A high efficiency absorption heat pump cycle is disclosed using a high pressure stage, a supercritical cooling stage, and a mechanical energy extraction stage to provide a non-toxic combined heat, cooling, and energy system. Using the preferred carbon dioxide gas with partially miscible absorber fluids,...http://www.google.com.au/patents/US7313926?utm_source=gb-gplus-sharePatent US7313926 - High efficiency absorption heat pump and methods of use
