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At CSTHEATEXCHANGER, we custom-engineer and manufacture food-grade, high-yield finned-tube evaporators specifically designed for residential, commercial, and industrial Atmospheric Water Generators (AWGs) producing from 20 Liters to over 10,000+ Liters of pure potable drinking water daily from air humidity. Engineered to optimize psychrometric dew point condensation without frost formation, CSTHEATEXCHANGER AWG evaporators feature seamless deoxidized copper (Cu-DHP) or sanitary AISI 304/316L stainless steel tubes, food-safe super-hydrophilic titanium-dioxide/silicate fin coatings (water contact angle <12∘), and optimized multi-circuit counter-crossflow geometry. Delivering up to 35% higher water extraction rates per kilowatt-hour (≥0.35 to 0.55 L/kWh) and certified to FDA / NSF/ANSI 61 potable water standards, our customized evaporators eliminate water droplet hold-up, prevent bacterial colonization, and ensure maximum water generation across challenging 30% to 95% RH climates.
Atmospheric Water Generators (AWGs) represent a transformative decentralized solution to global freshwater scarcity, extracting pure drinking water directly from the ambient troposphere—which holds an estimated 12,900 cubic kilometers of fresh water vapor at any given moment.
An AWG operates by drawing humid ambient air across a specialized sub-dew-point refrigeration evaporator coil:
ATMOSPHERIC WATER GENERATOR (AWG) EXTRACTION LOOP
┌────────────────────────────────────────────────────────────────────────┐
│ AMBIENT HUMID AIR INTAKE (25°C–38°C / 40%–90% Relative Humidity) │
└───────────────────────────────────┬────────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────────────────────┐
│ CSTHEATEXCHANGER® SUPER-HYDROPHILIC FOOD-GRADE AWG EVAPORATOR │
│ • Controlled Evaporating Temperature (SST: +1.5°C to +4.5°C No Frost) │
│ • Super-Hydrophilic Blue Fin Coating (Contact Angle <12° Rapid Sheet) │
│ • Metallurgy: Cu-DHP Tin-Plated Copper OR 100% Sanitary SS304/316L │
│ • Low Air Pressure Drop (ΔP ≤ 55 Pa) Maximizing Air Throughput CFM │
├────────────────────────────────────────────────────────────────────────┤
│ DEW POINT CONDENSATION: Moisture Condenses into Pure Potable Water │
└───────────────────────────────────┬────────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────────────────────┐
│ SANITARY SS316L DRAIN TRAY ➔ UV Sterilization & Mineralization Tank │
│ Maximum Energy Efficiency: Up to 0.45 – 0.55 Liters / kWh │
└────────────────────────────────────────────────────────────────────────┘The commercial viability of an AWG machine hinges entirely on its Specific Energy Consumption (kWh/LiterkWh/Liter or Liters/kWhLiters/kWh):
Sub-Dew-Point Precision: The coil surface temperature must drop strictly below the incoming air's dew point (TdpTdp) to trigger intense latent phase change from vapor to liquid.
Anti-Freezing Window (>0.5∘C>0.5∘C): If the coil temperature drops below 0∘C0∘C, condensed water freezes into ice, insulating the coil, choking airflow, and forcing energy-wasting defrost cycles that halt water production.
Droplet Bridging & Re-Evaporation Loss: On standard hydrophobic or bare aluminum fins, condensed water beads into large spherical droplets that bridge fin gaps. These stagnant droplets block airflow and re-evaporate back into the discharged air stream before reaching the collection basin.
Food-Contact Leaching & Microbial Hygiene: Condensed water is naturally distilled and slightly acidic (pH 5.8 to 6.5). If the coil uses generic coatings or toxic braze fluxes, heavy metals (lead, zinc, copper ions) leach directly into the drinking water.
