Vacuum Insulation: Calculating Amount for 1 Bar

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Discussion Overview

The discussion centers around the calculation of insulation properties associated with a vacuum at 1 bar pressure, specifically in the context of thermal insulation, rather than vacuum insulated panels.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about a formula to determine the insulation capacity of a vacuum at 1 bar, clarifying that they are not referring to vacuum insulated panels.
  • Another participant questions what type of insulation is being referred to, suggesting possibilities such as heat or electrical ionization.
  • A third participant specifies that the insulation in question is thermal insulation.
  • One participant points out that 1 bar is atmospheric pressure and thus not a vacuum, and states that while it is possible to calculate heat transfer through convection, conduction, and radiation, these calculations depend on geometry and materials, indicating that no universal formula exists.

Areas of Agreement / Disagreement

Participants express differing views on the nature of 1 bar pressure and its implications for vacuum insulation, with no consensus reached on the existence of a formula for insulation calculations.

Contextual Notes

The discussion highlights the dependence of heat transfer calculations on specific conditions such as geometry and materials, which are not fully defined in the conversation.

bionic6manuel
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I would like to know if there is a formula or a way to determine the amount of insulation a vacuum of 1 bar can produce. please note I am not talking about vacuum insulated panels.
 
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insulation to what ?
heat ? electrical ionisation something else ??

cheers
Dave
 
Thermal insulaion
 
1 Bar is the atmospheric pressure, i.e. it is not a vacuum at all.

But regardless of the pressure: no there is no formula. It is of course perfectly possible to calculate the heat transfer due to convection, conduction and radiation; but all of these will depend on the geometry and the materials used.
 

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