Re: Pressure and flow
No worries Kevin. It would have been an interested test, but my gut feel is that the electrical frequency would be too fast to have any noticeable effect anyway. Im more interested in the effects of mechanical vibration that can be felt by placing your hand on the machine during use. This effect would normally be very hard to isolate and test, but I might end up being able to test it during the R&D of another project. One of these days Id like to design a conventional electric machine (and as automated as possible) that incorporates the Rossa Hand Espressos fundamentals. If I manage to pull it off, it would certainly shake up the home espresso scene. So in the process of R&D for this project, I will be able to directly and objectively test the effects of mechanical vibration on espresso quality. If I dont die from old age before I get to do the test, Ill post the results.
This would be true for any machine that pumps directly from the boiler. Air is a great dampener, but machines that use a heat exchanger through the boiler on the line that feeds the grouphead will not have any air in the system. Any air in the line would be pumped through the coffee puck as the water comes through. My electric machine uses a heat exchanger through its boiler, and I imagine that the majority of good machines would use a similar design. As previously noted, I havent seen the internals of many machines, so maybe a more knowledgeable person could comment on the use of heat exchangers.
Thermoblock machines have a whole bunch of issues all to themselves largely resulting from the desire to design and build a cheap espresso machine. That said, Im sure the vibration from their pumps would not be helping their cause.
Now that would be an interesting experiment! I might even dig out and test my old Sunbeam during the pump isolation test described above. Will definitely post those results.
Originally posted by 7B7A7D300 link=1327651715/28#28 date=1329291870
Originally posted by 6D6C6B260 link=1327651715/28#28 date=1329291870
Originally posted by 6A4753414E4F4841675260475243260 link=1327651715/29#29 date=1329375246
Now that would be an interesting experiment! I might even dig out and test my old Sunbeam during the pump isolation test described above. Will definitely post those results.


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