Low Temperature Applications (anything below 15°C)

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Anything under 15°C is low temperature for a dehumidifier and there is a risk of a traditional compressor based machine icing up because the air is cooled inside the dehumidifier until the water vapour condenses. The lower the ambient temperature the lower the temperature inside the dehumidifier and the closer to freezing you get, especially when the ambient air is below 15°C. This is why most compressor dehumidifiers spend only half their time drying the air below 15°C because they will always spend 30-40 minutes out of every hour defrosting themselves.

Compressor dehumidifiers are inefficient at low temperatures

The other factor is that compressor based machines extract less water out of the air the

A desiccant dehumidifier - the Meaco DD8L

For low temperature applications the DD8L is perfect and very popular with Meaco customers,

lower the temperature gets. Therefore a machine like the Meaco 20L that is rated at 20 litres per day at 30°C and 80%rh will extract about 3-5 litres per day when used in a garage at less than 10°C. For most garages this will actually be fine and certainly enough to control the relative humidity to a reasonable level.

Desiccants do not mind the cold

Desiccant dehumidifiers on the other hand do not care whether the temperature is 5 or 25°C and their performance will remain the same.  Therefore a desiccant dehumidifier like the Meaco DD8L Junior which extracts 8 litres per day will actually extract twice as much in a garage as a compressor based dehumidifier rated at 20 litres per day (at 30°C and 80%rh).

Draining the water and power cuts

These applications are usually unmanned and there is no-one there to keep an eye on the dehumidifier.  So you need a dehumidifier that can be drained away continuously so that you do not have to worry about emptying the container (which will fill up each day) and auto-restart so that if you have a power cut the dehumidifier will start to work again in the mode that you set rather than go into stand by mode waiting for you to press a button.

So what do you buy?

If you do have an application where the temperature will always be above 15°C then the compressor dehumidifiers will be fine and one like the Meaco 30L with it’s auto restart makes a lot of sense.  If the temperature is likely to drop below 15°C then it has to be a desiccant dehumidifier like the Meaco DD8L Junior.