Refrigerated Air Dryers work by solving problems in your compressed air system that are caused by harmful moisture. When excess moisture is present in your system, it can damage your equipment as well as ruin products or processes, costing you a lot of money and time.
This process of drying is highly popular since it produces dew points which are sufficient for a lot of applications that use well-proven technologies; if installed, maintained, and sized thoroughly, then these tools will encounter only a few problems.
How to choose your refrigerated air compressor dryer
- Find out what pressure dew point you need
Pressure dew point is the temperature at which water vapor begins to condense into liquid water, at a given amount of pressure.
Before determining what exact pressure dew point you need, first understand a few of these information regarding the pressure dew point:
⇒Class 4 is the lowest pressure dew point class for a refrigerated dryer. This specific class delivers pressure dew point of +38°F.
⇒Refrigerated dryers are not supposed to operate below Class 4 since water vapor will freeze right in the dryer.
⇒Class 6 is the highest pressure dew point for a refrigerated dryer. It carries a pressure dew point of +50°F, which is the highest pressure dew point available.
Determine the pressure dew point by inquiring with the manufacturer what the PDP (pressure dew point) requirements are for your equipment, since doing so can make choosing a refrigerated air compressor dryer much easier for you.
If you are unable to gather information from the manufacturer, you can simply calculate the pressure dew point temperature that you need.
⇒First verify the lowest ambient temperature your compressed piping system will be exposed to. Inspect the positioning of air lines throughout air conditioned or un-heated areas that are below the surface, or between buildings.
Example: The piping and compressor is in the facility, and the lowest air temperature these will be exposed to is 58ºF
⇒Now, take the acquired number of temperature then lower it by 20º.
Lowest ambient temperature:
58ºF – 20º = 38º (required PDP)
This computation will give you the required PDP temperature to prevent water from forming downstream, and will help you determine the dew class point of the dryer that’s necessary for your needs.
- Ascertain the dew point class of the dryer you would need
These classifications are based from industry standards for compressed air dryers, plus keep in mind that the lower the dew point, the dryer the air gets.
⇒Class 4 maximum PDP = +38 ̊F
⇒Class 5 maximum PDP = +45 ̊F
⇒Class 6 maximum PDP = +50 ̊F
- Dryer Size
You should also determine the dryer size to know which compressor dryer you need, so here are some factors that you should consider when choosing the right dryer size for you.The following are the standard rate conditions:
– 100 ̊F Dryer Inlet, Air Temperature
– 100 ̊F Ambient Temperature
– 100 ̊F PSIG Inlet-Pressure
– 38 ̊F PDP Temperature
– 40 ̊F Least Ambient Air TemperatureTo measure the dryer’s capacity for settings such as the Standard Rate Conditions, use the Correction Factors / Multipliers table instead.
Correction Factor Table:
– PDP (Pressure Dew Point)
– SCFM (Volume of Compressed Air)
– °F (For maximum compressed air dryer inlet temperature and ambient temperature)
– PSIG (For maximum compressed air pressure and allowable dryer pressure drop)
The quality of air can have a consequential effect on compressed air systems, but with properly treated compressed air and the correct type of air dryer, there will be an improved and more enhanced productivity, system efficiency, and process or product quality. So choose the appropriate air dryer that is made of quality-items, and one that best suits your requirements since this is an integral piece in your air treatment system.