INTRODUCTION TO FLEXIBLE HEATERS by kmb15358

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									INTRODUCTION TO FLEXIBLE HEATERS
Typical Applications of Flexible Heaters
OMEGALUX® is your dependable                   OMEGALUX products are available     OMEGALUX Silicone Flexible
source of precision flexible heater            in a wide range of materials and    Heaters are rugged, reliable,
products, and a unique source of               specifications. All undergo rigid   accurate, and moisture and
creative application design,                   quality assurance/quality control   chemical-resistant. They can be
engineering assistance, and                    testing to insure that OMEGALUX     easily bonded or adhered to other
manufacturing support.                         products meet our standards and     system parts.
                                               your application requirements.
OMEGALUX makes standard and                                                        OMEGALUX Silicone Flexible
custom-configured; Flexible                    You can improve heat transfer,      Heating Elements and Assemblies
Heaters, Assemblies, Drum & Pail               speed warm-ups and increase the     can be supplied in standard,
Heaters, Flexible Circuits and                 capacity for higher watt density    off-the-shelf configurations or
Flexible Heaters With Control                  with OMEGALUX Silicone              custom designed to your
Device Options (e.g. thermostats,              Flexible Heaters.                   individual specifications
thermistors, thermocouples, RTDs
and thermal fuses).




Storage Tanks                                  Process Vats and Dip Tanks          Heat Tracing Systems
Viscosity control and freeze protection for:   Heat raising and maintenance for:       Temperature control on special
Petroleum products                                 Plating                             vessels and valves where it is
     Caustic liquids                               Degreasing                          difficult to heat with cable or tape.
     Water                                         Rinsing
     Molasses
     Most stored liquids




Low Temperature Ovens                          Water and Feed Troughs              Conveyors
Process temperature control for:               Freeze protection for:              Freeze protection for:
    Curing                                         Water                               Coal
    Shrinking                                      Livestock feeds                     Ash
    Baking                                                                             Gravel

                                                            ®


 To Order, Call                                                 or Shop Online at omega.com SM                                 1
                                                                                                                                                                                                                                                                                       ELECTRIC HEATERS
APPLICATIONS GUIDE
Silicone Rubber/Fiberglass and
Kapton Insulated Flexible Heaters
Flexible heating elements have a wide                                                                                                                                        Kapton/FEP Film Insulation (see                               temperature control may be used. (See
range of industrial, commercial, and                                                                                                                                         pages M-7 through M-8) is ideal for very                      pages M-15 and M-16.)
military applications where reliability,                                                                                                                                     precise heating requirements such as
cost effectiveness, minimum cross-                                                                                                                                           satellites and aerospace equipment.                           Custom Engineered Heaters: Flexible
section, resistance to deterioration, and                                                                                                                                    Kapton, used from –328°F to +392°F, is                        heaters can be custom made to meet
basic flexibility are critical.                                                                                                                                              self-extinguishing, has double the                            your requirements for size, voltage and
                                                                                                                                                                             tensile strength of fiberglass reinforced                     wattage. Built-in thermostats can also
Silicone Rubber/Fiberglass Heaters                                                                                                                                           silicone rubber, and is not affected by                       be provided on request. For more
(see pages M-5 through M-8) are the                                                                                                                                          common solvents and fluids. Kapton is                         information, contact our engineering
most widely used flexible heaters.                                                                                                                                           almost 50% lighter than silicone rubber                       department.
Temperature rated from –70°F to                                                                                                                                              insulation and provides a 0.010”
+450°F, silicone rubber resists radiation,                                                                                                                                                                                                 The following information may be helpful
                                                                                                                                                                             maximum cross-section.                                        in determining precise heater
moisture, compression set, weathering,
vacuum, fungus, oils, solvents, and                                                                                                                                          Temperature Control: In the majority of                       requirements. To determine wattage
chemical attack. It may be factory                                                                                                                                           applications for silicone rubber and                          requirement see Section Z.
bonded or applied with silicone rubber                                                                                                                                       Kapton insulated heaters, some form of
RTV cement or pressure sensitive                                                                                                                                             temperature control must be used. See
adhesive systems. Various mechanical                                                                                                                                         Section P for temperature controls. In
fastenings are also available.                                                                                                                                               some applications, electromechanical
                                                                                                                                                                             thermostats or other types of

