Desiccant Dryers
If you have external pipe work where the outside temperature can go as low as -12 degree C or you have a critical application where sudden expansion of the compressed air instantly lowers its temperature then you'll need a desiccant type dryer.
Two main types, air purged and heat regenerated.
A desiccant dryer absorbs the water vapour in to desiccant bed. The dryer has at least two beds so that when one is absorbing water vapour the other is drying out or "purging".
An Air Purged dryer uses approx 20% of the air passing through it to dry out a desiccant bed and it costs a fortune to run! A 500 cfm dryer operating for 6000 hrs per year costs approx £10k to operate.
The Heat Regenerative dryer uses electrically heated elements to heat the beds in order to dry them out. Although they consume electricity it's considerable less than the power consumed by the air compressor to generate the air used to operate an Air Purged dryer.
Heat regenerative dryers are more expensive than air purged. If electricity bills are an important consideration go for heat regenerative, if you couldn't care less go for air purged.
We recommend the Parker Donmick Hunter range. British manufactured in the North East of England, Whey Aye Man!
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