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Encyclopedia > Brewing
A 16th century brewery
A 16th century brewery

Brewing is the production of alcoholic beverages and alcohol fuel through fermentation. This is the method used in beer production, although the term is also used to describe the fermentation process used to create wine, mead. It can also refer to the process of producing sake and soy sauce. The term is also sometimes used to refer to any chemical mixing process. Winemakers often use carboys like these to ferment smaller quantities of wine Winemaking, or vinification, is the process of wine production, from the selection of grapes to the bottling of finished wine. ... Steeping may mean: Soaking in liquid until saturated with a soluble ingredient, as in, for example, the steeping of tea. ... Image File history File links 16thCenturyBrewer. ... Image File history File links 16thCenturyBrewer. ... Booze redirects here. ... Gasoline on the left, alcohol on the right at a filling station in Brazil Rising energy prices and global warming have led to increased interest in alternative fuels. ... For other uses, see Fermentation. ... For other uses, see Beer (disambiguation). ... For other uses, see Wine (disambiguation). ... Mead Mead is a fermented alcoholic beverage made of honey, water, and yeast. ... Sake barrels at Itsukushima Shrine. ... Japanese name Kanji: Hiragana: Korean name Hangul: Vietnamese name Quoc Ngu: Soy sauce (US) or soya sauce is a fermented sauce made from soybeans (soya beans), roasted grain, water and salt. ...


Brewing has a very long history, and archeological evidence tells that this technique was used in ancient Egypt. Descriptions of various beer recipes can be found in Sumerian writings, some of the oldest known writing of any sort. Hathor The history of Egypt is the longest continuous history, as a unified state, of any country in the world. ... This article is about culinary recipes. ... Sumer ( Sumerian: KI-EN-GIR, Land of the Lords of Brightness[1], or land of the Sumerian tongue[2][3], Akkadian: Å umeru; possibly Biblical Shinar ), located in southern Mesopotamia, is the earliest known civilization in the world. ...


The brewing industry is part of most western economies. The beer brewing industry is dominated by a few international players. ...

Contents

Brewing beer

Brewing Real Ale
Hot Water Tank
Copper
Hopback
Fermenter
Cooler

All beers are brewed using a process based on a simple formula. Key to the process is malted grain--depending on the region, traditionally barley, wheat or sometimes rye. (When malting rye, due care must be taken to prevent ergot poisoning (ergotism), as rye is particularly prone to developing this toxic fungus during the malting process.) A mash tun is an insulated brewing vessel with a false bottom used in brewing. ... Malted barley Malting is a process applied to cereal grains, in which the grains are made to germinate and then are quickly dried before the plant develops. ... Hop umbel (branched floral structure resembling nested-inverted umbrellas) in a Hallertau hop yard Hops are a flower used primarily as a flavouring and stability agent in beer, as well as in herbal medicine. ... A bottling line consists of many pieces of machinery that puts a product into bottles on a large scale. ... Cask ales on racks Cask ale or cask-conditioned beer is the term for unfiltered and unpasteurised beer which is conditioned and served from a cask, usually without additional nitrogen or carbon dioxide pressure. ... Malted barley Malting is a process applied to cereal grains, in which the grains are made to germinate and then are quickly dried before the plant develops. ... Grain redirects here. ... For other uses, see Barley (disambiguation). ... Species T. aestivum T. boeoticum T. dicoccoides T. dicoccon T. durum T. monococcum T. spelta T. sphaerococcum T. timopheevii References:   ITIS 42236 2002-09-22 Wheat Wheat For the indie rock group, see Wheat (band). ... Binomial name Secale cereale M.Bieb. ... Species About 50, including: Claviceps africanum Claviceps fusiformis Claviceps paspali Claviceps purpurea Ergot is the common name of a fungus in the genus Claviceps that is parasitic on certain grains and grasses. ... Ergotism is the effect of long-term ergot poisoning, classically due to the ingestion of the alkaloids produced by the Claviceps purpurea fungus which infects rye and other cereals, and more recently by the action of a number of ergoline-based drugs. ...


Malt is made by allowing a grain to germinate, after which it is then dried in a kiln and sometimes roasted. The germination process creates a number of enzymes, notably α-amylase and β-amylase, which will be used to convert the starch in the grain into sugar. Depending on the amount of roasting, the malt will take on a dark colour and strongly influence the colour and flavour of the beer. Malted barley Malting is a process applied to cereal grains, in which the grains are made to germinate and then are quickly dried before the plant develops. ... Not to be confused with Gemination in phonetics. ... Charcoal Kilns, California Gold Kiln, Victoria, Australia Hop kiln. ... Neuraminidase ribbon diagram An enzyme (in Greek en = in and zyme = blend) is a protein, or protein complex, that catalyzes a chemical reaction and also controls the 3D orientation of the catalyzed substrates. ...