                                                     Heat Loss from Insulated Components
                                               1.4


                                               1.2                                                                                                                                                                        Specific Heats And Densities Of Common
                                                                                                                                                 e
                                                                                                                                               en




                                                                                                                                                                                                                                     Heat Sink Materials
                                                                                                                                              yr
  Heat Loss, Steady-State, from the Surfaces




                                                                                                                                            St
                                                      WATTS PER SQUARE INCH




                                                                                                                           ed
                                                                                                        )
                                                                                                     on




                                                                                                                         am




                                               1.0
                                                                                                   i
                                                                                                lat




                                                                                                                                                                                                                                     Comparison Of Materials
                                                                                                                       fo
                                                                                                 u




                                                                                                                  or




                                                                                                                                                       m
                                                                                              ns




                                                                                                                                                     oa
            of Small Components




                                                                                                                  s




                                                                                                                                                   ef
                                                                                                               as
                                                                                          oi




                                                                                                                                                 an                                                                                              Specific                  Density
                                                                                                            gl
                                                                                         (n




                                               0.8                                                                                             th
                                                                                                          re




                                                                                                                                  re                                             e
                                                                                                                                                                            en
                                                                                                        ib




                                                                                                                                yu                                      tyr                                  Material                             Heat*                  (lbs/cu in)
                                                                                                     'F




                                                                                                                              ol                                   ed
                                                                                                                                                                      S
                                                                                                   8'




                                                                                                                          '' P                                  am
                                                                                                 1/




                                                                                                                      1/8                             or
                                                                                                                                                           fo
                                               0.6                                                                                                s2 r°F
                                                                                                                                                        /in                                                  Aluminum & Its Alloys                0.23                     0.1018
                                                                                                                                              las
                                                                                                                                                /ft h
                                                                                                                              r             eg
                                                                                                                                           BTU
                                                                                                                  1/4
                                                                                                                      ''   Fib
                                                                                                                                   K=0
                                                                                                                                       .15
                                                                                                                                                      e
                                                                                                                                                                                                             Stainless Steels                     0.12                     0.2895
                                                                                                                                m               yren
                                                                                                                             foa           d St                                                              Carbon Steels                        0.11                     0.2827
                                               0.4                                                                       ane          ame
                                                                                                                     eth         or fo
                                                                                                                 lyur
                                                                                                       1/4 '' Po     Fibregl
                                                                                                                             ass
                                                                                                                                                           hr°F/in
                                                                                                                                                                                                             Copper Alloys                        0.10                     0.3231
                                                                                                               1/2''
                                                                                                                                                         2
                                                                                                                                                 BTU/ft                                                      Nickel & Its Alloys                  0.10                     0.3340
                                               0.2                                                                                      K=0.25
                                                                                                                              Styrene
                                                                                                                      oamed
                                                                                                         gl  ass or f                                                                                        Zinc & Its Alloys                    0.10                     0.2589
                                                                                                1'' Fibre

                                                0
                                                                                      100°F                                                                                            400°F
                                                                                                                                                                                                            *Btu/lb F for cal/gm C
                                                     0°F                                                         200°F                                      300°F

                                                                              Temperature Differential (temperature inside component
                                                                                minus ambient temperature in degrees fahrenheit)




                                                                                                                                                                   Fibreglass Insulated Heater                             The temperature shown is the internal
                                                                                                                                                                                                                           metallic element temperature. This
                                                                                                                                                                                                                           would be the hottest point of the heater.
                                                                                                                                                                                                                           The test heater was suspended
                                                                                                                                              500
                                                                                                                                                                                                                           horizontally in still air at a 70°F ambient
                                                                                                                                                                                                                           temperature.
                                                                                                                                                                                                                           Watt densities of up to 35 watts/in2 are
                                                                                                                                              400
                                                                                                                                                                                                                           possible when heaters are bonded to a
                                                                                                                                                                                                                           heat sink and controlled with a
                                                                                                                           Temperature °F




                                                                                                                                                                                                                           thermostat or electronic control.
                                                                                                                                              300




                                                                                                                                              200




                                                                                                                                              100




                                                                                                                                                                  1.0            2.0      3.0       4.0   5.0       6.0

                                                                                                                                                                                         Watt Density




                                                                                                                                                                                                                2
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