heat exchanger finned tubular space heater air conditioner heater heating elements
Description
Incoloy 840/Stainless steel air electric fin tube heater heating element
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.
Immersion Heater Applications:
Duct Heater
Load Bank
Air Conditioning Systems
Oven
Burn Oven
Forced air duct heating
Specifications
PERFORMANCE CAPABILITIES
Sheath material | SUS304.321.316,Incoloy800.840 |
Resistance wire | NiCr2080 |
Maximum temperature | 1400 F ( 760C ) on alloy 800 sheath |
Maximum Watt density | 1-1.5KW/M ( Depending on whether there is a wind circulation ) |
Maximum voltage | 600VAC |
Wattage tolerances | +5 percent, -10 percent |
Resistance tolerance | -10 percent, +5 percent |
Minimum diameter | 6mm |
NOTICE
The two most critical factors that affect the durability of a tubular heater are:
1.The sheath material of the tubular elements.
2. Watt density, flow velocity, outlet temperature.
The sheath material type of a tubular heater depends on the operating temperature and the corrosivity of the medium within which the heater will operate. The watt density distribution on the surface of a tubular heater is critical for two reasons. First it determines the temperature that a heating element sheath will attain within the conditions that the heater is subjected to. The second reason is that every material has a specific maximum watt density that it can tolerate during its heating cycle.
Tab1 : list various sheath materials, maximum allowable temperatures and mediums within which they are recommended to operate.
Tab2 : list recommended maximum watt densities and medium for different materials.
Tab1
Sheath Material | Maximum Sheath Temperature | Applications |
Copper | 350 F (170 C) | Immersion into water ,non corrosive low viscosity liquids |
Steel | 750F (400 C) | Oil, wax, asphalt, cast in aluminum or iron |
Stainless Steel 304-316 | 1200 F (600 C) | Corrosive liquids, food industry, sterilizers |
Incoloy | 1500 F (815 C) | Air, corrosive liquids, clamped to surfaces |
Tab2
Sheath Material | Maximum Watts/cm2 | Medium |
Copper | 7 W/cm2 | Water, weak acid liquid |
Copper | 2.5 W/cm2 | Food oil, lubricating oil, hydraulic oil |
Stainless Steel 304-316 | 11 W/cm2 | Water, weak acid liquid |
Stainless Steel 304-316 | 2.5 W/cm2 | Food oil, lubricating oil, hydraulic oil |
Stainless Steel 304-316 | 5 W/cm2 | Still air |
Stainless Steel 304-316 | 5.5 W/cm2 | Flow rate is not low 6m/s air |
Stainless Steel 304-316 | 13 W/cm2 | cast in aluminum or iron |
Incoloy | 10 W/cm2 | Still air |
Incoloy | 11 W/cm2 | Flow rate is not low 6m/s air |
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