Heat exchange features

Fins

Aluminium fins are standard for all fin profiles. Copper tubes with aluminium fins offers the best balance between cost and heat transfer capabilities. Extruded fin collars ensure optimum heat transfer by ensuring maximum tube contact and accurate fin spacing.

Aluminium (standard), Pre-Coated Aluminium (‘Blue Fin’) and Copper material options are available
Corrugated (standard), straight, louvered, sine wave, and lanced sine wave profiles are available. These fin profiles enhance the heat transfer process by increasing the coil surface area and airflow turbulence.

Tubes

All heat exchangers are produced with a staggered tube design. This provides a highly efficient airflow pattern that minimises air friction; helping to reduce fan kilowatt requirements. Tubes are mechanically expanded into the fin collars to provide maximum bonding.

Pure seamless copper tubing and return bends.
5mm OD, 1/4” OD (6.35mm), 7mm OD, 5/16” OD (7.94mm), 3/8” OD (9.5mm), 1/2″ OD (12.7mm), and 5/8” OD (15.9mm)
Plain bore or rifle bore (inner-grooved) tubes.

Return Bends

Efficient circuiting is achieved through extensive use of pure copper U-bends. All bends have a smooth opening to ensure uniform water flow throughout the coil. Hairpins are available up to certain coil lengths, contact our office to discuss your requirements.

Brazing

All joints are hand brazed with a generous amount of silver brazing alloy within a nitrogen environment. This eliminates oxidisation, ensuring a clean weld free of impurities and improves the service life of the heat exchanger.

Vent and Drain Valves

Vent and drain valves are fitted as standard equipment on all coils to help achieve effective bleeding of air. As all coils arrive pre-charged with nitrogen, this allows the customer to perform a simple pressure test before installation.

Fully Collared Support Plate Holes

In addition to collared fins, all end and middle support plates have fully collared holes. This eliminates tube erosion damage that can result from thermal expansion.

Headers

Heavy wall seamless copper tubing is used on all headers. The headers are generously sized for low fluid pressure drop and uniform fluid flow.

Fittings & Connectors

All fittings and connectors are made from copper. Standard positions exist with the ability to tailor the design to customer requirements.

Handing

The correct mounting orientation of the heat exchanger is essential to:

  • Achieve thermal counter-flow for optimum heat transfer.
  • Ensure coil is self-draining and vents air effectively.

Frame

  • The standard frame material is galvanised steel with aluminium and stainless steel frames also available.
  • The standard frame material thickness is1.6mm, with other sizes available.
  • Intermediate tube supports are standard equipment on all longer heat exchangers.

Protective Coatings

  • All heat exchangers have a proprietary coating ‘Standard Finish’ applied as a standard finish. This coating helps to protect the coil from general weathering and mild coastal conditions.
  • For a greater level of protection, Blue fin and Epoxy Cote treatments are available. These finishes provide a greater degree of protection in harsh operating environments.

Testing

  • All heat exchangers are manufactured to ISO 9002 quality standards.
  • All heat exchangers are tested to a pressure of 3,450 kPa with dry compressed air whilst submersed in warm water.
  • All heat exchangers are manufactured in strict accordance to ARI (Air-Conditioning & Refrigeration Institute – USA) specifications to guarantee the accuracy of performance data.

Packaging

  • Following quality testing, all heat exchangers are dehydrated, charged with dry nitrogen, and sealed for transport. This serves as your guarantee that all heat exchangers will be “leak free” when they reach your installation site .
  • All packaging is fully enclosed export quality wooden packaging. Each case is manufactured to suit the heat exchanger dimensions, this ensures all heat exchangers are tightly packed and protected from transport mishandling.
  • Each heat exchanger is clearly labelled for easy identification and future reference