DP -70°C
DHU Series Low Noise Rotor Dehumidifier
Engineered for continuous moisture adsorption down to -70°C dew point featuring double-skin acoustic insulated panelling and EC plug fan propulsion.
View SpecificationsDryAir Core Industrial Dehumidification Lineup
Ultra-low acoustic signature dehumidifiers, deep-dewpoint rotors, and solvent recovery systems certified under CE, UL, CSA, ASME, and EAC standards.
DP -70°C
Turnkey EPC
Turnkey Cleanroom Dry Room System
Integrated architectural enclosure and air balance solutions optimized for lithium cell winding, electrolyte injection, and packing zones.
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Recovery ≥99%
ZJRH Series NMP Solvent Recovery System
Recaptures hazardous N-Methyl-2-pyrrolidone vapors on cathode coater oven exhausts, dropping OPEX and factory emissions significantly.
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Deep Cooling + RTO
Industrial VOC Abatement & RTO Unit
Dual-stage cryogenic condensation combined with regenerative thermal oxidizers to purify noxious hydrocarbon waste streams cleanly.
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Dual-Rotor Design
Multi-Stage Silica-Gel Zeolite Rotor AHU
Cascade adsorption system with internal heat recovery exchangers configured specifically for extreme tropical humidity climates.
Technical Data Sheet
Ultra-Low Leakage
Lithium Pilot-Line Compact Dry Room
Pre-engineered modular enclosure delivered with integrated silencers and vibration-damped floor plates for R&D battery facilities.
Project Case Studies
High COP Cooling
Heavy-Duty Refrigerative Dehumidifier
Economical bulk moisture extraction for large dry warehouses, bulk pharmaceutical material silos, and marine shipyard prep.
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ATEX / Class 1 Div 2
Explosion-Proof Industrial Emission Absorber
Gas condenser skid systems designed to meet rigorous GJB defense standards and international hazardous zone electrical compliance.
Compliance ManualAudited Engineering Capability & Market Footprint
Operational data validated by global supply chains including Tesla, CATL, Northvolt, BYD, and EVE Energy.
-70°C
Minimum Controlled Supply Dew Point
≥99%
NMP Solvent Recovery Purity & Capture
30%+
Market Share in China's Giga-Dryrooms
200+
AHU Units Manufactured Monthly
74+
PhDs, HVAC Engineers & Technical Specialists
Technical Whitepaper: Acoustic Engineering in Modern Desiccant Systems
Why China's advanced supply chain cluster is outperforming traditional Western rotary manufacturers in energy density and low-noise compliance.
Industrial rotary desiccant dehumidifiers historically suffered from substantial acoustic and aerodynamic penalties. The high static pressure required to force substantial air volumes through densely packed, synthesized honeycomb matrices—typically impregnated with metal silicate or PPS zeolite substrates—generates immense boundary layer turbulence. When coupled with large reactivation blowers exhausting heated air at temperatures between 120°C and 140°C, legacy installations frequently exceeded 85 to 92 dBA. This created harsh operational environments requiring separated machine halls, heavy concrete baffles, and lengthy ductwork that exacerbated thermal bleed and increased fan static pressure losses.
"Modern precision production facilities—especially next-generation solid-state battery dry rooms and pharmaceutical sterile suites—demand environmental noise floors below 68 dBA at 1 meter. Achieving this without sacrificing dynamic adsorption kinetics requires redesigning the internal fluid dynamics, acoustic damping chambers, and dynamic balancing mechanisms of the rotor cassette."
The Manufacturing Advantages of Hangzhou DryAir Treatment Co., Ltd.: Operating from our advanced fabrication center in Qingshan Industrial Park, Hangzhou, DryAir has mastered the confluence of localized supply networks, aerospace-grade machining, and military-standard quality control (GJB system). China’s hyper-efficient industrial ecosystem enables DryAir to integrate custom backward-curved centrifugal fans with aerodynamically contoured bellmouth entries, precision dynamic rotor balancing, and high-transmission synchronous cogged belts at a significantly lower capital cost than Western European or North American competitors. This localization allows global buyers to acquire high-specification, low-noise systems with 35% to 45% faster lead times and lower total cost of ownership (TCO).
Aerodynamic Acoustic Damping
Double-skin casing filled with high-density rock wool (50mm–100mm) combined with internal Helmholtz micro-perforated sound attenuators dampens structural reverberation to <68 dBA.
Zeolite-Silica Composite Matrix
In-house synthesized non-flammable inorganic honeycomb wheels deliver exceptional moisture sorption selectivity down to -70°C dew point without releasing chemical aerosols or dust.
Integrated Waste Heat Reactivation
Optional heat-pipe exchangers, condensator recycling modules, and flue gas interfaces reduce electric regeneration energy consumption by up to 32% during steady-state runs.
Macro Environmental Solutions Across Regulated Industries
Tailored psychrometric calculations mitigating hygroscopic degradation, corrosion, and organic vapor cross-contamination.
