Evaporation Rate?

[Kingy]

im trying to set my equipment on beersmith but dont know how to get evaporation rate

my starting boil volume was 38.91 litres and ended up with 25.14litres after 90 minute boil and no chilled it all into the fermenter. How do i work out my evaporation rate?

cheers kingy

p.s not a bad guess seen as tho i was aiming for 25litres

 

[Steve]

im trying to set my equipment on beersmith but dont know how to get evaporation rate

my starting boil volume was 38.91 litres and ended up with 25.14litres after 90 minute boil and no chilled it all into the fermenter. How do i work out my evaporation rate?

cheers kingy

p.s not a bad guess seen as tho i was aiming for 25litres

Kingy - have a read of this one im sure sometone explained how to work it out:

http://www.aussiehomebrewer.com/forum/inde...;hl=evaporation

Cheers
Steve

 

[therook]

im trying to set my equipment on beersmith but dont know how to get evaporation rate

my starting boil volume was 38.91 litres and ended up with 25.14litres after 90 minute boil and no chilled it all into the fermenter. How do i work out my evaporation rate?

cheers kingy

p.s not a bad guess seen as tho i was aiming for 25litres

If i'm working this out correct, thats close to 36% over 90 minutes , which is 24% hour

which is a big bloody boil, you must have waves in your boiler



Rook

 

[Kingy]

just worked it out at 21.8% the hopsock did hold a bit at the end iwas in a hurry i should of measured that as well.

My boil is only just boiling very smoothly

cheers kingy

 

[Screwtop]

im trying to set my equipment on beersmith but dont know how to get evaporation rate

my starting boil volume was 38.91 litres and ended up with 25.14litres after 90 minute boil and no chilled it all into the fermenter. How do i work out my evaporation rate?

cheers kingy

p.s not a bad guess seen as tho i was aiming for 25litres

kingy, post #58 explains it perfectly Here

Cheers,
Screwy

 

[Kingy]

quote:
For example, if the beginning volume is 7.5 gallons (28L), the ending volume is 5.5 gallons (21L) and the boiling time is 90 minutes, the evaporation rate is 1.33 gallons (5L) per hour.
quote:

going of this he boiled off 7 litres over 90 mins, that equals to 4.66 over 60 mins is this right?
then 4.66 litres of starting volume of 28 litres is 14.6% evaoration rate?

geez my head hurts now, time for a beer :chug:

cheers kingy

 

[therook]

Kingy,

all i did was divide your finishing volume by your starting volume , multiplied by 100 to give you tour finishing percentage and then subtracted that from 100 to give you your loss in a percentage over 90 minutes. divide that by 3 and that breaks it down into 30 minutes boil offs..

I think i have just confused myself

rook

 

[Stuster]

Volume evaporated divided by initial volume is percentage evaporated times 100 (to give a percentage). This percentage divided by the time gives you the percentage evaporation per hour.

So Volume evaporated is 38.91-25.14=13.77
Percentage evaporated is 13.77/38.91*100=35.39
Percentage evaporated per hour is 35.39/1.5=23.59

So let's say 24%.

Pretty high percentage BTW. Was it a fast and furious boil?

 

[Kingy]

nah it just rolls along sometimes its barely rolling. I put it down to my pot its an 80 litre robinox @ 490mm wide. Im mashing another brew now so ill do some more measurments and see if anything changes from this mornings brew.

cheers kingy

 

[Screwtop]

nah it just rolls along sometimes its barely rolling. I put it down to my pot its an 80 litre robinox @ 490mm wide. Im mashing another brew now so ill do some more measurments and see if anything changes from this mornings brew.

cheers kingy

You need to use the total final volume, including whats left in the boiler in trub etc, not what you end up with in the fermenter.

 

[Kingy]

yep done that i measured with a ruler before i no chilled into the cube,trub and all