important? Dry, cool air is critical in many applications, as well as essential in ensuring an air system’s reliability and efficiency.

Employing an air dryer ensures the delivery of dry, cool compressed air, preventing moisture from reaching sensitive areas downstream from the air compressor and damaging pneumatic equipment and tools, as well as ensuring production quality standards are not compromised.

Dry, cool air is critical for applications such as auto body collision repair shops because the end product is directly affected by the quality of compressed air.
Compressed air delivered directly from an air compressor is usually not suitable for its intended use due to many factors:

  • The discharge temperature from the air compressor may be too high for distribution & use and this hot, compressed air contains moisture that will ultimately condense into liquid as it cools travelling through the distribution system.
  • Water accumulation on the inner surfaces of pipes and fittings also causes an increase in pressure drop. A loss of pressure is a loss of energy used to compress air.
  • In addition to satisfying an applications particular compressed air requirements, dry, cool, clean air most likely always results in lower operating costs.

We can see that compressed air treatment is critical in ensuring an efficient and effective compressed air system.

Standard Temperature Dryers

Let’s discuss the features and benefits of the ProDry® ASD refrigerated air dryer (used with rotary screw air compressors). It’s a standard temperature air dryer with a maximum air inlet temperature of 120ºF or 48ºC. It is microprocessor controlled and maintains a stable dew point.

Features & Benefits:

  • An energy-efficient variable speed fan, aligning energy use with air demand.
  • A two-way heat exchanger, which improves efficiency and energy savings.
  • A high-efficiency, stainless steel moisture separator, promoting a low pressure drop and smooth operation.
  • A patented refrigerant circuit design, which adjusts cooling capacity to air volume and temperature.
  • Self-adjusting controls provide a low and constant dew point while preventing icing.
  • Thermally protected cooling fans & safety system
  • The ASD Series also features an on / off switch for models ASD60 to ASD500.
  • An automatic electronic drain is standard on all ProDry® ASD air dryers
  • And models ASD10 to ASD200 are UL approved.

High Temperature Dryers

Let’s discuss the features and benefits of the ProDry® HTD refrigerated air dryer. It’s a high temperature air dryer with a maximum air inlet temperature of 180ºF or 82ºC (Used with DV Systems' reciprocating air compressors). It is microprocessor controlled and maintains a stable dew point.

Features & Benefits:

  • An energy-efficient variable speed fan, aligning energy use with air demand.
  • A two-way heat exchanger, which improves efficiency and energy savings.
  • A high-efficiency, stainless steel moisture separator, promoting a low pressure drop and smooth operation.
  • A patented refrigerant circuit design, which adjusts cooling capacity to air volume and temperature.
  • Self-adjusting controls provide a low and constant dew point while preventing icing.
  • Thermally protected cooling fans & safety system
  • Models HTD26 to HTD52 come equipped with an internal 0.1 micron Air Filter
  • An automatic electronic drain is standard on all ProDry® HTD air dryers

The dairy industry uses dry, cool, clean compressed air to pneumatically operate state-of-the-art automation technology

Benefits of Air Treatment

Compressed air treatment is critical for most compressed air applications. Here are a few benefits of employing the appropriate air dryers and air filtration in your compressed air application:

  • Reduced wear and tear on pneumatic tools: Tool life is increased while maintenance is reduced.
  • Reduced compressed air consumption throughout your compressed air system: More air is used when it is contaminated with water, oil and other contaminants.
  • Increased production in your facility: Tools are able to be immediately used without the need to purge water or contaminants from compressed air lines.
  • Compressed air pipe life extended due to the elimination of internal water corrosion.
  • Improved production quality: Contaminated compressed air can impact product quality negatively.
  • Since compressed air treatment reduces moisture in the compressed air distribution system, downstream trap maintenance is virtually eliminated.

ASD versus HTD

Now let’s quickly compare the ASD and HTD series refrigerated air dryers:

  • The dew point temperature for an ASD series is 1 to 4 ºC or 33 to 39ºF and the HTD series is 3ºC or 37º F.
  • The maximum inlet temperature for an ASD series is 49ºC or 120ºF and the HTD series is 83ºC or 180º F.
  • The maximum inlet pressure is 174 to 232 PSI for the ASD series and 232 PSI for the HTD series.
  • Both ASD and HTD air dryers feature a microprocessor controller, digital dew point indicator, and adjustable parameters.
  • Both ASD and HTD air dryers feature a high efficiency, stainless steel internal filter.
  • And the HTD features an internal aftercooler.

Warranty
1 Year

Both Standard and High temperature ASD and HTD series refrigerated air dryers come with a 1 year limited warranty.

 

Accessories
DF Series Air Filters

Refrigerated compressed air dryers are only one critical component of your compressed air treatment solution. DV Systems recommends the integration of DF series air filters to ensure the delivery of cool, dry, clean air that is appropriate for your particular compressed air quality requirements.

The use of a 1 Micron DF Series air filter upstream of your ProDry ASD or HTD series refrigerated air dryer is highly recommended for all applications.

Installation Example
High Temperature Air Dryer

1 VAV5062 HDI SERIES AIR COMPRESSOR
2 QUICK-CONNECT AIR PIPE
3 DF65A (1 MICRON)
4 PRODRY® HTD52 AIR DRYER
5 DF65E (0.01 MICRON) CLASS 1.4.2
6 DF65V (CARBON)
7 ECOTRON CONDENSATE FILTRATION


Installation Example
Standard Temperature Air Dryer

1 HURON B10 AIRSYSTEM
2 PRODRY® ASD40 AIR DRYER
3 QUICK-CONNECT AIR PIPE
4 DF65P (0.1 MICRON)
5 DF65E (0.01 MICRON)
6 ECOTRON CONDENSATE FILTRATION

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