Mash and strike water app for Nook tablet.

[fildirt]

Tryiny to find a good mash and strike water calculater app for my nook tablet.
I've loaded several including Beersmith, to only name a few. I've brewed 3 all grain batches so far ( flippin newby) and keep having to add boiling water to get to my temp. I'm pre heating my mash tun, checking my grain temp, all the steps they say to do. Any sugestions?

 

[Nosybear]

No calculator can take all the variables in your system into account. Hitting mash temps with a passive system - a cooler - is fiendishly difficult. What you need to do is to make several batches using one calculator and determine the heat loss of your system. You want to know how much heat, measured by temperature, your system loses, both with the initial addition of strike water (how much heat it takes to warm the vessel) and over time (how much does your system cool over time). This will change with the ambient temperature of the room, with the mash temperature you use.... And then there's altitude: Water here near Denver boils at about 200° rather than 212° at sea level. You're going to have to be an empirical scientist to get the temps to come out right - learn your system, measure everything at every point, adjust as needed. At our scale, it's an art, particularly using passive systems. Enough batches and you'll know how your system reacts and you can get close enough that, for homebrew, it doesn't matter.