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Messages - a10t2

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3136
Ingredients / Re: Substitute for Special "B"?
« on: January 16, 2011, 09:42:30 AM »
I think the closest I've come across is an Extra-Dark English crystal malt, typically about 160 SRM. Weyermann's new CaraAroma sounds like it's supposed to be similar, but I haven't used it yet. Special B is pretty unique. A US crystal malt won't be all that similar IMHO.

3137
Yeast and Fermentation / Re: Hemocytometer
« on: January 16, 2011, 09:37:52 AM »
To give you a starting point, I've found that diluting 100:1 typically means counting about 100-200 cells.

3138
All Grain Brewing / Re: heatstick/heat exchange
« on: January 15, 2011, 08:28:58 PM »
I don't know anything about commercial PID units, but as a control algorithm I have to think it's overkill for this application. Unless you're going to set up a PWM setup, there's no point using anything other than a basic, linear, thermostat-type controller. Using your 2°F differential, set the target 1°F higher than your desired temp, get a 1-2 kW element and a relay for it to control, and you'll be in business. That's the basic setup we use for temperature control in our 7 bbl brewhouse, and it's all you need.

3139
All Grain Brewing / Re: heatstick/heat exchange
« on: January 15, 2011, 10:28:58 AM »
Is that 2°F? As a practical consideration, I wouldn't worry about variations smaller than that. If precision is a serious concern, though, the Ranco ETC series will let you set a 1°F differential.

I don't think you'll be happy with a 500 W element either, unless all you're using it for is to maintain temps. That will only raise the temperature of a typical mash (10 lb grain, 4 gal water) by 1°F every 1.3 minutes - assuming no losses. Doing a step mash would be pretty impractical.

$70 (or really, $141) for an element seems pretty pricey. It's nice that they're sealed and all, but I'd still go with the $15 one from the hardware store. I'm a tightwad though.

3140
Equipment and Software / Re: Batch Sparge Theory
« on: January 15, 2011, 10:17:15 AM »
Makes me wonder if we need to add a few terms to describe gravity:

How about HG: 20-30°P; VHG: 30-40°P; UHG: >40°P?

3141
Equipment and Software / Re: Batch Sparge Theory
« on: January 15, 2011, 10:15:07 AM »
Nonetheless, being a practical person, I think the hypothetical 3-D MLT design isn't.

I definitely think it would work. I'm less convinced that there would be a benefit over more conventional designs.

If lautering speed is the concern, I think all the same concerns that apply to fly sparging would also apply to batch sparging. The absolute best design is probably a false bottom, since you would effectively be able to drain the entire area of the mash simultaneously. And you'd want the shallowest grain bed possible.

As a practical consideration, I have a lautering system that's optimized for fly sparging. (A slotted CPVC manifold.) Using a March pump, I average about eight minutes from starting the runoff to filling the kettle. That probably means each ~3.5 gal runoff takes about two minutes. I don't see any reason to experiment with other designs.

3142
The Pub / Re: Science Project for my 5 year old
« on: January 13, 2011, 10:39:41 AM »
I guess I'm late to the party, but how about looking at fermentation? No reason to explicitly tie it into beer. Sugar water and yeast in a jar, put a balloon on top. Using different amounts of sugar, show that the size of the balloon is proportional to the amount of food the yeast have. Explain that yeast eat food and expel CO2, just like people do. Tie it into the circle of life on our fragile planet. Science fair judges eat that s*** up.

3143
General Homebrew Discussion / Re: Swirling The Contents of Your Carboy
« on: January 13, 2011, 10:33:05 AM »
I know htat rousing yeast can be a technique for getting better attenuation in big beers, but do you think it has any negative (or positive) effects on an average beer?

I can tell you it isn't having any negative effects on your beers! I don't see how it could be a problem. Oxidation isn't a concern at that point. There are macro breweries that agitate continuously to speed up fermentation - actually, I have to do it to four tanks today. Stupid Colorado winter keeps crashing my beers...

Fast Fourier Transform?

My brain does that every single time. ::)

WLP002 does not respond well to this type of stimulus.  It has a tendency to stick to the bottom of the fermenter and if you do rouse it, it over attenuates.

Is that based on a controlled test? What is over-attenuation in this context? I don't doubt that agitation could reduce the FG, but when I hear "over attenuates" I think of a beer finishing drastically lower than anticipated.

3144
Physics:Math::Sex:Masturbation ;)

http://xkcd.com/435/

3145
General Homebrew Discussion / Re: All little math help please
« on: January 12, 2011, 05:12:15 PM »
I think most DME is closer to 43 point-gal/lb. Pure sucrose is 46.2. It doesn't really change anything though - you need about 0.6 lb.

3146
Chemistry is just applied physics. ;D

3147
I think its odd to do a secondary and then bottle.

I also think that it's odd to do a secondary and then keg. Kegged beer is its own secondary in my opinion.  ;)

3148
But for two different temperatures and pressures corresponding to a similar solubility equilibrium won't the higher temperature reach equilibrium much quicker?  Intuitively it seems like this would follow a 10C = 2x the speed rule of thumb from chemistry, unless I am missing something.

Unfortunately, this isn't a chemical reaction. Dissolving a given amount of CO2 will take roughly the same amount of time no matter what the temperature - actually, it would probably be slightly faster at lower temperatures.

3149
Ingredients / Re: Hop recommendations for a light ale
« on: January 09, 2011, 08:05:53 PM »
Willamette would be my choice, but I'm on a bit of a kick right now.

3150
Equipment and Software / Re: Electric Alternatives to turkey fryer.
« on: January 09, 2011, 08:03:59 PM »
50A circuit is not that much for 6BBL. Are we talking 3 phase or single phase? If it is single phase we are talking about 10,000W.

Yes, that was a typo. It's an 80 A circuit, 18 kW element. At 33 kW I think you'll have a great system.

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