Originally Posted by rvklein
While cool, did you think about the possibility of adding a recirculation fitting to the top of the HLT instead? I do this with a 90 degree bend which creates a whirpool in the HLT.
Hello, all my keggle's have fittings in the side at the top and the HLT has a whirlpool tube on the inside. Brewing 6 gallon batches with the three keggle set up during mash I use the HLT fitting on pump 1 to recirulate water in the HLT from bottom to top through the whirlpool tube. Pump 2 is used to recirulate wort from the MLT out through the HERMS coil and back through the top lid fitting in the MLT.
When I’m brewing 1 BBL the HLT & BK keggle’s are used as HLT’s and HERMS with the help of the Rinnai tank less water heater. I recirulate water in the BK out on pump 2 through the jacket on the 40 Gal MLT and back to BK top side input through whirlpool tube. Pump 1 recirculates wort from the 40 Gal MLT through the HERMS in the HLT and back to the lid fitting on the 40 gal MLT. With this configuration the water in the HLT was not being circulated and when I decided to build the stir motor. Originally I just used the HLT for HERMS and for the jacket on the 40 Gal MLT but I have more capacity by using the keggle BK on the jacket. With the automation during mash I hold the BK to 190 degrees and the automation controls the pump off/on to heat jacket as needed to assist in step mashing and maintaining mash temps. Using a combination of both the HLT/HERMS on the wort and the BK on the jacket of the 40 Gal MLT gives me quicker steps and greater control. Hope that makes sense? I am building diagrams to illustrate my processes and will post them once they are complete. I have them for the 6 gallon keggle configuration and will post them soon.
I’ve discovered through testing that the stir motor is much more effective than whirl pooling with the pump was. I think it’s due to the blades moving more water directly against the coil the entire depth. The blades run inside the HERMS and are angled to move water from the bottom to the top over the coil. I would highly suggest this configuration over a pump.
Here is a picture of the HLT with side top whirlpool return -