Views: 0 Author: Site Editor Publish Time: 2026-10-30 Origin: Site
At CSTHEATEXCHANGER, we design and manufacture high-durability Bundy Tube Condensers (Wire-on-Tube and Spiral Steel Tube Heat Exchangers) engineered specifically for commercial chest freezers, domestic deep freezers, ice cream hardening cabinets, island display freezers, and upright frozen food merchandisers (standard heat rejection capacities engineered from 150 W to over 2,800 W per condenser assembly). Fabricated from premium double-walled copper-brazed steel Bundy tubing or single-walled resistance-welded steel tubing (∅4.76 mm, ∅6.0 mm, ∅6.35 mm, ∅8.0 mm conforming to ASTM A254 / SAE J527) and cross-welded with high-strength low-carbon steel wires, our freezer condensers feature full-immersion cathodic electrophoretic (E-coat) black painting. Designed for both static natural convection (rear-wall mount) and forced-air dynamic cooling (bottom compressor compartment), CSTHEATEXCHANGER Bundy tube condensers deliver burst pressures >120 bar, complete chemical compatibility with R600a Isobutane and R290, exceptional vibration fatigue resistance, and zero dust-clogging, ensuring rapid freezer pull-down and sub-zero storage stability (−18∘C to −25∘C).
Deep freezers require continuous high-pressure refrigerant condensation under high compression ratios (evaporating at −25∘C to −35∘C and condensing at +40∘C to +55∘C):
BUNDY TUBE WIRE-ON-TUBE CONDENSATION THERMODYNAMICS
================== [CHEST FREEZER / DEEP FREEZER SYSTEM] ==================
• High Compression Ratio: Requires rapid, reliable superheat de-superheating
• Harsh Ambient Operating Range: Up to +38°C to +43°C tropical climate rating
• Refrigerant Compatibility: Pure R600a / R290 / R134a / R404A systems
│
▼
┌────────────────────────────────────────────────────────────────────────────┐
│ CSTHEATEXCHANGER® BUNDY TUBE WIRE-ON-TUBE CONDENSER │
│ • Double-Wall Copper-Brazed Steel Tube (ASTM A254 / SAE J527) │
│ • Multi-Spot Resistance Welded Carbon Steel Wire Matrix (1.2 - 1.6 mm) │
│ • Full Cathodic Electrophoretic (E-Coat) Black Epoxy Paint │
└─────────────────────┬────────────────────────────────┬─────────────────────┘
│ │
▼ ▼
┌────────────────────────────────────────┐ ┌────────────────────────────────────┐
│ STATIC NATURAL CONVECTION (REAR-WALL) │ │ FORCED-AIR DYNAMIC CHASSIS MOUNT │
│ • Zero fan power consumption / silent │ │ • Compact under-freezer compartment│
│ • Open wire pitch prevents dust blanket│ │ • High volumetric heat rejection │
└────────────────────────────────────────┘ └────────────────────────────────────┘Bundy tube (double-wall copper-brazed carbon steel) provides unmatched mechanical rigidity, high tensile strength, and vibration dampening. It is immune to mechanical damage during transport, eliminates tube bending fatigue from reciprocating compressor pulsations, and withstands harsh warehouse handling.
In contrast to tightly packed aluminum fin coils that act like air filters and clog with household lint or retail debris, the open wire grid of a wire-on-tube Bundy condenser (5.0 to 10.0 mm5.0 to 10.0 mm wire pitch) allows natural air buoyancy and dust particles to pass through without settling, maintaining steady heat rejection over decades of unserviced operation.
The performance and leak-tight reliability of a wire-on-tube condenser depend on automated multi-point resistance welding and cathodic surface finishing:
================================================================================
CSTHEATEXCHANGER BUNDY TUBE CONDENSER VS. GENERIC STEEL TUBE CONDENSERS
================================================================================
Manufacturing Parameter Generic Steel Condenser CST Heavy-Duty Bundy Tube Condenser
--------------------------------------------------------------------------------
Tubing Metallurgy & Standard Low-Grade Seam Welded Steel Double-Wall Copper-Brazed Bundy (ASTM A254)
Tube Cleanliness & Residual Oil > 50 mg/m² Residual Impurities Ultra-Clean < 15 mg/m² (R600a / R290 Safe)
Wire-to-Tube Resistance Welding Weak Spot Welds (Wires Detach) Automated CNC Multi-Spot Projection Welding
Weld Shear Strength per Wire < 120 N (Prone to Vibration Fail)> 250 N High Mechanical Shear Strength
Coating Technology & Finish Basic Spray Paint (Prone to Rust)Cathodic Electrophoretic (E-Coat) Black
Salt Spray Corrosion Resistance 48 - 72 Hours (Pits & Rusts) > 120 to 240+ Hours ASTM B117 (Salt Spray)
Operating Burst Pressure 60 - 80 bar > 120 to 180+ bar (High Pressure Safety)
Leakage Verification Standard Basic Water Submersion 100% Helium Mass Spectrometer Testing
================================================================================ CSTHEATEXCHANGER® WIRE-ON-TUBE MATRIX GEOMETRY
SERPENTINE BUNDY TUBE PASSES (High Thermal Conductivity Steel)
┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ <-- Double-Wall Steel
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ Bundy Tube (Ø 4.76 /
│ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ ║ │ 6.0 / 6.35 mm)
├───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┤
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ <-- Low-Carbon Steel Wires
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ (Ø 1.2 - 1.6 mm) Cross-
│ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ ─ │ Welded on Both Sides
└───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┘
CATHODIC ELECTROPHORETIC (E-COAT) BLACK PROTECTIVE COATINGWires (∅1.2 to 1.6 mm∅1.2 to 1.6 mm) are welded perpendicular to both sides of the serpentine Bundy tube bundle simultaneously. Every intersection forms a solid metallurgical weld with shear strength exceeding 250 N250 N, eliminating buzz and rattle noises during compressor operation while providing continuous thermal conduction pathways.
