Dear Mr. Wizard,
Recently, I have read references to "whirlpooling" to help separate the trub from the wort. Can you elaborate on how this is done? My brew kettle is a keg with the top cut off and a drain tube welded in the side about an inch from the bottom.
Mr. Wizard replies:
Whirlpooling is a common method used in commercial breweries to separate hop pellets and trub from wort after the wort boil. Essentially the wort is pumped into the whirlpool vessel at rapid velocity, usually about 15 feet per second, to cause the wort to start spinning like a whirlpool. Sometimes the kettle doubles as the whirlpool vessel and the wort is recirculated to the kettle.
In commercial breweries this pumping process lasts for 10 to 20 minutes. Then the wort is allowed to stand for an additional 20 minutes or so to allow the hops and trub to form a compact trub/hop pile in the center of the vessel. The wort is easily separated from the pile by pumping it out of an outlet located on the side of the vessel. Although whirlpooling was originally developed to separate pelletized hops from wort, breweries that use whole hops, such as Anheuser-Busch, use whirlpools to remove trub after their whole hops have been strained from the wort.
Homebrewers can use whirlpools just like the big guys. Instead of pumping the wort after boiling, use a big spoon to stir persistently in a circular motion in one direction. This will generate a mini-whirlpool. Stir the wort at a good clip for one to two minutes and allow it to rest for 10 to 20 minutes before draining the wort into your wort cooler. Watch as the wort level gets low. If you really want to separate as much hops and trub as possible, stop the flow when the trub pile starts to suck into your wort chiller.
The whirlpool is a simple device, but there are many variations on its basic design used in commercial breweries. The most common design is a flat-bottomed vessel with a slight pitch toward the drain. This gives a great trub pile but also allows the trub to slide toward the outlet if the pile is loose. Some designs have a low point in the center and an outlet drain that is a little higher than the low point. This prevents trub from leaving with the wort. Your keg/kettle will behave like this system.
Whirlpool trivia: Some tea drinkers who use loose tea and no tea ball separate the tea leaves by stirring their tea after the leaves sink to the bottom of the cup to cause the leaves to migrate to the center of the cup. Albert Einstein thought this phenomenon was pretty nifty. He developed a general explanation, called the Teacup Effect, of why pressure changes cause solids to migrate to the center instead of to the perimeter, where it seems like they should migrate. Molson Breweries in Canada is credited with first using the whirlpool in commercial brewing.
Dear Mr. Wizard,
I am basically a beginner and still use sugar in my wort. The batch usually has a slight "wine" taste. An experienced friend suggested that I try honey in place of sugar. I use four cups of sugar. What is the equivalent when I use honey?
Mr. Wizard replies:
Cane sugar is well known to give beer a cidery or winey flavor. If you want to get rid of this flavor, using honey in place of sugar is one of several solutions. When substituting brewing ingredients in recipes it is much easier to base your conversion on weight, not on volumetric measurements such as cups, because ingredient densities, especially those of malt, vary quite a bit. To substitute honey for sugar, you should use about 1.25 pounds of honey for every pound of sugar in the original recipe. This conversion is approximate because the solids content of honey has a large range, but most honeys are around 80 percent solids.
According to the label on a commercial brand of honey, three-quarters cup of sugar is equivalent to one cup of honey. This honey has a solids content of 81 percent. Consider substituting malt for sugar if you want to make beer that tastes like beer. Although honey will take care of the odd flavors associated with cane sugar, honey beers have their own distinct flavor notes that make them taste different than all-malt beers. You can substitute dry malt extract for cane sugar on a pound-for-pound basis and can substitute malt extract for cane sugar at the rate of 1.25 pounds malt extract per pound of sugar. If you want to brew a beer with a lighter flavor but don’t want a honey beer, try using rice syrup. Rice is used in many commercial beers, including Budweiser and Coors, and has its own special flavor contribution.
The thing to remember when brewing beer is that you can use different techniques and buy all types of fancy gizmos to improve the brewing process, but at the end of the day, beer flavor is a product of the starting ingredients. Be an explorer and try out as many different brewing ingredients as you can. Cane sugar, brown sugar, candi sugar, pineapple sugar, corn syrup, rice, wheat, barley, oats, rye, potatoes — the list goes on for the variety of carbohydrate sources used in brewing. Add to the list the variety of flavors found in different hop varieties, yeast strains, brewing spices, and water. You will discover through exploration that ingredients hold the keys to flavor!
Mr. Wizard, BYO's resident expert, is a leading authority in homebrewing whose identity, like the identity of all superheroes, must be kept confidential.