DP -70°C
DHU Rotary Desiccant Dehumidifier
Controls supply air down to -70°C dew point with continuous rotor regeneration for hyper-controlled dry rooms.
TeslaNorthvoltCATLATLBYDEVE EnergyFarasisEnvisionSVOLTTTI
TeslaNorthvoltCATLATLBYDEVE EnergyFarasisEnvisionSVOLTTTI
Flagship Environmental Equipment
Engineered Product Lines Under Banner
Proven rotary desiccant dehumidifiers, agricultural bulk curing suites, battery dry rooms, and VOC systems delivered with CE, UL, CSA, ASME, and EAC certifications.
DP -70°C
Turnkey EPC
Turn-key Dry Room System
End-to-end engineered enclosure, low-leakage wall envelopes, cleanroom integration, and automated climate consoles.
Recovery ≥99%
ZJRH NMP Solvent Recovery System
Captures solvent vapors on high-throughput continuous processing lines, achieving verified recovery rates above 99%.
Condensation + RTO
Industrial VOC Abatement System
Regenerative Thermal Oxidation (RTO) and deep cryogenic condensing systems for heavy exhaust odor and chemical scrubbing.
Industrial Airflow
Desiccant Dehumidifier Unit (DHU)
Designed for food processing, hygroscopic storage, and chemical powder preservation to completely eliminate condensation.
Zero-Odor Clean Air
Multi-Stage VOC Abatement Scrubbers
Advanced agricultural & chemical plant emission controls preventing ambient sulfurous and volatile aromatic discharge.
Waste Heat Recovery
Closed-Loop NMP Recovery & Reuse
Integrated thermal exchangers that recycle heat directly back into the drying chambers, minimizing boiler consumption.
Smart Chamber
Industrial Turn-Key Drying Chambers
Pre-engineered structural dry rooms equipped with automated air curtains, dehumidification rotors, and psychrometric sensors.
E-E-A-T White Paper Analysis
Macro Industry Solutions: Precision Onion Curing & Dehydration
Resolving the critical physiological bottlenecks of mass Allium processing through psychrometric stability, latent moisture stripping, and VOC odor management.
Latent Heat Load & Neck Drying
Fresh onions arrive at factories containing 85% to 90% water content. Traditional curing rooms often suffer from moisture stagnation, causing fungal neck rot (Botrytis allii). DryAir precision chambers provide high-CFM dry air streams that seal the onion neck within 48 hours without thermal scorch.
Color Preservation & Pyruvate Control
Commercial onion dehydrators producing kibbled, minced, or powdered onion require exact temperature control under 60°C to preserve pungency (pyruvate acid levels) and eliminate enzymatic browning. Our desiccant systems strip moisture at lower temperatures to preserve natural white/gold pigments.
Sulfur Odor & Exhaust VOC Scrubbing
Processing tens of metric tons of raw onions emits intense organic sulfur compounds like allicin and diallyl disulfide. DryAir integrates its patented VOC abatement scrubbers directly into the factory exhaust, condensing and treating pungent odor vapors before stack discharge.
Manufacturing Depth
China Factory 4.0: Supply Chain Resilience & Efficiency
Based in Hangzhou’s high-tech manufacturing corridor, DryAir unites in-house rotor synthesis, CNC enclosure engineering, and rigorous military-grade quality protocols.
200+ Units Monthly
A 35,000+ m² smart factory infrastructure capable of manufacturing more than 200 heavy desiccant units each month with complete vertical integration.
GJB Military Quality
Operating under ISO 9001 and China's GJB national military manufacturing standard, guaranteeing zero structural leakage and continuous 24/7 reliability.
74 In-House Specialists
Our engineering backbone consists of 6 PhDs/Masters, 2 national registered HVAC engineers, and 8 senior thermal system consultants.
Sub-Component Supply
Unmatched Chinese supply chain clustering ensures immediate availability of high-grade stainless sheets, blowers, and silica-gel honeycomb cores.
-70°C
Supply Dew Point
≥99%
Solvent Recovery
30%+
China Market Share
200+
Units Monthly Output
2010
Year Established
Strategic Roadmap 2025–2030
Addressing Global Enterprise Procurement Requirements
International food processors and battery conglomerates demand auditable carbon-neutral operations, predictive maintenance, and rock-solid international certification.
Waste-Heat Regeneration Integration
By recovering latent energy from factory boiler return loops or compressor jacket heat, DryAir's next-generation systems slash desorption electrical usage by up to 42%, lowering Scope 1 & 2 emissions across large-scale drying facilities.
IoT Twin & Predictive Rotor Health
Cloud-connected PLC consoles continuously stream dew point drifts, pressure drops across the desiccant wheel, and blower vibration diagnostics. AI forecasting flags maintenance before moisture excursions impact delicate onion curing or battery assembly.
