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All grain brewers can be obsessive about the efficiency of their brewing system. This week we will look at 5 methods you can use to improve your overall brewhouse efficiency.
All grains in a beer recipe have a potential ideal yield, usually expressed as the find grain dry yield or potential. The fine grain dry yield is typically measured in laboratory conditions by powdering the grain and measuring the maximum possible extract. In the real world, only a fraction of the ideal yield is achieved due to mash inefficiencies, sparging limitations, deadspace and trub losses.
The overall percentage of the potential grain sugars absorbed into the finished wort is called the brewhouse efficiency. Achieving higher efficiency on a consistent basis lets you use less grains to achieve a target original gravity.
All grain brewers, particularly those who are inexperienced, often have low efficiency numbers. Lets look at five ways to increase your efficiency number:
1. Improve the Milling of your Grains
The crush of your grains makes a significant difference in the efficiency of your mash and sparge. Grains should be finely crushed, but the milling should leave the hulls largely intact to act as a filter bed. A dual roller mill such as the Barley Crusher is ideal for achieving this. Note that if you crush your grains too finely you will plug up your filter bed resulting in a “stuck mash”. If you get a stuck mash, your filter bed will clog up and the wort will stop flowing.
2. Mash Out or Sparge with Hot Water
Hot water during the mash out and sparge helps the sticky wort flow more freely. Ideally you would like to raise the mash temperature to about 178F and then use 178F water to sparge. A mash out infusion addition can be used to help raise the temperature of your mash as you sparge.
3. Sparge Slowly
Most beginners attempt to sparge their mash much too fast. Sparging too quickly leaves insufficient time for the hot water to extract the sugars in the grain bed. Limit the flow out of your mash tun to just above a trickle. It should take 30-50 minutes to fully sparge a 5 gallon all grain batch (about 6 gallons of wort).
4. Minimize Losses in your System
Losses anywhere in your brewing system, including deadspace in the mash tun, transfer lines, pumps, and trub at the end of the mash result in lost wort. The lost wort takes sugars with it, reducing your overall brewhouse efficiency. Use a properly sized mash tun, and work to eliminate deadspace in the system.
5. Pick a Properly Designed Mash Tun
The design of your mash tun and false bottom or screen can have a huge effect on the efficiency of the mash process. A round, cylindrical mash tun is generally considered best, as it leaves the depth of the grain bed about equal to its width. This is one reason cylindrical water coolers are popular.
The false bottom ideally will cover the entire bottom of the mash tun but have minimal deadspace underneath it. This will provide an even flow across the entire grain bed giving better efficiency.
If you have your own suggestions on how to improve brewhouse effiency, feel free to leave a comment below. Thanks again for visiting the BeerSmith Home Brewing Beer Blog. Don’t hesitate to subscribe for regular delivery. Have a great holiday and happy brewing.
1 user commented in " 5 Ways to Improve your All Grain Beer Efficiency "
Follow-up comment rss or Leave a TrackbackI have a cylindrical mash tun and have a developed technique to increase efficiency. All of your 5 points are very valid though I would suggest one more: establish a consistent grain bed. This is essential to ensure that sparge water flows evenly through the grain bed. Too fast of a flow can create water channels. Too slow can compact the grain bed and also create water channels to form. The goal is to rinse the grain column evenly. For me, this takes attention over 40-60 minutes but dramatically increases my efficiency. If I’m not in the mood for this, I just add more grain initially to compensate for the lack of efficiency!
I keep my hot liquor tank at 180′F and start my sparge with adding 1/2 gallon of sparge water to the mash tun.
I then collect about a 1/2 to 3/4 gallons from the mash tun and bring it up to a boil.
After, I pour the boil back into the mash tun and stir to distribute the heat. For my 5 gallon batches, I do this once more to bring the grain bed up to about 170′F. VERY IMPORTANT, each time I pour the hot mash liquid back to the tun, I stir the grain bed to circulate the heat and to establish a consistent grain bed.
When you pour out of the mash tun, the grain becomes compressed. Ideally, you want the grain bed consistently in solution so the sparge water flows through it rather than re-routing through compressed areas.
After stirring each time, I allow about 10 minutes for heat transfer and grain bed settling.
Patience and attention to the grain bed is a huge factor for efficiency!
Keep posting, I enjoy reading your blog!
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