I read the HX Love article on HB and am having a problem getting one point through my head...
I understand convention that you have to limit the cool down flush to avoid over cooling the gh. Why is this true when the 'water dance' chart levels out at 204' from about 7 seconds on (to infinity it appears)?
I understand convention that you have to limit the cool down flush to avoid over cooling the gh. Why is this true when the 'water dance' chart levels out at 204' from about 7 seconds on (to infinity it appears)?
I don't think that overcooling is a problem. The group head may actually be overheated until you flush a couple extra ounces after the sputtering stops.
The group head does not ever get overcooled unless you turn the machine off. The group of a thermosyphon machine is actively heated using boiler water (so the flush doesn't cool it down very much).
As far as I know there is no "convention that you have to limit the cool down flush to avoid over cooling the gh". IIRC there is no such statement made in Dan's article (as always, I could be wrong).
I can let my machine flow and flow and flow and flow for well over a minute and the temperature reaches a steady point and stays there. As long as I start my shot within about 30 seconds after flushing it always comes out pretty well for me.
In the Grimac Mia review, Malachi mentions the 'professional' version of the cooling flush, done just before pulling a shot, rather than before the dose, distribute, tamp.
Does anyone else do it this way? How long do you flush for/what amount of water do you flush/what signs are you looking for?
My reasons for asking are that next month I'm getting an expobar, and I'm not confident that my technique is good enough to have it all (the D.D.T. step) done in 30 seconds ... which, IIRC would mean that the group would get too hot again, and I'd need to flush again.
I'm not confident that my technique is good enough to have it all (the D.D.T. step) done in 30 seconds ... which, IIRC would mean that the group would get too hot again, and I'd need to flush again.
First I DDT, then (for a milk drink) I steam my milk. Finally I flush and immediately lock in and pull the shot. Click Here to see my typical sequence.
In the Grimac Mia review, Malachi mentions the 'professional' version of the cooling flush, done just before pulling a shot, rather than before the dose, distribute, tamp. Does anyone else do it this way?
Yes, for reasons of consistency. I can't time the DDT ritual exactly, but it's very easy to get consistent timing on the FLP (flush, lock, pull shot). For a hotter brew temp, you can HX temp surf (by allowing the water to heat up in the HX before pulling the shot). There have been quite a few CG posts on this. But IMHO this shouldn't be necessary if the boiler temp/pressure is set correctly.
mattyj Said:
How long do you flush for/what amount of water do you flush/what signs are you looking for?
In the Grimac Mia review, Malachi mentions the 'professional' version of the cooling flush, done just before pulling a shot, rather than before the dose, distribute, tamp.
Does anyone else do it this way? How long do you flush for/what amount of water do you flush/what signs are you looking for?
My reasons for asking are that next month I'm getting an expobar, and I'm not confident that my technique is good enough to have it all (the D.D.T. step) done in 30 seconds ... which, IIRC would mean that the group would get too hot again, and I'd need to flush again.
Best option for almost everyone is the Water Dance, but you can choose to do it immediately before pulling the shot or immediately before building it depending on what profile you want.
"If you’ve pulled a shot within the last five minutes, you’ll need to pay extra attention because the cooling flush will be much shorter than if the machine has been idle for 10-15 minutes (on the order of ¼ the amount of water). You may hear only a brief hiss and that’s it. Don’t draw too much water or the next extraction will be under temperature (sour)."
That's the 'convention' I was talking about... but it sounds like it might be a party of one?
JonR10 Said:
The group head does not ever get overcooled unless you turn the machine off. The group of a thermosyphon machine is actively heated using boiler water (so the flush doesn't cool it down very much).
As far as I know there is no "convention that you have to limit the cool down flush to avoid over cooling the gh". IIRC there is no such statement made in Dan's article (as always, I could be wrong).
I can let my machine flow and flow and flow and flow for well over a minute and the temperature reaches a steady point and stays there. As long as I start my shot within about 30 seconds after flushing it always comes out pretty well for me.
I suppose I could be wrong, like I said... (And I was absolutely wrong about the article reference)
The specifics will depend on your machine's design and boiler setting...
But my coolest steady-state temp is maybe 202F (IIRC) so like I said I can flow water until the drip tray fills up and still lock and load and pull a good-temperature shot every time.
"If you’ve pulled a shot within the last five minutes, you’ll need to pay extra attention because the cooling flush will be much shorter than if the machine has been idle for 10-15 minutes (on the order of ¼ the amount of water). You may hear only a brief hiss and that’s it. Don’t draw too much water or the next extraction will be under temperature (sour)."
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