Gigafactory Lithium-Ion & Sodium-Ion Battery Dry Rooms
Electrolyte salts like lithium hexafluorophosphate (LiPF6) react aggressively with trace moisture in the ambient air, yielding hydrofluoric acid (HF), destroying active cathode chemistry, and posing major safety risks. DryAir provides turnkey modular enclosures engineered with positive pressure management and continuous supply air down to -40°C ~ -70°C dew point. By utilizing ultra-low noise rotor systems, these immense air handlers can be positioned closer to cell assembly bays, reducing static pressure run losses and simplifying air distribution ducting.
Pharmaceutical Cleanrooms & Hygroscopic Processing
In effervescent tablet pressing, gelatin capsule bonding, and active pharmaceutical ingredient (API) powder conveyance, relative humidity fluctuating above 20% RH causes powder agglomeration, nozzle clogging, and bacterial incubation. DryAir desiccant dehumidifiers adhere to stringent GMP and FDA design principles, providing washable bactericidal rotor coatings, continuous condensate elimination, and low operational vibration that will not disturb delicate analytical balances in adjacent quality control laboratories.
Defense, Avionics & Deep-Sea Vessel Storage (GJB Standard)
Built under Chinese GJB national military quality systems, our military-grade dehumidifiers deliver corrosion-free preservation for missile silos, radar avionics bays, ammunition arsenals, and naval hulls. These systems maintain relative humidity strictly below 40% RH, neutralizing oxidation reactions without requiring toxic oil coatings or labor-intensive grease wrapping. The low acoustic footprint prevents acoustic tracking detection in sensitive applications.
Semiconductor Photolithography & Cleanroom Processing
Microelectronic sub-micron chip lithography processes degrade if relative humidity wanders by even ±1.5%. Micro-condensation on wafers creates oxidation layer bridging and circuit shorts. DryAir’s multi-rotor systems balance tight ±1% RH tolerance with continuous particulate-free laminar airflow, eliminating rotor fiber shedding through thermally cured ceramic-matrix bounding agents.
Comparative Dew Point & Noise Optimization Selection Matrix
Psychrometric target metrics by industrial application to assist EPC project managers and procurement engineers.
| Target Application | Required Dew Point / RH | Recommended Machine Architecture | Acoustic Noise Index (1m) | Certification Options |
|---|---|---|---|---|
| Lithium Cell Assembly & Winding | -40°C to -60°C DP | Turnkey Double-Rotor System + Deep Cooling | ≤ 68 dBA | CE, UL, CSA, EAC |
| Lithium-Metal / Solid-State Lines | Down to -70°C DP | Triple-Stage Zeolite Desiccant Skid | ≤ 70 dBA | CE, UL, ASME |
| Electrode Slurry Coating & Drying | ≥99% Solvent Recovery | ZJRH Series NMP Condensation System | ≤ 72 dBA | CE, ATEX, EAC |
| Hygroscopic Pharma Packaging & API | 10% to 25% RH | Hygienic DHU Silica-Gel Rotor Unit | ≤ 65 dBA | GMP, CE, ISO 9001 |
| Ammunition & Military Logistics | ≤ 35% RH | GJB-Spec Ruggedized Desiccant System | ≤ 66 dBA | GJB National Defense |
| General Warehouse Pre-Conditioning | 45% to 60% RH | Industrial Refrigerative Dehumidifier | ≤ 64 dBA | CE, ISO 9001 |
| Chemical Petrochemical Exhaust | Strict VOC Emission Limits | Deep-Cooling Condenser + RTO System | ≤ 75 dBA | ASME, Explosion-Proof |
International Procurement Engineering & Turnkey EPC Workflow
How Hangzhou DryAir mitigates overseas project risks through end-to-end consulting, factory witness testing, and localized field commissioning.
Phase 1: Psychrometric Load Audit
We analyze sensible heat loads, structural air infiltration rates, door cycling intervals, and personnel perspiration indices to compute precise moisture loads (kg/h), ensuring equipment is accurately sized.
Phase 2: Thermodynamic Modeling
Engineers formulate CFD airflow velocity models, structural thermal bridge profiles, and dynamic acoustic absorption pathways to eliminate dew point dead zones and noise pockets inside the plant.
Phase 3: In-House Factory Testing (FAT)
Every rotor module undergoes factory run trials in our certified testing chambers. Real-time mass spectrometer leak checks and acoustic decibel array scans verify zero structural air cross-leakage prior to export packing.
Phase 4: Global Export Logistics & Erection
Modularized air-handling segments with nitrogen-purged preservation are shipped to site under seaworthy packaging. Our factory-certified mechanical and electrical specialists oversee mechanical rigging and panel joint sealing.
Phase 5: Site Acceptance Testing (SAT)
On-site validation measures supply air dew point stability across 72 hours of uninterrupted dynamic production. Sensor data is calibrated against chilled-mirror reference hygrometers to confirm specification compliance.
Phase 6: Optional 2-Year International Care
Foreign owners can select our extended two-year comprehensive SLA, encompassing IoT remote telemetry analytics, scheduled rotor seal replacements, emergency parts consignment, and bi-annual engineering audits.
Frequently Asked Questions by Global EPC & Procurement Managers
Clear, auditable engineering clarifications regarding rotor longevity, regeneration efficiency, low noise design, and overseas warranty validation.
