MyloFiore wrote:From what I was able to gather (it did take me a while because there is one section that is not visible):
HLT -> Pump on right -> Outside of Coil -> Tower on right (water tower)
MT or BK -> Pump on left -> Inside of Coil -> Tower on left (wort tower)
u got it. here's a really shitty schematic from word. my computer skillz are ass:
basically, the HLT serves as the heat sink for the MT. there's a type-j thermocouple in the HLT that monitors the water temp and sends the info to the PID control. The PID sends a "heat" signal to a 7000W hot water heater element via a 50A solid state relay whenver it senses a drop in temp below my PID setpoint. During the strike water preheat and mash, i constantly recirc the HLT water to get some uniformity and fast rise. Running on 240V, the HLT can heat water at about 5 degrees a minute at full clip. here's the inside. you can see the t/c on the right wall of the HLT:
the MT has no heat source of its own. i recirc the wort thru the mash pump, then thru the inside of the CFC and back to the left return arm. the water from the HLT goes thru the right pump, the outside of the CFC in the opposite direction from the wort, then back to the right return arm. there's a valve between the MT and the BK to allow me to lock off the MT line so I can take it off to clean and empty it during the boil.
so essentially, the MT picks up heat from the HLT. i've found that without any isulation on the MT, i lose 3 degrees of heat in the pickup, so for the mash, i set the HLT PID to mash temps +3 degrees. this holds my mash rock steady. since i brew indoors, it's also very predictable.
for cooling, i initially wanted to go with ice in the HLT and recirc that. not a good idea - too much of a PITA - 10 gallons of wort burns thru too much ice. i've since added 2 splice valves to take tap water right into the water side of the CFC.
before:
after:
the BK has its own 7000W spa heater element running on 240V. that's controlled by a rheostat dimmer wired into a triac (basically a 10,000W dimmer switch) and connected thru to a dryer plug. see that here with the heat sink for the triac and SSR:
i have 2 return valves at the end of each arm for different stages of the brewday. during the preheat and mash, the left valves are closed and the right valves are open. this directs flow in loops; one from the MT -> MT and one from HLT -> HLT. during sparge, i close the rights and open the lefts. This directs flow from MT -> BK and HLT -> MT.
i clearcoated all of the copper. otherwise it would tarnish and look shitty. and i cant have that...
i hardpiped all the copper b/c it was easier to insulate with armaflex that way. also i never lose prime on the pumps b/c once the water is in the lines, it's a closed system. at the end of the brewday i flush all the lines with hot water and then use this little doohickey to hook up CO2 and blow the water out:
jeez that was a long post...