Process Air Heaters
Overview
Heat processing applications vary widely from industry to industry. Curing, drying,
heat treating, comfort heating, sterilizing and bonding represent just a few of
the many uses for electrically heated air. Applications vary in temperature from
super cool cryogenic to high temperatures up to 1200°F. Chromalox electric heaters
can also be designed to heat special atmospheres such as argon or nitrogen. Special
materials and custom designs are available for marine applications, power plants
or hazardous applications.
Chromalox can supply individual fi nned elements for use in OEM equipment or entire
duct heater assemblies where we have complete control over the product including
the elements, frames and controls. Chromalox has earned an outstanding reputation
for exceptional quality, reliability and long life.
Finned Heating Elements
Fintube ® Elements —
The finned tubular design provides the same benefi ts as the finned strip heater
and additional features, allowing for special bending confi gurations to provide
higher concentrations of installed kW for a given area. The elements can be supplied
with bulkhead threaded fi ttings, and may include optional hermetically sealed terminals,
or extra heavy wall thickness for use in atmospheres containing hazardous fumes
or gasses. Element diameters of 0.315" and 0.475" are standard, with high
temperature aluminum painted steel sheath and furnace brazed fi ns being the most
common materials. Stainless Steel or MONEL ® sheath and fi ns are
also available for corrosive environments. Finstrip
® Elements — Superior to open coil elements, the heating
coil is completely encased in a metal sheath, minimizing a shock hazard due to accidental
contact with the heater. The rigid metal sheath minimizes hot spots and electrical
shorting, likely with open coil elements. Application temperatures to 565°F
are typical using fi nned strip units.
Duct Heater Assemblies
High Temperature — Type ADHT is designed
to provide outlet air temperatures up to 1200°F using conservatively rated,
low watt density, INCOLOY ® tubular elements. The heater includes
three inches of high temperature rated insulation below the mounting fl ange
to reduce heat transfer to the wiring enclosure. The elements are prewired and subdivided
into 48 Amp maximum circuits in compliance with the National Electrical Code. The
heater is provided with a Type “K” thermocouple attached to the sheath
of one element to be used with a Chromalox high limit control.
Medium Temperature — Application temperatures
to 750°F are common for ADH and TDH type duct heaters which feature INCOLOY
® sheath tubular heating elements. These versatile units are fully
assembled and prewired with the elements subdivided into 48 Amp maximum circuits
in compliance with the National Electrical Code.
Low Temperature — Outlet air temperatures
to 440°F are typical for types CAB, CABB and DAB which use fi nned strip heater
elements in an assembly which is then inserted in and bolted to existing ductwork.
Comfort Heating Duct Heater — Chromalox
DH Series duct heaters are complete custom duct heater systems which are listed
with the Underwriters Laboratory for comfort heating applications in commercial
and industrial buildings.
Process Air Heaters — Selection Guidelines
Type
|
Feature
|
Rating
|
KW Model
|
Page
|
Fintube®
|
0.475" Fintube® 0.315" Fintube® 0.475" Single End 0.315"
Single End
|
0.47 - 10
0.5 - 6.2
0.5 - 4.3
0.3 - 2.4
|
FTS & FTI
FTS & FTI
SFTS & SFTI
SFTS & SFTI
|
E-3
E-4
E-5
E-7
|
Finstrip®
|
Finstrip® Circular Strip
|
0.2 - 4.1
1.9 - 5.0
|
OTF
KSEF
|
E-9
E-11
|
Air Duct
|
Medium Temperature High Temperature Medium Temperature Low Temperature Round Duct
|
5 - 270
5 - 300
6 - 60
6 - 100
2.5 - 5
|
ADH
ADHT
TDH
CAB & CABB
DAB
|
E-12
E-12
E-16
E-17
E-19
|
Portable Blower Heater
|
High Temperature
|
30-60
|
SDRA
|
E-20
|
Tubular Air Duct Heaters (Specification Data Sheets)
|
|
E-23
|
Download the Process Air Heaters Selection Guidelines