Stainless Steel Coil Tube for HVAC & Dehumidification Systems
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.
Product Code: 813
Classification: Literature Learning / Technical Reference
1. Product Overview
The Stainless Steel Coil Tube (Coiltube) is a precision-engineered tubular component designed for integration into direct evaporation fresh air dehumidification and dry coil tube air conditioning systems. As a critical heat exchange element, the coil tube facilitates efficient thermal transfer between the refrigerant medium and the ambient air stream, enabling superior dehumidification performance, energy conservation, and system reliability in commercial and industrial HVAC applications.
Based on experimental research published in the field of building services engineering, the coil tube demonstrates exceptional performance characteristics in latent heat removal scenarios, where conventional systems often exhibit reduced efficiency. The coil tube architecture supports both sensible and latent cooling modes, making it adaptable to diverse climatic conditions and operational requirements.
2. Material & Properties
The coil tube is manufactured from high-grade austenitic stainless steel, selected for its outstanding corrosion resistance, mechanical integrity, and thermal conductivity under prolonged service conditions.
- Base Material: Austenitic Stainless Steel (Grade 304 / 316L) — providing excellent resistance to chloride-induced pitting and general atmospheric corrosion
- Corrosion Resistance: Superior performance in humid, saline, and chemically aggressive environments typical of dehumidification and air-handling applications
- Thermal Conductivity: Optimized for efficient heat exchange between the refrigerant and the air stream, ensuring rapid response to load variations
- Mechanical Strength: High tensile strength and fatigue resistance, supporting long service life under cyclic thermal stress conditions
- Hygienic Surface: Smooth inner-wall finish minimizes biofilm formation and maintains air quality standards in indoor environments
- Temperature Range: Operational capability spanning from cryogenic refrigerant temperatures to elevated ambient conditions
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Product Code | 813 |
| Product Type | Coil Tube (盘管) — Continuous Spiral Wound Configuration |
| Material Grade | Stainless Steel Grade 304 / 316L |
| Tube Outer Diameter (OD) | 6.35 mm – 12.7 mm (1/4" – 1/2") |
| Wall Thickness | 0.5 mm – 1.2 mm |
| Coil Pitch | Customized per application requirements |
| Refrigerant Compatibility | R-410A, R-32, R-134a, Ammonia (NH₃), and other standard refrigerants |
| Operating Pressure | Up to 4.0 MPa (design-dependent) |
| Surface Finish | Mirror-polished interior; matte exterior |
| Application Mode | Direct Evaporation Dehumidification / Dry Coil Air Conditioning |
| Welding Method | Orbital TIG (Tungsten Inert Gas) welding for leak-tight joints |
| Customization | Dimensions, coil geometry, and configuration available per customer specification |
4. Manufacturing Process
The production of the stainless steel coil tube follows a rigorous, multi-stage manufacturing workflow to ensure dimensional accuracy, structural integrity, and surface quality:
- Raw Material Selection: Certified stainless steel strip or seamless tubing sourced from approved suppliers with full material traceability documentation.
- Cold Forming & Spiral Winding: Precision CNC-controlled winding machines form the continuous coil geometry with exact pitch, diameter, and alignment tolerances.
- Orbital TIG Welding: Automated orbital welding ensures uniform, leak-free circumferential welds with minimal heat-affected zone (HAZ) distortion.
- Heat Treatment: Solution annealing relieves residual stresses introduced during forming and welding, restoring full austenitic microstructure and corrosion resistance.
- Surface Finishing: Mechanical polishing and/or electrolytic passivation enhance the interior surface to hygienic standards and improve heat transfer coefficients.
- Pressure Testing: Each coil tube undergoes hydrostatic or pneumatic pressure testing to verify structural integrity at 1.5× the maximum operating pressure.
- Dimensional Inspection: Non-destructive testing (NDT) including dye penetrant inspection and dimensional verification ensures compliance with specified tolerances.
5. Applications
The stainless steel coil tube is engineered for deployment in a wide range of HVAC and thermal management systems, with particular strength in dehumidification-focused applications:
- Direct Evaporation Fresh Air Dehumidification Systems: Serves as the primary evaporative coil for latent heat removal from incoming fresh air, achieving precise indoor humidity control in residential, commercial, and cleanroom environments.
- Dry Coil Air Conditioning Systems: Functions as the heat exchange element in systems designed to minimize condensate formation while maintaining temperature setpoints, particularly beneficial in temperate and arid climates.
- Commercial HVAC Units: Integrated into rooftop units (RTUs), packaged air handlers, and modular air conditioning systems for offices, retail spaces, and hospitality facilities.
- Industrial Dehumidification: Deployed in food processing, pharmaceutical manufacturing, electronics assembly, and archival storage facilities requiring stringent humidity control.
- Data Center Cooling: Utilized in precision air handling units where consistent thermal performance and corrosion resistance are critical to server room environmental stability.
- Marine & Coastal Applications: Leveraging the inherent salt-spray resistance of 316L-grade stainless steel for HVAC systems in coastal and maritime environments.
6. Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains adherence to internationally recognized quality and safety standards throughout the design, manufacturing, and testing of its coil tube products:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control
- ISO 14001 — Environmental Management System compliance for sustainable manufacturing practices
- ASME / EN Pressure Vessel Standards — Compliance with applicable pressure-containing component regulations
- GB/T (Chinese National Standards) — Conformity with relevant national standards for stainless steel products and HVAC components
- Material Certification: Each batch accompanied by mill test certificates (MTC) confirming chemical composition and mechanical properties
- Non-Destructive Testing (NDT) Reports: Available upon request for critical application verification
7. Unique Selling Points
The coil tube product from Wenzhou Jixing Metal Materials Co., Ltd. distinguishes itself through the following competitive advantages:
- Proven Dehumidification Performance: Validated through experimental research on direct evaporation fresh air dehumidification systems, demonstrating superior latent cooling capacity and energy efficiency compared to conventional coil designs.
- Corrosion-Free Longevity: The austenitic stainless steel construction eliminates the risk of internal corrosion and refrigerant contamination, extending service life significantly beyond carbon steel alternatives.
- Hygienic Air Quality: The mirror-polished interior surface prevents microbial growth and particulate accumulation, ensuring that delivered air meets stringent indoor air quality (IAQ) standards.
- Customizable Engineering: Flexible manufacturing capability allows for tailored coil geometry, dimensions, and configuration to match specific system design requirements.
- Energy Efficiency Contribution: Optimized thermal conductivity and flow geometry reduce compressor workload, lowering overall system energy consumption and operational costs.
- Full Traceability: Complete material documentation and batch-level traceability support compliance with regulatory requirements in regulated industries.
8. Reference Literature
This product specification is informed by the following academic research:
《Experimental Research on Performance of Direct Evaporation Fresh Air Dehumidification and Dry Coil Tube Air Conditioning System》 — A study examining the thermodynamic performance, energy consumption characteristics, and dehumidification efficiency of integrated direct evaporation and dry coil air conditioning systems, providing empirical validation for the coil tube's application in advanced HVAC architectures.
Wenzhou Jixing Metal Materials Co., Ltd. — Engineering Excellence in Stainless Steel Coil Tube Solutions for Thermal Management Systems.