DP -70°C
Desiccant Dehumidifier
DHU series rotary desiccant dehumidifiers deliver stable ultra-low-dew-point conditions down to -70°C where standard chillers fail.
Engineered Industrial Equipment
State-of-the-Art Dry Room & Humidity Abatement Systems
Explore our flagship environmental processing units engineered for extreme dew point stabilization, VOC thermal abatement, and high-efficiency closed-cycle solvent recovery.
DP -70°C
Turnkey EPC
Turn-key Dry Room System
Modular clean dry enclosures featuring high airtightness, airlock integration, advanced HVAC piping, and full PLC automation.
Purity ≥99%
NMP Recovery System
Industrial condensation and zeolite rotor concentration systems designed to capture solvent vapors on battery coating lines.
RTO Thermal
VOC Abatement System
Combining deep-cooling condensation and Regenerative Thermal Oxidation (RTO) to achieve zero-emission exhaust standards.
High COP
Refrigerative Dehumidifier
High-efficiency mechanical condensation equipment for warehouse environmental control and primary stage pre-cooling.
Rotor Core
Low Dew Point Rotor Core
Synthetic honeycomb molecular sieve rotors capable of absorbing moisture across extreme ambient relative humidity swings.
Energy Save
Electrode Coating Loop
Integrated heat recovery systems reducing thermal energy expenditure on continuous cathode coating lines by over 40%.
Hazardous
Oil & Gas Recovery Unit
Explosion-proof volatile solvent collection assemblies configured for high-hazard petrochemical loading operations.
Industry White Paper Analysis
The Global Industrial Landscape & The Rise of China's Dry Room Leadership
As the global shift toward electromobility, grid-scale energy storage, and solid-state batteries accelerates, environmental microclimate precision has transitioned from an auxiliary utility to the single most critical quality determinant.
Gigafactory Expansion Realities
Global lithium-ion manufacturing capacity is racing past 3 TWh. Each gigawatt-hour (GWh) requires an engineered air handling volume exceeding 50,000 to 100,000 m³/h at dew points rigidly clamped between -40°C and -60°C. Legacy HVAC architectures are economically untenable under these operational loads.
Unprecedented Volume ScaleThermodynamic OPEX Bottlenecks
Dry room dehumidification systems consume up to 35%–43% of total electrical energy in cell production plants. High thermal regeneration loads demand cutting-edge waste heat integration, dual-rotor staging, and specialized condensation coils to lower operating expense per cell.
Thermal Efficiency ImperativeChina's Operational Dominance
China supplies over 75% of global lithium cell components. Consequently, Chinese dry room equipment manufacturers possess unmatched field validation across hundreds of operating gigawatt facilities, driving rapid iteration that outpaces traditional Western providers.
Global Supply Chain Hub
Manufacturing Prowess & E-E-A-T
Hangzhou DryAir: Unrivaled Engineering Depth & Chinese Factory Efficiency
Established in 2010, Hangzhou DryAir Treatment Co., Ltd. has grown into one of China's top three industrial dehumidification giants, capturing more than 30% of the domestic market and pioneering international deliveries.
74 Technical Specialists
Our multidisciplinary R&D corps includes 6 PhD and master's degree holders, 2 national registered HVAC engineers, 8 senior engineers, and 58 certified cleanroom and low-dewpoint field technicians.
High-Caliber HVAC TalentGlobal Delivery Track Record
Proven execution delivering mission-critical projects for Tesla, Northvolt, TTI, CATL, and BYD. All systems fully comply with CE, UL, CSA, ASME, and EAC standards for fast-track local permitting.
Tier-1 International ComplianceMassive 200+ Unit/Mo Capacity
Headquartered in Lin'an, Hangzhou across our specialized manufacturing base, we produce more than 200 large-scale dehumidifiers and solvent recovery skids every month, guaranteeing on-time multi-phase gigafactory ramp-ups.
Scalable Factory Throughput-70°C
Minimum Stable Dew Point
≥99%
NMP Solvent Recovery
30%+
National Market Share
200+
Units Fabricated Monthly
2010
Year Established
Sector-Specific Environments
Specialized Applications: Zero Moisture Failure Tolerance
Different processes exhibit varied sensitivities to airborne moisture. Hangzhou DryAir tailors mechanical refrigeration and desiccant regeneration profiles to address specific process physics.
