RussellMc wrote: >>> I think it can be a matter of time a refrigeration unit would take >>> waste heat and even would freeze the output. >>> The collected heat would drive a small steam turbine. > > Q / Textus Receptus suggests that he is suggesting using waste heat to > drive a steam turbine and / or which would drive a refrigeration unit. Once again in your zeal to be the apologist for dumb comments, you have overlooked the most straight forward meaning. Perhaps this is a language problem, but poor grasp of thermodynamics is a much more likely explanation since it requires less contorting in the interpretation. You can't get power from waste heat and then "freeze the output". You can derive power from the difference in temperature of the exhaust and ambient. Doing so does cool the exhaust. However, it can't cool it (in aggregate) below ambient without additional power input. The point was to use the waste heat as power, so he obviously doesn't plan to use additional power and it would defeat the purpose anyway. Yes the collected heat could drive a heat engine, of which a steam engine i= s merely a particular type. Note that he thinks collecing the heat includes freezing the output. That's not how thermodynamics works. You could power a refrigerator from the waste heat and cool something, but that cooling power will be substantially less than the waste heat power. ******************************************************************** 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 .