DP -70°C
Desiccant Dehumidifier
DHU series rotary desiccant units delivering supply air down to -70°C dew point for lithium battery dry rooms and precision military storage.
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Product Catalog Section A
High-Efficiency Dehumidification & Recovery Equipment
Engineered for mission-critical low dew point process humidity control, VOC mitigation, and solvent recovery across precision industrial facilities worldwide.
DP -70°C
EPC Turnkey
Turn-key Dry Room System
Full engineering enclosure, ducting distribution, deep drying air handlers, and multi-sensor automated PLC controls for cell factories.
Dry Room Engineering
Recovery ≥99%
NMP Recovery System
ZJRH series capturing N-Methyl-2-pyrrolidone from cathode coating exhaust lines, reducing raw material procurement costs and emissions.
NMP Recovery Details
Cooling + RTO
VOC Abatement System
Integrated deep-cooling condensation combined with regenerative thermal oxidizers (RTO) for chemical plants and oil vapor stripping.
Abatement Solutions
Energy Eco
Refrigerative Dehumidifier
Economical bulk moisture extraction for material warehouses, workshops, and pre-cooling stages before low dew point rotors.
Refrigerative Models
Ultra Dry
Battery Cell Assembly Dry Room
Engineered clean environmental pods maintaining -45°C to -65°C dew points during electrolyte injection and ultra-pure winding.
Battery Pod System
Eco Condense
Oil Gas Recovery Condenser
Designed for chemical storage farms and hydrocarbon terminals to condense volatile organics, avoiding environmental atmospheric release.
Condenser Systems
Modular AHU
Modular Desiccant AHU Package
Skid-mounted dual-wheel desiccant air handlers integrating chilled water coils, electric/steam regeneration, and direct PLC telemetry.
Skid-Mounted AHU
Strategic Procurement Analysis
Why International Industrial Enterprises Source From China OEM/ODMs
A technical assessment of capital expenditure optimization, vertical supply chain clustering, and execution speed in the era of clean energy gigafactories.
Full Supply Chain Clustering
Hangzhou DryAir is situated at the epicenter of China’s advanced Yangtze River Delta industrial belt. From high-grade honeycomb desiccant runner substrates to explosion-proof centrifugal blowers, titanium fin exchangers, and PLC modules, complete vertical integration ensures shorter fabrication lead times (4–8 weeks vs. 20+ weeks in western markets) and unmatched cost efficiency.
Unrivaled Scale & Fast Lead Times
With a monthly capacity surpassing 200+ units across standard modular and custom heavy industrial AHU lines, Chinese manufacturing enables multinational OEMs to execute parallel plant rollouts without supply bottlenecks. Whether delivering phased 20GWh cell plants or chemical vapor abatement retrofits, high-throughput manufacturing guarantees delivery schedule adherence.
Total Lifecycle CAPEX/OPEX Rationalization
Industrial dehumidification accounts for up to 30–43% of total operating energy in lithium battery dry rooms. By integrating waste-heat regeneration, condensation heat exchangers, and multi-stage desiccant wheels engineered in China, global buyers achieve 25–40% lower equipment CAPEX alongside a 30% reduction in long-term heating OPEX.
Compliance & Reliability Framework
Engineered for Global Grid Compliance & Rigorous Field Audits
Bridging Chinese manufacturing velocity with North American, European, and Pan-Eurasian statutory and engineering codes.
International Statutory Certifications
Every industrial dehumidifier and NMP recovery skid can be configured and certified to meet European CE Directives (Machinery, Low Voltage, EMC), North American UL/CSA electrical safety standards, ASME pressure vessel compliance, and Eurasian EAC codes. Quality systems are audited under ISO 9001 and China's GJB national military-grade quality criteria.
Global Field Commissioning & Spares
Hangzhou DryAir deploys senior HVAC automation engineers directly to overseas client sites for turnkey duct balancing, thermal loop commissioning, and dew point verification. Supported by our rapid-dispatch spare parts logistics hub and an optional comprehensive 2-year overseas warranty agreement, plant downtime risks are completely neutralized.
IoT-Enabled Predictive Telemetry
Integrated SCADA and PLC cloud communication modules enable real-time telemetry tracking of supply dew point variations, motor current draw, rotor differential pressure, and regeneration temperature curves. Remote diagnostic engineers resolve operational anomalies without necessitating cross-border travel.
