Views: 0 Author: Site Editor Publish Time: 2026-11-03 Origin: Site
At CSTHEATEXCHANGER, we design and manufacture high-efficiency Copper-Plated Steel Bundy Tube Condensers (Wire-on-Tube, Spiral Coiled, and Dynamic Forced-Air Condensers) engineered specifically for commercial and domestic refrigerators, chest freezers, drinking water coolers, display merchandisers, ice makers, and dehumidifiers (heat rejection capacities engineered from 80 W to over 1,500 W). Fabricated from double-walled copper-brazed steel Bundy tubing or copper-electroplated precision low-carbon steel tubing (∅4.76 mm [3/16"], ∅6.0 mm, ∅6.35 mm [1/4"], and ∅8.0 mm conforming to ASTM A254 / SAE J527 / DIN 74234), our condensers utilize continuous internal and external copper-plated layers (3 μm to 5 μm3 μm to 5 μm) that enhance thermal conductivity, provide galvanic barrier protection, and enable direct copper-to-copper brazing without flux contamination. Cross-welded with high-strength carbon steel wires and finished with full-immersion cathodic electrophoretic (E-coat) black epoxy paint, CSTHEATEXCHANGER copper-plated Bundy condensers deliver burst pressures >140 bar, ultra-clean internal bore surfaces (<15 mg/m2<15 mg/m2) optimized for R600a Isobutane, R290 Propane, and R134a, ensuring maximum heat rejection efficiency and decades of leak-free operation.
The core of a copper-plated Bundy tube condenser lies in its metallurgical bonding process, combining the mechanical strength of steel with the thermal and corrosion advantages of copper:
COPPER-PLATED STEEL BUNDY TUBE METALLURGICAL FORMING
================== LOW-CARBON STEEL STRIP (SPCC / 08Al) ==================
[ Continuous Dual-Side Electrolytic Copper Coating: 3 µm to 5 µm Cu Layer ]
│
▼
┌────────────────────────────────────────────────────────────────────────────┐
│ DOUBLE-WALL 720° ROLL FORMING (ASTM A254 / SAE J527 STANDARDS) │
│ Steel strip is wrapped around itself into a continuous two-ply cylinder │
└────────────────────────────┬───────────────────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────────────────────────┐
│ HIGH-TEMPERATURE CONTINUOUS VACUUM / REDUCING ATMOSPHERE FURNACE (> 1100°C)│
│ Copper layers melt and flow, fusing the double-ply steel wall into a solid │
│ jointless metallurgical tube structure with 100% copper-wetted bore │
└────────────────────────────┬───────────────────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────────────────────────┐
│ PRECISION CNC SERPENTINE BENDING + MULTI-SPOT WIRE RESISTANCE WELDING │
│ Automated wire grid projection welding + Cathodic Electrophoretic E-Coat │
└────────────────────────────────────────────────────────────────────────────┘================================================================================
COPPER-PLATED BUNDY TUBE VS. UNPLATED SEAM-WELDED STEEL TUBES
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Engineering Parameter Generic Seam-Welded Steel Tube CST Copper-Plated Double-Wall Bundy Tube
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Tube Manufacturing Standard Single-Wall Seam Welded (EN 10305) Double-Wall 720° Copper-Brazed (ASTM A254)
Copper Coating Thickness None (Raw Carbon Steel) 3.0 to 5.0 µm Electrolytic Copper Layer
Internal Corrosion Barrier Prone to Rust from Moisture Continuous Copper Barrier Passivation
Refrigeration Brazing Interface Requires Aggressive Corrosive Flux Direct Clean Copper-to-Copper Silver Brazing
Mechanical Burst Pressure 50 - 70 bar > 140 to 180+ bar (Extreme Safety Margin)
Internal Surface Smoothness Rough Seam Bead (High ΔP) Ultra-Smooth Inner Bore (Low Friction Loss)
Internal Residual Impurities > 35 mg/m² Ultra-Clean < 15 mg/m² (R600a/R290 Safe)
Fatigue & Vibration Resistance Prone to Weld-Seam Cracking Ductile Solid-State Copper Metallurgical Bond
================================================================================Prior to roll-forming, the high-purity low-carbon steel strip is electroplated with a dense copper layer (3 to 5 μm3 to 5 μm). Inside the 1100∘C1100∘C reducing-atmosphere brazing furnace, this copper liquefies and wicks into the overlapping steel seams, creating an imperviously fused double-walled tube.
