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This is the complete lecture note for BST512 Brewing Calculations and Plant Design. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS • Course code: BST512 • Course title: Brewing Calculations and Plant Design • Course credit load: 2 Series 1: Brew-House Calculations and Efficiency Series outline 1.1 Grist Weight and Wort Volume • 1.1.1 Definition and importance of grist weight • 1.1.2 Calculating wort volume in brewing operations • 1.1.3 Relationship between grist composition and wort yield 1.2 Extract Yield and Hop Rate • 1.2.1 Concept of extract yield and its measurement • 1.2.2 Factors influencing extract efficiency • 1.2.3 Hop rate calculation and its impact on flavour balance 1.3 Time and Energy Utilisation in Brewing • 1.3.1 Brewing time management and process scheduling • 1.3.2 Energy requirements in mashing, boiling, and cooling • 1.3.3 Strategies for improving energy efficiency Introduction Brewing is both an art and a science, and at the heart of this process lies the ability to calculate and manage the efficiency of the brew-house. Every successful batch of beer depends on accurate measurements of raw materials, careful monitoring of volumes, and effective utilisation of time and energy. Without these calculations, brewers would struggle to achieve consistency, quality, and economic viability in their production. The aim of this Series is to equip you with the knowledge and skills required to perform essential brew-house calculations and to evaluate efficiency in brewing operations. We shall commence this Series by examining grist weight and wort volume, focusing on how these fundamental calculations influence brewing outcomes. Next, we will explore extract yield and hop
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS rate, considering their impact on flavour balance and efficiency. Finally, we will wrap up by analysing time and energy utilisation, highlighting strategies for improving operational performance in the brew-house. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define grist weight and explain its role in determining wort volume, • SLO 1.2 calculate wort volume and relate it to brewing efficiency, • SLO 1.3 describe extract yield and analyse factors that influence its efficiency, • SLO 1.4 calculate hop rate and evaluate its impact on flavour balance, • SLO 1.5 examine brewing time management and apply strategies for effective scheduling, and • SLO 1.6 assess energy utilisation in brewing processes and propose methods for improving efficiency. 1.1 Grist Weight and Wort Volume 1.1.1 Definition and importance of grist weight The grist weight refers to the total mass of milled malt and adjuncts used in the brewing process. It is a critical parameter because it directly influences the amount of fermentable sugars available for yeast activity. Brewers must carefully measure grist weight to ensure consistency in flavour, alcohol content, and overall beer quality. A miscalculation at this stage can lead to variations in wort strength and brewing efficiency. Fill in the blank: The total mass of milled malt and adjuncts used in brewing is called __________.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Diagram showing malt grains being milled into grist. Figure 1.1: Milling of malt into grist 1.1.2 Calculating wort volume in brewing operations The wort volume is the total liquid extracted from the mash after lautering and sparging. It contains the sugars, proteins, and flavour compounds that will later be fermented by yeast. Calculating wort volume involves measuring the liquid collected and adjusting for losses during transfer, evaporation, and absorption by the grain bed. Accurate calculation ensures that the brewer achieves the desired batch size and target gravity. Fill in the blank: The liquid extracted from the mash that contains fermentable sugars is known as __________.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Table showing sample grist weight and corresponding wort volume yields. Table 1.1: Relationship between grist weight and wort volume 1.1.3 Relationship between grist composition and wort yield The composition of the grist, including the ratio of base malt to specialty malt and adjuncts, affects the wort yield, which is the amount of extract obtained per unit of grist. Base malts typically provide higher extract potential, while specialty malts contribute flavour and colour but may reduce yield. Brewers must balance these factors to achieve both efficiency and desired beer characteristics. Fill in the blank: The amount of extract obtained per unit of grist is referred to as __________. Box 1.1: Key factors influencing wort yield • Type of malt used • Milling quality • Mash temperature and duration • Sparging technique Pilot questions 1.1 1. What is meant by grist weight in brewing? 2. Why is accurate calculation of wort volume important? 3. Which type of malt generally provides higher extract potential?
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 4. What is wort yield, and how is it influenced by grist composition? 5. Name one factor apart from malt type that can affect wort yield. 1.2 Extract Yield and Hop Rate 1.2.1 Concept of extract yield and its measurement The extract yield refers to the amount of soluble material, mainly sugars, obtained from the grist during mashing. It is measured as a percentage of the theoretical maximum extract potential of the malt. High extract yield indicates efficient conversion of starches into fermentable sugars, which is essential for achieving the desired alcohol content and flavour profile. Brewers often use laboratory analysis or brewhouse calculations to determine extract yield. Fill in the blank: The percentage of soluble material obtained from the grist during mashing is called __________. Diagram showing starch conversion during mashing. Figure 1.2: Conversion of starches into fermentable sugars 1.2.2 Factors influencing extract efficiency Several factors influence extract efficiency, including mash temperature, mash duration, water-to-grist ratio, and milling quality. For example, a finely milled grist increases surface area for enzymatic activity, while an optimal mash temperature ensures enzymes such as amylase function effectively. Poor sparging techniques or excessive water loss can reduce extract efficiency. Fill in the blank: The enzyme responsible for breaking down starches into sugars during mashing is __________.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Box 1.2: Key factors affecting extract efficiency • Mash temperature and duration • Milling quality • Water-to-grist ratio • Sparging technique 1.2.3 Hop rate calculation and its impact on flavour balance The hop rate is the quantity of hops added to the wort, usually expressed in grams per litre or kilograms per hectolitre. Hops contribute bitterness, aroma, and flavour, balancing the sweetness of the malt. Calculating hop rate requires consideration of alpha acid content, boil time, and desired bitterness level measured in International Bitterness Units (IBU). A miscalculated hop rate can lead to beer that is either overly bitter or lacking balance. Fill in the blank: The bitterness of beer is commonly measured in __________. Table 1.2: Sample hop rates and corresponding IBU values Pilot questions 1.2 1. What does extract yield measure in brewing? 2. Name two factors that influence extract efficiency. 3. Why is milling quality important for extract yield?
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 4. Define hop rate and explain its role in flavour balance. 5. What unit is commonly used to measure beer bitterness? 1.3 Time and Energy Utilisation in Brewing 1.3.1 Brewing time management and process scheduling Brewing involves several stages, including mashing, lautering, boiling, cooling, and fermentation. Each stage requires careful time management, which refers to the planning and control of the duration of brewing activities. Efficient scheduling ensures that resources are used effectively, production targets are met, and beer quality remains consistent. Poor time management can lead to delays, wasted resources, and reduced efficiency. Fill in the blank: The planning and control of the duration of brewing activities is known as __________. Flowchart showing brewing stages with approximate time allocations. Figure 1.3: Brewing process scheduling 1.3.2 Energy requirements in mashing, boiling, and cooling Brewing is energy-intensive, with significant requirements during mashing, boiling, and cooling. Mashing requires heat to activate enzymes, boiling consumes large amounts of energy to sterilise wort and extract hop compounds, while cooling demands energy to rapidly reduce wort temperature before fermentation. Energy efficiency is vital for reducing costs and environmental impact.
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