The malt is crushed to break apart the grain kernels, increase their surface area, and separate the smaller pieces from the husks. The resulting grist is mixed with heated water in a vat called a "mash tun" for a process known as "mashing". During this process, natural enzymes within the malt break down much of the starch into sugars which play a vital part in the fermentation process. Mashing usually takes 1 to 2 hours, and during this time various temperature rests (waiting periods) activate different enzymes depending upon the type of malt being used, its modification level, and the desires of the brewmaster. The activity of these enzymes convert the starches of the grains to dextrins and then to fermentable sugars such as maltose. The mash tun generally contains a slotted "false bottom" or other form of manifold which acts as a strainer allowing for the separation of the liquid from the grain. Grist Magazine, Environmental News & Commentary (est. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... vat can be a type of barrel used for storage. ... Mashing is a stage in the brewing process where grains are steeped in water at specific temperatures, to facilitate enzyme activity and starch conversion. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ... Starch (CAS# 9005-25-8, chemical formula (C6H10O5)n,[1]) is a mixture of amylose and amylopectin (usually in 20:80 or 30:70 ratios). ... This article is about sugar as food and as an important and widely-traded commodity. ... For other uses, see Temperature (disambiguation). ... A person who is in charge of the production of beer. ... Dextrins are a group of low-molecular-weight carbohydrates produced by the hydrolysis of starch. ... Maltose, or malt sugar, is a disaccharide formed from two units of glucose joined with an α(1→4) linkage. ...


A mash rest from 49-55°C (120-130°F) activates various proteinases, which break down proteins that might otherwise cause the beer to be hazy. But care is of the essence since the head on beer is also composed primarily of proteins, so too aggressive a protein rest can result in a beer that cannot hold a head. This rest is generally used only with undermodified (i.e. undermalted) malts which are decreasingly popular in Germany and the Czech Republic, or non-malted grains such as corn and rice, which are widely used in North American beers. A mash rest at 60°C (140°F) activates beta-glucanase, which breaks down gummy beta-glucans in the mash, making the sugars flow out more freely later in the process. In the modern mashing process commercial fungal based beta-glucanase may be added as a supplement. Finally, a mash rest temperature of 65-71°C (149-160°F) is used to convert the starches in the malt to sugar, which is then usable by the yeast later in the brewing process. Doing the latter rest at the lower end of the range produces more low-order sugars which are more fermentable by the yeast. This in turn creates a beer lower in body and higher in alcohol. A rest closer to the higher end of the range creates more higher-order sugars which are less fermentable by the yeast, so a fuller-bodied beer with less alcohol is the result. Peptidases (proteases [pronounced pro-tea-aces] and proteolytic enzymes are also commonly used) are enzymes which break peptide bonds of proteins. ... This article is about the maize plant. ... For other uses, see Rice (disambiguation). ... Typical divisions Ascomycota (sac fungi) Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota (club fungi) Urediniomycetes Sporidiales Yeasts are a growth form of eukaryotic micro organisms classified in the kingdom Fungi, with about 1,500 species described;[1] they dominate fungal diversity in the oceans. ... Grain alcohol redirects here. ...


After the mashing, the resulting liquid is strained from the grains in a process known as lautering. Prior to lautering, the mash temperature may be raised to about 75 °C (165-170 °F) (known as a mashout) to deactivate enzymes. Additional water may be sprinkled on the grains to extract additional sugars (a process known as sparging). For other uses, see Liquid (disambiguation). ... Lautering is a process in brewing beer in which the mash is separated into the clear liquid wort and the residual grain. ... Sparging in chemical sciences refers to the bubbling of a chemically inert gas through a liquid. ...


At this point the liquid is known as wort. The wort is moved into a large tank known as a "copper" or kettle where it is boiled with hops and sometimes other ingredients such as herbs or sugars. The boiling process serves to terminate enzymatic processes, precipitate proteins, isomerize hop resins, concentrate and sterilize the wort. Hops add flavour, aroma and bitterness to the beer. At the end of the boil, the hopped wort settles to clarify it in a vessel called a "whirl-pool" and the clarified wort is then cooled. Wort (IPA ) is the liquid extracted from the mashing process during the brewing of beer or whisky. ... A kettle is a kitchenware piece. ... Hop umbel (branched floral structure resembling nested-inverted umbrellas) in a Hallertau hop yard Hops are a flower used primarily as a flavouring and stability agent in beer, as well as in herbal medicine. ... This article is about the plants used in cooking and medicine. ... In chemistry, isomerization is the transformation of a molecule into a different isomer. ... This article does not cite any references or sources. ... Sterilization (or sterilisation) refers to any process that effectively kills or eliminates transmissible agents (such as fungi, bacteria, viruses and prions) from a surface, equipment, foods, medications, or biological culture medium. ... Aroma redirects here. ... Human taste sensory organs, called taste buds or gustatory calyculi, and concentrated on the upper surface of the tongue, appear to be receptive to relatively few chemical species as tastes. ...


