관형 발열체
Design And Structure:
Tubular heating elements consist of a metal sheath, an electrical resistance heating coil (usually made of nichrome or other resistance alloys), and insulation material.
The metal sheath protects the heating element from the surrounding environment and is chosen based on the application requirements.
Watt Density and Sheath Material:
Two pivotal elements influencing the longevity of a tubular heater are the sheath material and watt density. The choice of sheath material is contingent on the operational temperature and corrosiveness of the surrounding medium. Meanwhile, the watt density distribution on the heater’s surface holds paramount importance for two reasons.
Firstly, it dictates the temperature reached by the heating element sheath under prevailing conditions.
Secondly, each material has a distinct maximum watt density it can withstand during the heating cycle, underscoring the critical role of watt density in the heater’s durability.
Recommended maximum watt densities and medium for different materials:
| Sheath Material | Maximum Watts/cm2 | Medium |
| 구리 | 7 w/cm2 | 물, weak acid liquid |
| 구리 | 2.5 w/cm2 | Food oil, lubricating oil, hydraulic oil |
| 스테인레스 스틸 304-316 | 11 w/cm2 | 물, weak acid liquid |
| 스테인레스 스틸 304-316 | 2.5 w/cm2 | Food oil, lubricating oil, hydraulic oil |
| 스테인레스 스틸 304-316 | 5 w/cm2 | Still air |
| 스테인레스 스틸 304-316 | 5.5 w/cm2 | Flow rate is not low 6m/s air |
| 스테인레스 스틸 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 |
Variety Of Configurations:
Tubular heating elements come in various shapes and sizes, including straight, bent, or coiled configurations to suit different applications.
They can be designed to fit specific applications, such as immersion heaters for liquids, air heaters for drying applications, or radiant heaters for space heating.
장점
Tubular heating elements are versatile and can be custom-designed to meet specific heating requirements.
They provide efficient and uniform heat distribution.
They are relatively easy to install and replace.
응용:
Immersion Heaters: Used to heat liquids, such as water, oil, or chemicals, in tanks or containers.
Air Heaters: Employed in heating systems for drying processes or space heating.
Ovens and Furnaces: Used for industrial and domestic ovens, kilns, and furnaces.
Appliances: Found in various household appliances like washing machines, dishwashers, and coffee makers.
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