Determination of the overall brewhouse yield during wort production in order to monitor brewhouse operations
Wort from the midpoint of chilling/pitching wort
Since determination of the hot wort yield can be problematic and the cold wort yield as described above does not represent a measure of the total extract obtained from the grain bill, an attempt has been made to record all of the extract recovered, with the exception of that remaining in the spent grain. This value is then compared to the laboratory yield. The result is expressed as the total yield (overall brewhouse yield) (OBYCW) in %.
Determination of the brewhouse yield/hot wort yield in order to evaluate brewhouse operations
Cast-out wort after the completion of wort boiling prior to hot break separation
The brewhouse yield/hot wort yield represents the extract present in one batch of wort relative to the raw materials used to produce the wort. The malt, any supplements added to the mash, and brewhouse operations determine brewhouse yield.
An assessment of brewhouse operations and processes is possible through comparison with the laboratory yield, prepared using the same malt and supplements in the mash. However, the brewhouse yield does not allow a distinction to be made regarding where extract losses occur in the brewhouse, i.e., whether they stem from the mashing or lautering process and in which proportions. For this, a spent grain analysis is required.
Determination of the cold wort yield in order to monitor brewhouse operations
Wort from the midpoint of chilling/pitching wort
Instead of brewhouse yield, quite often the cold wort yield is calculated. Cold wort yield is particularly recommended for wort produced using adjuncts. Extract yield is understood as the amount of extract in a batch of wort relative to the amount of extract in the raw materials used to produce the wort.
Determination of the fermentation cellar yield in order to monitor brewhouse operations
Wort from the midpoint of chilling/pitching wort
The fermentation cellar yield is calculated using the value determined for the amount of extract contained in a batch of wort relative to the amount of extract present in the raw materials used to produce the wort.
Malt intended for use in beer brewing or elsewhere in the food industry
The moisture content of malt is determined through the loss in mass during a standardized drying process, in which ground malt is dried at a defined temperature within a specified time in an electrically heated drying oven. The moisture content is determined through the difference in the weight of the malt prior to and after drying.
It should be borne in mind that allowing the weighed sample of ground malt to stand for any length of time prior to performing the analysis can alter the outcome, depending upon the humidity in the air. For this reason, it is recommended that the analysis be carried out immediately after grinding the malt.
For rapid methods, refer to analysis methods R-110.40.022 Moisture Content in Barley – Infrared Drying to R-110.40.183 Moisture Content in Barley – NIT (Verweise).
This method describes how to mill grain or malt to produce fine or coarse grist.
Malt intended for use in beer brewing or elsewhere in the food industry
Malt is ground between two horizontally positioned, grooved discs. The lower disc is driven by an electric motor and rotates at approx. 1500 rpm; the upper disc is fixed and therefore does not move. During the milling process, the malt migrates from the center of the discs to the outer edge, where the grist falls through an outlet spout into a grist beaker.
The gap between the discs can be adjusted by turning a socket head screw on a calibrated ring bearing scale markings. The scale on the calibrated ring ranges from 0 to 20, with each scale division corresponding to a gap between the discs of 0.10 mm. Each scale division is subdivided into five smaller divisions; each of the smaller marks is equivalent to 0.02 mm. Two gap adjusting rings ensure reproducible mill settings.