The wort is then moved into a "fermentation vessel" where yeast is added or "pitched" with it. The yeast converts the sugars from the malt into alcohol, carbon dioxide and other components through a process called Glycolysis. After a week to three weeks, the fresh (or "green") beer is run off into conditioning tanks. After conditioning for a week to several months, the beer is often filtered to remove yeast and particulates. The "bright beer" is then ready for serving or packaging. Typical divisions Ascomycota (sac fungi) Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota (club fungi) Urediniomycetes Sporidiales Yeasts are a growth form of eukaryotic micro organisms classified in the kingdom Fungi, with about 1,500 species described;[1] they dominate fungal diversity in the oceans. ... Carbon dioxide (chemical formula: ) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ... Glycolysis is the sequence of reactions that converts glucose into pyruvate with the concomitant production of a relatively small amount of ATP. The word is derived from Greek γλυκύς (sweet) and λύσις (letting loose). ...


There are four main families of beer styles determined by the variety of yeast used in their brewing. Michael Jacksons Guide Beer style is a term used to differentiate and categorise beers by various factors such as colour, strength, ingredients, production method or origin. ...

Main article: Beer styles

Michael Jacksons Guide Beer style is a term used to differentiate and categorise beers by various factors such as colour, strength, ingredients, production method or origin. ...

Ale (top-fermenting yeasts)

Main article: Ale

Ale yeasts ferment at warmer temperatures between 15-20°C (60-68°F), and occasionally as high as 24°C (75°F). Pure ale yeasts form a foam on the surface of the fermenting beer, because of this they are often referred to as top-fermenting yeast—though there are some British ale yeast strains that settle at the bottom. Ales are generally ready to drink within three weeks after the beginning of fermentation, however, some styles benefit from additional aging for several months or years. Ales range in colour from very pale to black opaque. England is best known for its variety of ales. Ale yeasts can be harvested from the primary fermenter, and stored in the refrigerator. For other uses, see Ale (disambiguation). ... For other uses, see Ale (disambiguation). ...


Lager (bottom-fermenting yeasts)

Main article: Lager

While the nature of yeast was not fully understood until Emil Hansen of the Carlsberg brewery in Denmark isolated a single yeast cell in the 1800s, brewers in Bavaria had for centuries been selecting these cold-fermenting lager yeasts by storing (lagern) their beers in cold alpine caves. The process of natural selection meant that the wild yeasts that were most cold tolerant would be the ones that would remain actively fermenting in the beer that was stored in the caves. Some of these Bavarian yeasts were stolen and brought back to the Carlsberg brewery around the time that Hansen did his famous work. Lager is a well attenuated beer brewed in cool conditions using a slow-acting brewers yeast, known as a bottom-fermenting yeast, and then stored (or lagered) for a period in cool conditions to clear away particles and certain flavour compounds to produce a clean taste. ... Emil Christian Hansen (May 8, 1842 - August 27, 1909) was a Danish fermentation physiologist. ... Carlsberg A/S headquartered in Valby, Denmark, with its operating company, Carlsberg Breweries A/S, headquartered in Copenhagen produce Carlsberg Beer. ... For other uses, see Bavaria (disambiguation). ... For other uses, see Cave (disambiguation). ...


Lager yeast tends to collect at the bottom of the fermenter and is often referred to as bottom-fermenting yeast. Lager is fermented at much lower temperatures, around 10°C (50°F), compared to typical ale fermentation temperatures of 18°C (65°F). It is then stored for 30 days or longer close to freezing point. During storage, the beer mellows and flavours become smoother. Sulfur components developed during fermentation dissipate. The popularity of lager was a major factor that led to the rapid introduction of refrigeration in the early 1900s. In physics and chemistry, freezing is the process whereby a liquid turns to a solid when cold enough. ... This article is about the chemical element. ... Refrigeration is the process of removing heat from an enclosed space, or from a substance, and rejecting it elsewhere for the primary purpose of lowering the temperature of the enclosed space or substance and then maintaining that lower temperature. ...


Today, lagers represent the vast majority of beers produced, the most famous being a light lager called Pilsner which originated in Pilsen, Czech Republic (Plzeň in Czech). It is a common misconception that all lagers are light in color—lagers can range from very light to deep black, just like ales. Pilsener or pilsner is a type of lager beer. ... Plzeň (Czech name) or Pilsen (German equivalent, sometimes used in English) is a city in western Bohemia in the Czech Republic. ...


Beers of Spontaneous Fermentation (wild yeasts)

Main article: Lambic

These beers are nowadays primarily only brewed around Brussels, Belgium. They are fermented by means of wild yeast strains that live in a part of the Zenne river which flows through Brussels. These beers are also called Lambic beers. However with the advent of yeast banks and the National Collection of Yeast Cultures,[1] brewing these beers, although not through spontaneous fermentation, is possible anywhere. Traditional wooden Lambic barrels; the L on the barrel indicates the brewery. ... Traditional wooden Lambic barrels; the L on the barrel indicates the brewery. ...


