13. Flow & Temperature Simulation - La Pavoni Lever Espresso Machine
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- čas přidán 13. 09. 2024
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An exploration of the OnShape CAD model of the La Pavoni Espresso Machines to see how the water swirls around the group head sleeve and the effect on temperature entering the brew chamber.
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• La Pavoni Lever Espres...
John, fantastic stuff. I have a Gen three Europiccola and I have placed a temperature probe linked to an LCD display on the left hand side of the group. For me, I always tend to start my shots when the temperature reads in the low 80s because I find when my temperature display reads 89 or 90° at the end of the shot that's when the water starts bubbling from the bottom of the basket. So I am assuming that with my machine and that particular temperature probe there is roughly a 10 or 11° average difference between the temperature of the water inside the group and the temperature reading. The Coffee taste great but I still find the temperature management confusing.
Ed, Clearly you found that using a temperature probe on the outside of the group head shows the temperature on the outside of the group head. There is indeed a temperature difference, but there is also a significant time lag. For me, I stick to a routine where I turn my G3 machine on about 30 minutes before I use it. Then I pull my shot. If I deviate from that, things get funky.
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I don't own one but as an engineer I appreciate the model, very fun!
Thanks
Brilliant!
Thanks!
Amazing! I'd love to have a similar flow simulation for the gen 2. Also would it be possible to do a much longer simulation to see what the effect would be over several shots?
Challenge accepted. Timeline specifically vague.
Brilliant 👌 ... but may I ask if that is Transient free surface CFD ?
in another word how did you manage to create the cold water region .
The simulation tool allows you to define a solid body as water with an initial temperature. So I created a solid body that fills the void inside the group head as water would. I assigned this body a temperature of 90C. For this solid body, I added an atmospheric outlet (for the water to flow out of) and a pressure inlet where I introduce 120C water. Did I answer your question?
@@JohnMichaelHauck all clear right now ...thanks a lot I really enjoy your content .
Formidable
Wow, I'll take that as high praise. I think. Now I'm not so sure. Well, thanks!
so the sleeve on the Gen 3s is made of plastic?
Yes they are.
Any conclusions?
Well, the obvious conclusion is that modeling something that approaches reality is really hard!
I would think we would first need to model the other materials involved such as metal and plastic. I also think we need to model the role of air and steam in the system too. Until then, I'm not sure we can draw any really defensible conclusions. Sorry.
I hope this video encourages others to think about what may be happening.
I also think that while it may appear to be a simple machine, the La Pavoni is really a complex system.