-40°C ~ -70°C DP
Lithium & Solid-State Batteries
Moisture ingress causes lithium hexafluorophosphate (LiPF6) to hydrolyze into toxic hydrofluoric acid (HF), causing cell swelling and capacity fade. We protect electrode winding, electrolyte filling, and cell formation zones with surgical precision.
GMP Grade 10-30% RH
Pharmaceutical & Biotechnology
Prevent caking of hygroscopic powders, protect soft gelatin capsule integrity, and ensure stable effervescent tablet compression. Our systems maintain strict cGMP/FDA compliant moisture control across all packaging suites.
GJB Military Standard
Military & Aerospace Defense
Engineered under national GJB military standards to defend avionics, missile guidance systems, optoelectronics, and munitions from internal corrosion, dielectric breakdown, and mold during strategic storage.
Turnkey Project Execution
Turnkey EPC Delivery: From Psychrometric Audit to Commissioning
Eliminating contractor friction, Hangzhou DryAir executes under a unified turnkey model. We take complete responsibility for enclosure envelope performance, HVAC balancing, and continuous -70°C dew point compliance.
Consulting & Load Audit
Deep review of process layout, personnel latent moisture, door open cycles, and room infiltration tolerances.
Psychrometric Engineering
Custom rotor air balance calculations, waste heat loop integration, and ductwork CFD velocity modeling.
In-House Fabrication
Full skid manufacture, airtight panel production, and automated testing inside our state-of-the-art testing room.
Erection & Commissioning
Experienced on-site installation engineers supervise airtight sealing, chilled water hookup, duct pressurization, and calibration.
Service & Global Support
Continuous monitoring, optional 2-year full warranty protection, rapid spare parts deployment, and remote IoT diagnostics.
Technical Benchmark Matrix
Buyer's Dew Point Selection & Process Matching Guide
Over-specifying humidity margins drastically inflates capital and energy expenditures; under-specifying compromises product quality. Leverage our certified baseline target parameters.
| Application Sector | Critical Process Stage | Target Environmental Dew Point | Recommended System Hardware |
|---|---|---|---|
| Lithium Battery | Cell Assembly, Stacking & Electrolyte Injection | -40°C to -60°C DP | Turnkey Battery Dry Room System |
| Solid-State Cells | Sulfide Electrolyte Processing & Li-Metal Handling | Down to -70°C DP | Low-DP Dual Rotor Desiccant Skid |
| Electrode Fabrication | Cathode Slurry Coating & Continuous Drying Oven | ≥99% NMP Recovery / Low LEL | ZJRH High-Efficiency NMP Unit |
| Pharmaceutical | Tableting, Gelatin Encapsulation & Sterile Powder | 10% to 30% RH (DP -5°C to -15°C) | Hygienic Desiccant Dehumidifier |
| Military & Defense | Munitions Depots, Avionics & Strategic Ordnance | ≤40% RH (Non-condensing) | GJB-Spec Military Environmental Unit |
| General Industrial | Chemical Warehousing & Primary Pre-cooling | 45% to 60% RH | Industrial Refrigerative Dehumidifier |
| Petrochemical Terminals | Fuel Storage Loading, Tank Venting & Oil/Gas Vapor | Strict Local VOC Emission Limits | Deep Condensation + RTO Systems |
Engineering Insights
Technical Articles & Thermal Physics White Papers
Authored by our chief engineers: field observations, psychrometric control analysis, and solvent recovery efficiency guides.
VOC Treatment
How Oil Gas Condensation Recovery Systems Work
A thermodynamic review of mechanical cascaded chillers, primary condensation coils, and secondary carbon adsorption loops during bulk hydrocarbon transfers.
NMP Recovery
Maintaining Stable NMP Solvent Recovery In Continuous Ops
Examining condensation dewpoint stability, wheel regeneration thermal efficiency, and water separation techniques to achieve continuous ≥99% solvent recovery.
GMP Humidity
Preventing Latent Moisture Degradation in Pharma
From fine API powder blenders to fluid bed dryers and blistering rooms: how slight relative humidity spikes cause hydrolytic active ingredient decay.
