Has anyone modeled a carbon dioxide (R744) heat pump or refrigeration system? Please let me know if you have performance data that you are willing to share (such as for Type919 or Type927). Although commercial products are available (mostly in Europe and Asia) I have not been able to find any manufacturer data for CO2 equipment. Thanks, Ben Heymer, Energy Engineer Energy Center of Wisconsin | Madison.Chicago.Minneapolis 608.210.7168 | Mobile: 312.315.4783 | www.ecw.org |