Unread
Replies
American Homebrewers Association  AHA Forum
Log In
Register
1 Hour
1 Day
1 Week
1 Month
Forever
American
Homebrewers Association
Forum
Home
Help
Search
Login
Register
Membership questions? Log in issues? Email
info@brewersassociation.org
American Homebrewers Association  AHA Forum
General Category
General Homebrew Discussion
Tinseth Hop Calculation Help
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: Tinseth Hop Calculation Help
(Read 4724 times)
NorthernIke
Cellarman
Posts: 51
Tinseth Hop Calculation Help
«
on:
January 16, 2010, 12:50:56 pm »
I'm sick of looking up hop utilization numbers when building recipies. I use a spreadsheet that I built for my brewing "software".
I need some help building an equation in Excel. I use the Tinseth formula, and on his page on of the stated factors is "boil time factor". This is determined by this equation:
The Boil Time factor accounts for the change in utilization due to boil time:
Boil Time factor = 1  e^(0.04 * time in mins)

4.15
My question is what does "e" refer to in the above equation? How do I program this into Excel?
Here is Tinseth's page where I got the formula:
http://realbeer.com/hops/research.html
Thanks!
Logged
NorthernIke
Cellarman
Posts: 51
Re: Tinseth Hop Calculation Help
«
Reply #1 on:
January 16, 2010, 12:54:16 pm »
From Wikipedia:
http://en.wikipedia.org/wiki/E_%28mathematical_constant%29
The mathematical constant e is the unique real number such that the value of the derivative (slope of the tangent line) of the function f(x) = ex at the point x = 0 is exactly 1.[1] The function ex so defined is called the exponential function, and its inverse is the natural logarithm, or logarithm to base e. The number e is also commonly defined as the base of the natural logarithm (using an integral to define the latter), as the limit of a certain sequence, or as the sum of a certain series (see the alternative characterizations, below).
e is one of the most important numbers in mathematics,[2] alongside the additive and multiplicative identities 0 and 1, the constant π, and the imaginary unit i. (These are the five constants appearing in one formulation of Euler's identity.)
I guess I'm no Mathlete! I'm going to try and plug this into Excel...maybe it's smarter than me...
Logged
NorthernIke
Cellarman
Posts: 51
Re: Tinseth Hop Calculation Help
«
Reply #2 on:
January 16, 2010, 01:12:42 pm »
Thanks to Wikipedia..."e" can be described as:
2.71828182845904523536
This seems to make the Excel formula work like a champ! Maybe this will come in handy for someone, someday...but probably not!
Logged
a10t2
Official Poobah of No Life. (I Got Ban Hammered by Drew)
Posts: 4696
Ask me why I don't like Chico!
Re: Tinseth Hop Calculation Help
«
Reply #3 on:
January 16, 2010, 01:28:37 pm »
You can also enter it exactly (or at least, to a whole lotta digits  I don't know if Excel uses a stored value or not) by using the exp() function.
Logged
Sent from my Microsoft Bob
Beer is like porn. You can buy it, but it's more fun to make your own.
Refractometer Calculator

Batch Sparging Calculator

Two Mile Brewing Co.
hopfenundmalz
Global Moderator
I must live here
Posts: 10574
Milford, MI
Re: Tinseth Hop Calculation Help
«
Reply #4 on:
January 18, 2010, 05:33:42 pm »
Remember that your input data will be 2 sig. figures.
Don't quote your output IBU's to 12 decimal places.
Logged
Jeff Rankert
AHA Lifetime Member
BJCP National
Ann Arbor Brewers Guild
Homebrewing, not just a hobby, it is a lifestyle!
skiwithg
1st Kit
Posts: 8
Re: Tinseth Hop Calculation Help
«
Reply #5 on:
January 19, 2010, 04:47:58 am »
FYI  Tinseth was on a recent episode of Brew Strong podcast.
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
American Homebrewers Association  AHA Forum
General Category
General Homebrew Discussion
Tinseth Hop Calculation Help