Gene, that is very interesting. I have a friend that has an old sulphur dioxide refrigerator in his shop. It works great and maintains the most consistent temperature I have ever seen, even if it is 100F out the Pepsi in it will be just a little slushy, which is the way I like it.
Here is a picture: https://goo.gl/photos/76idPzpZ5JPunsAt6 He did a power draw test on it and a small dorm fridge, and the modern, much smaller, energy star rated fridge used noticeably more energy, and it did not have a freezer section to speak of. I guess if those sulphur dioxide units are put together right to begin with can last 80+ years, but if not ... Cheers, Kurt On Mon, Apr 10, 2017 at 2:51 PM, Gene Heskett <ghesk...@shentel.net> wrote: > On Monday 10 April 2017 13:59:37 Todd Zuercher wrote: > > > Those ammonia cycle refrigerators are pretty common in RVs and > > campers. > > > Uh, no. 99% of those that run on bottle gas are sulphur dioxide based > units. Actually quite decent efficiency, but the problem with sulphur > dioxide is that its a very unstable gas, seeking out a molecule of water > so it can borrow the oxygen atom from it so you have a couple atoms of > hydrogen left wondering where their oxygen went, but the oxygen is now > part of a sulphur-trioxide molecule. And guess what, sulphur-trioxide is > just the technical name for sulphuric acid, CP. So when they gas them > up at the factory, the last thing they do is pull the best vacuum they > know how to do and heat the coils to drive off all the airborn moisture > they can while holding that vacuum for what to the production people > think is a waste of time. But anything less will eat their profits in > warranty claims. I have read that one molecule of water left in such a > system, will corrode itself internally, either pinholing the pipeing > someplace, or the corrosion products will block the gas flow, in less > than 10 years from the date they seal it shut. > > Not to mention that this stuff will do the same thing in your lungs, with > often fatal results by stealing the water in the lung tissues to make > sulphuric acid right in your lungs. The old monitor top GE > refrigerators were filled with that stuff, and they were known to be > killers in the middle of the night if you didn't wake up and vacate the > premises quickly. I had an aunt and her family that did wake up, but > they couldn't really breath easy for several months afterwards. > > Now you know "the rest of the story" about camper fridges. If you can't > hear a compressor running, I'd never sleep in a camper so equipt. > > > ----- Original Message ----- > > From: "Kurt Jacobson" <kurtcjacob...@gmail.com> > > To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> Sent: Monday, April 10, 2017 > > 12:23:20 PM > > Subject: Re: [Emc-users] Way OT, Unexpected Result from Refrigerator > > > > > I am impressed that someone managed to come up with this cycle: > > > http://www.cs.cmu.edu/~mnr/fridge.html > > > > We used to see quite a few ammonia cycle based refrigerators and > > central air conditioning units down here in the south (Georgia), but > > they are becoming scarce now. They were generally reliable and very > > economical to run, although some of the cheaper units had problems > > with corrosion in the coils causing them to fail. > > > > I was interested in the cycle and as a project for an advanced > > thermodynamics class I did a detailed analysts of if it with operation > > cost comparisons etc. As I recall it came out making compressor based > > systems look very undesirable from an operating cost standpoint. The > > funny thing is that the power company was offering rebates to people > > to encourage them to replace there "inefficient" natural gas powered > > refrigeration systems. Now they are offering rebates to replace > > "inefficient" gas furnaces with heat-pumps. I think I see a pattern... > > > > Cheers, > > Kurt > > > > On Mon, Apr 10, 2017 at 12:00 PM, andy pugh <bodge...@gmail.com> wrote: > > > On 10 April 2017 at 16:37, Jon Elson <el...@pico-systems.com> wrote: > > > > If the condenser pressure is too > > > > low, you won't get any liquid at all, and the Carnot process > > > > turns into a really ineffective Brayton (all gas) process. > > > > > > I am impressed that someone managed to come up with this cycle: > > > http://www.cs.cmu.edu/~mnr/fridge.html > > > > > > > > > -- > > > atp > > > "A motorcycle is a bicycle with a pandemonium attachment and is > > > designed for the especial use of mechanical geniuses, daredevils and > > > lunatics." > > > — George Fitch, Atlanta Constitution Newspaper, 1916 > > > > > > ------------------------------------------------------------ > > > ------------------ > > > Check out the vibrant tech community on one of the world's most > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
