Posted Sat Jul 23, 2005, 4:15am Subject: Re: Yet another HX flush question
The HX Love article describes a simplified flushing routine. The paragraph you cite could more succinctly say "The flush amount depends on how long the machine has been idle." The thread "Fine Tuning Brew Temperature on a Heat Exchanger Machine - A Workable Solution" covers this in excrutiating detail with volume per minutes idle (Abe Carmeli, Bob Yellin and others have developed charts for repeatable temperature accuracy within a degree).
That said, I think the HX Love article is due for an update to better explain the "pro method" versus the "water dance" method, plus introduce innovative modifications that further simplify the routine (as Dave / cannonfodder describes in "Max GH temp on a E61 HX machine?").
hifi_guy Senior Member Joined: 4 Apr 2004 Posts: 268 Location: Germany Expertise: I love coffee
Espresso: Simonelli Oscar & Personal V Grinder: Simonelli MDE, Mazzer Kony... Vac Pot: none Drip: Melitta Cone, now unused
Posted Sat Jul 23, 2005, 4:33am Subject: Re: Yet another HX flush question
Just speculating here: There may be differences depending on the heat transfer rate through the HX walls. If this is limited, say, by scale deposits on the outer and / or inner HX wall, Water temperature will drop if you over-flush. Actually, I suspect something along these lines to be the case with my Simonelli. The other extreme would be a brand new machine with a mirror-clean HX where you would have to go to very low boiler pressures initially (Scott's Atlas comes to mind). Right now, I flush 5-6 oz right before locking the PF. I heat the cup with the flush. emptying the cup and wiping cup and group dry before locking the PF takes about 10 sec.
Posted Sat Jul 23, 2005, 11:30am Subject: Re: Yet another HX flush question
Oh no - that's ok, really Dan. I already read past that part where you told 'me' to stop here (I am that kind of keep it simple person... for the most part)! I was just confused with that one part of overflushing. Any more details and I'll be drinking a few too many cafe correctos.. ;-)
Thanks for your article! Geoff
HB Said:
The HX Love article describes a simplified flushing routine....
...That said, I think the HX Love article is due for an update to better explain the "pro method" versus the "water dance"... -- Dan
Posted Sat Jul 23, 2005, 8:08pm Subject: Re: Yet another HX flush question
mattyj Said:
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.
it took a very sensitive yirgacheffe to show me the flaws of the flush/rebound method. like tiger and his swing, it took awhile for me to effectually switch my habits. but the flush-and-lock is now my favored method by far. and for the first time, i'm consistently nailing finicky beans and blends. one might even dare to use the word "clarity." or not...
mattyj Senior Member Joined: 5 Apr 2004 Posts: 1,092 Location: Sydney Expertise: I love coffee
Espresso: Expobar Office Pulser Grinder: Mazzer Mini Vac Pot: Hario Mocha 3 Cup ... broken...
Posted Sun Jul 24, 2005, 5:01am Subject: Re: Yet another HX flush question
Wow, thanks guys!
This has been so informative for me! My new expobar arrives on the 10th of August ... it's circled on my calendar, with the title, 'e-day' ... it may seem a tad silly to you, but for me, this is my first good machine, replacing my little (almost) clapped out sunbeam thermoblock.
Dan and Chris, I wanted to thank you guys in particular - in preparation for the new arrival, I've read so much of your stuff, and learnt heaps ... thanks!
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