{"action":"created","issue":{"url":"https://api.github.com/repos/CoolProp/CoolProp/issues/693","labels_url":"https://api.github.com/repos/CoolProp/CoolProp/issues/693/labels{/name}","comments_url":"https://api.github.com/repos/CoolProp/CoolProp/issues/693/comments","events_url":"https://api.github.com/repos/CoolProp/CoolProp/issues/693/events","html_url":"https://github.com/CoolProp/CoolProp/issues/693","id":86890421,"number":693,"title":"Adding CV, Internal Energy , Speed of Sound and Isotropic Exponent to HAPropsSI Wish List, Ref #503","user":{"login":"TimHarvey2","id":11156125,"avatar_url":"https://avatars.githubusercontent.com/u/11156125?v=3","gravatar_id":"","url":"https://api.github.com/users/TimHarvey2","html_url":"https://github.com/TimHarvey2","followers_url":"https://api.github.com/users/TimHarvey2/followers","following_url":"https://api.github.com/users/TimHarvey2/following{/other_user}","gists_url":"https://api.github.com/users/TimHarvey2/gists{/gist_id}","starred_url":"https://api.github.com/users/TimHarvey2/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/TimHarvey2/subscriptions","organizations_url":"https://api.github.com/users/TimHarvey2/orgs","repos_url":"https://api.github.com/users/TimHarvey2/repos","events_url":"https://api.github.com/users/TimHarvey2/events{/privacy}","received_events_url":"https://api.github.com/users/TimHarvey2/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/CoolProp/CoolProp/milestones/12","html_url":"https://github.com/CoolProp/CoolProp/milestones/v5.1.2","labels_url":"https://api.github.com/repos/CoolProp/CoolProp/milestones/12/labels","id":1204763,"number":12,"title":"v5.1.2","description":null,"creator":{"login":"jowr","id":769593,"avatar_url":"https://avatars.githubusercontent.com/u/769593?v=3","gravatar_id":"","url":"https://api.github.com/users/jowr","html_url":"https://github.com/jowr","followers_url":"https://api.github.com/users/jowr/followers","following_url":"https://api.github.com/users/jowr/following{/other_user}","gists_url":"https://api.github.com/users/jowr/gists{/gist_id}","starred_url":"https://api.github.com/users/jowr/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jowr/subscriptions","organizations_url":"https://api.github.com/users/jowr/orgs","repos_url":"https://api.github.com/users/jowr/repos","events_url":"https://api.github.com/users/jowr/events{/privacy}","received_events_url":"https://api.github.com/users/jowr/received_events","type":"User","site_admin":false},"open_issues":8,"closed_issues":17,"state":"open","created_at":"2015-07-13T09:10:51Z","updated_at":"2015-07-28T04:51:53Z","due_on":null,"closed_at":null},"comments":19,"created_at":"2015-06-10T08:38:07Z","updated_at":"2015-07-29T01:42:14Z","closed_at":null,"body":"I looking at formulas in Section 5.3 of \"Herrmann, S.; Kretzschmar, H.-J.; Teske, V.; Vogel, E.; Ulbig, P.; Span, R.; Gatley, D.P.: Determination of Thermodynamic and Transport Properties for Humid Air\r\nfor Power-Cycle Calculations. PTB-Verlag, Braunschweig (2009).\r\nI was able to calculate CV and \"CP\" with good correlation to LibHAirProps-SI and Refprop See below I am trying to get the others to work But Speed of Sound is a bit more complex.Do you think this is a suitable method or do I have to go back to derivatives. I like these methods as they enable other gas mixes to be used provided Moisture content can be calculated (that's future wish list Item the Enhancement factor for gas mixes other than AIr (there are some paper by David C. Shallcross that attempt this but maybe better methods now?))\r\n![cv humid air usings propssi](https://cloud.githubusercontent.com/assets/11156125/8078256/bdb7e758-0f9f-11e5-95ff-eacba6f8a3ee.JPG)\r\nI hope attache Image come through I migh Emai in case\r\n"},"comment":{"url":"https://api.github.com/repos/CoolProp/CoolProp/issues/comments/125801717","html_url":"https://github.com/CoolProp/CoolProp/issues/693#issuecomment-125801717","issue_url":"https://api.github.com/repos/CoolProp/CoolProp/issues/693","id":125801717,"user":{"login":"ibell","id":1859947,"avatar_url":"https://avatars.githubusercontent.com/u/1859947?v=3","gravatar_id":"","url":"https://api.github.com/users/ibell","html_url":"https://github.com/ibell","followers_url":"https://api.github.com/users/ibell/followers","following_url":"https://api.github.com/users/ibell/following{/other_user}","gists_url":"https://api.github.com/users/ibell/gists{/gist_id}","starred_url":"https://api.github.com/users/ibell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ibell/subscriptions","organizations_url":"https://api.github.com/users/ibell/orgs","repos_url":"https://api.github.com/users/ibell/repos","events_url":"https://api.github.com/users/ibell/events{/privacy}","received_events_url":"https://api.github.com/users/ibell/received_events","type":"User","site_admin":false},"created_at":"2015-07-29T01:42:14Z","updated_at":"2015-07-29T01:42:14Z","body":"Well, I have to actually implement these things, but it seems like its\npretty straightforward actually.  We shall see.  Thanks for the email.\n\nOn Tue, Jul 28, 2015 at 1:57 AM, TimHarvey2 <notifications@github.com>\nwrote:\n\n> Ok I have sent email Thanks I guess this closes this issue.\n>\n> —\n> Reply to this email directly or view it on GitHub\n> <https://github.com/CoolProp/CoolProp/issues/693#issuecomment-125490041>.\n>\n"}}