HACCP, FDA & GMP Food Safety
Manufactured using food-grade SUS304/SUS316 stainless interior paneling with clean-in-place (CIP) washable biological filtration. DryAir guarantees sterile, spore-free airflow meeting international food safety criteria.
| Target Application | Standard Dew Point | Relative Humidity (RH) | Key Recommended Architecture | Factory Impact |
|---|---|---|---|---|
| Onion Curing & Neck Drying | +5°C to +10°C DP | 55% – 65% RH | High-CFM Desiccant + Thermal Recuperator | Stops Botrytis mold; cures skins in 48 hrs |
| Dehydrated Onion Flake/Powder Milling | -10°C to -20°C DP | 15% – 25% RH | Low-Dew-Point Rotary Dehumidifier (DHU) | Eliminates agglomeration, stickiness & hopper clogs |
| Li-ion Cell Assembly & Electrolyte Filling | -40°C to -60°C DP | <1% RH | Turnkey Sealed Dry Room + Dual-Rotor System | Prevents toxic HF creation and battery fire hazard |
| Next-Gen Solid State & Li-Metal R&D | Down to -70°C DP | Ultra-Trace Vapor | Multi-Stage Molecular Sieve Desiccant | Maintains chemical stability of reactive metal anodes |
| Factory Sulfide / NMP Solvent Exhaust | Emission Limits | Controlled Flow | Cryogenic Condenser + RTO Abatement System | ≥99% VOC solvent recovery; compliant clean exhaust |
Global Field Engineering
Localization, International Compliance & Engineering Support
Delivering turnkey peace of mind through global certifications, rapid on-site commissioning, and continuous parts fulfillment worldwide.
Full Global Certification
DryAir equipment can be tailored with CE (Europe), UL/CSA (North America), ASME boiler/pressure vessel approvals, and EAC (Eurasian Union) certifications, ensuring smooth local electrical and fire inspections.
On-Site EPC Erection
Our senior commissioning specialists deploy directly to your facility in North America, Europe, Southeast Asia, or the Middle East to supervise chamber sealing, duct balancing, and psychrometric validation testing.
Optional 2-Year SLA Warranty
International clients can secure an optional 2-year end-to-end extended service warranty covering immediate flight dispatch of field technicians, 24-hour remote PLC access, and prioritized spares inventory stocking.
Expert Answers
Frequently Asked Questions by Global Engineering Teams
Direct technical clarifications on onion drying dynamics, battery dry room dew points, energy consumption, and equipment lead times.
What is the advantage of desiccant dehumidification over refrigeration in an onion factory?
Refrigeration dehumidifiers freeze up and lose moisture-removal capacity when ambient air drops below 15°C. In contrast, DryAir rotary desiccant dehumidifiers utilize silica-gel rotors that absorb moisture chemically, allowing precise humidity reduction down to 10% RH even at freezing temperatures without frost accumulation. This prevents onion rotting and preserves structural pungency during cold-season harvest.
What is the lowest dew point a DryAir desiccant dehumidifier can reach?
DryAir rotary desiccant systems can achieve a minimum controllable supply dew point of -70°C. This level of extreme dry climate is mandatory for advanced lithium-metal pouch cell assembly, solid-state battery electrolytes, and high-potency API pharmaceutical powder milling.
Can DryAir build full turnkey cleanrooms outside China?
Yes. We execute complete Turn-key EPC projects covering initial consultation, thermal load simulation, modular enclosure wall fabrication, AHU integration, on-site mechanical erection, and ISO cleanroom certification. Our engineering teams have completed overseas installations for Tesla, Northvolt, and TTI.
How does your VOC abatement system handle heavy organic sulfur odors?
Our multi-stage VOC abatement systems utilize initial condensation separation to capture condensable volatile oils, followed by chemical neutralization or high-efficiency Regenerative Thermal Oxidation (RTO) which incinerates volatile organic compounds at 760°C+, converting pungent sulfurous exhaust into clean, odorless gas.
What export certifications are provided with shipments?
DryAir units can be configured and stamped with European CE directives, UL and CSA compliance markings for the US and Canadian jurisdictions, ASME pressure standards for recovery vessels, and EAC clearance for Eurasian partners.
What is the solvent recovery rate of the ZJRH NMP system?
Our proprietary NMP recovery systems reliably attain solvent recovery efficiencies ≥99% on continuous lithium battery electrode coating lines, drastically reducing solvent repurchase expenditures while safeguarding operator safety.
Product Portfolio
Explore Our Full Range of Environmental Systems
Select from industrial dehumidifiers, customized food dehydrator rooms, and regenerative VOC plants. Click any solution to examine technical specifications.
Rotary Core
Industrial Desiccant Dehumidifier
Reliable moisture stripping down to ultra-low dew points for seed drying, onion curing, and aerospace hangars.
Single-Source EPC
Turn-key Dry Room System
Complete clean-room envelope, duct distribution networks, low-leak vestibules, and automated temperature/humidity consoles.
≥99% Efficiency
NMP Recovery System
Engineered condensation stages designed for battery electrode lines to minimize hazardous chemical venting.
RTO Technology
VOC Abatement Systems
High-efficiency thermal oxidation eliminating odors, toxic vapors, and solvent exhaust to satisfy clean-air standards.
Continuous Air
Commercial Desiccant Dehumidifier
Designed for hygroscopic materials, cold-storage warehouses, and spice packing lines requiring year-round dew point stability.
Hydrocarbon Control
Condensation Exhaust Treatment
Refrigerated vapor recovery condensing heavy chemical exhausts and aromatic organic compounds at bulk shipping docks.
Continuous Duty
Advanced NMP Recirculation Units
Engineered for high-throughput 24/7 electrode factories to reduce fresh solvent purchase costs and environmental footprints.
GMP Ready
Pharma & Food Grade Dry Rooms
Strict microbial-compliant air handling rooms with automated HEPA filtration and sanitary ducting designed for onion processing.
Direct Factory Sourcing
Upgrade Your Onion Processing & Dry Room Operations
Connect directly with Hangzhou DryAir’s thermal and dehumidification engineering group. Request full psychrometric load calculations, airflow schematics, and an end-to-end quotation.