How does Hangzhou DryAir achieve low noise operation (<68 dBA) in high-capacity desiccant systems?
Low noise performance is achieved through three integrated features: First, we employ aerodynamically balanced direct-drive plug fans with backward-curved 3D impeller blades and electronically commutated (EC) motors, avoiding belt slip noise. Second, our casing uses a double-skin 50mm–100mm thermally broken panel architecture packed with acoustic attenuation rockwool (density > 80 kg/m³). Third, specialized silencer baffles and discharge plenum acoustic splitters reduce air turbulence at the supply and regeneration exhaust ducts.
What is the lowest controllable dew point achievable on a continuous industrial scale?
Hangzhou DryAir rotary desiccant dehumidifiers can reliably control process supply air down to -70°C dew point (equivalent to less than 0.002 g/kg moisture content). This performance is achieved through our multi-rotor cascade system, where air is pre-cooled and partially dried by a primary rotor before passing through a secondary deep-dewpoint zeolite adsorption rotor.
Do you deliver complete turnkey battery dry rooms outside of mainland China?
Yes. DryAir provides turnkey dry room engineering internationally, covering load analysis, enclosure architectural design, modular manufacturing, global shipping, on-site mechanical erection, electrical wiring, PLC control integration, and dew point validation. We have successfully completed turnkey installations for world-class tier-one manufacturers including Tesla, Northvolt, and TTI across Europe and North America.
Which international electrical and pressure vessel codes do your systems comply with?
Depending on destination requirements, DryAir units are engineered to comply with CE directives (Low Voltage, Machinery, EMC, ATEX), UL/cUL standards for the North American market, CSA standards for Canada, ASME codes for steam and thermal fluid heat exchangers, and EAC certification for the Eurasian Economic Union. Our factory operates under ISO 9001 and China's GJB national military standard quality management systems.
What is the design lifespan of DryAir desiccant rotors, and can they be washed?
Under regular operational conditions and proper pre-filtration (standard G4 + F8 pre-filters), DryAir desiccant rotors provide an operating lifespan of 8 to 12 years. The inorganic honeycomb silicate and synthesized zeolite matrices are structurally bound, meaning they can be gently washed with clean water and mild non-alkaline detergent to remove accumulated airborne dirt without stripping active desiccant compounds.
How does the ZJRH NMP Solvent Recovery System achieve ≥99% capture efficiency?
The ZJRH system combines multi-stage deep cooling condensation with a specialized secondary rotor absorption cycle. The coater exhaust air is progressively cooled in gas-to-gas heat exchangers and chilled glycol coils, condensing the bulk of the NMP solvent. The remaining trace gas stream is routed through a hydrophobic rotor concentrator that captures residual vapors down to single-digit ppm, achieving overall recovery efficiency exceeding 99%.
What ongoing support and warranty frameworks exist for international purchasers?
International clients receive 24/7 remote IoT telemetry diagnostic support, direct video engineering assistance, and rapid parts dispatch. In addition to our standard factory warranty, clients can contract our extended two-year overseas service agreement, which includes scheduled physical inspections, sensor calibrations, and preventative maintenance conducted by certified DryAir service engineers.
Complete Industrial Desiccant & Turnkey Portfolio
Explore model configurations, airflow ratings, and technical literature for all DryAir heavy-duty industrial installations.
Low Vibration
Standard DHU Rotary Dehumidifier
Designed for low-noise continuous operations with direct-coupled EC blowers and precision dual-perimeter bulb seal strips.
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ISO Clean 5-7
Battery Cell Turnkey Dry Room Enclosure
Airtight cleanroom envelopes with integrated airlocks, emergency vapor vents, and low-energy variable air volume circulation.
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High Purity
Electrode Coating NMP Recovery Skid
Advanced condensation columns designed to return ultra-pure liquid NMP while keeping stack emissions below local thresholds.
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VOC Abatement
Deep-Cooling VOC Abatement Chamber
Refrigerative condensed hydrocarbon capture designed for chemical bulk facilities, fuel storage terminals, and adhesive manufacturing.
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Energy Efficient
Refrigerative High-Capacity Dehumidifier
Cost-effective initial moisture strip units designed to pre-condition humid outdoor makeup air before desiccant treatment.
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Monthly 200+ Units
Custom Large-Scale Rotor Modules
Custom-dimensioned air-handling units manufactured to match legacy building constraints and specific cleanroom duct heights.
Custom Engineering
Acoustic Insulated
GMP Pharmaceutical Hygiene Dehumidifier
Stainless-steel interior panels with flush inspection doors and washdown-safe drains engineered for sanitized API cleanrooms.
Pharma Portfolio
Worldwide Support
Turnkey Modular Environmental Plant
Skid-mounted and pre-wired desiccant stations designed for fast overseas integration and plug-and-play field hookups.
EPC Consultation
Direct Factory Engineering Dialogue
Request a Comprehensive Psychrometric Sizing & Acoustic Calculation
Our senior HVAC design engineers will review your air volume, moisture load, noise thresholds, and site utility parameters, delivering full system layouts and cost proposals within 24 hours.