Quick answer: Choose an industrial dehumidifier in six steps: (1) set the target (RH at a temperature, or dew point) for what you are protecting; (2) calculate the moisture load; (3) fix the design condition the unit must work at; (4) pick the technology: refrigerant above about 15 °C at normal targets, desiccant for cold spaces or low dew points; (5) choose the format (portable, floor-standing, ceiling-mounted, ducted, cabinet) with power, drainage and controls; (6) agree how you will check it works. Capacity must be read at your design condition, not just the 30 °C / 80 % RH catalogue rating.
Quick answer
- Target → load → design condition → technology → format → acceptance.
- Refrigerant for warm spaces; desiccant for cold or very dry.
- Compare capacity at your condition, with the same scope.
Step 1: Define what you are controlling
Write the target and the reason: "below 50 % RH at 15–28 °C to protect packaging", "dew point below 5 °C in a cold store anteroom", "no condensation on battery plates". See warehouse humidity by stored goods.
Step 2: Quantify the moisture load
Add leakage, ventilation, doors, people, processes, open water and wet materials. See how to size a dehumidifier and the sizing calculator guide.
Step 3: Set the design condition
The temperature and RH at the unit's inlet in the worst case it must handle (for example the most humid summer week, or the coldest winter night). Capacity falls in cooler, drier air.
Step 4: Choose the technology
| Space condition | Technology |
|---|---|
| Above about 15–18 °C, target 40–60 % RH | Refrigerant |
| 5–15 °C | Compare refrigerant (with defrost) and desiccant |
| Below about 5 °C, or dew point below about 5 °C | Desiccant |
| Warm humid inlet air + low dew point | Refrigerant pre-cooling + desiccant |
Step 5: Choose the format
| Application | Format | Our range |
|---|---|---|
| Temporary jobs, restoration, moving duties | Portable | RYCM portable, 60–138 L/day |
| Warehouses, factories, greenhouses | Floor-standing | Industrial dehumidifiers, up to 960 L/day |
| Rooms with racks or crops on the floor; multi-room | Ceiling-mounted or ducted | Ceiling-mounted and ducted, 26–960 L/day |
| Cold stores, low dew points, cold sites | Desiccant | Desiccant dehumidifiers, 12–456 L/day |
| Electrical cabinets, BESS | Cabinet units | Energy storage and cabinet ranges |
Related: RYCM portable, industrial dehumidifiers, ceiling-mounted and ducted, desiccant dehumidifiers, energy storage.
Refrigerant ratings at 30 °C / 80 % RH; desiccant at 20 °C / 60 % RH.
Then check the full package: power supply, drainage, control interface, materials for the environment, service access and certificates; see the specification checklist.
Step 6: Verify at acceptance
Agree before ordering how you will check performance: humidity trends at stated points over a week including humid days, condensate collected, alarms tested. See installation site readiness.
FAQ
Frequently asked questions
What size industrial dehumidifier do I need?
Calculate the moisture load in kg/h at your target, then select a unit with that capacity at your design condition plus a margin.
Refrigerant or desiccant?
Refrigerant for warm spaces at normal humidity targets; desiccant for cold spaces or low dew points.
What information should I send a supplier?
Space size and use, target, design conditions, moisture sources, power supply, installation constraints and drainage.
Sources
- ASHRAE Handbook—HVAC Systems and Equipment, Dehumidification equipment.
- ASHRAE Handbook—Fundamentals, Psychrometrics.