Application Engineering
Industrial Sector Environmental Dew Point Requirements
Review engineering tolerances across specialized production facilities. Sizing is governed by psychrometric moisture balance, occupant infiltration, and equipment latent loads.
| Industrial Process / Application Sector | Critical Relative Humidity / Dew Point Spec | Operational Risk of Moisture Ingress | Recommended System Configuration |
|---|---|---|---|
| Lithium Battery Cell Assembly & Electrolyte Injection | -40°C to -60°C Dew Point | Moisture reacts with electrolyte to generate hydrofluoric acid (HF), causing cell degradation & thermal risk. | Dual-wheel Rotary Desiccant Dehumidifier + Modular Turnkey Dry Room |
| Next-Gen Solid-State & Lithium Metal Battery Labs | -65°C to -70°C Dew Point | Immediate passivating oxidation and violent reactions of exposed lithium metal anodes. | Ultra-Low Dew Point DHU Desiccant Air Handling Pod with Molecular Sieve |
| Lithium Cathode Electrode Slurry Drying Exhaust | ≥99% NMP Recovery / Low VOC | Toxic emissions of volatile N-Methyl-2-pyrrolidone solvent, violating EPA/EEA environmental mandates. | ZJRH NMP Solvent Recovery Condensation System with Deep Chilling |
| Pharmaceutical Effervescent Tablet & Soft Capsule Encapsulation | 10% to 25% RH @ 20–22°C | Hygroscopic powder caking, sticking to compression punch dies, and gelatin softgel softening. | Sanitary GMP-Grade Rotary Desiccant Dehumidifier with HEPA Filtration |
| Military Defense Munitions, Optics & Avionics Storage | ≤35% to 40% RH (GJB Compliant) | Oxidative propellant degradation, electronic corrosion, and lens fungal formation. | Ruggedized GJB-Certified Military Desiccant Conditioning Unit |
| Petrochemical Fuel Terminals & Organic Solvents Tank Farms | Strict VOC Mass Concentration Limits | Atmospheric vapor losses and hazardous explosive gas accumulation during bulk transfer. | Condensation Recovery System paired with Regenerative Thermal Oxidizers (RTO) |
| Bulk Raw Material Warehouses & Electronic Staging | 45% to 55% RH | Surface condensation on steel coils, mold growth on packaging, microchip solder oxidation. | Energy-Efficient Industrial Refrigerative Dehumidifier Package |
Turnkey Delivery Framework
5-Stage EPC Engineering Process & Industry Trends
From mathematical load calculations to on-site commissioning, our proprietary delivery pipeline ensures guaranteed dew point stability at lowest electrical power density.
01. Psychrometric & Latent Modeling
Our 74-member engineering team examines room envelope tightness, personnel ventilation rates, and internal process thermal dissipation to calculate required mass moisture removal (g/kg dry air) without oversizing compressors.
02. Thermodynamic Custom Sizing
Selection of silica gel or molecular sieve rotors, pre-cooling coil fin geometry, and desiccant wheel reactivation heating media (low-pressure steam, natural gas direct-fired, or electric heat pumps) for optimal thermodynamic performance.
03. Factory Verification & Testing
Every unit undergoes dynamic testing in our in-house environmental test lab before export. Supply airflow, pressure drop, rotor seals, and supply air dew point are fully certified and signed off against procurement specifications.
Future Trends Reshaping Industrial Dehumidification
1. Heat Pump Reactivation & Waste Heat Integration: Traditional desiccant reactivation relies heavily on high-power electrical heaters. Hangzhou DryAir is pioneering dual-source heat recovery that captures heat from air compressor jackets and chiller condenser water, cutting regeneration power by up to 40%.
2. Next-Gen Ultra-Low Dew Points (-80°C): As commercial solid-state batteries with sulfide electrolytes emerge, moisture sensitivity increases tenfold. Next-generation molecular sieve composite wheels engineered by Hangzhou DryAir are pushing repeatable supply air performance to ultra-dry thresholds below -75°C to -80°C.
3. Cloud Predictive Maintenance: Smart IoT humidity and vibration sensors continuously stream rotor health data to localized plant SCADA systems, preventing unexpected wheel saturation or bearing failure prior to routine scheduled maintenance.
Procurement & Technical FAQ
Frequently Asked Questions by Industrial HVAC Engineers
Detailed technical answers addressing supply chain validation, engineering certifications, dew point capabilities, and overseas project delivery.
What is the minimum controllable dew point Hangzhou DryAir desiccant dehumidifiers can achieve?
DryAir rotary desiccant dehumidifier units are capable of consistently controlling supply air down to a verified minimum of -70°C dew point (equivalent to < 0.0033 g/kg absolute moisture content). This specification is crucial for lithium battery manufacturing lines (slurry mixing, cathode drying, cell winding, assembly, and electrolyte injection) to prevent catastrophic reactions with lithium salts such as LiPF6.
