Dehumidification of flood damaged buildings
The primary benefit of a refrigeration type dehumidifier is that it performs well when used in a warm humid environment. Moisture extraction rates will deteriorate rapidly as both temperature and humidity is reduced. It is generally accepted that refrigeration dehumidifiers should not be used below 10°C dewpoint.
A desiccant dehumidifier operates on a totally different principle to a refrigeration type. The main benefit is that it performs exceptionally well when used in cooler climates, or when lower dew points are required. As there is no water produced during the drying process, these units work effectively at sub-zero temperatures.
Air leaving a desiccant dehumidifier is warm, very dry and at high velocity, thereby providing the three essential ingredients necessary for fast and effective drying. The dry air can be easily ducted to where drying is needed most, whether it is under a floor, into a wall cavity or simply distributed to serve multiple areas.
Whilst the purchase of a desiccant dehumidifier is probably not within the financial budgets of most home owners, some restoration companies now provide small desiccant units for hire. High capacity desiccant dehumidifiers should be used for drying larger buildings such as schools, warehouses, municipal buildings, etc