Beers of mixed origin

These beers are blends of spontaneous fermentation beers and ales or lagers or they are ales/lagers which are also fermented by wild yeasts.


The brewing process

Work in the brewery is typically divided into 7 steps: mashing, lautering, boiling, fermenting, conditioning, filtering, and filling. Mashing is a stage in the brewing process where grains are steeped in water at specific temperatures, to facilitate enzyme activity and starch conversion. ... Lautering is a process in brewing beer in which the mash is separated into the clear liquid wort and the residual grain. ... For other uses, see Fermentation. ...


HERMS is an acronym for a type of brewing system, particularly in homebrewing, which stands for Heat Exchange Recirculating Mash System. The basic premise is that liquid wort is drawn off from the mash and passed through a heat exchanger before returning to the mash. It is widely (although not universally) accepted that this process speeds starch conversion, clarifies runoff and greatly reduces temperature stratification within the mash. It has been suggested that this article or section be merged with Backronym and Apronym (Discuss) Acronyms and initialisms are abbreviations, such as NATO, laser, and ABC, written as the initial letter or letters of words, and pronounced on the basis of this abbreviated written form. ... For other meanings, see Homebrew. ... Wort (IPA ) is the liquid extracted from the mashing process during the brewing of beer or whisky. ... A heat exchanger is a device built for efficient heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix, or the fluids are directly contacted. ... Starch conversion is the process (especially in brewing) whereby unfermentable starch is converted into fermentable sugars, either by malting or mashing. ...


Mashing

Main article: Mashing

Mashing is the process of mixing milled grain (typically malted grain) with water, and heating this mixture up with rests at certain temperatures to allow enzymes in the malt to break down the starch in the grain into sugars, typically maltose. Mashing is a stage in the brewing process where grains are steeped in water at specific temperatures, to facilitate enzyme activity and starch conversion. ... Malted barley Malting is a process applied to cereal grains, in which the grains are made to germinate and then are quickly dried before the plant develops. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ... Starch (CAS# 9005-25-8, chemical formula (C6H10O5)n,[1]) is a mixture of amylose and amylopectin (usually in 20:80 or 30:70 ratios). ... This article is about sugar as food and as an important and widely-traded commodity. ... Maltose, or malt sugar, is a disaccharide formed from two units of glucose joined with an α(1→4) linkage. ...

Boilers at the Samuel Adams brewery
Boilers at the Samuel Adams brewery

Image File history File links Download high resolution version (1656x1108, 204 KB) Summary Boilers at the Samuel Adams brewery in Boston, Massachusetts. ... Image File history File links Download high resolution version (1656x1108, 204 KB) Summary Boilers at the Samuel Adams brewery in Boston, Massachusetts. ... Samuel Adams is the brand name of American beers produced by the Boston Beer Company (NYSE: SAM) and named after Samuel Adams, a brewer[1] and patriot. ...

Lautering

Main article: Lautering

Lautering is the separation of the extracts wort during mashing from the spent grain. It is achieved in either a lauter tun, a wide vessel with a false bottom, or a mash filter, a plate-and-frame filter designed for this kind of separation. Lautering has two stages: first wort run-off, during which the extract is separated in an undiluted state from the spent grains, and sparging, in which extract which remains with the grains is rinsed off with hot water. Lautering is a process in brewing beer in which the mash is separated into the clear liquid wort and the residual grain. ... A Lauter Tun is a special container used in all-grain brewing for separating the sweet wort from the spent grains (malted barley etc. ...


Lauter tun

Main article: Lauter tun

A lauter tun is a special container used in all-grain brewing for separating the sweet wort from the spent grains (malted barley etc.). In essence it is simply a large strainer. It can be as simple as a plastic bucket with holes in the bottom or as complex as a stainless steel kettle with a specialized straining device attached to a spigot welded into the side of the kettle. A Lauter Tun is a special container used in all-grain brewing for separating the sweet wort from the spent grains (malted barley etc. ... Wort (IPA ) is the liquid extracted from the mashing process during the brewing of beer or whisky. ...


Sparging is the rinsing of the grains with water and is most often conducted in a lauter tun. Lautering is a process in brewing beer in which the mash is separated into the clear liquid wort and the residual grain. ...


Mash filter

A mash filter is a plate-and-frame filter. The empty frames contain the mash, including the spent grains, and have a capacity of around one hectoliter. The plates contain a support structure for the filter cloth. The plates, frames, and filter cloths are arranged in a carrier frame like so: frame, cloth, plate, cloth, with plates at each end of the structure. Newer mash filters have bladders that can press the liquid out of the grains between spargings. The grain does not act like a filtration medium in a mash filter. A hectolitre (hL or hl) is volume measure and a metric unit equal to 100 litres, or 10−1 m3. ...


