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The heating of an Industrial Process or Commercial appliance, most often requires specific element design. This makes it essential that the size, formed shape, power rating and watts density be considered to suit the application.

There are practical limitations to successful forming (bending) and to the safe load density. We would recommend therefore you call on the knowledge and experience of our staff to assist you in your element configuration.

What Do You Want To Know About Tubular Elements?

HOTCO tubular elements can be formed to an infinite number of designs and patterns.

Here are just a few examples:

LIQUID IMMERSION

Hot water and steam are required for numerous Industrial and Commercial applications. For a good percentage of these, an immersed tubular element is the most efficient. inexpensive and robust solution. It is essential however that the liquid properties, volume and surface loading all be considered in the final design. For this reason, in any new application - it is recommended that you contact HOTCO for further input.

• Corrosive solutions for plating baths and acid tanks
• Fresh and salt water for Aquaculture and Sterilising Equipment
• Waxes and other substances which require a higher temperature to become workable.
• Oils and like liquids which need to be heated gently.

Link to other Immersion Elements on this On-Line Catalogue

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AIR HEATING

In this type of process the system of heating relies on the element/s to heat the air surrounding them. The watts density is dependant on the temperature and the velocity (if any) of the air or gases passing over the element. Elements can be teamed up in banks for higher energy output.

• High temperature sealed Ovens
• Low Temperature drying / warming Ovens
• Hot Zone sealed chambers on conveyor systems
• Incubators and other warming cabinets

Link to other Infra-Red Process Heating via On-Line Catalogue

INFRA-RED & RADIANT HEATING

Radiant or Infra-red heat is utilised best in open applications where sealing the area is not possible or practical. They effectively heat solid masses which fall in the path of the radiant heat. For this reason it is more efficient to utilise radiant heat to heat a mass or object in an open environment.

• Curing ovens
• Open Conveyor systems
• Powder Coating / Paint drying processes

Link to other Infra_Red Process Heating via On-Line Catalogue

METAL HEATING

These elements are essentially designed to transfer energy (heat) onto or into a solid mass of metal. Elements can be either clamped on - or better still, cemented into a machined groove. HOTCO are leaders in this field and should you require advice, please don't hesitate to contact us.

• Clamped onto solid mass for heat transfer
• Cemented into machined grooves for direct mass heating - Hotrunner Manifolds

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PHYSICAL CONSTRUCTION

HOTCO Tubular elements consist of a resistance wire held centrally in a metal tube by compacted mineral insulation. A conductor rod is welded to both ends of the coiled resistance wire. The cold conductor rod in the tube should not be less than 40 mm.

BENDING RECOMMENDATIONS

Tubular elements are formed in their cold state by means of bending rollers. The connections between the terminal stud and the resistance wire must not lie on a bend. The bending diameter (Min Bend ID) should not be less than indicated in the table below 'Tubular Element Properties'.

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WHEN ORDERING SPECIFY

• Tube Diameter
• Material being heated
• The heated length in mm
• The cold zone in mm
• The voltage across the terminals
• The wattage
• The tube material and temper
• The terminals

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ELECTRO MECHANICAL TERMINATIONS

A B C DEFG

MECHANICAL FITTINGS

A B C D E F

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MACHINING DATA FOR HOTCO CEMENTED TUBULARS

HOTCO MANIFOLD PRECISION BENDING RECOMMENDATIONS

FORMULA POWER CALCULATIONS (Note: kJ/kgºK Steel = .502)

kW = (Mass in Kg) x (kJ/Kgº) x (Temperature Rise ºC) = RESULT ÷ 3600 + LOSSES

HOTCO manufactures its standard tubular elements at 40w/in² = 6w/cm²

FURTHER RECOMMENDATIONS

• Manifolds operating at higher temperatures (above 250°C) would be best suited for further technical advice from the HOTCO staff.

  Aim to track the tubular as close to a central position as possible in order to avoid excessive losses from the outer edge of the manifold.

  Locate temperature sensors ideally somewhere between the heat source and the colder outer zone.

  Take into account any large masses attached to the manifold that could absorb and drag energy from the manifold.

  To avoid excessive losses insulating the manifold.

  Ensure the terminal exit does not lie on a bend - contact HOTCO staff for clarification.

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HOTCO Head Office - PHONE (03) 9585 1944  -  FAX (03) 9585 0268 -  POSTAL PO BOX 611 CHELTENHAM VICTORIA AUSTRALIA