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being dried and delivered directly back to it. Using the room air rather than outside air for the intake airflow can be more consistent in its condition, and therefore lead to more accurate humidity control. Internal air often has less moisture than outside air, potentially resulting in a smaller dehumidifier being needed. However, many other location and airflow
configurations are available, including supply air being drawn from outside to over-pressurize an area and prevent air ingress. For areas that want a pressure-neutral arrangement with a desiccant system, the regeneration airstream can intake and exhaust externally, with the process air coming from and being delivered air back to the room being treated. Understanding exactly what internal conditions are required by the client’s team will help a contractor liaise with the supplier to find the best location and airflow set-up. Many other questions also need to be asked by
the contractor to determine the size of unit needed. To provide a dehumidifier with an adequate capacity, a supplier will need to know what the required room condition is, the size of the space (and therefore air volume), and how much air exchange takes place in the area. This might be through open doors or windows, or via an air handling unit. If the area is naturally ventilated, air exchange estimates need to be made and knowing how many doors, their size and how often they open is essential information. In addition to these factors, the number of people in the area and their activities
Humidification & dehumidification
is required along with any open sources of water. Giving this information to the supplier will allow a psychrometric calculation to be performed and a suitably sized unit to be offered. A quality supplier will be able and happy to give
advice on sizing information, along with all the other issues mentioned above. But it greatly helps avoid common pitfalls and deliver a successful project if these topics are considered as early in a dehumidifier project as possible.
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