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 In the summer of 2001, The National Environmental Education Foundation conducted a survey of 1,503 American adults about energy. Although 75% of those surveyed said they knew “A Fair Amount” or “A Lot” about energy, only 12% could correctly answer 7 or more questions on a 10 question energy quiz. The quiz is on pages 4 and 5 of the report (pages 15 and 16 of the PDF). So what’s your “energy IQ”? 
In earlier years of Lawrence Livermore National Laboratory’s spaghetti diagrams, such as the above example from 1976, the ends of the swaths were more like the simpler energy flow diagrams. On the above diagram it’s easier to see that the height of the lines on one side would end up around the height of the lines on the other side than it is on some of the newer versions with oversized boxes that serve as labels. But the boxes are a useful tool, and can let us think about embedding another diagram form — box diagrams — into the spaghetti diagram. Box diagrams are used for teaching electricity, and were developed by Peter Cheng and David Shipstone in the UK. The picture below is from part 1 (Word doc) of their introductory paper (here’s the Word doc part 2). Since power is the voltage across a bulb multiplied by the current [...] 
This “spaghetti diagram” (aka Sankey diagram, or Energy Flow Chart officially) is the 2008 version. Lawrence Livermore National Lab (LLNL) has been making these things since the 1970s. It’s more detailed than a simpler national energy flow diagram because it includes “rejected energy.” It’s also more complex — it actually includes within itself the electricity flow diagram. It’s a pretty cool visualization. The main thing I dislike is that it doesn’t split up transportation or electricity generation “rejected energy” by sector. Since these are really the two biggest sources of “rejected energy,” you can’t see which group is the biggest “rejector.” Below, in an undated but funkier design, they’ve not only split up transportation into light duty vehicles, freight/other, and aircraft, they’ve also added domestic and net imports to petroleum and natural gas. They still haven’t split up “Electricity Generation, Transmission & Distribution Losses,” so we don’t know who “loses” the most [...]  Here’s a picture from What You Need to Know about Energy by the National Academy of Sciences. It shows 100 energy units of coal being used by an incandescent bulb to produce light that has only 2 energy units: Reprinted with permission from "What you need to know about energy," 2008, by the National Academy of Sciences, Courtesy of the National Academies Press, Washington, D.C. Incandescent bulbs get hot because only 2/36 (about 5%) of the energy coming into the house to power the bulb comes out as light — the rest of the energy produces heat. If you trace the energy back to the power plant, it turns out a mere 2% of the energy from the coal is doing the desired lighting job! The power plant itself loses 62% of the coal’s energy! Compact fluorescents use about 5% of the coal’s energy — better, but not much. It’s important [...] Energy is measured in Joules (J) If you would like to quantitatively understand the relationship between your lifestyle, global energy use, and climate change, you need to establish the language with which you can translate between these things. If you would like to quantitatively understand the relationship between your lifestyle, global energy use, and climate change, you need to establish the language with which you can translate between these things. Today I’m doing a webcast for O’Reilly media on Energy and Energy Literacy. I’m making the slides available here: http://www.slideshare.net/energyliteracy/oreilly-energy-lieracy-webcast-092302009 I’m continually reminded of how difficult it is for people just go get past the difference between energy and power. To get a full picture of rate of energy use (power) we need to talk about both and their units, but it certainly makes it a cumbersome conversation to join afresh. Here’s a document from 1982, A Conceptual Framework for Energy Education, K-12, commissioned by the Department of Energy. On page 7 is a description of an “energy-literate citizen”: Understands that we can’t make energy. It contains the good the bad and the ugly of climate and energy books. Over time it will become more comprehensive and you’ll see loads of reviews coming up on the blog as I do an editorial on each of the books. For now just broswe the shelves: www.energyliteracy.com/deliciouslibrary And if you are a mac user, definitely try using delicious library as a management tool for your books. It’s fantastic. Disclaimer: the books in the library are under an amazon affiliates program that puts money towards: www.howtoons.com |
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