Jeff Thank you for replying. I have identified the problem. It was the pump heat loss to the fluid stream which accounted for the difference between the output from the collector and my calculations. A typical newbie mistake I guess. Best regards Richard Thygesen Från: Jeff Thornton [mailto:thornton@tess-inc.com] Richard, I just dragged out Type 539, connected it to a TMY-3 weather file and ran it for a month. The results from the model exactly match the results from the Qu=Mdot*Cp*(Tout-Tin) equation to the 12th decimal. Check to make sure you have the same specific heat in both, have the correct connections etc. If you are still running into issues then send the project to your distributor for a closer look. Jeff --- Jeff Thornton President - TESS LLC 22 N. Carroll Street, Madison WI USA 53703 Office: (608) 274-2577 Fax: (608) 278-1475 E-Mail: thornton@tess-inc.com On 07/31/2012 8:33 am, Richard Thygesen wrote:
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