The external copper layer allows technicians to braze compressor discharge lines, filter driers, and capillary tubes directly using standard copper-phosphorus or silver alloys without requiring aggressive corrosive fluxes that could enter the refrigeration circuit.
CSTHEATEXCHANGER manufactures copper-plated steel Bundy tube condensers across three specialized configurations:
CSTHEATEXCHANGER BUNDY CONDENSER ARCHITECTURAL FORMATS
[1. FLAT WIRE-ON-TUBE STATIC CONDENSERS]
• Parallel rows of low-carbon steel wires cross-welded to serpentine Bundy tubes.
• Mounted on appliance rear walls; operates on natural air convection (0 dBA silent).
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[2. SPIRAL / HELICAL WOUND BUNDY CONDENSERS]
• Continuously coiled cylindrical Bundy tube bundles for compact round cabinets.
• Ideal for water coolers, milk cooling tanks, and beverage dispenser canisters.
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[3. COMPACT COMPRESSOR-COMPARTMENT DYNAMIC CONDENSERS]
• Multi-pass folded serpentine Bundy coils paired with shaded-pole or EC fan blowers.
• High heat rejection capacity in tight under-counter refrigeration machine bases. CSTHEATEXCHANGER® CROSS-WELDED WIRE-ON-TUBE MATRIX
NATURAL OR FORCED AIRFLOW CONVECTION
┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ <-- Double-Wall Copper-Plated
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ Bundy Steel Tubing
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ (Ø 4.76, 6.0, 6.35 mm)
├───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┤
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ <-- Low-Carbon Steel Wires
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ (Ø 1.2 - 1.5 mm) Multi-Point
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ Projection Resistance Welded
└───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┘
FULL IMMERSION CATHODIC ELECTROPHORETIC (E-COAT) BLACK EPOXY LAYERParallel low-carbon steel wires (∅1.2 to 1.5 mm∅1.2 to 1.5 mm) are simultaneously fused to both faces of the serpentine Bundy coil using precision CNC multi-spot welders. Each weld joint achieves a shear strength exceeding 220 N220 N, eliminating harmonic compressor resonance and ensuring efficient conductive thermal transfer from the tube to the extended wire cooling surface.
Following assembly, the entire welded condenser matrix is submerged in a cathodic electro-deposition bath. The cured 15 to 25 μm15 to 25 μm black epoxy coating penetrates every microscopic wire-tube intersection, withstanding >240 hours of ASTM B117 neutral salt spray testing.
Modern hydrocarbon and HFO refrigerants utilize ultra-low charges and narrow capillary tubes that are vulnerable to blockages:
COMPREHENSIVE INTERNAL PURITY & PRESSURE STANDARDS
[1. INTERNAL RESIDUAL IMPURITIES: < 15 mg/m²]
• High-velocity chemical degreasing removes all drawing oils and carbon residues.
• Prevents capillary tube waxing and compressor valve carbonization.
─────────────────────────────────────────────────────────────────────────────
[2. INTERNAL RESIDUAL MOISTURE: < 10 mg/m²]
• Vacuum oven dehydration followed by dry nitrogen charging (dew point < -50°C).
• Eliminates ice crystal formation inside sub-zero capillary expansion orifices.
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[3. 100% MASS SPECTROMETER HELIUM LEAK TESTING]
• Tested under high vacuum to detect micro-leaks (< 1x10⁻⁶ mbar·l/s).(Note: The following engineering parameters represent standard manufacturing design envelopes. Tube diameters, serpentine passes, wire spacing, and bracket geometries are customized to OEM equipment drawings.)
