DP -70°C
Desiccant Dehumidifier
DHU series absorption desiccant dehumidifiers featuring high-density silica gel rotors delivering constant supply air down to -70°C dew point.
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Primary Product Lineup
Engineered Silica Gel Dehumidification & Environmental Systems
Precision-manufactured adsorption rotors, turnkey dry room infrastructure, and chemical solvent recovery systems directly supplied by our Lin'an, Hangzhou manufacturing facility.
DP -70°C
Turnkey EPC
Turn-key Dry Room System
Complete ultra-low humidity dry rooms tailored for lithium battery assembly, featuring high-airtight envelope panels and dual-rotor systems.
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Recovery ≥99%
NMP Recovery System
ZJRH Series N-Methyl-2-pyrrolidone solvent recovery modules for battery electrode coaters, cutting raw solvent overheads and exhaust emissions.
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Cooling + RTO
VOC Abatement System
JEN Series Regenerative Thermal Oxidation (RTO) and deep cryogenic condensation setups designed to scrub volatile organic compounds compliant with EU/US laws.
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Energy Efficient
Refrigerative Dehumidifier
High-capacity condensing refrigeration dehumidifier engineered for bulk air pre-treatment upstream of silica gel absorption rotors and warehouse dry bulk storage.
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Cleanroom ISO 5-8
Cleanroom Dry Chambers
Integrated cleanroom enclosures matching tight low-dew-point environmental control with dust-free particle filtration designed for cell winding and sealing.
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Ultra-Low Dewpoint
Two-Stage Silica Gel Systems
Dual-wheel absorption configurations cascading silica gel rotors with active chemical cooling coils, sustaining -60°C to -70°C DP across variable ambient temperatures.
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Custom HVAC / Skid
Integrated Environmental Skids
Turnkey pre-piped and pre-wired skid units combining high-performance absorption dehumidification wheels with heat exchangers and self-tuning PLC panels.
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CATL
Tesla
Northvolt
BYD Auto
ATL Amperex
EVE Energy
Farasis Energy
Envision AESC
SVOLT
Techtronic Industries (TTI)
Technical White Paper & Deep Analysis
The Core Science of China Absorption Dehumidifier Silica Gel Rotors
Hangzhou DryAir Treatment Co., Ltd. (founded 2010, Lin'an, Hangzhou) operates as a benchmark manufacturer controlling over 30% of China's high-specification desiccant dehumidifier market.
Micro-Porous Chemisorption Physics
The fundamental efficacy of our silica gel rotors lies in the synthesized honeycomb matrix composed of corrugated ceramic fiber impregnated with ultrafine active silica gel and synthetic metal silicates. With internal specific surface areas exceeding 800 m²/g, water vapor is selectively sequestered via capillary condensation without structural liquid dissolution or material shedding.
Thermal Regeneration Dynamics
Operating across an optimized 3:1 process-to-regeneration sector ratio, the wheel continuously counter-rotates through a counter-current reactivation zone heated to 120°C–140°C. Hangzhou DryAir engineers integrated regenerative heat-recovery stages, stripping thermal energy from outgoing hot reactivation air to preheat inlet process airstreams, curbing specific energy consumption by up to 28%.
Continuous -70°C Dew Point Stability
Single-rotor configurations typically bottom out at -20°C to -40°C DP. Our multi-stage desiccant rotor engineering pairs pre-cooling dehumidification stages with dual cascaded silica gel or molecular sieve hybrid wheels. This allows mission-critical facilities, such as solid-state battery dry rooms, to maintain a consistent -70°C dew point year-round.
-70°C
Minimum Supply Dew Point
≥99%
NMP Solvent Recovery
30%+
Domestic Market Share
200+
Monthly Unit Capacity
74
R&D Specialists & Senior Eng.
Supply Chain Excellence
Why Global Fortune 500 Enterprises Source DryAir from China
International procurement directors evaluate more than unit prices; they demand manufacturing agility, uncompromised raw materials, and verified performance scalability.
Upstream Material Integration
Situated in the industrial heart of Zhejiang Province, Hangzhou DryAir taps directly into a world-class supply chain for high-modulus inorganic ceramic fibers, structural aluminum extrusions, precision drive motors, and food-grade heat-resistant silicone seals. This complete localized integration slashes raw material procurement lead times to under 10 business days.
Gigafactory-Paced Scalability
With modern automated production facilities generating over 200 heavy-industrial dehumidification units monthly, we support parallel gigawatt-scale expansion lines. When top-tier battery manufacturers roll out multi-gigawatt facilities simultaneously across European and Asian hubs, DryAir guarantees scheduled deliveries without bottlenecking construction timelines.
