How They Work   Compressed air dryers are used to remove water and other contaminants from compressed air. Compressed air dryers use technologies such as refrigeration, desiccant adsorption, and membrane filtration to remove contaminants, particularly water, from the air.   Major groupings include refrigerant (which removes the water by cooling the air) force condensation, and desiccant (which adsorbs the water in the air with granular material such as activated alumina, silica gel...
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Q & A on Compressed Air Dryers

We asked our users for their input on Compressed Air Dryers. Here are the results of 214 users familiar with Compressed Air Dryers.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing compressed air dryer design?
31 answers
Answers:
- Refrigerant Compressor Manufacturer's - Use of Scroll Compressors for example - to reduce the energy costs. - Improved Heat Exchangers - in terms of both design and MOC. - Improved Instrumentation and closed loop controls. - Improved part load handling with responsive Thermal expansion valves and hot gas by-pass valves -Improved changeover valves for better reliability - In case of desiccant driers
~Vinay Gupta, Marketing/Sales, Nagpur, India
Integrated System, not really new technology but new packaging. Now instead of a separate refrigerated dryer sized for ambient conditions and easy to access, imports are explaining the benefits for their integrated dryer which is housed in the same cabinet where added heat is a factor and if in warmer climates the systems are less than adequate and fail, leaving you with 1/2 a compressor.
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
Low energy consumption is beginning to be a key draw for users. Any technology that uses the least energy will be a major breakthrough for any dryer manufacturer. Likewise, nano technology has been a new development recently.
~General Corporate Mgmt, Singapore, Singapore
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Q:
From your perspective, which companies are creating the most innovative compressed air dryers?
29 answers
Answers:
Rule out companies trying to push Variable Speed Dryers, that innovation has proven a failure too many times and it answers a question no one asked. Cycling dryers, Thermal Mass and Digital Scroll provide the same energy savings in a proven package trouble free.
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
Dh/ultra filters in PSA systems and Parker in membrane based systems for low capacity apps.
~Sivasubramanian KV, Director, Mumbai, India
In India: M/s Indcon Projects and Equipments Ltd. M/s. Trident Pneumatics
~MAYANK SHARMA, Engineering Consultant, New Delhi, INDIA
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Applications and UseTop

Q:
What are some of the applications you have used compressed air dryers for?
45 answers
Answers:
We have promoted the same for various applications such as - - Pneumatic conveying - Instrumentation air - Powder coating plants - Spinning Plant - especially for compressed air used for Auto Coners, Jet Spinners and Jet Looms.
~Vinay Gupta, Marketing/Sales, Nagpur, India
For the use of my plastic powder coating equipment. For the use of my abrasive blasting machine for my air powered tools. For running a printing press for a client.
~Engineering, Process/Production, ACCRA, Ghana
Control of general plant air quality, pre-treatment for Nitrogen generators, sterile breathing air treatment, semiconductor manufacturing, etc.
~General Corporate Mgmt, Singapore, Singapore
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Q:
Please share with us any “non-standard” applications that compressed air dryers have been used for.
14 answers
Answers:
I have used them as air coolers for specific applications by removing the re-heater exchanger on them.
~Todd M, Engineer, Downers Grove, IL
Too dry air that builds pressure for water supply in family and factory buildings.
~Anders Nilsson, Technical Support, Lund, Sweden
Apart from drying compressed air, I have no idea what they could be used for...
~Serge L, Napierville, Canada
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of compressed air dryers?
17 answers
Answers:
Dryer faults due to temperature, not over sizing to compensate for high ambient (what works in the spring doesn't mean it will work in the dog days of summer). Moisture from a failed system or undersized can lead to expensive plant repairs, product recall or failure.
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
When replacing a refrigerated dryer with a regenerative unit in an existing system, people have to be careful that their purge loss does not render their compressor to be too small.
~David B., Marketing/Sales, Sylvania, OH
Pitting in the piping causing huge money going to waste in the form of Air Leakages, increased maintenance and failure of instrumentation.
~Syed Aoun A, Engineer, Lahore, Pakistan
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
27 answers
Answers:
Low pressure drop across the dryer No leakages Low or now air consumption for regeneration Low nose Clear indicator of cost to run the equipment (it would make selection easier and make it clear the actual cost of using compressed air in the plant)
~Micheal O, Engineering Consultant, Campinas, Brasil
- Better Part Load Handling - with a stable dew point - especially given the occasionally rapid and frequently huge ambient temperature swings experienced in our region - Better reliability in dusty environs
~Vinay Gupta, Marketing/Sales, Nagpur, India
Digital Scroll, Digital Evaporator, No-Loss Drains, Easily Maintained Filtration in the package (no line filters) for simple installation and gauges mounted for easy operating status.
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using compressed air dryers?
28 answers
Answers:
Selection & Proper Installation is the key - Selection of Drier Package: Type - Based on Application, Compressor Type and ambient conditions Sizing - Based on Inlet air temperature, ambient temperatures, flow and working pressure. Special care is needed for applications with frequently varying loads.
~Vinay Gupta, Marketing/Sales, Nagpur, India
Oversize refrig dryers to account for high inlet and ambient temps; take into account pressure drops across filters dryers; only dry the air to minimum required (do not over specify the dryer).
~Bill R, Marketing/Sales, Cedar Rapids, IA
Look at correction factors, size to your climate and stay away from putting all your eggs in one basket with integrated systems.
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of compressed air dryers?
23 answers
Answers:
Do an independent "complete air supply and air demand audit" of your system when designing or expanding any system. Don't believe that variable speed drive systems are the best solution for your compressed air systems, it may not be the best solution for keeping moisture from your system.
~Sal G, Marketing/Sales, Naperville, IL
Look at correction factors, size to your climate and stay away from putting all your eggs in one basket with integrated systems. Make sure the placement promotes fresh air to the unit and the compressor cooler isn't exhausting to the dryer or vice versa...
~Gregory S, Sales Engineer and Energy Auditor, Fresno, CA
For heat of compression type dryers using electric heater for regeneration temperature control, ensure to design the same considering voltage over/under- tolerance (+ or -) to select the correct wattage of heater.
~MAYANK SHARMA, Engineering Consultant, New Delhi, INDIA
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