Boiling

Boiling the malt extracts, called wort, ensures its sterility, and thus prevents a lot of infections. During the boil hops are added, which contribute bitterness, flavour, and aroma compounds to the beer, and, along with the heat of the boil, causes proteins in the wort to coagulate and the pH of the wort to fall. Finally, the vapours produced during the boil volatilise off flavours, including dimethyl sulfide precursors. For other uses, see PH (disambiguation). ... Dimethyl sulfide causes that distinctive smell from your St. ...


The boil must be conducted so that is it even and intense. The boil lasts between 50 and 120 minutes, depending on its intensity, the hop addition schedule, and volume of wort the brewer expects to evaporate.


Boiling equipment

Brew kettles at Coors Brewing Company.
Brew kettles at Coors Brewing Company.

The simplest boil kettles are direct-fired, with a burner underneath. These can produce a vigorous and favourable boil, but are also apt to scorch the wort where the flame touches the kettle, causing caramelization and making clean up difficult. The Coors Brewing Company is a regional division of the world’s fifth-largest brewery companies, the Molson Coors Brewing Company. ...


Most breweries use a steam-fired kettle, which uses steam jackets in the kettle to boil the wort. The steam is delivered under pressure by an external boiler.


State-of-the-art breweries today use many interesting boiling methods, all of which achieve a more intense boiling and a more complete realisation of the goals of boiling.


Many breweries have a boiling unit outside of the kettle, sometimes called a calandria, through which wort is pumped. The unit is usually a tall, thin cylinder, with many tubes upwards through it. These tubes provide an enormous surface area on which vapor bubbles can nucleate, and thus provides for excellent volitization. The total volume of wort is circulated seven to twelve times an hour through this external boiler, ensuring that the wort is evenly boiled by the end of the boil. The wort is then boiled in the kettle at atmospheric pressure, and through careful control the inlets and outlets on the external boiler, an overpressure can be achieved in the external boiler, raising the boiling point by a few Celsius degrees. Upon return to the boil kettle, a vigorous vaporization occurs. The higher temperature due to increased vaporization can reduce boil times up to 30%. External boilers were originally designed to improve performance of kettles which did not provide adequate boiling effect, but have since been adopted by the industry as a sole means of boiling wort. Atmospheric pressure is the pressure at any given point in the Earths atmosphere. ...


Modern brewhouses can also be equipped with internal calandria, which requires no pump. It works on basically the same principle as external units, but relies on convection to move wort through the boiler. This can prevent overboiling, as a deflector above the boiler reduces foaming, and also reduces evaporation. Internal calandria are generally difficult to clean.


Energy recovery

Boiling wort takes a lot of energy, and it is wasteful to let this energy escape into the atmosphere. The simplest way to recover this energy is with a kettle vapor condenser (German: Pfaduko, from the much longer Pfannendunstkondensator). A kettle vapor condenser is often nothing more than a plate heat exchanger.


Whirlpooling

At the end of the boil, the wort is set into a whirlpool. The so-called teacup effect forces the more dense solids (coagulated proteins, vegetable matter from hops) into a cone in the center of the whirlpool tank.


In most large breweries, there is a separate tank for whirlpooling. These tanks have a large diameter to encourage settling, a flat bottom, a tangential inlet near the bottom of the whirlpool, and an outlet on the bottom near the outer edge of the whirlpool. A whirlpool should have no internal protrusions that might slow down the rotation of the liquid. The bottom of the whirlpool is often slightly sloped towards the outlet. Newer whirlpools often have "Denk rings" suspended in the middle of the whirlpool. These rings are aligned horizontally and have about 75% of the diameter of the whirlpool. The Denk rings prevent the formation of secondary eddies in the whirlpool, encouraging the formation of a cohesive trub cone in the middle of the whirlpool. Smaller breweries often use the brewkettle as a whirlpool. In the United Kingdom, it is common practice to use a device known as a hopback to clear the green wort (green wort is wort to which yeast has not yet been added). This device has the same effect as, but operates in a completely different manner than, a whirlpool. The two devices are often confused but are in function, quite different. While a whirlpool functions through the use of centrifugal forces, a hopback uses a layer of fresh hop flowers in a confined space to act as a filter bed to remove trub (pronounced tr-oo-b, tr-uh-b in the UK). Furthermore, while a whirlpool is only useful for the removal of pelleted hops (as flowers don't tend to separate as easily), hopbacks are generally used only for the removal of whole flower hops (as the particles left by pellets tend to make it through the hopback.)


In homebrewing, where a brewer has the power to lift the entire stock and manipulate it by hand; the process of trub removal (the process addressed by the whirlpool and hopback) is generally accomplished by simply allowing the trub to settle to the bottom of the brew kettle and slowly decanting the green wort from the top so as not to disturb the thin layer of trub. Siphoning may also be employed but this is rare.


