BREWING CALCULATIONS& CONVERSIONSBREWHOUSE CALCULATIONSBrewhouse efficiency %(Extract Produced/Potential Extract) x 100y Extract produced is calculated from wort collected in the fermenter.y Potential extract is the combined total extracts of malt & adjunct used defined by their laboratory “as-is” yields. For maltthis is the fine grind yield.Extract in degrees Plato (ºP) to lb/USBBL((259 + ºP) ºP)/100Calculated S.G. 1 + (ºP/(258.6–((ºP/258.2) x 227.1)))Volume of Grist:100 kg malt grist occupies 1.07 hL volumeVolume of Hops:1 kg of hops displace ~ 15 liters of wort1 kg of hops in hopback/whirlpool retains 6 liters of wort after drainedInitial mash temperature:I = (((S x Tg) + (M x T1))/(M + S)) + ScI=S=Tg =M=T1 =Sc =Desired mash temp (ºC or ºF)Specific heat of grist (see table below, water = 1.00)Temperature of malt grist (ºC or ºF)Mash water: grist ratio (hL/100kg)Water temperature (ºC or ºF)Net slaking heat correctionMaltMoisure %MaltSpecificHeat01234680.380.380.390.40.40.410.42Net SlakingHeat CorrectionoC3.12.62.32.11.71.31.1oF5.54.74.13.73.12.32Example: A malt grist with 3% moisture and 30ºC is mashed in with 60ºC water at the ratio of 3.0 hectoliters per 100 kg grist.What is the initial strike temperature going to be?I = (0.40 + 30) + (3 x 60)+ 2.13.0 + 0.30= 65.9ºC is the strike temperature of the mash105
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