CookiePie1 wrote:wec01 wrote:JonB wrote:
I feel that would be so difficult to keep consistent due to the difficulty of making sure there actually is a vacuum created within the device walls. Did they keep the vacuum bag on it during testing??
But, if it works, great!
I didn't see it in action, but it was a rigid container rather than a bag and it had a barometer which I assume helped with consistency.
The problem with homemade vacuum devices is that they are very unpredictable. Sure, it might work really well, but if there's an issue with the vacuum, it leaks and your prediction is messed up.
This was the problem we ran into when Thermo was an event years ago and only natural products could be used as insulation. We honestly put a good amount of time and effort into the idea of a vacuum device but never got it to work as well as we were hoping. Almost impossible to keep the vacuum and very difficult to tell if the vacuum is maintained. I honestly think it is possible, but the amount of time it would take to build a predictable device could (and probably should) be used for testing and data collection of a device that is simple and gives results that are easy to replicate given the same parameters (water volume, temp, etc).