Transformer Cooling System optimizes heat transfer.

Press Release Summary:

As 520 mm radiator, E4 optimizes heat dissipation via header diameter on inlet and exit path of oil. Enlarged sump conveys oil from inlet header to plates of radiator on inlet side, and similarly enlarged neck conveys oil from plates to exit header on outlet side. Plate spacing increases hydraulic diameter in plate for same perimeter, reducing friction factor for external flow of air. Improves heat transfer coefficient 18-22%, radiator maintains minimal valves and other connections.

Original Press Release:

Trantech Introduces the New Patent Pending E4 Transformer Cooling System

Trantech's commitment to research and development has given life to a new version of 520mm radiator. The new patent pending 520mm E4 - Enhanced, Efficient, Effective and Economical - will provide you benefits beyond traditional radiators.

E4 provides a superior cooling package and structural integrity not available in standard 520mm radiators. With enhanced oil flow characteristics providing improved dissipation; maximum cooling is provided with an E4 cooling system.

The 520mm wide (20.5") radiators were introduced in the American market a few years ago and rapidly became popular, replacing a significant portion of their 15" wide counterparts. Each plate of the 520mm wide radiator is about 35% wider than the 15" radiator and was expected to dissipate correspondingly higher heat. The larger width of the 520mm wide radiators also meant that fewer radiators with fewer valves and other connections were required.

However, other factors like the heat transfer coefficient and the temperature difference driving the heat transfer were compromised due to the smaller header diameter and the reduced plate spacing. The 520mm wide radiators traditionally use a header diameter of 3½" with a plate spacing of 1.77" (45mm). These factors were overlooked and actual heat dissipation capacity only increased by about 5% to 10% per plate depending on the size of the radiator. In addition, the smaller header diameter and the corresponding loss in structural integrity, especially in long radiators with several plates, required additional bracing to prevent sagging. So transformer manufacturers were left looking for an improved product.

Based on market feedback, in 2005, a new 520mm wide radiator was conceived with 5" headers and an unspecified increase in plate spacing. Trantech used a finite element analysis software tool called FLUENT ® and several prototype tests in their lab to model oil flow characteristics. Several iterations of plate spacings, ripple patterns, and cross-sectional areas were tested to ensure maximum cooling effectiveness. In 2007, with lab development completed, numerous OEM transformer manufactures performed heat run tests using an E4 cooling package. Each test confirmed lab findings with an improved heat transfer coefficient of 18% to 22% using E4 transformer radiators versus traditional radiators.

Based on successful OEM test results, the E4 transformer cooling system was launched as a new product. Several transformer manufacturers have decided to use E4 as their standard cooling package. They recognize the benefits of the patent pending E4 product:

  • Increased header diameter on the inlet and exit path of oil.
  • Increased hydraulic diameter of the plate ripples for the same perimeter to reduce the friction factor for the oil flow.
  • Larger sump that conveys oil from the inlet header to the plates of the radiator on the inlet side and similar enlargement of the neck that conveys oil from the plates to the exit header on the outlet side of the radiator.
  • Increased plate spacing that increases hydraulic diameter in the plate for the same perimeter to reduce the friction factor for the external flow of air.

    In summary, the E4 radiator improves the overall heat transfer coefficient by approximately 18%-22% while maintaining the advantages of fewer valves and other connections. The economics of the enhanced heat transfer capability are realized by the reduced number of plates in each radiator or through a reduction in the total number of radiators used for the equivalent heat dissipation at the same specified hot oil temperature rise. Either option will ultimately reduce the overall cost of transformer cooling. For further information please contact: Trantech Radiator Products, Steve Blane - Sales Manager Email: Tel: 803-637-3166; ext. 207 Fax: 803-637-3046

    Company Information:
    Trantech Radiator Products
    1 Tranter Dr., P.O. Box 570
    Edgefield, SC 29824
    Phone: 803-637-3166
    FAX: 803-637-3046

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