After welding and automated nitrogen purging, condensers undergo multi-stage degreasing, zinc phosphating, and full-immersion cathodic electro-deposition (E-coat) with thermosetting black epoxy. This produces an ultra-uniform, pore-free 15 to 25 μm15 to 25 μm coating that withstands >240 hours of salt spray testing>240 hours of salt spray testing, completely protecting steel tubes from moisture and condensation rust.
CSTHEATEXCHANGER BUNDY TUBE FREEZER CONFIGURATIONS
[1. STATIC BACK-MOUNTED WIRE CONDENSERS]
• Flat rectangular panels mounted on the exterior rear wall of chest freezers.
• Natural convection air draft; zero maintenance and silent operation.
─────────────────────────────────────────────────────────────────────────────
[2. COMPACT FORCED-AIR DYNAMIC BUNDY COILS]
• Folded L-shape, U-shape, or spiral coiled configurations.
• Mounted in lower compressor compartments with small EC/shaded-pole fans.
─────────────────────────────────────────────────────────────────────────────
[3. FOAMED-IN SKIN CONDENSER TUBES (HOT-WALL CONDENSERS)]
• Bare or coated Bundy tubes affixed to inner steel side sheets prior to PU foaming.
• Serves as anti-sweat perimeter heaters around freezer lids and door gaskets.(Note: The following engineering parameters represent standard manufacturing design envelopes. Exact dimensions, tube diameters, wire counts, and bracket mountings are custom-built to OEM freezer chassis specifications.)
================================================================================
CSTHEATEXCHANGER BUNDY TUBE FREEZER CONDENSER (CST-BTC SERIES)
================================================================================
Engineering Parameter Standard Manufacturing & Design Range
--------------------------------------------------------------------------------
Heat Rejection Capacity Range Typical: 150 W to 2,800+ W per condenser module (Customizable)
Target Refrigeration Equipment Chest Freezers, Deep Freezers, Island Freezers, Ice Cream Cabinets
Refrigerant Compatibility R600a (Isobutane), R290 (Propane), R134a, R404A, R452A, R513A
Primary Tube Metallurgies Double-Wall Copper-Brazed Steel Bundy Tube (ASTM A254 / SAE J527)
or Single-Wall Resistance-Welded Precision Steel Tube (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 (5/16")
Tube Wall Thickness 0.60 mm to 0.71 mm (Heavy-Wall High-Pressure Rating)
Welded Wire Metallurgy Low-Carbon Steel Wire (Ø 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.8 mm)
Wire Pitch / Spacing 5.0 mm to 12.0 mm (Customizable for Natural or Forced Airflow)
Surface Coating Finish Cathodic Electrophoretic (E-Coat) Black Epoxy Paint (15 - 25 µm)
Salt Spray Corrosion Rating > 120 to 240+ Hours ASTM B117 Neutral Salt Spray (Zero Red Rust)
Internal Cleanliness Standard < 15 mg/m² Residual Impurities; Moisture < 10 mg/m² (R600a Safe)
Design Proof Pressure Rating Operating Pressure: 25 - 35 bar | Burst Pressure: > 120 bar
Leakage Verification Standard 100% Helium Mass Spectrometer Vacuum Leak Testing (< 1x10⁻⁶ mbar·l/s)
Quality & Environmental Codes RoHS, REACH, UL 207, CE / PED, ISO 9001:2015 Certified
================================================================================Bundy steel tubing offers superior mechanical strength, high burst pressure (>120 bar>120 bar), and resistance to physical impacts and vibration fatigue during transport and heavy daily usage. When combined with automated wire resistance welding and E-coating, it provides the most cost-effective and durable heat dissipation solution for low-temperature freezers.
Hydrocarbon refrigerants are sensitive to internal tube contaminants, moisture, and particulate matter. CSTHEATEXCHANGER applies high-temperature dry nitrogen internal purging and sealed plastic end-capping, keeping internal residual contamination strictly below 15 mg/m2 and residual moisture below 10 mg/m2, preventing capillary tube freeze-ups.
Yes. We manufacture customized flat static back-wall condensers, folded L-shaped/U-shaped forced-air coils, and continuous spiral configurations with custom brackets, mounting eyelets, and pre-brazed copper connection stubs tailored to OEM chassis drawings.
Achieve rapid freezer pull-down, eliminate dust clogging, and guarantee decades of leak-free reliability with CSTHEATEXCHANGER:
Custom Wire-on-Tube Bundy Condensers for Chest & Deep Freezers (150 W to 2.8 kW+)
Double-Wall Copper-Brazed Steel Bundy Tubes (ASTM A254 / SAE J527 Standards)
Automated High-Strength CNC Multi-Spot Resistance Wire Projection Welding
Cathodic Electrophoretic (E-Coat) Black Finish for >240 Hours Corrosion Protection
100% Helium Leak Tested & Chemically Compatible with R600a, R290, and R134a
Custom 2D/3D CAD Engineering & High-Volume OEM Direct Supply Worldwide
Contact our specialized commercial refrigeration engineering team today with your freezer cabinet dimensions, target heat dissipation (WW), tube outer diameter, and chassis layout for custom thermal modeling, engineering drawings, and factory-direct quotation.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
