> From: "Robert Ellefson" <vortex-h...@e2ke.com> > Sent: Monday, June 3, 2013 12:05:18 AM > >I did a detailed mesh model of a heat exchanger ... but gave it up > >because it was too sensitive to the parameter for heat >transfer > >from water to metal. > > > >See http://lenr.qumbu.com/rossi_ecat_oct11_c.php and > >http://lenr.qumbu.com/rossi_ecat_oct11_spice.php > > > >I'm now working on an RC model of the eCat .. progressing from a > >lumped model to a ladder model. > > Wow, I'm pretty impressed Alan, I don't think I've ever seen that a > thermal SPICE model of such complexity. Most of the significant > thermal analysis work I've been involved with has been done by MEs > using dedicated FEA applications, and the SPICE modeling was > typically used only by EEs for heat-sink selections and other random > little tasks. I think about two or three dozen elements is the most > I've seen actually used for thermal modeling before. > > Have you looked around at any open-source FEA tools that might be > used for your project? If there are any decent ones, I suspect > they'd lighten your workload considerably as compared SPICE, but I'm > not familiar with what's actually available, so this is just > speculation. > > Anyhow, best of luck with your efforts, and thanks for sharing.
I installed Elmer, but couldn't get it to work. (My ignorance, I think). The hotcat is easier, because it's radially symmetric -- just a cylinder in a cylinder in a ... I'll go as far as I can with Spice (which works) and then give Elmer another try.