Does Hangzhou DryAir engineer and deliver turnkey dry rooms for international battery factories?
Yes. Hangzhou DryAir acts as a comprehensive EPC turnkey contractor covering the complete lifecycle: pre-sales psychrometric calculation, room architectural envelope engineering (insulated rockwool/PIR cleanroom panels with hermetic vapor barrier sealing), industrial desiccant air handlers, duct distribution design, on-site mechanical installation, and dew point certification. We have delivered mission-critical dry room infrastructure for world-tier battery enterprises including Tesla, Northvolt, CATL, ATL, BYD, EVE Energy, Farasis, Envision, SVOLT, and TTI.
Which international certifications and electrical standards do your machines adhere to for export?
To satisfy stringent regulatory requirements across different global territories, our systems can be custom engineered to hold CE certification (LVD, MD, EMC Directives) for Europe, UL and CSA standards (including UL 508A industrial control panels) for North America, ASME boiler & pressure vessel codes for thermal loops, and EAC certification for Eurasian markets. Internally, our facilities maintain strict adherence to ISO 9001 quality management and the GJB national military standard system.
How does the NMP recovery system achieve a ≥99% solvent recovery efficiency rate?
DryAir ZJRH Series NMP Recovery Systems utilize a multi-stage process combining precision air-to-air heat exchangers, deep-cooling chilled water condensation coils, and specialized adsorption/concentration runners. The hot exhaust gas from cathode coating drying ovens is progressively cooled, allowing NMP vapor to condense into liquid state with minimal gas phase slip. This achieves a verified solvent recovery rate equal to or exceeding 99%, substantially reducing solvent re-purchasing costs while ensuring full compliance with atmospheric environmental volatile emission regulations.
What after-sales service and engineering warranty are available for international projects?
For global projects, Hangzhou DryAir offers comprehensive localized support programs including remote cloud telemetry diagnostics, guaranteed fast-shipment spare parts packages (replacement belts, filters, PLC modules, rotor motors), and direct deployment of field commissioning engineers to international job sites. Buyers can opt for our comprehensive 2-year international service agreement, ensuring complete technical assurance and operational uptime.
What are the key technical differences between refrigerative and desiccant dehumidifiers?
Refrigerative dehumidifiers extract moisture by cooling the air stream below its dew point, condensing vapor into liquid water on chilled coils. This technology is cost-effective and energy-efficient down to approximately 40% RH or dew points above 5°C to 10°C, below which coil frost formation occurs. Desiccant dehumidifiers utilize chemical adsorption through porous honeycomb wheels (silica gel or molecular sieve) that physically capture water molecules regardless of ambient temperature, achieving deep dry room dew points down to -40°C to -70°C where refrigeration alone cannot function.
Product Catalog Section B
Global Turnkey Environmental Machinery Portfolio
Explore our complete export-certified series of industrial dehumidifiers, recovery condensators, and turnkey cleanroom modules.
Desiccant Pro
Industrial Desiccant Skid
High-airflow rotor dehumidification system engineered for uninterrupted round-the-clock environmental moisture mitigation.
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Modular Dry Room
Custom Gigafactory Enclosure
Airtight cleanroom envelopes with precision airlocks, positive-pressure cascades, and continuous telemetry sensors.
Turnkey Project Enquiries
Purity ≥99%
Cathode Coater NMP Unit
Closed-loop condenser and recovery skid capturing solvent fumes from continuous battery electrode manufacturing lines.
View Solvent System
Direct Condenser
Oil Gas VOC Abatement Unit
Multi-stage cryogenic condensation machinery designed for liquid petrochemical storage, loading terminals, and vapor piping.
VOC Equipment Specs
GMP Grade
Pharma Cleanroom Dehumidifier
Hygienic desiccant air handler package preventing hygroscopic powder agglomeration during tablet compression & packaging.
Pharma Solutions
GJB Compliant
Defense & Aerospace AHU
Rugged environmental conditioning machinery protecting sensitive defense missile components, ammunition, and radars from rust.
Aerospace Systems
Semiconductor
Micro-Electronics Low-RH Unit
Ultra-stable humidity conditioning for semiconductor manufacturing, flat panel display production, and optical clean zones.
Electronics Air Handlers
Turnkey Modular
Standard Industrial Dehumidifier
Proven high-capacity refrigerative and hybrid conditioning modules optimized for warehouse storage and pre-treatment air handling.
Commercial Series
Direct Factory Engineering Access
Request Psychrometric Calculations or Custom Quotation
Connect with our national registered HVAC engineers. Receive process psychrometric modeling, equipment load curves, electrical layouts, and quotation within 24 hours.