Where is your HERMS temp probe?

[DeafSmith]

Have you just tried slowing down the flow from your pump?

Or speeding it up? Changing the flow rate has two opposing effects - for example if you slow the rate, you allow more time for heat to flow into the wort in the HEX, heating it to a higher temperature, but on the other hand you are heating less wort per unit time - I'm not sure which will be the dominant effect.

Maybe adding a motor driven stir paddle would help, given how much difference whirlpooling an immersion chiller makes - a lot more heat transfer when the wort is moving over the coils.

Probably best to get some details on other peoples systems who don't have the big temp differential - see what's working for them.

 

[McCuckerson]

I do stir with a 60rpm paddle. I have done fast to medium recirc. I can try slow next

 

[Walker]

Or speeding it up? Changing the flow rate has two opposing effects - for example if you slow the rate, you allow more time for heat to flow into the wort in the HEX, heating it to a higher temperature, but on the other hand you are heating less wort per unit time - I'm not sure which will be the dominant effect.

Yeah, I was just commenting on how to keep the temp difference between the HLT and mash to a minimum, but you are right.

There is no reason he has to crank the temp up 18*F higher than his mash-out temp. Just set it to the mash out temp and let the stuff circulate long enough and it will eventually get there.

He's got it cranked up to get it does as fast as possible I guess?

 

[McCuckerson]

Yeah, I was just commenting on how to keep the temp difference between the HLT and mash to a minimum, but you are right.

There is no reason he has to crank the temp up 18*F higher than his mash-out temp. Just set it to the mash out temp and let the stuff circulate long enough and it will eventually get there.

He's got it cranked up to get it does as fast as possible I guess?

I'm confused. I am not concerned with ramp time. At rest it has a 13deg difference. I think if I lengthen the coil and insulate the kettles it will improve. Thoughts?

 

[sonex]

sure retaining heat within your system will help, and a longer coil will transfer heat to the wort faster. I believe the others were trying to say you could cut the flow through the coil to give the wort more time to absorb heat.

 

[McCuckerson]

sure retaining heat within your system will help, and a longer coil will transfer heat to the wort faster. I believe the others were trying to say you could cut the flow through the coil to give the wort more time to absorb heat.

Yeah but then I'm not turning the water in the mlt over enough. It's a tradeoff

 

[McCuckerson]

I'm running a temp/cleaning cycle right now. I moved the TC to the output of the coil in the MLT. I ran autotune and the thing is dead nuts. The mlt is 154f and the hlt is at 154. The only thing I noticed is that the autotune ran A LOT longer than it usually does.

Am I witnessing the magic of the PID? I am so happy right now, but I would love for someone to explain what I am seeing.

Thanks,
McC

 

[sonex]

I'm glad you got auto tune to work for ya. Auto tune seems to over shoot before it wants to settle down for me. Good for you, wish I could explain it to ya but I have never been able to get it to work perfect for me.