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CSTHEATEXCHANGER COPPER-PLATED BUNDY TUBE CONDENSER (CST-CPB SERIES)
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Engineering Parameter Standard Manufacturing & Design Range
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Heat Rejection Capacity Range 80 W to 1,500+ W per condenser module (Customizable)
Target Refrigeration Appliance Refrigerators, Freezers, Water Coolers, Ice Makers, Merchandisers
Refrigerant Compatibility R600a (Isobutane), R290 (Propane), R134a, R513A, R1234yf, R404A
Primary Tube Metallurgy Double-Wall Copper-Brazed Steel (ASTM A254 / SAE J527 / DIN 74234)
or Single-Wall Copper-Plated Resistance-Welded Steel (EN 10305)
Primary Tube Outer Diameters Ø 4.76 mm (3/16"), Ø 6.00 mm, Ø 6.35 mm (1/4"), Ø 8.00 mm
Primary Tube Wall Thickness 0.55 mm to 0.71 mm (Heavy Wall for High Pressure Safety)
Copper Electroplating Layer 3.0 µm to 5.0 µm Continuous Electrolytic Copper Cladding
Welded Steel Wire Metallurgy Low-Carbon Steel Wires (Ø 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm)
Wire Pitch / Grid Spacing 4.0 mm to 10.0 mm (Customizable for Static or Dynamic Airflow)
Surface Coating Finish Cathodic Electrophoretic (E-Coat) Black Epoxy Paint (15 - 25 µm)
Corrosion Resistance Standard > 180 to 240+ Hours ASTM B117 Neutral Salt Spray (Zero Red Rust)
Internal Cleanliness Standard < 15 mg/m² Residual Impurities; Residual Moisture < 10 mg/m²
Design & Burst Pressures Operating: 25 - 35 bar | Burst Pressure: > 140 to 180+ bar
Leakage Verification Standard 100% Mass Spectrometer Helium Leak Testing (< 1x10⁻⁶ mbar·l/s)
Quality & Environmental Codes RoHS, REACH, UL 207, CE / PED, ISO 9001:2015 Certified
================================================================================The electrolytic copper layer serves three critical functions: (1) It melts during furnace brazing to fuse the double-wall steel tube into a seamless, leak-free cylinder; (2) It provides an internal and external galvanic corrosion barrier against moisture; and (3) It allows rapid, flux-free copper-to-copper brazing when connecting the condenser into the refrigeration circuit.
Bundy tube wire-on-tube condensers offer superior mechanical robustness, complete resistance to dust and lint clogging (due to wide open wire spacing), zero risk of galvanic tube-to-fin bond degradation, and far easier field repairability via standard torch brazing compared to fragile all-aluminum microchannel coils.
Yes. We engineer and manufacture flat rear-mounted panels, pre-curved semi-cylindrical wraps, multi-folded L/U-shaped compressor base coils, and custom spiral bundles with integrated mounting brackets, vibration dampeners, and pre-swaged tube ends tailored to OEM production lines.
Achieve maximum heat rejection efficiency, eliminate dust clogging, and guarantee decades of leak-free reliability with CSTHEATEXCHANGER:
Custom Copper-Plated Steel Bundy Condensers (80 W80 W to 1,500 W+1,500 W+)
Double-Wall Copper-Brazed Bundy Tubing (ASTM A254 / SAE J527 / DIN 74234)
Automated High-Strength CNC Multi-Spot Resistance Wire Projection Welding
Cathodic Electrophoretic (E-Coat) Black Finish for >240 Hours>240 Hours Salt Spray Protection
100%100% Helium Leak Tested & Optimized for R600aR600a, R290R290, and R134aR134a
Custom Tooling, 2D/3D CAD Modeling & Factory-Direct Global Supply for OEM Brands
Contact our specialized refrigeration thermal engineering team today with your appliance cabinet dimensions, target heat rejection (WW), tube outer diameter, and chassis configuration for custom thermal modeling, engineering drawings, and factory-direct quotations.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