Wort cooling

After the whirlpool, the wort must be brought down to fermentation temperatures before yeast is added. In modern breweries this is achieved through a plate heat exchanger. A plate heat exchanger has many ridged plates, which form two separate paths. The wort is pumped into the heat exchanger, and goes through every other gap between the plates. The cooling medium, usually water, goes through the other gaps. The ridges in the plates ensure turbulent flow. A good heat exchanger can drop 95 °C wort to 20 °C while warming the cooling medium from about 10 °C to 80 °C. The last few plates often use a cooling medium which can be cooled to below the freezing point, which allows a finer control over the wort-out temperature, and also enables cooling to around 10 °C. After cooling, oxygen is often dissolved into the wort to revitalize the yeast and aid its reproduction. A heat exchanger is a device built for efficient heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix, or the fluids are directly contacted. ... Freezing point can refer to several things: For the chemistry term, see Melting point. ...


Fermenting

Modern fermenting tanks
Modern fermenting tanks

Fermentation, as a step in the brewing process, starts as soon as yeast is added to the cooled wort. This is also the point at which the product is first called beer. It is during this stage that sugars won from the malt are metabolized into alcohol and carbon dioxide. Fermentation tanks come in all sorts of forms, from enormous tanks which can look like storage silos, to five gallon glass carboys in a homebrewer's closet. Image File history File links Download high resolution version (1752x1168, 293 KB) Summary Modern fermenting tanks. ... Image File history File links Download high resolution version (1752x1168, 293 KB) Summary Modern fermenting tanks. ... Malted barley Malting is a process applied to cereal grains, in which the grains are made to germinate and then are quickly dried before the plant develops. ... Grain alcohol redirects here. ... Carbon dioxide (chemical formula: ) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ... Bold text This article is about Storage Silos. ... The gallon (abbreviation: gal) is a unit of volume. ... A carboy is a glass vessel used in fermenting wine, mead and sometimes beer. ...


Most breweries today use cylindroconical vessels, or CCVs, have a conical bottom and a cylindrical top. The cone's aperture is typically around 60°, an angle that will allow the yeast to flow towards the cones apex, but is not so steep as to take up too much vertical space. CCVs can handle both fermenting and conditioning in the same tank. At the end of fermentation, the yeast and other solids which have fallen to the cones apex can be simply flushed out a port at the apex. a big (1) and a small (2) aperture For other uses, see Aperture (disambiguation). ...

Krauesen in an English brewery's fermentation tank
Krauesen in an English brewery's fermentation tank

Open fermentation vessels are also used, often for show in brewpubs, and in Europe in wheat beer fermentation. These vessels have no tops, which makes harvesting top fermenting yeasts very easy. The open tops of the vessels make the risk of infection greater, but with proper cleaning procedures and careful protocol about who enters fermentation chambers when, the risk can be well controlled. Image File history File linksMetadata Download high-resolution version (1280x960, 278 KB) Inside a fermenting tank. ... Image File history File linksMetadata Download high-resolution version (1280x960, 278 KB) Inside a fermenting tank. ...


Fermentation tanks are typically made of stainless steel. If they are simple cylindrical tanks with beveled ends, they are arranged vertically, as opposed to conditioning tanks which are usually laid out horizontally. Only a very few breweries still use wooden vats for fermentation as wood is difficult to keep clean and infection-free and must be repitched more or less yearly.


After high kraeusen a bung device (German: Spundapparat) is often put on the tanks to allow the CO2 produced by the yeast to naturally carbonate the beer. This bung device can be set to a given pressure to match the type of beer being produced. The more pressure the bung holds back, the more carbonated the beer becomes. For other uses, see Carbon (disambiguation). ... This article is about the chemical element and its most stable form, or dioxygen. ... Carbon dioxide (chemical formula: ) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ...


Conditioning

When the sugars in the fermenting beer have been almost completely digested, the fermentation slows down and the yeast starts to settle to the bottom of the tank. At this stage, the beer is cooled to around freezing, which encourages settling of the yeast, and causes proteins to coagulate and settle out with the yeast. Unpleasant flavors such as phenolic compounds become insoluble in the cold beer, and the beer's flavor becomes smoother. During this time pressure is maintained on the tanks to prevent the beer from going flat.


