Different Types of Dehumidifier
- Good extraction capacity to solve damp and condensation problems with lower running costs.
- Use a compressor and a heat exchanger to remove moisture from the air.
- These dehumidifiers are most suited to domestic applications such as houses.
Desiccant wheel dehumidifiers
- Extract a large amount of water but have very high running costs.
- At typical UK conditions in occupied UK homes they consume twice as much electricity per litre of water removed.
- They are more suitable for unheated buildings where the temperature drops below 5°C.
- These dehumidifiers are mostly used in industrial and construction projects where very large amounts of water need removed and running costs are not important.
Where the dehumidifier will be used?
Most domestic dehumidifiers are used to prevent condensation and dampness in an occupied home, however some people use them to protecting against dampness in an unoccupied space such as garages.
Condensation and dampness in an occupied home
Even though dampness or condensation may only be a problem in one part of your home, the source of this excess moisture will be come from a number of places.
The bathroom, kitchen and people generate the most moisture in the home.
Your entire house generates excess moisture and in most cases, the best solution is a compressor dehumidifier with an average extraction rate of around 18 litres.
If you have a particularly small home, with just one person, then lower capacity dehumidifiers with an extraction rate of 12 to 15 litres will be sufficient.
Protecting property in an unoccupied space
Items that are stored in garages or outbuildings need to have a dehumidifier to prevent deterioration, damage, dampness or mould.
The ideal Relative Humidity to prevent damage is below 50%.
If there is no heating in the space and the space is reasonably well sealed - any type of dehumidifier will be satisfactory providing it has a reliable humidistat.
How much water needs to be removed?
|Number of people||x1||x2||x3||x4||x5+|
|Equivalent Extraction Rate||12 litres||15 litres||18 litres||20 litres||25 litres|
|Moisture Created and Collected||1.5 litres||1.7 litres||2.5 litres||2.75 litres||3 litres|
How do I control the dehumidifier
Changing outside temperatures determine the optimum Relative Humidity (RH) setting for a dehumidifier. As the outside temperature changes frequently, a manually adjustable humidistat needs to be reset regularly – ideally every hour.
The optimum relative humidity to prevent problems could be anywhere between 50% and 35%.
If the settings on your dehumidifier are not adjusted to the optimum level - the dehumidifier could be off and not control condensation and dampness or alternatively be on for too long and waste electricity.
To provide accurate control, the humidistat should be adjustable in 1% steps to get the best performance. Some humidistats can only be adjusted in 5% steps. Such wide steps mean that the dehumidifier will not run enough or will run for too long.
An automatic control like Ebac’s Smart Control handles adjustments automatically.
Ebac’s Smart Control gathers data from the air in your house and automatically adjusts to match the current extraction needs rather than to control an unknown Relative Humidity (RH).
Ebac‘s Smart Control guarantees that the dehumidifier runs enough to prevent dampness and condensation but not too much, therefore it never wastes large amounts of electricity!