Cost Efficiency with High TCO Value
China's mature engineering clusters allow us to deliver fully customized, certified industrial dehumidification systems at a 30% to 45% CAPEX advantage compared to Western European or American manufacturers. Combined with energy-efficient heat recovery designs, our systems deliver substantial lifecycle total cost of ownership (TCO) reductions.
Compliance, Certification & Global Field Support
Engineering Rigor Backed by Global Auditing Standards
Deploying industrial environmental machinery across transatlantic or APAC destinations requires adherence to strict electrical, pressure vessel, and environmental safety codes.
UL, CSA & CE Compliance
Our electrical enclosures, switchgear, PLC systems (Siemens, Schneider, Allen Bradley), and mechanical skids conform to UL 508A, CSA C22.2, and the European Machinery Directive (CE-MD/LVD/EMC), simplifying local municipal permitting.
ASME & EAC Pressure Vessels
For integration into complex oil/gas distillation and chemical heat recovery circuits, our condensers, steam heaters, and pressure piping adhere to ASME Section VIII standards as well as Eurasian EAC Customs Union protocols.
Remote Diagnostics 4.0
Every system features an IoT-ready telemetry interface. Factory service engineers in Hangzhou monitor vibration spectra, dew point readouts, and temperature gradients in real time, supporting plant operators across Europe and the Americas.
Global Dispatch & 2-Yr Warranty
We offer comprehensive commissioning services with experienced field engineers dispatched directly to your job site. International clients can also leverage our extended 2-year overseas warranty and local stocking partner programs.
Application Matrix
Precision Environmental Profiles Across Demanding Sectors
Moisture sensitivity varies across production environments. Hangzhou DryAir engineers system airflow, duct sealing, and rotor depth around targeted industrial processes.
| Target Sector / Process Area | Critical Moisture Constraint | Typical Dew Point (DP) / RH | Applied DryAir System Architecture |
|---|---|---|---|
| Lithium-Ion Cell Electrolyte Filling | Moisture exposure reacts with LiPF6 electrolyte to generate toxic Hydrofluoric Acid (HF). | -45°C to -60°C DP | Turn-key Low Dew Point Dry Room System with 2-Stage Silica Gel / Zeolite Rotors. |
| Solid-State & Lithium Metal R&D | Pure metallic lithium degrades rapidly upon contact with ambient humidity. | -65°C to -70°C DP | Ultra-Deep Rotary Absorption Dehumidifier with Glycol Deep Chill Chiller Pre-Cooling. |
| Electrode Slurry Coating & Drying | High-temperature exhaust carries evaporated NMP organic solvent vapors. | ≥99% Solvent Yield | ZJRH Series Closed-Loop NMP Recovery System with Dual Water/Air Heat Exchangers. |
| Effervescent Tablets & Softgel Capsules | Hygroscopic powder caking causes tablet press clogging and structural swelling. | 10% to 25% RH | DHU Industrial Silica Gel Dehumidifier coupled with HEPA Cleanroom Filtration. |
| Military Equipment & Munitions Depot | Atmospheric oxidation, propellant corrosion, and micro-cracking in avionics. | ≤35% to 40% RH | GJB National Military Standard Anti-Corrosion Absorption Dehumidification Rig. |
| Fuel Transfer & Petrochem Terminals | Volatile hydrocarbons escape during oil loading and storage breathing. | <20 mg/m³ Exhaust | Cryogenic Condensation plus Catalytic / RTO VOC Abatement System. |
Future-Proof Engineering
Technological Trajectories in Industrial Dehumidification
Modern plants demand reduced operational expenses and carbon footprints. Our engineering roadmap addresses these shifting industry priorities.
1. Waste Heat-Powered Desorption
Industrial electricity tariffs represent the largest operating expense in continuous desiccant operations. Hangzhou DryAir systems adapt to utilize waste heat from plant compressors, boiler hot water, and co-gen steam, reducing electrical heater loads during the regeneration cycle by up to 60%.
2. AI Predictive Humidity Modulation
Traditional static-speed rotors run flat-out regardless of fluctuating ambient weather. DryAir's modern control algorithms dynamically adjust rotor drive frequency, fan speeds, and reactivation valve openings based on real-time psychrometric calculations, avoiding energy waste during drier operating conditions.
