FINNED TUBULAR HEATERS :
MAGMA Tubular heating elements are the most versatile and the best suited solutions to a large number of applications. Inside the metal tube, a heater coil is embedded and electrically isolated in highly compressed magnesium oxide. The optimized structure and very high density of the magnesium oxide form the basis for the excellent mechanical and thermal characteristics of the MAGMA Tubular Heating Elements. They can also be fitted with thermostats and temperature limiters in most applications. Tubular heating elements perform exceptional heat transfer by conduction, convection or radiation to heat liquids, air, gases and surfaces. Bends are made to customer requirements.
Tubular elements from MAGMA are factory-configured to almost any shape or size. Custom bending diameters can be made upon request. Typically using steel, stainless steel, Incoloy, inconel or titanium alloys, tubular elements are often regarded as the foundation of all heating elements. These heating elements have a strong outer sheath to help protect the heater from physical stress and uses high quality alloys to allow efficient heat transfer from resistance coil to your heating medium.
Careful selection of materials, precise manufacturing techniques as well as numerous tests and inspections ensure that our Tubular Heating Elements conform to high quality standards and offer an exceptionally long service life.
Placing fins around tubular heaters increases their surface area and thus improves their heat transferring capacity. Finned tubular heaters run at lower surface temperatures for the same watt densities when placed in identical air streams. The physical characteristics of a finned tubular heater play a major role in the effectiveness of its heat transfer.
Durability of finned tubular heater is affected by two critical factors i.e. sheath material and its watt density. As steel is very efficient in heat transfer the standard finned tubular heaters are made of steel sheath and steel fins (750°F max. surface temperature). These heaters have a plain-surface finish. Finned tubular heaters could be made with stainless steel sheath and stainless steel fins for corrosive environments or high temperature applications (above 750°F). Safe watt densities that keep surface temperatures below allowable limits depend on the speed of the incoming air and its outlet temperature.
Finned heaters are suitable:
to heat stagnant air
for heating circulating air and air flows
for gas heating
for heating of air ducts
as pre-heating unit in machines
in air-conditioning ducts
in industrial furnaces and drying chambers
for shrink packaging machines
heating elements in air heaters
Despite their advantages, finned tubular heaters are not recommended for applications where outlet air temperatures exceed 600°F.