It is far from perfect, but my brew days have gotten easier and the results more consistent. I use the qt/(oz|lb) version for the entries rather than the L/(g|kg)Īs an aside, I do have to say I have grown rather fond of the GF.This profile is for the US/110v version.I have yet to find a definitive answer on an equipment profile for the Grainfather as GF doesn't really post a lot of the information necessary, similar profiles in other software are wildly off, and people have different ideas as what they should be (including me!) That said, I have attached a screenshot of my profile settings - please keep in mind that these work for me and shouldn't be misconstrued as "official" by any means. My primary goal with the profile was to get the resulting volumes to match up as close as possible with the numbers that come out of Grainfather's own online calculators - when I used their calculators, my brews came out as expected, when I didn't it was a total crap shoot. Notably, the boil-off rate is now 2qt/hr instead of 1.6, and the kettle deadspace is increased to 2.75 qt to account for what is left over in the counterflow chiller.Īfter quite a few brew sessions with my Grainfather, I feel that I have dialed in my equipment profile. The new numbers helpled my session on Saturday be spot on (though a little different than GF's online calculators). So the shrinkage is 1.Update: I've tweaked my numbers after: A) performing a few more brew sessions and B) doing a boil-off and kettle + chiller deadspace test. (23+2.5)*4% gives shrinkage of 1.02 litres plus 3.5 evap so 23+2.5+1.02+3.5=30.02 I may be confused hereĪny minute now I am going to feel a right idiot I am working the 4% shrinkage out after the evaporation of 3.5litres, was never good at maths at school and that was an awful long time ago. We are a liter adrift for some reason, not sure I follow the /.96 bit? I am working on a 50ml evap per minute which should equate to 3l an hour in the boil, so I can have the boil time as a variable on the spreadsheet. So for a bigger brew I would need to hold back from the sparge the litres over 30 in the preboil vol to add during the boil? I've raised this issue with them on numerous occasions but up until now they seem content to ignore me.ĭave, I have just knocked a spreadsheet up using your numbers, seems correct using your 27 litre and 90 minute boil, can you just check the figures I have got for a 23 litre brew and 70 minute boil.Īdding sparge and mash vol gives me my total liquor? 35.52 litres? I use these values every time and my brew length in the FV is almost always bang on. Pre-boil vol - Mash vol + (grain weight x 1.1). This amount will not fit in the GF all at once so I keep a little back and add during the boil. I usually do 27L brews with a 90 minute boil, so my pre-boil is:-Ģ7 + 2.5(dead space, not GF's value of 2) + 4.5 (3L per hour evaporation) + 1.2 (4% post-boil shrinkage) = 35.2L. That will not change for a given brew length and boil time. First work out what your pre-boil volume should be. Brewer: Luigi Cocci Batch Size: 5.55 gal Style: Czech Premium Pale Lager (3B) Boil Size: 7.43 gal Style Guide: BJCP 2015 Color: 4.3 SRM Equipment: Grainfather Bitterness: 33.0 IBUs Boil Time: 60 min Est OG: 1.054 (13.4° P) Mash Profile: Single Infusion, Full Body, Batch Sparge Grainfather Est FG: 1.012 SG (3.0° P) Fermentation: Lager, Single Stage ABV: 5.6 Taste Rating: 30. Consequently I always calculate my Sparge volume manually and ignore the GF calculation. It also doesn't take into account shrinkage due to post-boil cooling. That, in my experience is nearer 2.5L, probably due to losses in the CFC and it will vary in any case depending on how many hops are used. It should be 1.1, and the figure of 2L for dead space is also wrong. As mentioned above, 0.8 used for grain absorption is wrong. The GF calculation for Sparge volume is incorrect. Then with deadspace etc I am left with 22l in the fermenter. So after boil volume is something like 25l. I think the max volume the grainfather holds is 30l but that would be to the top I think a resonable max boil volume is 27l which takes into account the hot break when coming to boil. Although i have stopped using beersmith and just use the grainfather to create the recipe then this is then available on the grainfather connect app ready for sending to the grainfather (dont know if you already do this, appologies if you do ) I take it you mean beersmith? With that software you can indeed set it up for a grainfather and you could also address the issue with the absorbtion rate (this is easily changed in beer smith). Tried the Brewsmith trial, but couldn't really work out what it was telling me as total liquor was around 40 litres Thanks, its only the first brew and first non kit experience, so early days, just trying to work out how I get bigger FV quantity, I have 30l kegs to fill so 27 litres in the FV would be a good target.
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