<HTML dir=ltr><HEAD> <META http-equiv=Content-Type content="text/html; charset=unicode"> <META content="MSHTML 6.00.6000.16608" name=GENERATOR></HEAD> <BODY> <DIV><FONT face=Arial color=#000000 size=2>Dear ESRU,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I have generated a simple model of a 1 storey, 1 zoned building. The zone geometry, construction and operation details are all set. I have also set a zone control with a basic controller with 3 control periods for a weekday and 1 for Saturday and Sunday. On the Sunday I have set the control to 'free float'.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>When I run the simulation it completes very quickly - suggesting its not doing much. Looking at the results no heating load is associated with the zone and the zone temperature value is 'nan'. As far as I can tell I have set everything up correctly. I've checked the .ctl file is being picked up (by running the simulation interactively) and I have compared files against a different model that is working and can't see any obvious differences (i.e. omitted data).</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>If anyone has an idea what might be causing this, or if there are a list of steps I should follow to ensure the model's validity I would be grateful for the advice.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>If of any relevance, I'm using Mac OSX.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Many thanks</FONT> </DIV></BODY><br/> <p> This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. </p> </HTML>