Rradiators at high temperatures

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SUMMARY

This discussion focuses on the thermal dynamics of radiators operating at high temperatures, specifically analyzing the transition from convection to radiation as the temperature increases beyond 373K. It is established that conventional radiators primarily utilize convection for heat transfer at normal operating temperatures. However, when temperatures exceed 1000K, such as with materials designed to withstand extreme heat, the heat transfer mechanism shifts predominantly to radiation, as evidenced by infrared heat lamps that emit over 80% of their energy as radiation at temperatures around 2000K.

PREREQUISITES
  • Understanding of heat transfer mechanisms: convection and radiation
  • Familiarity with temperature scales, particularly Kelvin
  • Knowledge of materials that can withstand high temperatures
  • Basic principles of thermal dynamics
NEXT STEPS
  • Research the properties of materials suitable for high-temperature radiators
  • Study the principles of thermal radiation and its applications
  • Explore the design and efficiency of infrared heat lamps
  • Investigate the impact of temperature on heat transfer efficiency in various systems
USEFUL FOR

Engineers, physicists, and designers involved in thermal management systems, as well as anyone interested in the efficiency of heating technologies at elevated temperatures.

RJWills
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Okay so I've been have a good think about radiators and how they work, in particular the fact that conventionally they work via convection with a bit of radiation at normal temperatures.

But say my radiator is made out of some fancy metal that can withstand extreme temperatures, if I to say whack the temperature from 300-373K (a rough 'normal' operating temp zone) to 1000K+, would my nice convection based radiator transfer its energy primarily by convection, or would it begin to transfer energy primarily by radiation with a bit of convection? If it does change, then why does it?
 
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There are infrared heat lamps that use a filament which can reach temperatures around 2000°K. These release a lot more radiation than the typical "radiator" heaters. In fact, they can release over 80% of the power input as radiation, releasing the rest in the form of conduction and convection.
 

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