Syltherm or Dowtherm are just such oils that are used in heat transfer applications. Dowtherm is used in thermal solar power plants. There are others out there but I cannot remember them off the top of my head right now.
If the right one is selected they would be much more stable at 280°C Jim On 2/8/2017 12:24 PM, Todd Zuercher wrote: > What about using some sort of oil, or some other liquid that would not have > the high vapor pressures of water? > > > ----- Original Message ----- > From: "Chris Albertson" <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Sent: Wednesday, February 8, 2017 12:49:16 PM > Subject: Re: [Emc-users] OT: Need some guidance on high temp/pressure water > circuit > > The only thing I know about this is that you absolutely need to keep air > out of the system. It all needs to be designed so that trapping air in the > plumbing is impossible. When/if the plumbing bursts having compressed air > inside makes it a lot more dangerous. > > > > On Tue, Feb 7, 2017 at 3:30 PM, Leonardo Marsaglia < > [email protected]> wrote: > >> Hello to all! >> >> I'm in the process of designing and planning a system to rapid >> heating/cooling a mold for plastic injection. The project is still in the >> board so I think it's a good time to ask help from you guys. >> >> I'm trying to make the system as simple as possible so I'll tell you what I >> have in mind and what are my doubts and concerns. So here it is: >> >> A high pressure vessell with resistors is what I'm planning to have as an >> accumulator and heating device. (The vessel should have pressure relief >> valves and maybe a rupture disc). The idea is to reach 1000 PSI (to avoid >> water to start boiling) and 280°C. From what I've been reading the best >> pump for this cases is a gear pump because it can handle better the thermal >> dilatation of the components. >> >> My main concern is, at the inlet of the pump the pressure is going to be >> 1000 PSI, and I have only worked with pumps at atmospheric pressure at the >> inlet side. Is this going to be a problem? The differential pressure at the >> output is intended to be 50 or 100 PSI more than at the inlet just to make >> the water flow through the mold and return to the vessel. There are going >> to be valves to switch between cool and hot water. >> >> Also I may need to consider using special materials on the pump because of >> the corrosion, or may be some additives in the water, but my main concern >> is the rough construction of the system. I'm attaching a little diagram >> with my idea just to start and discuse if it's doable or not. Needless to >> say I'm going to take every safety measure possible with this kind of >> system. >> >> I would be thankful if you can guide me or tell me if this is too >> complicated and dangerous to even give it a try. >> >> Thanks as always! >> -- >> *Leonardo Marsaglia*. >> >> ------------------------------------------------------------ >> ------------------ >> 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 >> [email protected] >> 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
