Hot Sale UL Custom U W Shape Custom Finned Tubular Heaters
Why TUTCO
1. Heater is UL listed for Outdoor Applications
2. All of the limit controls in all TUTCO duct heaters are
automatic resets or are manually resettable. There are no devices
that have to be replaced when tripped.
3. In a horizontal airflow application, the airflow direction is
not specific; it can go either direction without any modification.
4. With our wire rack element suspension system, the heater coil is
less susceptible to airflow shading and allows a very small
pressure drop across the coils.
5. All TUTCO duct heaters carry a zero clearance rating for
installations into ducts.
Description of High quality Finned Tubular Heaters:
In applications where tubular heaters are exposed to forced
convection, placing fins around tubular heaters increases their
surface area and thus improves their heat transferring capacity.
Finned tubular heaters, compared to regular tubular heaters, run at
lower surface temperatures for the same watt densities when placed
in identical air streams. Graph1 compares watt density, outlet air
temperature, and the speed of air flow for regular and finned
tubular heatersrespectively. Despite their advantages, finned
tubular heaters are not recommended for applications where outlet
air temperatures exceed 600°F.
The physical characteristics of a finned tubular heater play a
major role in the effectiveness of its heat transfer. The table
below specifies the outside diameter of fins, their thickness, the
spacing between consecutive fins, as well as the element sheath and
fin material.
Application of Finned Tubular Heaters:
Dryers
Recirculation ovens
Fan-forced heaters
Heat treating and annealing
Construction of Finned Tubular Heaters:
The sheath material of a finned tubular heater and its watt density
are critical factors that affect its durability. The standard
finned tubular heaters are made of steel sheath and steel fins
(750°F maximum surface temperature) since steel is very efficient
in heat transfer. Finned tubular heaters have a plain-surface
finish. For corrosive environments or high-temperature applications
(above 750°F), finned tubular heaters can be made with stainless
steel sheath and stainless steel fins.
Watt densities of Finned Tubular Heaters:
Safe watt densities that keep surface temperatures below allowable
limits depend on the speed of the incoming air and its outlet
temperature.
Physical characteristics of Air Finned Heater:
The outside diameter of fins, their thickness, the spacing between
consecutive fins, and the element sheath and fin material all play
a major role in the effectiveness of heat transfer.
| Tube diam. | Fin thickness | Fins per inch | Fin width | Total in² per linear inch* | Max. sheath length* | Outside diam. of fins |
| 0.216" | 0.020" | 5 | 0.375" | 8.30" | 240" | 1.01" |
| 0.315" | 5 | 9.20" | 1.07" |
| 0.375" | 5 | 10.10" | 1.13" |
| 0.430" | 5 | 10.83" | 1.18" |
| 0.475" | 5 | 11.60" | 1.23" |
| *Dimensions are subject to change |
Optional features of Finned Tubular Heaters:
- Rustproof coating
- Stainless steel fins and tubular sheath material
- Nickel plating
- Special mounting accessories
- Various shape
Mounting attachments of Finned Tubular Heaters:
Threaded fittings, if required, are the standard mounting
attachments supplied with finned tubular heaters. These fittings
are brazed or crimped onto the heaters. For special applications,
finned tubular heaters can be made with mounting brackets that have
special designs.
