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Legume
Scientific


Registered: 11/15/19
Posts: 12
Loc: North America
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Re: Vacuum Desiccation (drying) [Re: HighDesert]
#26511348 - 03/01/20 12:40 PM (3 years, 10 months ago) |
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@Highdesert - what vacuum did you pull with that Robinair hvac pump? Did you stop (say worried about Mason Jar?) or let it pull a hard vacuum?
The Robinair and similar HVAC pumps are designed to pull a hard vacuum as HVAC needs that for absolutely minimal contamination in the lines. My only complaint about them is that they will mist oil vapor so should be run outside and perhaps with a rag over the handle.
A sturdy metal mixing bowl makes a great vacuum chamber bottom. I've used mine for years without issue for other vacuum purifying needs.
You can also use 3/4" high quality plywood or a solid board. Thoroughly polyurethane it. It will still be a bit "leaky" but the Robinair (not a vacuum bagger) can easily keep up with some leakage.
So mixing bowl, plywood square (or thick plexi), a few fittings, and one is set.
Top it with a 12x12 chunk of 1/2" Plexi (or thicker) and you can carefully drill and tap *one* hole dead center. Hang all your fittings and gauges off of that one tap off. Make a gasket with RTV or Home Center rubber sheeting, such as for shower liners and such works great. I'm sure you can be creative.
My concern is will a hard vacuum remove desirable volatile compounds? For some of what I degas (composites) the hard vacuum pulls out some volatile compounds (curatives) I need.
-------------------- Master to few; padawan to many.
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Holybullshit
Stranger
Registered: 01/06/19
Posts: 1,551
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Re: Vacuum Desiccation (drying) [Re: jbgtaa]
#27884927 - 08/01/22 04:58 AM (1 year, 5 months ago) |
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Quote:
Brian Jones said: I’ve had a space heater running in my apartment since the beginning of November and haven’t seen an increase in My electric bill.
You don't have air conditioning?
Even if you don't have any type of AC, energy rates may change seasonally where you are...with rates in the summer typically the highest due to AC usage.
Because at 1,500 watts(which it likely only uses on it's highest setting), if it runs say 8 hours a day that's 12kwh.
At 0.20/kwh that would be almost $2.50 a day.
So depending on the energy market that could be anywhere from $50-80 a month, more if you run it longer.
Running a 400w dehumidifer 24 hours a day would be ~10 kwh.
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Back on topic, I wonder if freezing the mushrooms first would make a vacuum oven work better. Or if the OPs vacuum chamber had enough air exchange to work properly. The inside of the chamber could have been reaching 100% RH rather quickly...removing a few grams of moisture into the air in the chamber in the first hour(or less) but then essentially becoming saturated.
Purpose built vacuum ovens may have electronically controlled air exchange, periodically opening an air inlet valve for new(dry) air, or different running modes and calibration settings to obtain the necessary conditions for your application even if operating in continuous mode...
Edited by Holybullshit (08/01/22 05:48 AM)
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