Live data from Hacker News

"Sustainable Energy - Without the Hot Air" by David JC MacKay

withouthotair.com

31–34 of 34 posts

Re: "Sustainable Energy - Without the Hot Air" by David JC MacKay

#31
Extremely smart book. Read most way through his draft version a few months ago. Ordered it in paperback, looking forward to rereading the final copy.

Seems pretty up the middle as he tends to attack all sides who spout off bullshit numbers. However, there's going to be a lot of political hate for this book. Oh well, that's the world we live in. Truth and pure data analysis is very under appreciated in todays hyper partisan political environment.

Re: "Sustainable Energy - Without the Hot Air" by David JC MacKay

#32
post #24

Earlier quoted context omitted.

Also, shower shorter. 5 minutes is way more than enough.

Your average guy maybe, but I doubt you'll get too many women or teenage girls to shower inside of 5 minutes, especially if they have long hair. However a shower longer than 10 minutes might as well be a bath as your average tub only needs 60 gals to fill and your average shower pumps out 50 gals in 10 minutes. So if you take your time showering, you might as well take even longer and have a good bath instead. After…

Baths don't seem to make much sense: you're soaking in the very filth you're trying to clean off of yourself, and after you're done, you're still soapy so you need to rinse off anyway. It also takes time to draw the bath, time that you would otherwise be washing yourself.

When I was young though, I would close the drain, shower, and then take a bath once the bathtub was full.

Re: "Sustainable Energy - Without the Hot Air" by David JC MacKay

#34
post #10

Earlier quoted context omitted.

Perhaps "like" is too strong a word, but it's rather bracing to get an idea of how long high-energy civilization can last; barring some miracle like practical, cheap fusion power appearing in the next decade. If I were to make a comparison to a work of fiction, it wouldn't be to Mad Max or The Day After Tomorrow ; but to The Cold Equations , by Tom Godwin.

Nuclear can prolong us for a long time, uranium would basically be a stop gap to full on conversion to thorium reactors, as it's 3 times more abundant than uranium, but 550 times more abundant than U-235. Basically nuclear would only be a stopgap to Fusion. Once fusion becomes available, you can begin replacing fission with fusion. Existing nuclear power plants have so much land reserved around them as a buffer zone…

1. ITER (and NIF) may turn out to be irrelevant: http://www.technologyreview.com/business/23102/

2. It's been a while, but IIRC we're looking at at least 50 more years of U-235 and maybe two centuries of plutonium and thorium (lowballing). I have a hard time believing that there won't be even one revolutionary breakthrough in how we use or generate energy in the next 150-250 years.

Post reply on HN