Often, the beer is then racked (siphoned) into another container, usually a carboy, for aging or secondary fermentation. Fermentation is virtually complete, so the term secondary fermentation actually refers to conditioning. Use of a hydrometer is recommended to be absolutely sure all fermentation is finished; this is especially important as a precaution when the beer is to be bottled. Racking is done to separate the beer from the trub so that the remaining active yeasts do not consume it, as this can give the beer an off-flavor. Racking also helps separate the beer from sediment, making it less likely to find its way into the finished product. During secondary fermentation some chemical byproducts from the primary fermentation are digested, which considerably improves the taste. Secondary fermentation can take from 2 to 4 weeks, sometimes longer, depending on the type of beer. Additionally lagers, at this point, are aged at near freezing temperatures for 1-6 months depending on style. This cold aging serves to reduce sulfur compounds produced by the bottom-fermenting yeast and to produce a cleaner tasting final product with fewer esters. Not to be confused with Psiphon. ... A carboy is a glass vessel used in fermenting wine, mead and sometimes beer. ... A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. ... Lager beers are alcoholic beverages of German and Czech origin, taking their name from the German lagern (to store). Lagers are brewed principally from malted barley (without cane sugar, an adjunct), hops and water at low temperatures (usually between 5°C and 15°C) that cause bottom-fermentation. ... This article is about the chemical element. ... For the Biblical Ester, see Esther. ...


If the fermentation tanks have cooling jackets on them, as opposed to the whole fermentation cellar being cooled, conditioning can take place in the same tank as fermentation. Otherwise separate tanks (in a separate cellar) must be employed. This is where aging occurs.


Filtering

A mixture of diatomaceous earth and yeast after filtering.
A mixture of diatomaceous earth and yeast after filtering.
Main article: Filtered beer

Filtering the beer stabilizes the flavour, and gives beer its polished shine and brilliance. Not all beer is filtered. When tax determination is required by local laws, it is typically done at this stage in a calibrated tank. Image File history File linksMetadata Download high resolution version (2048x1536, 508 KB) Summary A mixture of diatomaceous earth and yeast. ... Image File history File linksMetadata Download high resolution version (2048x1536, 508 KB) Summary A mixture of diatomaceous earth and yeast. ... A sample of diatomaceous earth Diatomaceous earth (IPA: , also known as DE, diatomite, diahydro, kieselguhr, kieselgur and Celite) is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder. ... Typical divisions Ascomycota (sac fungi) Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota (club fungi) Urediniomycetes Sporidiales Yeasts are a growth form of eukaryotic micro organisms classified in the kingdom Fungi, with about 1,500 species described;[1] they dominate fungal diversity in the oceans. ... Typical filtered beer Filtered beer is beer which has been cleaned of significant contact with yeast. ...


Filters come in many types. Many use pre-made filtration media such as sheets or candles, while others use a fine powder made of, for example, diatomaceous earth, also called kieselguhr, which is introduced into the beer and recirculated past screens to form a filtration bed. A sample of diatomaceous earth Diatomaceous earth (IPA: , also known as DE, diatomite, diahydro, kieselguhr, kieselgur and Celite) is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder. ...


Filters range from rough filters that remove much of the yeast and any solids (e.g. hops, grain particles) left in the beer, to filters tight enough to strain color and body from the beer. Normally used filtration ratings are divided into rough, fine and sterile. Rough filtration leaves some cloudiness in the beer, but it is noticeably clearer than unfiltered beer. Fine filtration gives a glass of beer that you could read a newspaper through, with no noticeable cloudiness. Finally, as its name implies, sterile filtration is fine enough that almost all microorganisms in the beer are removed during the filtration process.


Sheet (pad) filters

These filters use pre-made media and are relatively straightforward. The sheets are manufactured to allow only particles smaller than a given size through, and the brewer is free to choose how finely to filter the beer. The sheets are placed into the filtering frame, sterilized (with hot water, for example) and then used to filter the beer. The sheets can be flushed if the filter becomes blocked, and usually the sheets are disposable and are replaced between filtration sessions. Often the sheets contain powdered filtration media to aid in filtration.


It should be kept in mind that pre-made filters have two sides. One with loose holes, and the other with tight holes. Flow goes from the side with loose holes to the side with the tight holes, with the intent that large particles get stuck in the large holes while leaving enough room around the particles and filter medium for smaller particles to go through and get stuck in tighter holes.


Sheets are sold in nominal ratings, and typically 90% of particles larger than the nominal rating are caught by the sheet.


Kieselguhr filters

Filters that use a powder medium are considerably more complicated to operate, but can filter much more beer before needing to be regenerated. Common media include diatomaceous earth, or kieselguhr, and perlite. A sample of diatomaceous earth Diatomaceous earth (IPA: , also known as DE, diatomite, diahydro, kieselguhr, kieselgur and Celite) is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder. ... Expanded Perlite Perlite is an amorphous volcanic glass that has a relatively high water content. ...


Packaging

Packaging is putting the beer into the containers in which it will leave the brewery. Typically this means in bottles, aluminium cans and kegs, but it might include bulk tanks for high-volume customers. This article does not cite any references or sources. ...


