BrewRunning
Well-Known Member
For those of you using a HERMS system, how do you calculate your strike water temp?
I just did my first brew on my 30g Spike system. I used the standard formula that I've always used;
(.2/R)(T2-T1)+T2 Where R=water/grain ratio T1=grain temp and T2= target mash temp
For this brew I used a 1.40 water/grist ratio. My target mash temp was 154 and grain temp was at 88 degrees from sitting in the garage.
(.2/1.4)(154-88)+154
(.1428)(66) = 9.42 degrees of expected drop in temperature after mash + 154 = 163.42 for strike water
I got the MT to 164 and mashed in but the temp settled too high at 157. So approximately only a 7 degree drop in temp. I'm assuming this is due to the MT already being heated up so no loss for MT temp.
I'm looking to more accurately predict the strike temp in the future. Does the following make sense?
If I use the 7 degree drop in temp I experienced and divide by 66 = .106 and multiply that times the ratio (1.4) I come up with 0.148.
Is it as easy as taking my original formula and changing the .2 to .148 for future brews? Am I off on the math?
Hope this post isn't too confusing. I'm no math whiz so I could be over thinking this.
Thanks,
I just did my first brew on my 30g Spike system. I used the standard formula that I've always used;
(.2/R)(T2-T1)+T2 Where R=water/grain ratio T1=grain temp and T2= target mash temp
For this brew I used a 1.40 water/grist ratio. My target mash temp was 154 and grain temp was at 88 degrees from sitting in the garage.
(.2/1.4)(154-88)+154
(.1428)(66) = 9.42 degrees of expected drop in temperature after mash + 154 = 163.42 for strike water
I got the MT to 164 and mashed in but the temp settled too high at 157. So approximately only a 7 degree drop in temp. I'm assuming this is due to the MT already being heated up so no loss for MT temp.
I'm looking to more accurately predict the strike temp in the future. Does the following make sense?
If I use the 7 degree drop in temp I experienced and divide by 66 = .106 and multiply that times the ratio (1.4) I come up with 0.148.
Is it as easy as taking my original formula and changing the .2 to .148 for future brews? Am I off on the math?
Hope this post isn't too confusing. I'm no math whiz so I could be over thinking this.
Thanks,