Each application sets its own target: a freezer aisle, a GMP room and a print hall do not hold the same humidity, and they do not remove water the same way. The sections below state the band each case works to and the inputs used to size the equipment.
With a desiccant rotor unit. At freezer temperatures a condensing coil removes almost no water and ices up, while a rotor wheel takes the moisture out on the reactivation air, so ice stops forming on floors, rails and door frames.
Most pharmaceutical rooms and cleanrooms are specified in the 45–60% RH band, with tighter limits for moisture-sensitive products. The figure comes from the product, the process and the room classification, and it is the number the dehumidifier is sized against.
Assembly halls are commonly held around 40–55% RH: dry enough to limit moisture uptake in components and paste, but not so dry that static builds up. Bare boards and moisture-sensitive devices are stored in the lower end of that band, or in a dry room where the specification calls for it.
By holding the dew point of the room air below the temperature of the coldest surface. That removes the water film on ceilings, pipes and packaging lines without cooling the whole room, and it keeps the fabric dry where hygiene inspections look first.
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Paper changes length as it takes up or gives off moisture, so a stable band keeps registration and fold lines consistent through the run. Holding 45–55% RH also cuts static on sheet feeders and stops curling in stored stock.
From cubic metres and air changes, not from floor area. Volume multiplied by the air-change rate gives the outdoor air entering the space, and the moisture difference between that air and the target condition gives the load the unit has to remove each hour.
Yes. A dehumidifier removes the water vapour directly, so the space dries without raising the temperature of the whole building. Ceiling units suit car parks and plant rooms because they leave the floor and traffic routes clear.
Where moisture has to be added without steam and without a large temperature rise: textile weaving and spinning, print halls, greenhouses, woodworking and rooms with drying-sensitive materials. The output is matched to the calculated deficit of the room.
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Send the room dimensions, the highest and lowest temperature, the target humidity and the process inside. We reply with the calculation behind the model, not only a capacity figure. Enquiries are answered within one business day.
Dehumidifiers, ultrasonic humidifiers and constant temperature and humidity units are quoted with the condition each one holds, so the numbers can be compared.
