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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>1 – use type23 and airlink outputs to control the air flow rate.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>2 – a straight duct does not generate air flow itself. Therefore its not an input and results from the pressure conditions in the network.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>3 – this is very complex, because the flow controller does not perform this function and the distribution results according to the pressure losses. A simple solution is to work with two decentralized fans and to control them (see 1.).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b>Von:</b> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> <b>Im Auftrag von </b>ali shahrouzian via TRNSYS-users<br><b>Gesendet:</b> Donnerstag, 24. November 2022 17:09<br><b>An:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org><br><b>Cc:</b> ali shahrouzian <ali.shahrouz@gmail.com><br><b>Betreff:</b> [TRNSYS-users] TRNFlow_ Fan_ Diverging and Converging tees<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Dear all TRNSYS users,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I am modeling a forced air furnace system to satisfy heating demands of a residential building. To<span style='font-family:"Arial",sans-serif;color:#4D5156'> simulate the building's thermal load and consider the effects of air transfer between thermal zones, I've used Type 56-TRNFlow.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:#4D5156'> As you know, when</span> TRNFLOW is turned on, in the simulation the defined infiltrations, ventilations and couplings will be replaced with the defined TRNFLOW data. Thus, in TRNFlow, I must define a fan, a heating coil, and a ducting system in order to model the forced air furnace system.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>However, I am having some trouble modeling a fan and fittings (Tee).<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>1- In TRNFlow, how can I control the value of a fan's air flow rate? My goal is to have the air blown into the building by a supply fan at a constant and certain rate. It seems that due to changes in pressure differences between auxiliary nodes, the air flow rate of the fan cannot remain constant either.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>2- How can I input the value of the flow rate of a "straight duct" in TRNFlow? It seems that I can only input the values of the friction loss and the dynamic loss.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>3- How can I model a diverging tee or a converging tee as an air link in TRNFlow. For example, as for diverging tee, if I want to send 30% of the flow rate in the main duct to the first branch and the rest to the second branch, how can I do this?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I would appreciate it if anyone helps me in these cases.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best,<o:p></o:p></p></div><div><p class=MsoNormal>Ali<o:p></o:p></p></div><div><div><div><div><div><div><div><div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></div></div></div></div></div></div></body></html>