At CSTHEATEXCHANGER, we engineer custom finned-tube evaporators tailored specifically to conquer the multi-physics challenges of atmospheric water harvesting:
CSTHEATEXCHANGER® AWG EVAPORATOR ARCHITECTURE
┌────────────────────────────────────────────────────────────────────────┐
│ FOOD-GRADE SANITARY CASING (HEAVY AISI 304 / 316L STAINLESS STEEL) │
│ • Integrated Sloped Deep-V Drain Pan with Sanitary Tri-Clamp Spout │
├────────────────────────────────────────────────────────────────────────┤
│ MULTI-CIRCUIT UNIFORM EXPANSION TUBE MATRIX (NO LOCALIZED FREEZING) │
│ ┌────────────────────────────────────────────────────────────────────┐ │
│ │ Seamless Cu-DHP Copper Tubes with Pure Tin Electro-Plating │ │
│ │ OR 100% Sanitary AISI 304 / 316L Stainless Steel Tubes (Ra ≤ 0.4µm) │ │
│ │ Precision Multi-Way Venturi Refrigerant Distributor (R410A / R32) │ │
│ │ Balanced Circuit Lengths Ensuring 100% Uniform Surface Temperature │ │
│ └────────────────────────────────────────────────────────────────────┘ │
├────────────────────────────────────────────────────────────────────────┤
│ ADVANCED SUPER-HYDROPHILIC & ANTI-MICROBIAL LOUVERED FINS │
│ • Ultra-Low Contact Angle (<12°) Inducing Immediate Gravity Sheeting │
│ • Non-Toxic Inorganic Nano-Silicate Coating (NSF/ANSI 61 & FDA Grade) │
│ • Optimized Fin Density: 8 to 12 FPI (Zero Water Retention Bridge) │
├────────────────────────────────────────────────────────────────────────┤
│ 100% HELIUM MASS SPECTROMETRY ZERO-LEAK GUARANTEE (<1.0x10⁻⁶ mbar·L/s) │
└──────────────────────────────────┬─────────────────────────────────────┘
│
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Maximum Water Yield · Zero Toxic Leaching · 15+ Year LifespanCSTHEATEXCHANGER fins are treated with an advanced food-grade inorganic nano-silicate / TiO2TiO2 hydrophilic coating that reduces water contact angles to under 12∘12∘.
Instantaneous Gravity Water Sheeting: Condensed water cannot form standing spherical droplets. Instead, moisture collapses into an ultra-thin liquid film that glides smoothly and rapidly down the vertical fin channels into the collection tray.
Eliminates Re-Evaporation: Accelerates water runoff by 300%300%, preventing moisture from being blown off or re-absorbed by the departing air stream.
Tin-Plated High-Purity Copper (Cu-DHP): Features seamless deoxidized copper tubes coated with a certified food-grade pure tin (SnSn) plating, combining the extraordinary thermal conductivity of copper with complete chemical isolation from acidic condensate.
All-Stainless Steel (AISI 304 / 316L): For commercial, military, and pharmaceutical-grade AWG units, we manufacture evaporators featuring 100% electropolished stainless steel tubes and fins, ensuring zero heavy metal leaching, zero corrosion, and compatibility with ozone (O3O3) and UV sterilization.
Non-uniform refrigerant distribution in standard evaporators causes localized cold spots (<0∘C<0∘C) that trigger premature frost bridging while other sections remain too warm to condense water.
CSTHEATEXCHANGER incorporates a precision brass/stainless Venturi distributor with computer-calculated equal-length circuit paths. Guarantees a perfectly uniform coil face temperature of +2.0∘C±0.5∘C+2.0∘C±0.5∘C across 100% of the active fin area, eliminating frost without cycling off the compressor.
Fin spacing is carefully optimized between 2.1 mm2.1 mm and 3.2 mm3.2 mm (8 to 12 FPI8 to 12 FPI) with sine-wave corrugated profiles.
Keeps air-side static pressure drop below 45 Pa−65 Pa45 Pa−65 Pa at design face velocities (1.8 m/s−2.2 m/s1.8 m/s−2.2 m/s), allowing compact, ultra-low-wattage DC brushless fans to push high air volumes for maximum daily water harvest.
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CSTHEATEXCHANGER AWG EVAPORATOR (MODEL CST-AWG-1000L) PERFORMANCE PROFILE
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Ambient Condition (Dry Bulb / RH) Daily Water Yield (Liters/Day) Energy Efficiency
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Hot & Humid (32°C / 80% RH) 1,280 Liters / 24 Hours 0.48 kWh / Liter
Standard Tropical (30°C / 70% RH) 1,050 Liters / 24 Hours 0.54 kWh / Liter
Moderate Temperate (25°C / 60% RH) 740 Liters / 24 Hours 0.68 kWh / Liter
Arid Low-Humidity (28°C / 40% RH) 420 Liters / 24 Hours 0.92 kWh / Liter
Severe Dry Limit (22°C / 30% RH) 210 Liters / 24 Hours 1.45 kWh / Liter
================================================================================CSTHEATEXCHANGER manufactures custom AWG evaporators across all machine scales:
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CSTHEATEXCHANGER AWG EVAPORATOR PRODUCT MATRIX
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Machine Category Daily Water Capacity Airflow Range Refrigerants
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Residential Home / Office 20 L – 100 L / Day 150 – 500 m³/h R134a / R290
Commercial Water Station 250 L – 1,000 L / Day 1,200 – 4,500 m³/h R410A / R32
Military & Disaster Rel. 1,000 L – 3,000 L / Day 4,500 – 12,000 m³/h R410A / R454B
Industrial Municipal AWG 5,000 L – 20,000+ L/Day 20,000 – 80,000 m³/hR134a / R513A
================================================================================Residential & Office Drinking Dispensers: Ultra-compact 25 mm−45 mm25 mm−45 mm depth coils designed for whisper-quiet (<42 dBA<42 dBA) countertop and free-standing dispensers.
