Stainless Steel Coil Tube — Air-Cooled Dry Evaporator Series (Model JX-CT-1145)
Product Overview
The JX-CT-1145 Stainless Steel Coil Tube is a precision-engineered heat exchange component manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Specifically designed for air-cooled dry evaporator systems operating under wet conditions, this coil tube product represents the culmination of advanced numerical simulation research and performance optimization studies. The product integrates aerodynamic and thermodynamic principles to achieve superior heat transfer efficiency in demanding environments where moisture condensation and airflow resistance are critical performance factors.
Unlike conventional coil tubes, the JX-CT-1145 series has been developed through rigorous Computational Fluid Dynamics (CFD) analysis and thermodynamic modeling, ensuring optimal performance characteristics including enhanced air-side heat transfer coefficients, minimized pressure drop, and improved drainage behavior under condensation conditions.
Material & Properties
The JX-CT-1145 Coil Tube is fabricated from high-grade stainless steel alloys selected for their exceptional corrosion resistance, thermal conductivity, and mechanical durability in refrigeration and HVAC (Heating, Ventilation, and Air Conditioning) applications.
- Primary Alloy: AISI 304 / 316L Stainless Steel (ASTM A269 / ASTM A213)
- Corrosion Resistance: Superior resistance to chloride-induced pitting, acid condensation, and humid atmospheric corrosion
- Thermal Conductivity: 14.9–16.3 W/(m·K) at 20°C, ensuring efficient refrigerant-to-air heat exchange
- Operating Temperature Range: −40°C to +120°C (compatible with R410A, R32, R134a, and ammonia refrigerant systems)
- Mechanical Strength: Tensile strength ≥ 520 MPa; Yield strength ≥ 205 MPa
- Surface Finish: Electro-polished or passivated finish (Ra ≤ 0.4 μm) for reduced fouling and improved wetting characteristics
Specifications
| Parameter | Specification | Standard / Reference |
|---|---|---|
| Model Designation | JX-CT-1145 | Internal Catalog No. 1145 |
| Tube Outer Diameter (OD) | 6.35 mm / 7.94 mm / 9.53 mm / 12.7 mm | ASTM A269 / GB/T 14976 |
| Wall Thickness | 0.40 mm – 1.20 mm | Customizable per application |
| Coil Bend Diameter | 150 mm – 500 mm | ASME B31.5 |
| Maximum Working Pressure | 4.0 MPa (600 PSI) | PNE (Pressure-Nominal Evaluation) |
| Hydrostatic Test Pressure | 6.0 MPa (900 PSI) | 1.5× Maximum Working Pressure |
| Coil Length (Custom) | 10 m – 200 m per assembly | Per customer specification |
| Fin Type (if applicable) | Integral or add-on spiral fins (Al / Cu / SS) | Enhanced surface area up to 6× |
| Surface Treatment | Electro-polishing / Passivation / Hydrophilic coating | ASTM A967 / A380 |
| Refrigerant Compatibility | R410A, R32, R134a, R404A, NH₃ | ISO 817 |
| Applicable Standards | ASTM A269, ASME B31.5, EN 10217, GB/T 14976 | Multi-standard compliance |
Manufacturing Process
The production of JX-CT-1145 Coil Tubes follows a rigorous, multi-stage manufacturing workflow designed to ensure dimensional precision, metallurgical integrity, and consistent performance:
- Material Selection & Inspection: Cold-rolled stainless steel strip (2B or BA finish) undergoes spectroscopic analysis (OES) and mechanical property verification prior to processing.
- Tube Forming: Precision cold-forming equipment converts strip material into seamless tubes with tight dimensional tolerances (±0.05 mm wall thickness).
- Coil Bending: CNC-controlled coil winding machines produce uniform helical coils with consistent pitch and bend radius, minimizing work-hardening and residual stress.
- Welding (if segmented): Orbital TIG (Tungsten Inert Gas) welding with full-penetration butt joints; welds undergo 100% visual inspection and periodic radiographic testing (RT).
- Heat Treatment: Solution annealing at 1050°C followed by controlled cooling to restore full corrosion resistance and relieve residual stresses.
- Surface Finishing: Electro-polishing removes the cold-worked surface layer, achieving a smooth, passivated surface that enhances wetting behavior and reduces fouling under condensation conditions.
- Pressure Testing: Every coil assembly undergoes hydrostatic pressure testing at 1.5× the maximum working pressure with a minimum 5-minute hold time.
- Final Inspection & Packaging: Dimensional verification, leak testing (helium or nitrogen), and protective packaging for shipment.
Applications
The JX-CT-1145 Coil Tube is engineered for high-performance thermal exchange applications, with particular emphasis on air-cooled dry evaporator systems operating under wet conditions:
- Air-Cooled Dry Evaporators: Primary application — refrigeration systems utilizing evaporative cooling where coil tubes serve as the refrigerant heat exchange surface (validated through numerical simulation and performance optimization research).
- Industrial Refrigeration: Cold storage facilities, blast freezers, and process cooling systems requiring reliable operation in high-humidity environments.
- HVAC Systems: Commercial and industrial air conditioning units, chillers, and heat pumps.
- Food Processing: Dairy, beverage, and meat processing plants where hygienic, corrosion-resistant heat exchange is mandatory.
- Marine & Offshore: Refrigeration systems exposed to salt-laden air and aggressive atmospheric conditions.
- Pharmaceutical & Chemical: Temperature-controlled storage and process cooling in environments requiring high purity and corrosion resistance.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains comprehensive quality management systems and product certifications to ensure global market compliance:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001:2015 — Environmental Management System certification
- CE Marking — Compliance with European Machinery Directive and Pressure Equipment Directive (PED 2014/68/EU)
- ASME "S" Stamp — Authorized for construction of pressure vessels and heat exchangers per ASME Boiler and Pressure Vessel Code, Section VIII
- EN 10204 3.1 — Material test certificates conforming to European standards
- GB/T 19001 — Chinese national quality management standard compliance
- Material Traceability: Full batch traceability from raw material mill certificate through final product delivery
Unique Selling Points
Research-Validated Performance: The JX-CT-1145 Coil Tube design is grounded in published numerical simulation research on air-cooled dry evaporator coil tubes under wet conditions. Performance optimization parameters — including coil geometry, pitch ratio, and surface treatment — are derived from validated CFD and thermodynamic models, ensuring that each product delivers peak efficiency in its target operating envelope.
- Superior Wet-Condition Performance: Optimized surface finish and hydrophilic treatment minimize condensate retention, reducing air-side pressure drop and maintaining heat transfer efficiency during humid operation.
- Extended Service Life: 316L stainless steel construction with electro-polished surface provides exceptional resistance to chloride corrosion, acid condensation, and biological fouling — significantly extending operational lifespan compared to carbon steel or aluminum alternatives.
- Custom Engineering Capability: Flexible coil geometry, tube dimensions, and assembly configurations tailored to specific system requirements through in-house CAD/CFD design support.
- Full Traceability & Testing: Every coil tube assembly ships with comprehensive documentation including material certificates, pressure test records, and dimensional inspection reports.
- Multi-Standard Compliance: Simultaneous adherence to ASTM, ASME, EN, and GB standards facilitates global project deployment without redesign or recertification.
Wenzhou Jixing Metal Materials Co., Ltd is committed to delivering premium stainless steel coil tube solutions that combine metallurgical excellence, thermal engineering precision, and manufacturing reliability for the global refrigeration and HVAC industry.