Liquid Desiccant Dehumidification Systems | Industrial Humidity Control & AHU Solutions | YUJU
Liquid Desiccant Dehumidification Systems for Industrial Humidity Control
Low-humidity air treatment, latent-load control, desiccant regeneration and AHU integration for industrial, commercial and process HVAC applications.
Liquid desiccant dehumidification removes moisture from an airstream by contacting it with a hygroscopic liquid solution rather than relying only on cooling the air below its dew point.
The technology can be integrated with AHUs, dedicated outdoor air systems, heat pumps, cooling systems and available regeneration heat sources to provide controlled humidity for demanding HVAC and industrial environments.
• Independent latent-load treatment
• Controlled supply-air humidity
• Liquid desiccant regeneration
• AHU / DOAS integration
• Waste-heat or heat-pump heat recovery potential
• Industrial process humidity control
• Custom HVAC engineering support
How Does Liquid Desiccant Dehumidification Work?
A liquid desiccant has a lower water-vapor pressure than the humid air under suitable temperature and concentration conditions. When the air and solution are brought into contact, water vapor transfers from the air into the desiccant solution.
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Air / Liquid Desiccant Contact
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Moisture Transfers into the Solution
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Lower-Humidity Air
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Supply Air or Further Sensible Cooling
The absorbed moisture dilutes the desiccant. The solution must therefore be regenerated before it can continuously return to the dehumidification process.
Dehumidification and Regeneration Cycle
A practical liquid desiccant system generally includes two primary processes:
| Process | Function |
| Conditioner / Dehumidifier | Transfers moisture from the process air into the liquid desiccant. |
| Regenerator | Removes absorbed moisture from the diluted solution and restores desiccant concentration. |
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Dehumidification
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Diluted Desiccant
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Regeneration
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Concentrated Desiccant Returned to the Conditioner
Common Liquid Desiccant Materials
Liquid desiccant systems may use hygroscopic solutions such as lithium chloride, calcium chloride or glycol-based solutions, depending on system design and operating conditions.
Desiccant selection affects vapor pressure, operating concentration, material compatibility, crystallization limits and overall system performance.
Liquid Desiccant vs. Refrigeration Dehumidification
| Item | Refrigeration Dehumidification | Liquid Desiccant |
| Moisture Removal | Condenses moisture below the air dew point | Absorbs water vapor into a hygroscopic solution |
| Latent Load | Handled by cooling coil | Handled primarily by the desiccant process |
| Regeneration | Not required for a desiccant | Required to reconcentrate the solution |
| Heat Integration | Depends on refrigeration architecture | Can potentially use available regeneration heat |
The best system depends on target humidity, entering-air conditions, airflow, cooling availability and total lifecycle energy use. Hybrid configurations can combine both technologies.
Liquid Desiccant vs. Desiccant Wheel
| Item | Liquid Desiccant | Solid Desiccant Wheel |
| Desiccant | Liquid hygroscopic solution | Solid desiccant media |
| Circulation | Solution circulation by pump | Rotating wheel |
| Regeneration | Solution reconcentration | Heated regeneration air |
| Very Low Dew Point | Application-specific engineering required | Widely applied in low-dew-point process systems |
For battery dry rooms, semiconductor facilities and other extremely low-humidity processes, technology selection must be based on the required supply-air moisture content or dew point rather than on technology name alone.
Why Separate Sensible and Latent Loads?
High latent loads can force conventional cooling coils to operate at low temperatures to remove moisture. In some systems, the air may then require temperature adjustment before being supplied to the space.
A liquid desiccant stage can handle part of the moisture load independently while a cooling coil or other terminal system handles sensible cooling.
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Latent Load → Liquid Desiccant Stage
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Sensible Load → Cooling / Heat Exchange Stage
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Controlled Supply Air
Regeneration Heat Integration
One of the important engineering opportunities in a liquid desiccant system is the ability to evaluate available thermal energy for regeneration.
• Industrial waste heat
• Heat-pump condenser heat
• Hot-water loops
• Solar thermal energy
• Other recoverable low-grade thermal sources
Available heat does not automatically guarantee lower total energy consumption. Pumps, fans, cooling demand, regeneration efficiency and auxiliary equipment must be included in the complete energy analysis.
Typical Applications
| Application | Humidity-Control Objective |
| Industrial Manufacturing | Stable process humidity and high latent-load control |
| Pharmaceutical & Clean Environments | Controlled humidity and outdoor-air treatment |
| Food Processing & Storage | Humidity and condensation management |
| High Outdoor-Air Buildings | Reduction of ventilation latent load |
| Underground Facilities | Persistent high-humidity control |
| Archives & Museums | Stable environmental humidity |
Low-Dew-Point Industrial Applications
Battery manufacturing, semiconductor production and other dry-room processes can require very low supply-air moisture levels.
For these applications, YUJU does not recommend selecting a dehumidification technology from a general product description alone.
• Required room temperature and RH or dew point
• Supply-air dew point requirement
• Outdoor design condition
• Process moisture generation
• Fresh-air requirement
• Room pressurization requirement
• Total airflow
• Available cooling and heating sources
• Required redundancy level
Depending on these conditions, a liquid desiccant system, desiccant wheel system, refrigeration system or multi-stage hybrid configuration may be more appropriate.
Integration with AHU and DOAS
Liquid desiccant technology can be integrated as part of a custom air-handling or dedicated outdoor-air system.
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Filtration / Pre-Treatment
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Liquid Desiccant Dehumidification
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Sensible Cooling / Temperature Adjustment
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Supply Fan
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Controlled Supply Air
The final configuration depends on entering-air conditions, supply-air requirements, external static pressure, heat-source availability and process requirements.
Key Engineering Challenges
| Challenge | Engineering Consideration |
| Corrosion | Material compatibility must be evaluated for the selected solution. |
| Solution Carryover | Air-side design should minimize desiccant droplets entering the supply airstream. |
| Crystallization | Operating concentration and temperature must remain within the applicable solution range. |
| Regeneration Energy | Total thermal and electrical energy must be included in system evaluation. |
| Controls | Air temperature, humidity, solution concentration and thermal sources require coordinated control. |
YUJU Engineering Approach
YUJU EnvironTech treats liquid desiccant dehumidification as an engineered air-treatment technology rather than a single standalone product.
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Temperature / Humidity / Dew Point Target
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Sensible & Latent Load Analysis
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Technology Comparison
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AHU / Dehumidification System Configuration
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Heat & Energy Integration
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Controls and EMS Strategy
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Project-Specific HVAC Solution
OEM & Project Support
For overseas projects, YUJU can support system integration around the required operating conditions rather than forcing a fixed standard configuration into every application.
• HVAC concept development
• Airflow and latent-load analysis
• AHU configuration support
• Dehumidification technology selection
• Heat-recovery and regeneration concept
• Controls and BMS / EMS integration
• Equipment selection and customization
• OEM / ODM engineering coordination
A reliable dehumidification system starts with the required air condition — not with a predefined piece of equipment.
YUJU evaluates temperature, humidity, dew point, airflow, latent load, available thermal energy, equipment space and control requirements before selecting the appropriate refrigeration, solid-desiccant, liquid-desiccant or hybrid solution.
Whole-system engineering for controlled indoor and process environments.
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