I just came across an interesting item describing the three most common types of coolant for solar hot water systems and some of their properties. The article seems to be written by the manufacturer so there may be a bit of bias, but it does highlight the issues inherent in coolant selection. It is short and easy to read.
I follow the folks that write Japan Safety: Nuclear Energy Updates and they just posted an article from the Japan Times where they look at the current government’s plans for energy sustainability over the next few decades. The picture is disturbing in light of the disaster at Fukushima in 2011.
Nuclear energy is carbon neutral, but it brings so many other long-term risks into the picture that it should not be considered as a sustainable energy source. At Fukushima, they are having to store huge amounts of contaminated water on a site that was completely inundated with ocean water in 2011.
Read the article here.
John [jpratt27] has published an excellent summary of a new plan to develop a new solar-powered greenhouse in South Australia. This plant will not only produce fresh vegetables but will also be used to desalinate water in a very arid region. A few more details are needed about how the resulting salts will be dealt with, but the project looks very hopeful.