Commercial Community Water Hubs: High-durability multi-row coils delivering clean drinking water for schools, remote hotels, and off-grid villages.
Containerized Disaster Relief & Military Units: Ruggedized, shock-resistant stainless steel coils built into 20ft/40ft mobile tactical containers operating in desert warfare and hurricane relief zones.
Agricultural Greenhouse Humidity Harvesters: Dual-function evaporators that simultaneously dehumidify greenhouse air and recover pure irrigation water for crops.
Daily Water Extraction Range: 20 Liters/Day20 Liters/Day to over 25,000 Liters/Day per module.
Applicable Refrigerants: R410A, R32, R134a, R454B, R290 (Natural Propane), R407CR410A, R32, R134a, R454B, R290 (Natural Propane), R407C.
Tube Metallurgies: High-Purity Seamless Copper (Cu-DHP / C12200), Pure Tin-Plated Copper, AISI 304, or AISI 316L Stainless Steel (7.0 mm,9.52 mm,7.0 mm,9.52 mm, or 12.7 mm12.7 mm OD).
Fin Spacing / Profiles: 8 to 12 FPI8 to 12 FPI (2.1 mm−3.2 mm pitch) Corrugated Louvered Aluminum or Stainless Steel.
Surface Coating: Food-Grade Super-Hydrophilic Blue Nano-Silicate / TiO2TiO2 (Water Contact Angle <12∘<12∘; NSF/ANSI 61 Certified; Anti-Bacterial ASTM G21 Grade 0).
Casing Material: AISI 304 / AISI 316L Stainless Steel with Deep-V Sloped Drain Tray.
Operating Pressure: Rated to 3.0 MPa3.0 MPa (435 psig); Burst Pressure >10.0 MPa>10.0 MPa.
Leak Testing: 100% Helium Mass Spectrometry Vacuum Leak Inspection (<1.0×10−6 mbar⋅L/s<1.0×10−6 mbar⋅L/s).
Standards & Compliance: FDA 21 CFR Part 175/177, NSF/ANSI Standard 61, CE, ISO 9001:2015.
On untreated bare aluminum, water forms round droplets with contact angles >70∘>70∘. These droplets bridge across fin gaps, blocking airflow and re-evaporating into the exhaust air. CSTHEATEXCHANGER super-hydrophilic coating forces water to spread into an ultra-thin film (contact angle <12∘<12∘) that drains instantly into the collection pan, increasing total daily water yield by up to 35%35%.
Standard HVAC coils use raw copper and lead-bearing solder that leach ions into acidic condensate. CSTHEATEXCHANGER AWG evaporators utilize 100% food-grade pure tin-plated copper tubes or electropolished AISI 316L stainless steel paired with non-toxic, certified inorganic coatings complying strictly with FDA and NSF/ANSI Standard 61 drinking water safety standards.
Yes. In low-humidity regions (Middle East, desert microclimates), the dew point is low. Our engineering team designs high-density, multi-row deep coil configurations with customized refrigerant circuit pass splits and variable fin pitches that maximize air contact time and enthalpy drop without causing coil frost.
Maximize your Atmospheric Water Generator's daily water production and energy efficiency with CSTHEATEXCHANGER:
Custom-Engineered Super-Hydrophilic Finned-Tube AWG Evaporators
100% Food-Grade NSF/ANSI 61 & FDA Certified Materials
Tin-Plated Copper & AISI 316L Stainless Steel Sanitary Coils
Turnkey CAD Design & Rapid Prototyping for AWG OEM Manufacturers
Contact our atmospheric water harvesting engineering division today with your target daily water volume (Liters/day), airflow CFM, and design ambient humidity range for an optimized thermodynamic simulation and technical proposal.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
