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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear trnsys users,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I would like to simulate a SDHW System in which a 4 way valve is used to discharge the <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>store (Type 340) with a fixed mixing temperature from 3 temperature zones.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’ve attached a project file I’ve used to test the controller. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’ve tried to use two flow diverter and two tee pieces to realize the system.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Double Port 3 is placed in the top of the storage<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Double Port 2 between top and middle of the storage<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Double Port 1 in the middle of the storage <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Flow diverter 1 outlet flow rate 1 is connected to Double Port 1<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Flow diverter 1 outlet flow rate 2 is connected to flow diverter 2 Inlet flow rate<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Flow diverter 2 outlet flow rate 1 is connected to Double Port 2<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Flow diverter 2 outlet flow rate 2 is connected to Double Port 3 <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>(in the complete system the temperatures are also connected, but in the attached file<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have no system between Flow diverter and mixers… and the input temperatures to the<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>tee pieces have fixed values to simulate an example for storage temperatures) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The double ports outlet flow rates and temperatures are connected to two tee pieces <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Tee Piece 1 inlet temperature 1 and flow rate 1 is connected to Double Port 2<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Tee Piece 1 inlet temperature 2 and flow rate 2 is connected to Double Port 3<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Tee Piece 2 inlet temperature 1 and flow rate 1 is connected to Double Port 1<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Tee Piece 2 inlet temperature 2 and flow rate 2 is connected to outlet temperature and outlet flow<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>rate of tee piece 1<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>In the attached file the outlets of the flow diverters are connected to the inlets of the tee pieces.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’ve tried to control the outlet flow rates from the flow diverters with iterative feedback controllers<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>to reach the set point temperature as mixing temperature of tee piece 1 and 2.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The first flow diverter is controlled by an iterative feedback controller monitoring the<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>outlet temperature of tee piece 2 (setpoint 40°C)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>the second flow diverter is controlled by a second iterative feedback controller monitoring<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>the outlet temperature of tee piece 1 (setpoint also 40°C)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>the inlet flow rate of flow diverter 1 is fixed<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>inlet temperature 1 of tee piece 1 is 50°C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>inlet temperature 2 of tee piece 1 is 70°C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>inlet temperature 1 of tee piece 1 is 30°C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>To reach the setpoint the control function of flow diverter 1 has to be zero and <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>the control function of flow diverter 2 has to be 0.5.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The first iterative feedback controller works fine, control function is set to zero, but the second iterative <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Feedback controller doesn’t work, but I don’t know why.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I hope someone can help me or can tell me an easier way to realize the system.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Danny <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>