3. Hybrid MOF Adsorbent Matrix
In collaboration with academic research laboratories, our R&D group is testing next-generation Metal-Organic Framework (MOF) rotor coatings. These materials provide tunable pore structures and lower desorption temperature thresholds, unlocking future regeneration temperatures as low as 75°C to 85°C.
Procurement & Engineering Insights
Frequently Asked Technical Questions
Key engineering clarifications, operational parameters, and procurement queries answered directly by our technical director.
What is the lowest dew point a DryAir desiccant dehumidifier can achieve?
Hangzhou DryAir rotary desiccant dehumidifiers can reliably control supply air down to a minimum of -70°C dew point (equivalent to less than 0.0033 grams of moisture per kilogram of dry air). This performance level is essential for lithium battery cell assembly, electrolyte filling, and moisture-sensitive lithium metal applications.
Do you supply complete turnkey dry rooms for battery factories outside China?
Yes. Hangzhou DryAir delivers complete turnkey dry room EPC projects internationally—covering front-end engineering design, envelope sandwich panel manufacturing, absorption rotor dehumidification skids, cleanroom air distribution, on-site mechanical installation, and commissioning. We have supported global facilities including Tesla, Northvolt, and TTI.
Which certifications do DryAir systems hold for export markets?
Depending on destination market requirements, DryAir systems can be fully certified under CE (Machinery, Low Voltage, and EMC Directives), UL 508A for the North American market, CSA standards for Canada, ASME Section VIII for pressure piping/vessels, and EAC for Eurasian territories. We also operate under ISO 9001 and the GJB national military quality standard.
What solvent recovery rate can a DryAir NMP recovery system reach?
DryAir ZJRH NMP recovery systems are engineered to achieve an overall solvent recovery rate of ≥99% on lithium-ion electrode coating lines. By using staged chilled-water condensation alongside desiccant adsorption wheels, the process cleans the exhaust stream to under 5–10 mg/m³ while generating reusable liquid NMP.
What after-sales and spare parts support is available for international buyers?
We provide structured overseas customer support, including optional two-year service contracts, remote digital diagnostics, fast dispatch of original wear components (drive belts, silicone seals, filters, heater elements), and on-site engineering support during critical maintenance outages.
How does silica gel rotor performance compare to molecular sieve wheels?
High-grade silica gel rotors excel in standard industrial conditions, offering high moisture capacity and low regeneration temperatures (100°C–130°C). Molecular sieve (zeolite) wheels are utilized when targeting dew points below -50°C to -70°C in low inlet humidity environments, requiring regeneration temperatures of 140°C–180°C. DryAir manufactures both varieties to optimize energy consumption based on project specifications.
Full Industrial Catalog
Comprehensive Absorption Rotor Machinery & Systems
Explore our complete range of moisture control and industrial environmental equipment engineered in Lin'an, Hangzhou.
Factory Tested
Modular Absorption Rotor Skid
Heavy-duty desiccant wheels mounted in structural frames, equipped with precision chain drives, perimeter seals, and variable speed motors.
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Turnkey Supply
Gigafactory Battery Dry Room
High-capacity turnkey dry room construction for large-scale battery manufacturing lines, delivering certified -50°C DP environments with energy-efficient air management.
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Green Recycling
Closed-Loop NMP System
Integrated solvent condensation and scrubbing setups engineered to recover high-purity NMP while maintaining consistent coating oven pressure balance.
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EPA Standard
RTO & VOC Oxidizer Skids
Thermal oxidation and deep cooling condensation plants engineered to break down complex VOC exhaust into carbon dioxide and water vapor.
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Warehouse Duty
Refrigeration Dehumidifier
Heavy-gauge sheet metal casing, scroll compressor cooling circuit, and hydrophilic aluminum fin heat exchangers designed for high-humidity warehouse bulk storage.
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GMP Class
Pharmaceutical Air Handler
Stainless-steel hygienic absorption air handling units meeting GMP cleanroom criteria, preventing biological growth and cross-contamination.
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GJB Military Standard
Military Protection Skid
Corrosion-resistant absorption units built to military standards, preserving ordnance, guidance packages, and hardware across severe marine and field conditions.
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ATEX / Hazardous Zone
Petrochemical Vapor Recovery
Explosion-proof condensed oil gas absorption systems tailored for fuel storage depots, loading docks, and petrochemical processing facilities.
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Direct Hangzhou Factory Partnership
Request Technical Sizing, Rotor Drawings, & Factory Quotations
Connect directly with our senior HVAC engineers in Hangzhou. Share your targeted room dimensions, fresh air load, sensible heat gains, and dew point targets for a customized psychrometric simulation within 24 business hours.