Thanks to all four your answers! I'll try to answer to all of you in one response just to make it more readable.
*Andy*: I was reading about PW reactors when I started to plan this kind of system but I really couldn't find too much information about it other than general aspects. I was trying to contact EATON to get information about their Vickers pumps for this application, but no luck so far. *Gene*: I was thinking about using inox tubing to avoid corrosion and for the ducts on the mold I was thinking about inserting some piping inside them to make them more corrosion proof. The other thing was to use some sort of additive in the water but I really don't know it there's such a product. Same thing goes for the pump wich is going to handle the high temperature of the fluid. *Nicklas*: That's the main concern about something like this, other than the investmen since this is a new field for me! *Chris*: I really was doubtful about that aspect since I read in some place that pressurised water reactors have an "air cushion" in the pressurizer to compensate for sudden increases in water pressure. But I guess I can't have that problem since I'm planning to heat the fluid using resistors. *Jim, Todd and Gregg*: I was a little bit reluctant about using some sort of oil because I thought that the heat tansfer ratio of the water is a lot better than any oil. But given the benefits in safety and simplicity of the system using those DOW oils I think I'm going to contact them to have some more information. I've been reading the datasheets and they should work pretty well for my application. In fact, I wouldn't matter to increase the heating and cooling time by 2 minutes in favour of more safety and simplicity. The maing thing is I would like that both circuits (cooling and heating) use the same fluid so I can use the same conducts in the mold. I hope I've been clear with this response method, and I know it's not the usual way here in the list but I didn't want to let anyone out! Thanks as always for your help! 2017-02-08 22:53 GMT-03:00 Gregg Eshelman <[email protected]>: > A liquid system has a safety advantage over a system filled with a gas, or > a liquid that will easily flash to vapor if there's a leak. > A hot liquid that stays liquid when pressure is let off will only spurt > through a leak for a short time as the pressure drops. It may spray into a > mist but it won't (as easily) fill a large volume with scalding hot > material. (If it's flammable when sprayed into a mist in air and there's an > ignition source, then you have a bigger problem.) > > Pressurized hot water will flash to steam (dry steam if it's hot enough) > and will keep going until the whole system is emptied, and the burning hot > steam will fill the whole room. > That's why pressure systems for air or other gasses or hot water get hydro > tested at low temperatures, to pressures higher than they'll experience > under normal operation. If something breaks, it spurts for a short time. If > it's a large break, it spews a lot of water but it's over quickly. > Pump it up to failure with a gas or heated water and it explodes with > shrapnel and possible injuries and deaths. > > > > From: andy pugh <[email protected]> > To: Enhanced Machine Controller (EMC) <[email protected]> > Sent: Wednesday, February 8, 2017 1:31 PM > Subject: Re: [Emc-users] OT: Need some guidance on high temp/pressure > water circuit > > On 8 February 2017 at 19:45, Jim Craig <[email protected]> > wrote: > > Dowtherm is used in thermal solar power plants. > > That sounds a lot less trouble than my molten salt idea. Those are > super-stable at high temp (and relatively inexpensive) but if allowed > to freeze would be very troublesome. > > > ------------------------------------------------------------ > ------------------ > 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 > -- *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
