BIAB with a Keggle - 3rd batch and still LOW efficiency

[Bobby_M]

There really is no way to effectively fly sparge grain in a bag. It may seem like it works from a big picture perspective, but the mechanics really only work in a vessel that is being drained. A stirred dunk sparge (batch sparge from a calculation/software perspective)

It's unfortunate that your grain supplier was so closed off to the idea of double milling. It's likely the person has never deviated from multi-vessel brewing and just doesn't want to hear it. What I would say to them is that if they are not willing to take the extra 2 minutes to run the grain through one more time, you will be finding a supplier that will. They are out there. If my customers ask for it, I'll turn their grain into 90% flour.

The last thing to consider is a shift in expectations. When you say that you're missing your numbers, a better way to say it is that your expected numbers were inflated. Your system efficiency is unique to you and recipes that you import must be scaled to your system. If the recipe says use this amount of grain for 1.060 OG, it's in relation to a stated efficiency. You adjust that efficiency to your system and use whatever grain plus/minus required.

 

[Sam_92]

You said you are using an electric keggle and maintaining the mash temp over the hour so I'm assuming you have a heating element at the bottom and a temp probe into the kettle somewhere. Are you taking temperature readings with a standard thermometer or trusting the temp probe? Did you calibrate the temperature probe? Where is the temperature probe in relation to the heating element?

I'm wondering if maybe your temp probe is up in the middle of the mash and calling for more heat when at the bottom of the temperature is high enough to denature enzymes from the bottom up. I have a very small electric kettle I built and I've seen it do things like that.