Re: [PSES] Thermal equilibrium - 10% rule

The subject itself can easily be a presentation at ISPCE. Doug, what you and Gert have done should be a formal paper. Please consider collaborating and making it happen. John From: Pete Perkins <0061f3f32d0c-dmarc-requ...@ieee.org> Sent: Sunday,

Re: [PSES] Thermal equilibrium - 10% rule

Doug, A great approach; it would make for an interesting ISPCE/PSES presentation and a paper. Go for it. :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 23427 Tigard, ORe 97281-3427 503/452-1201

Re: [PSES] Thermal equilibrium - 10% rule

Gert, As with Doug's method it would make for an interesting ISPCE/PSES discussion and paper. Put something together. :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 23427 Tigard, ORe 97281-3427 503/452-1201

Re: [PSES] Thermal equilibrium - 10% rule

Richard, I have tried a number of approaches in the past. Given that most products are quite complex with regard to all the potential heat sources/sinks and interfaces I decided that anything along the lines of FEA is impractical. I also tried the time constants idea which is analogous to RC

Re: [PSES] Thermal equilibrium - 10% rule

Hi Rich, The quotient of subsequent derivatives of equidistant samples of the temperature has a direct relation to the time constant. TC=Timestep/(1-(dtempn+1/dtempn)) Numerically this is easy to calculate in a spreadsheet Once the time constant is known it is easy to find the temperature value