efficiency
lborkowski | December 5, 2011by Mark Pendergrast
This is my third and final post about the state of Japan's renewable energy efforts and other measures that are vital to prevent further climate change and to wean the country from fossil fuel and nuclear power. In my first post, I covered the public-health impacts of climate change and explained why Japan is good indicator of whether countries will be able to act quickly enough in the face of these threats. Japan's reliance on imported fossil fuels gives it a good reason to invest in alternatives, and its technological sophistication should help it develop renewable-…
sastyk | April 26, 2011About a month ago I had the privilege of spending an hour talking (on stage, in front of an audience) to my congressman, Paul Tonko, about energy issues and preparedness. What emerged from this discussion was that *EVEN THOUGH* Tonko is one of the best congresspeople out there on energy and environmental issues, even though he's a tremendously smart guy, even though he actually has had some real education on peak oil issues, the two of us were talking past each other in many ways. It was fascinating - I know that Tonko grasps the basic idea, but the narrative in which efficiency,…
lborkowski | February 10, 2011Ta-Nehisi Coates at The Atlantic blogs: On Labor ("My son is the joy of my life. But the work of ushering him into the world nearly killed his mother.")
Scicurious at Neurotic Physiology: Dieting, Stress, and the Changing Brain.
Robert Reich's Blog at the Christian Science Monitor: US Chamber of Commerce: Obama makes a bargain
Jon R. Luoma at Yale Environment 360: Why Does Energy Efficiency's Promise Remain Unfulfilled?
Alice Bell at The Guardian's Notes & Theories blog: Sexual discrimination against women in science may be institutional -- and also one of the pieces she links to, Kathy…
stoat | July 29, 2010A friend pointed out just recently: we usually measure a car's fuel efficiency in Miles per Gallon. But some would like us to switch to the more logical Gallons per Mile (or 10,000 miles, to make the numbers more convenient, or whatever), which would be the fuel consumption. But that, technically, is an area, so for example a car which gets 55ish mpg actually has a fuel consumption of 0.051 mm^2 (ht: A/S).
sastyk | December 23, 2009I was just laboring over a post designed to explain the relationship between energy returned over energy invested and the importance of the *rate* of that return for our expectations about future resources, when I found out that Dr. Tom Konrad had already done this - yay! I think this is a useful and clear way of articulating the problems of future renewables. While I don't agree with all Konrad's conclusions as they are expressed (more on that in a second), I think he makes the relationship between EROEI and Rate of Return very clear and does so in a remarkably useful way. He writes:
The…
rallain | August 13, 2009What's the deal with the Chevy Volt? Well, obviously, it is a cool car. A plug-in hybrid. The problem is in how to quantify its efficiency. Normal hybrids (the non-plug in type) have only one type of energy input, gasoline. The Volt can take gasoline or electricity input. This makes it difficult to compare the efficiency of other cars. What is efficiency? There are several things you could calculate.
Actual MPG
This is the distance the car travels (the miles part) divided by how much gasoline it used (the gallons part). Pretty straight forward? Ah ha! Not so straight forward for…
rallain | April 11, 2009It is spring break, so we are at my parents house for a couple of days. The kids like it because there is a pool, a heated pool even. It really isn't that cold outside, but yesterday the water measured at 62 oF. So, with some help from the kids, we cleaned out the pool and turned on the heater. We also put a cover on it, hopefully to help it heat up some more.
This is perfect for a quick calculation. Is it reasonable that the pool could get up to a swimable temperature by tomorrow? Let me first make some assumptions and data:
15,000 gallons of water in the pool. This is about 57 m3.…
rallain | September 15, 2008There was this commercial on the radio about Trane heating and cooling units. The ad claimed that the units could use up to 50% less energy than your existing unit. This started me thinking (because before that I was in a complete state of non-thinking). Do you remember the Y2K problem? Basically, when people started writing programs back before Star Wars they had to be very conservative. The hardware of the time did not afford the programmers to have frivolous code. To conserve, they only used the last two digits to represent the year (1970 was represented as 70). Obviously this…