No - there is no way in the current TRNSYS library to model the collector or pipes to model the drainback situation where air replaces water. That being said, you could create a simulation where the water in the collector and pipes is "thrown away" when the pump starts up each morning until enough time has passed where water would again be filling the system. In that way you wouldn't be penalized for the thermal losses from the fluid to the ambient overnight. While it's not technically perfect, it does replicate to some extent what you are trying to do.
Jeff
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Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
On 10/19/2013 9:35 am, Malak Dakhli wrote:
Hi,I am modelling a drainback SDWH with TRNSYS 17 but in such system while it's working there is water in the collectors and when it stops the water drains to the tank and air replaces water in the collectors.My question; is there a way how to define these two fluids in the collectors?Best regards
Malak Dakhli, ing., M.Sc. Chercheuse / Researcher
Chaire de recherche industrielle en technologies de l'énergie et en efficacité énergétique (T3E) /
Industrial research chair in technologies of energy and energy efficiency (T3E)
École de technologie supérieure,1100 Notre-Dame Ouest, Montreal, Qc, Canada, H3C 1K3
+1 514 559-3889 | malak.dakhli@gmail.com | malak@t3e.info | www.t3e.infoLa Ville de Lévis, la Conférence Régionale des Élus de Chaudière-Appalaches, Énergie Valero Inc. et Ecosystem, partenaires et piliers de t3e : merci