Secondary fermentation

Secondary fermentation is an additional fermentation after the first or primary fermentation. For the secondary fermentation, the beer is transferred to a second fermenter, so that it is no longer exposed to the dead yeast and other debris (also known as "trub") that have settled to the bottom of the primary fermenter. This prevents the formation of unwanted flavors and harmful compounds such as acetylaldehydes, which are commonly blamed for hangovers. In brewing and wine-making, secondary fermentation is the fermentation some beers and sparkling wines undergo in their final containers, giving natural carbonation. ... R-phrases , , S-phrases , , , Flash point −39 °C Autoignition temperature 185 °C RTECS number AB1925000 Supplementary data page Structure and properties n, εr, etc. ...


Among homebrewers, secondary fermentation is a common source of discussion and debate. Some believe that the majority of homebrewed beers can simply be fermented in a single fermenter for approximately two weeks and then bottled, making secondary fermentation unnecessary. However, secondary fermentation is a necessary step when brewing beers with long fermentation times, such as lagers. Many homebrewers use secondary fermentation as a way of Conditioning, to enhance both the flavor and appearance of the beer.[1] For other meanings, see Homebrew. ...


During secondary fermentation, most of the remaining yeast will settle to the bottom of the second fermenter, yielding a less hazy product. Some beers may have three fermentations, the third being the bottle fermentation.


Bottle fermentation

See Bottle conditioning.

Most homebrewed beers undergo a fermentation in the bottle, giving natural carbonation. This may be a second or third fermentation. They are bottled with a viable yeast population in suspension. If there is no residual fermentable sugar left, sugar may be added. The resulting fermentation generates CO2 which is trapped in the bottle, remaining in solution and providing natural carbonation. Bottle conditioning is the process by which an alcoholic drink, typically beer, is wholly or partially fermented in the bottle from which it is served. ... Typical divisions Ascomycota (sac fungi) Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota (club fungi) Urediniomycetes Sporidiales Yeasts are a growth form of eukaryotic micro organisms classified in the kingdom Fungi, with about 1,500 species described;[1] they dominate fungal diversity in the oceans. ... Carbon dioxide (chemical formula: ) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. ...


Cask conditioning

See Cask ale.

Beer in casks are managed carefully to allow some of the carbonation to escape. Cask ales on racks Cask ale or cask-conditioned beer is the term for unfiltered and unpasteurised beer which is conditioned and served from a cask, usually without additional nitrogen or carbon dioxide pressure. ...


See also

Wikibooks
Wikibooks has a book on the topic of
Brewing

Image File history File links Wikibooks-logo-en. ... Wikibooks logo Wikibooks, previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks, is a wiki for the creation of books. ... Distillation is a means of separating liquids through differences in their boiling points. ... Kettles in a modern Trappist brewery A brewery can be a building or place that produces beer, or a business (brewing company) whose trade is the production and sale of beer. ... For other meanings, see Homebrew. ... Alulu Tablet - a receipt for best beer from 2050 BC in the ancient Kingdom of Ur Beer is one of the oldest beverages humans have produced, dating back to at least the 5th millennium BC and recorded in the written history of Ancient Egypt and Mesopotamia. ... Mead Mead is a fermented alcoholic beverage made of honey, water, and yeast. ...

References

  1. ^ National Collection of Yeast Cultures
Wikisource has the text of the 1911 Encyclopædia Britannica article Brewing.

Image File history File links Wikisource-logo. ... The original Wikisource logo. ... Encyclopædia Britannica, the eleventh edition The Encyclopædia Britannica Eleventh Edition (1910–1911) is perhaps the most famous edition of the Encyclopædia Britannica. ...

External links

Look up brewing in Wiktionary, the free dictionary.
Wikimedia Commons has media related to:
Beer-brewing
  • Home brewing
  • Brewery History Society promotes research in the brewing industry, and collects information about brewery history.
  • The River Wey and Wey Navigations Community Site — a site about the Wey Valley including information about the history of Brewing in southern England
  • The British Library - finding information about the brewing industry
  • interactive Flowsheets on beer brewing
  • An overview of the microbiology behind beer brewing from the Science Creative Quarterly
  • Brewing news page - Alcohol and Drugs History Society
  • Carling Brewing Process
  • Hyfoma on beer brewing - Hyfoma
  • The Brewers' Handbook The Complete Book to Brewing Beer.
  • Cat's Meow Collection Internet recipes compiled as of 1997
Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 151 languages. ... The Alcohol and Drugs History Society is a scholarly organization whose members study the history of a variety of illegal, regulated, and unregulated drugs such as opium, alcohol, and coffee. ...

  Results from FactBites:
 
Brewing - Wikipedia, the free encyclopedia (5496 words)
Brewing has a very long history, and archeological evidence tells us that this technique was used in ancient Egypt.
There is some contention in the brewing industry as to just what the optimal temperature is for these enzymes, as it is often very dependent on the pH of the mash, and its thickness.
The word zymurgy is sometimes used as a generic term for brewing, winemaking and distilling.
  More results at FactBites »

 
 

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