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Dehumidification – Selection Guide

Part 4/4 – Where and why is dehumidification needed?

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Preserve and protect goods and materials

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Humidity problems concerningpreservation and protection of goodsand materials is typically a question of ensuring that the RH-value never exceeds a predetermined level.Usually the locale is a storage room or a warehouse. The quality of storage facilities variesconsiderable. Often they are either verywell sealed off from the outside air or poorly insulated.In both cases the air change is an important quantity.

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In the table below, you will see the difference in air change in various localesdepending on the quality of the insulation. However, the air change is not the only parameter to take into account.Again you must consider the humidity contribution from people, outsideair, goods and possible processes inside the storage room.

Air change

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Humidity conditions at a water work can be quite extreme.Here dehumidification is a question of protection and preservation of the water pipes, pumps and other equipment as well as the building itself.In most cases the water temperature is 6-9°C. This means that the surfacetemperature of the pipes is roughly the same.To avoid condensation the dew point temperature has to be lower than the surface temperature of the pipes.

Water works

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If the relative humidity is too high you will get a large amount of condensation on all metal surfaces.Paint will peel off the water pipes and serious attacks of corrosionwill set inThe humid environment also accelerates the growth of fungusand mold. Mosquitos thrive in the humid atmosphere and deposit their eggsin the open reservoir making it altogether very difficult to meetthe hygienic requirements.

High relative humidity

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The table below shows the max. RH-value if the water temperature is 7°C at different room temperatures to avoid condensation.

Max. RH-value if the water temperature is 7°C

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If you would like to read more from our Selection Guide clickhere.If you would like to read one of our case stories about dryingout water damage click here.

Further information

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