Originally Posted by garbageman
Can you briefly explain how you sparge? I was considering doing full mash with all the water needed to boil and no sparge. Basically getting the efficiency I need from recirculating the mash.
I use my RIMS as a tankless water heater during the sparge, supplying feed water directly from my house supply. It's very capable of delivering 1 qt/min at 170 deg, so I don't need an HLT for supply.
The output of the RIMS only goes to a hose that sits on top of the grain bed in the MLT. I switch the RIMS pump input from the MLT to fresh water to put hot sparge water on top of the grain bed slowly. I adjust the pump output here to lower the flow rate for sparging as the RIMS does all of the heating from my cold water supply. I run the MLT drain from the false bottom through a second pump and into the boil kettle. I let the RIMS add the heat necessary to bring the supply water to sparge temperature controlled by the PID. Since the RIMS is now only heating water it doesn't matter what the flow rate is, as there is no chance for scorching anything. I do have alternate exit conditions set to shut things down if the sparge water gets too hot.
Since my boil kettle is electric, I start another BCS process when the element has been covered to bring up the wort to a boil. While it is heating I finish the sparge and shut down the RIMS PID and first pump.
Hope this helps explain my process. One of these days I will do a complete writeup on my system, as I have put a lot into the BCS programming to try to fool proof my system and it is somewhat hard to describe in words only without diagrams.