I found these were quite good overview articles:<p><a href="http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;06&#x2F;thermal-efficiency-cooking-stoves.html" rel="nofollow">http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;06&#x2F;thermal-efficiency-co...</a><p><a href="http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;07&#x2F;cooking-pot-insulation-key-to-sustainable-cooking.html" rel="nofollow">http:&#x2F;&#x2F;www.lowtechmagazine.com&#x2F;2014&#x2F;07&#x2F;cooking-pot-insulatio...</a>