Batch Sparge Calculator Online

bitter_dave · Post by **bitter_dave** » Fri Jul 13, 2007 3:36 pm

Well I have to say that's very nifty. Much more-user friendly than the normal pages of formula

Well done DaaB and EB

SteveD · Post by **SteveD** » Fri Jul 13, 2007 4:40 pm

Very good. Well done

prodigal2 · Post by **prodigal2** » Fri Jul 13, 2007 5:05 pm

Gentlemen all I can say is brilliant,

mixbrewery · Post by **mixbrewery** » Fri Jul 13, 2007 6:04 pm

Excellent dudes!

This makes it all so simple now, cracking job....

Vossy1 · Post by **Vossy1** » Fri Jul 13, 2007 6:55 pm

Lovely bit of work guys...well done

Garth · Post by **Garth** » Fri Jul 13, 2007 8:09 pm

very useful, good work chaps

DRB · Post by **DRB** » Fri Jul 13, 2007 10:18 pm

roger the dog · Post by **roger the dog** » Fri Jul 13, 2007 10:20 pm

Great work chaps, thanks

iowalad · Post by **iowalad** » Sat Jul 14, 2007 1:24 am

Outstanding work!

eskimobob · Post by **eskimobob** » Sat Jul 14, 2007 10:16 pm

I just did a bit of tweaking really - t'was all DaaB's idea

Niall K · Post by **Niall K** » Sat Jul 14, 2007 10:47 pm

That's cool Daab. Very handy indeed. Would it be possible to add Percentage Loss During Boil per hour (e.g. 15%) and then total boil time in hours? Just my 2 cents

Ross · Post by **Ross** » Sat Jul 14, 2007 11:30 pm

Good work daab & eskimobob - Unfortunately it still appears to have the same problem IMHO that other calculators have, in that it calculates boil loss as a percentage of volume, rather than litres per hour. If you put 1L in your kettle & boiled for 90 mins the kettle would be dry - likewise if you boiled a double batch, your boil off would not double. Boil loss is consitant to kettle design/heat applied & not the volume in it.

cheers Ross

Ross · Post by **Ross** » Sun Jul 15, 2007 12:19 am

DaaB wrote:I don't see how boil loss can be measured in L per hour as this will increase as the wort evaporates (unless of course you can reduce the heat as the volume decreases). It can be easily changed but I think % is a good compromise, besides the better homebrewing publications over here suggest aiming for a 10% per hour loss so that fits in with the way the calculator is set up.

% works fine for similar sized brews on the same system, but if you double your wort size to make a double batch, your boil loss does not double, it remains basically the same...

cheers Ross

Graham · Post by **Graham** » Sun Jul 15, 2007 1:04 am

In my humble view, Ross is correct. A fixed amount of energy into a system will boil off a fixed amount per hour, irrespective of how much volume there is to start with. A larger volume will take longer to get to the boil, but once it gets to the boil, the evaporation rate will be the same for the same amount energy going in. Assuming you ignore heat losses elsewhere, through the walls of the vessel for example, and an approximate figure would be 1.6 litres per hour per kilowatt of input.

However, traditionally it is typical for British brewers, even commercial ones, to talk in terms of percentage per hour.

Ross · Post by **Ross** » Sun Jul 15, 2007 10:42 am

Daab,

If you have to readjust your % when changing your size boil size, then it partly defeats the object of having a calculator to work things out for you; but yes it can be calculated by hand, as can everything else the calculator does

. I was purely offering some input on a point that has frustrated brewers using other programmes - If you don't wish to implement it fine, it's your project, I'm just surprised you aren't able to see the advantage...

cheers Ross

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Batch Sparge Calculator Online