"Ken Javor" wrote: > > I wasn't going to weigh in on this, but here goes. For residential and > commercial non-industrial use, heating and air-conditioning must consume the > most power. Since these are feedback controlled systems, lowering power > consumption by reducing line voltage would only increase the amount of time > the heater/ac system was "on." Am I missing something?
I hope some people are still reading this thread. Interesting. I took a 120vac/60Hz fan in the lab and tested it to see what effects I'd get lo-lining a synchronous device. I'm using a Pacific SmartSource 360-AMX AC power source which gives me several readouts. Input KVA KW PF Amps Amps vac RMS Peak 125 0.049 0.051 0.979 0.413 0.650 120 0.046 0.048 0.978 0.409 0.625 115 0.042 0.045 0.976 0.393 0.600 110 0.039 0.041 0.976 0.381 0.625 108 0.041 0.040 0.978 0.372 0.575 105 0.039 0.038 0.975 0.366 0.600 100 0.036 0.035 0.975 0.350 0.575 A 5% reduction from 120vac to 115vac (if you're willing to accept 115 being approx. 114) yields the following changes ... KVA -8.70% KW -6.25% PF -0.20% AMPS RMS -3.91% AMPS PEAK -4.00% A 10% reduction from 120vac to 108vac yields the following changes ... KVA -10.9% KW -16.7% PF 0.0% AMPS RMS -9.0% AMPS PEAK -8.0% So, the other concern I have is the regular variation of the public mains. The grid must vary and I don't have any information how much it varies during the course of, what, a week, month, year? If the line was reduced to 108vac, what would be the anticipated low line during normal operation? - Doug McKean ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
