• Products
  • Alloys
  • Industries
  • Services
  • Company
  • Career
    • EN
    Enhanced surface tube Gewa-CLF
    Tubes
    Finned Tubes

    Enhanced Surface Condenser Tubes

    Optimized heat transfer for your shell and tube heat exchanger with enhanced surface tubes of the GEWA-C product family. They are engineered to maximize shell‑side condensation efficiency in modern HVAC and refrigeration systems.
    Additional information

    Material overview

    ASTM-UNS No.    		 Wieland Designation ⁠EN Designation EN No. JIS No. Data Sheet
    C12200    		 K21 Cu-DHP CW024A - -
    C70600    		 L10 CuNi10Fe1Mn CW352H - -
    C71500    		 L30 CuNi30Mn1Fe CW354H - -
    C68700    		 S76 CuZn20Al2As CW702R - -
    K01200    		 O41 - - - -
    Overview Product Variants Certification Typical Applications

    Optimized heat transfer for your shell-and-tube heat exchanger

     

    Our enhanced surface tubes have been optimized for use as condenser tubes in shell-and-tube heat exchangers used in the refrigeration and air-conditioning industry. These can be designed to be much more compact, saving you energy, installation space and materials.

     

    • Significantly higher heat transfer coefficients than smooth or low finned tubes
    • More compact and lighter heat exchangers
    • Significantly reduced filling quantities of e.g. refrigerants
    • Highest efficiencies due to smallest temperature differences
    • Precise thermal design with ThermalX

    Enhanced condenser tubes are primarily applied in:

    • Air-conditioning systems (residential & commercial chillers)
    • Refrigeration equipment (food storage, display cases, walk-in coolers)
    • Industrial cooling circuits (process cooling)
    • Safety refrigerant applications (HFCs, HFOs, low-GWP alternatives)
    • Light hydrocarbon refrigerants (where applicable)

    In all cases: cooling water is circulated on the tube side while refrigerant condenses on the shell side.

     

    Product Variants GEWA-C & Turbo C

     

    Thanks to their functional surface enhancements, the outsides of the GEWA-C and Turbo-C tubes offer optimal drainage performance for condensed refrigerants. Coupled with an ideally matched inner tube surface, optimum heat transfer coefficients can be achieved. GEWA and TURBO Condenser Tubes are available with outer and inner surfaces adapted for specific needs of your application.

    The C5 variant delivers superior heat transfer coefficients and is recommended for high-efficiency chillers and demanding condensation duty. Optimized fin geometry provides excellent condensate drainage.

    Available materials: K21, L10, L30, S76

    Best for: New high-efficiency system designs, retrofit of undersized older systems

    The C6 variant is optimized for highest-duty cycles and extreme condensation conditions. Delivers slightly better performance than C5 under peak loads.

    Available materials: K21

    Best for: Extreme climate systems, tropical installations, high-fouling environments

    The C+SL (Standard Length) and C+LW (Light Weight) variants offer reduced material weight without efficiency penalty. Ideal for retrofit applications and cost-optimized designs where weight savings matter (e.g., marine installations).

    Available materials: K21

    Best for: Drop-in replacements, weight-sensitive applications, cost optimization

    The CLF (Low Fouling) variant features enhanced surface geometry that resists deposit buildup and mineral scaling. Available in copper-nickel materials for superior seawater corrosion resistance.

    Available materials: K21, L10 (seawater), L30 (seawater), Carbon Steel

    Best for: Coastal installations, brackish water cooling, applications with contaminated water sources

    The CPL (High Fouling) variant is specifically designed for applications with challenging cooling media (industrial waste, contaminated fluids, oils). Specialized fin geometry prevents fouling accumulation.

    Available materials: K21, L10

    Best for: Industrial waste cooling, oil cooling systems, applications with difficult fluids

    Discover our design software for condensers and evaporators - ThermalX
    Click here for more information about available tube dimensions

     

    Certification

     

    • DIN EN 12452 / EN 10216-2
    • DIN 17679 and VdTÜV 420 / 5 (for use in pressure vessels)
    • ASTM B 359 / ASME SB-359 / ASTM A-498

    Certification for use in pressure vessels has been obtained with AD-Merkblatt W0 / TRD 100. Certificates 3.1 / 3.2 according to DIN EN 10204.

     

    Typical Applications

    You need technical support or require a quote?

    Downloads

    Similar Products

    Tubes
    Finned Tubes

    Safety Tubes

    Safety tubes are used for economical and safe heat transfer. The double wall tubes feature defined leakage paths for the absolutely reliable separation of fluids. For your individual requirements concerning fluid dynamics, we decide on the most suitable surface structure.
    Tubes
    Finned Tubes

    Enhanced Surface Evaporator Tubes

    Wieland’s Enhanced Surface Evaporator Tube combines advanced nucleate‑boiling technology from the GEWA‑B and GEWA‑PB families to deliver outstanding heat‑transfer performance in shell‑and‑tube heat exchangers. Its engineered boiling surface, and optional dual‑enhanced structure with inner spiral fins, significantly boosts thermal efficiency, enabling more compact designs, lower refrigerant charge, and improved energy performance in flooded and falling‑film evaporators.
    Oxygen-free Pure Copper Seawater-resistant copper-nickel alloy
    Tubes
    Finned Tubes

    Enhanced Surface Evaporator Tubes for the Hydrocarbon Industry

    Wieland GEWA-PB is a dual-enhanced boiling tube for shell-and-tube heat exchangers, available in carbon steel and low-temperature carbon steel grades. Designed for LNG refrigeration systems, ethylene reboilers, condensers and other hydrocarbon processing applications, it delivers enhanced heat transfer, compact equipment designs and reduced operating costs.
    Tubes
    Finned Tubes

    Medium-high-finned Tubes

    Medium-high-finned tubes feature a significantly larger heat transfer surface area compared to plain tubes. They are ideal for compact and high-performance coils and shell-and-tube heat exchangers. Wieland medium-high-finned tubes are a proven and robust solution for water heaters, storage tanks, refrigerant condensers, oil coolers, gas coolers or safety heat exchangers and more.
    Aluminum
    Tubes
    Finned Tubes

    High-finned Tubes

    High-finned tubes have a much greater outer surface area than smooth tubes. This allows for particularly compact designs. Thanks to their high, thin fins, these tubes perform particularly well in the heating and cooling of liquids and gases, making them an excellent choice for applications in heating technology, as well as in machinery and plant engineering.
    Aluminum Oxygen-free Pure Copper Seawater-resistant copper-nickel alloy
    Tubes
    Finned Tubes

    Low-finned Tubes

    Wieland low-finned tubes offer a proven, reliable solution for controlling the temperature of gases and liquids, and for evaporating and condensing refrigerants. Their larger heat transfer surface versus plain tubes delivers material and fill-volume savings for refrigeration and air conditioning, oil and gas coolers in machinery and plant engineering, and process engineering. Available as GEWA-K and GEWA-KS in copper, copper-nickel, brass, steel, or titanium.