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Nidal, There are a couple of things you need to be a little bit cautious about in this. First, Type539 only accounts for sensible heating and cooling. The assumption is that the absolute humidity ratio of the air entering and leaving the collector is the same. During daytime, this is likely not a problem but because the temperature changes through the collector, you'll need to put a Type33 at the outlet in order to correctly recalculate the outlet air relative humidity. Second, Type539 does not take into account longwave radiation loss that typically happens at night. Your working fluid will only cool down to ambient, not below it. While this is true for both water and air based collectors, the impact is a little more important for air-based collectors because, as I mentioned in the first caution, the Type only handles sensible energy so while in real life you might get some condensation occurring inside the collector at night, this effect will not be seen in the model. Best, David On 10/26/2012 17:33, Nidal Abdalla
wrote:
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |