A dehumidifier controls the relative humidity in the warehouse so that the goods can be stored while maintaining high quality.
Dry air storages are used for a variety of materials: pharmaceuticals, food products, art, electronic equipment and for national defence equipment. Hygroscopic material is attracting moisture, which often creates favourable conditions for bacteria and mould. By keeping the relative humidity (RH) below 50% in the space, bacteria growth and mould can be prevented. With a controlled humidity also condensation and corrosion can be stopped.
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If the dew point of the air is kept below the surface temperature of a cold surface, for example a cold water pipe, there will be no condensation.
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Merchandise manufactured in materials such as iron and steel, demand low humidity. Vehicles, aircraft, machines and tools do not rust if the surrounding air is kept at a relative humidity below 50%.
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Organic materials such as leather and paintings, contain microorganisms. These can develop into fungus and mould, but will not occur if the relative humidity level is kept below 70%.
Bacteria requires a high humidity to survive and to multiply. If the humidity level of the surrounding air is kept below 50%, most bacteria will not survive. The limit is especially important when storing food products which are susceptible to bacteria.