RussellMc wrote: >>> a refrigeration unit would take >>> waste heat and even would freeze the output. > > As I read it this says, apparently clearly, that waste heat could > provide refrigeration and that the cold end may even be able to be > below ) Celsius. No, he said "the output", meaning the exhaust stream of the car. You can't use a heat engine to cool its hot input to below its cold input. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .