### Author Topic: Batch sparge efficiency  (Read 2008 times)

#### a10t2

• Official Poobah of No Life.
• Posts: 4519
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##### Re: Batch sparge efficiency
« Reply #15 on: March 20, 2017, 08:28:43 PM »
Can't find Seans forum name atm, but I wasn't aware he had an online version. Would have made my work a lot faster.

Don't worry, I found you!

I'm using a similar approach now, but when calculating lauter efficiency by the ratio of volumes, you need to account for the volume displaced by the sugar during the mash, which he appears to be approximating using the C=1/SG coefficient. I'll need to check out his source code, as my calculator, which matches kai's to a couple decimal places (floating points yo) is calculating a difference of 3-6% lauter efficiency. When I lower the absorption rate to 0.12, they're pretty close though (.5-2%). Which matches the apparent absorption rate using preboilvolume - strike / grist mass.

That all sounds correct to me, but to be honest I haven't looked at my own source code in 3+ years. I'll try to dig into it a little more tomorrow.
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#### Pricelessbrewing

• Assistant Brewer
• Posts: 174
##### Re: Batch sparge efficiency
« Reply #16 on: March 20, 2017, 08:51:42 PM »

Don't worry, I found you!

That all sounds correct to me, but to be honest I haven't looked at my own source code in 3+ years. I'll try to dig into it a little more tomorrow.

Oh well that works. Let me know if you find any issues or have any questions. There's a nice graph output, and calculator for measured vs expected on my  calculator too. I had been considering calculating the apparent boil off rate and absorption rate as you did, but ultimately decided against it.