evaporation
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I've recently got a new stainless steel kettle that is double the size of my last and I am trying to work through some of the issues, well one issue: evaporation. I was a little worried about the evaporation rate on this boiler. It has an element fitted to it and it's allot more powerful than my last one so
I gave it a test run with 25 liters (This would be a usual pre boil volume for 90minutes on my old system for a 20 liter batch). The boil off rate was pretty high and I lost 6 liters over the 90 minutes.
I figured this in to the equation on brew day and rather annoyingly my losses were nowhere near what they were on my test run and I lost 10 gravity points. I realise now that for a good portion of the boil I had the kettle lid on 3/4 so that didn't help. I also realise this isn't ideal as you need to drive out DMS.
Even with the lid on like that, loosing only 3 liters is confusing. I amost feel silly typing this but it is something I wondered: Being allot denser, does wort evaporate differently than water?
Thanks for your help
G
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