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Dehumidifiers
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Realcold Milmech recommend and supply low dewpoint dehumidification systems to minimise frost build-up within blast and plate freezer enclosures. Less frost leads to improved operation of optical and proximity sensors and reduces defrost frequency times resulting in operational savings. Other benefits include reduced carton damage from ice build-up and improved barcode readability.
Our dehumidifiers incorporate technology from the worlds leading desiccant wheel manufacturers. Fully imported units are supplied in a standard design configuration, or a locally assembled version can be optimised to suit the individual application.
Desiccant dehumidifiers require a hot air stream to continually regenerate the wheel. The heat energy source is commonly steam or electrical, along with a dual steam / electric version with auto changeover to electric heating when steam supply is not available. Natural or LPG gas heating is also available.
Dry air capacities range from 300 l/s to 2300 l/s. The most common capacities for the low dew point units are 480 l/s and 770 l/s with delivery air dried to a dew point of below -40°C. The air flow is arranged so that the dry air stream from the dehumidifier provides a positive pressure to the freezer enclosure and minimises the ingress of moist ambient air.
Long term results depend on the integrity of the freezer enclosure, but we find that typically it is possible to achieve a dew point within the enclosure below -30°C. At that dew point range over time there will be light frost covering on the surfaces at refrigerant temperature (eg. plates, uninsulated pipe and hoses), but surfaces above that dew point, eg. structural steel, sensors, chains etc, will be frost free.
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