This is a companion volume the book mention by Ted (
http://www.navitron.org.uk/forum/index.php/topic,4800.0.html) and is also an OU T206 course book. You can read the index on Amazon.
Quite a useful book as it covers a wide range of topics including basic information on how some things "work", for example, the Stirling engine. You also get a bit of a history lesson on each topic which often puts things into perspective (how did we get here?). There is also a basic introduction to thermodynamics for those who have not explored this before. Very few equations to frightened the non engineer/scientist.
Some of the data are a bit dated as the book was published in 2003. For example the economics section, "Costing Energy", shows heating oil at about 1p/kWh (about 10p/litre - ha ha!). However it gives you the basis to work things out for yourself using current data.
I have it in my library and maybe worth having in yours.
Simon