Procurement Knowledgebase
Frequently Asked Questions (FAQ) for Global Buyers
Clear, audited answers to questions raised by international EPC contractors, plant directors, and HVAC procurement leads.
What is the lowest certified dew point Hangzhou DryAir equipment can maintain?
Hangzhou DryAir rotary desiccant dehumidifiers reliably achieve and continuously maintain a supply air dew point of -70°C (equivalent to less than 0.0033 grams of moisture per kilogram of dry air). This satisfies the stringent microclimate prerequisites for high-nickel NMC 811 cathode processing, solid-state sulfide electrolyte handling, and lithium foil pouch cell assembly.
Do you deliver complete turnkey battery dry room systems internationally?
Yes. DryAir provides complete turnkey EPC execution across Europe, North America, Southeast Asia, and beyond. Our turnkey package encompasses front-end engineering design (FEED), structural airtight envelope panels, low-leakage airlocks, modular desiccant skids, PLC building management system (BMS) integration, on-site mechanical erection, commissioning, and final ISO cleanroom dew point certification.
Which international certifications and safety standards do your machines carry?
All overseas units can be manufactured to conform strictly to CE (Machinery & Low Voltage Directives), UL 1995/UL 60335 standards for North America, CSA specifications for Canada, ASME code for pressure vessels and heat exchangers, and EAC certifications for Eurasian customs markets. In addition, our manufacturing operations run under certified ISO 9001 and the GJB national military standard quality system.
What solvent recovery efficiency does the DryAir NMP system guarantee?
Our ZJRH series NMP (N-Methyl-2-pyrrolidone) recovery systems are guaranteed to achieve a solvent recovery rate of ≥99% from cathode coater oven exhaust. The recovered liquid maintains minimal moisture contamination, drastically slashing new solvent procurement spend and cleanly fulfilling regional VOC emission thresholds.
What after-sales service and remote support options exist for plants outside China?
International customers benefit from our comprehensive global support infrastructure: remote telemetry monitoring via encrypted cloud connections, on-demand field dispatch of commissioning engineers, expedited strategic spare parts shipments, and an optional 2-year extended overseas service agreement. Please visit our Global Service portal for details.
Complete Hardware Suite
Explore Our Full Range of Precision Climate Solutions
Review our comprehensive portfolio of desiccant rotors, VOC oxidizers, solvent recovery towers, and modular dry rooms engineered for demanding industrial processes.
Industrial Grade
Custom Desiccant Skid
Multi-stage desiccant rotor assembly paired with face-and-bypass dampers for dynamic sensible and latent heat balance.
Airtight PIR/PUR
Turnkey Dry Room Enclosure
High-density rockwool and PIR insulated cleanroom wall systems featuring airtight cam-locks and recessed HEPA terminal plenums.
Continuous Cycle
NMP Solvent Distillation Unit
Auxiliary distillation and purification packages that upgrade recovered wet NMP solvent to battery-grade purity levels on-site.
99.5% DRE
Industrial 3-Bed RTO
Regenerative Thermal Oxidizer achieving >99.5% Destruction Removal Efficiency (DRE) with integrated ceramic media bed heat traps.
Water-Cooled
Direct Expansion Pre-Cooler
Heavy-duty scroll condensing packages tailored for high-humidity coastal climates to strip initial sensible moisture loads.
Factory Tested
Custom Air Handling (AHU)
Double-skin casing with thermal break design, variable frequency direct-drive plug fans, and stainless steel condensate pans.
Ex-Proof
Vapor Recovery Unit (VRU)
Cold-box condensation system engineered to recover valuable gasoline, aromatics, and volatile petrochemical vapors at loading racks.
Dual Stage
Dual-Rotor Ultra-Dry System
Cascaded two-rotor design engineering an extreme low-dewpoint environment (-65°C to -70°C) with optimized regeneration power input.
Accelerate Your Plant Architecture
Request an Engineering Consultation & System Catalog
Provide your cleanroom dimensions, targeted operating dew point, process exhaust volumes, and utility constraints. Our registered HVAC engineering team will deliver a customized thermal model and equipment proposal within 24 hours.