Berkeley CSUA MOTD:Entry 43235
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2019/03/23 [General] UID:1000 Activity:popular
3/23    

2006/5/30-6/3 [Science/Electric, Science/GlobalWarming] UID:43235 Activity:nil
5/30    http://eed.llnl.gov/flow/02flow.php
        Excellent info on US Energy Flow Trends. 22.4 out of 27.9
        energy from petroleum for transportion is lost energy, which
        is expected given the inefficiency of modern internal combustion
        engine. However, 27.8 out of 40.3 electric power sector is
        electrical system energy losses, which is quite surprising to
        me. Is the current electric grid system as good as it
        can be, or is there room for improvement?
        \_ Do "electrical system energy losses" include losses at the point
           of generation?  If you're burning coal in a power plant you only
           get a certain percentage of the energy ...
           \_ It's been a while since I read anything on this but IIRC, when
              they talk about the electric grid losses they mean the losses
              that occur during transmission from point of origin at the plant
              to your wall socket (or at least your local hook up out on the
              street).  I have no idea how they calculate losses at the power
              plants themselves.
                \_ Transmission line losses are not that bad.  Something like
                   2% for every 1000 miles of high voltage wire?
                   \_ no idea.  maybe someone with a browser will come along
                      and help us out.  ;-)
                        "Transmission and distribution losses in the USA were
                         estimated at 7.2% in 1995 [1], and in the UK at 7.4%
                         in 1998"
2019/03/23 [General] UID:1000 Activity:popular
3/23    

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Cache (264 bytes)
eed.llnl.gov/flow/02flow.php
Energy Flow Charts | US Energy Flow -- 2002 The first flow chart gives quantities in quads and below that is the chart in exajoules. It also has charts that show some of the data viewed in different ways and, contains the chart of US 2002 Carbon Dioxide emissions.