Building a Vacuum Oven: Help Needed w/ Heat Flow & High Temp Seals

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SUMMARY

This discussion focuses on building a vacuum oven capable of reaching temperatures between 750-800 °F, utilizing a highly corrosive resistant vacuum pump. The user seeks to understand heat flow dynamics to determine the suitability of high-temperature polymer o-rings for sealing, as well as alternatives for airtight seals on the door and quartz window. Key considerations include calculating maximum temperatures on the oven's sides and top, and recognizing the significant impact of heat transfer by radiation and pressure differentials in high-temperature applications.

PREREQUISITES
  • Understanding of heat transfer principles, including conduction, convection, and radiation.
  • Familiarity with vacuum systems and their operational characteristics.
  • Knowledge of high-temperature materials, specifically polymer o-rings and their thermal limits.
  • Basic mechanical design principles related to pressure containment and sealing mechanisms.
NEXT STEPS
  • Research heat transfer calculations for non-standard geometries in vacuum environments.
  • Explore high-temperature sealing materials suitable for 750-800 °F applications.
  • Learn about the effects of pressure differentials on mechanical design and material selection.
  • Investigate radiation heat transfer and its implications in high-temperature systems.
USEFUL FOR

This discussion is beneficial for engineers, DIY enthusiasts, and researchers involved in high-temperature vacuum applications, particularly those focused on thermal management and sealing solutions in mechanical designs.

ChaseRLewis
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I'm building a vacuum oven since I found an industrial highly corrosive resistant vacuum pump and a few boxes of the oil it needs all for about $50. I have the general outline of what I want to do, but I have a couple questions.

1. I plan on this oven reaching about 750-800 °F max on a central platform in the center. My thought is the vacuum shouldn't conduct much so I just have to worry about heat flow from the platform to the bottom of the oven. So that should keep the sides a bit cooler but I'm not 100% sure that's correct thinking and would like to calculate the max temperature the side of the oven and top of the oven would reach. Main reason for this is so I can determine if high-temp polymer o-rings can be used on certain sections. Don't have much of an idea of how to calculate that odd geometrical path of heat flow.

2. If polymer o-rings are out of the question I need an air tight seal on the door and quartz window. Any ideas? The pressure difference when opperating is only going to be about 14psi but I'm out of my expertise when dealing with high temp applications.
 
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ChaseRLewis said:
1. I plan on this oven reaching about 750-800 °F max on a central platform in the center. My thought is the vacuum shouldn't conduct much

Don't forget about heat transfer by radiation. And for your mechanical design, don't forget that "only 14 psi" is the same as "nearly 1 ton per square foot".
 
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i need to know what roll torque means and how it can be countered?
 

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