The idea of dehumidifying the air before it is circulated through the building is to reduce the moisture content of the air.
If outside air is used as the building cools at night, it will eventually reach the dew point of the air and the building will become damp, condensing on the cooler surfaces and equipment stored in there.
By recirculating the internal air during the day, dehumidifying it and heating it, the overall moisture content within the building will reduce. Which will reduce any condensation overnight, it should also contribute to overall higher temperatures within the building.
Ross
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