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<p><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Hi Benjamin,</span><br>
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<p>TRNSYS is primarily a thermal analysis tool; the simulation does not automatically perform a hydraulic analysis as well, which is what you are asking for. (Although there are components to do this.)</p>
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<p>If you review the TRNSYS documentation for the pump, you'll see the mass flow rate is set to the maximum mass flow rate when the control signal is 1. The power consumption is set by a polynomial in terms of the control signal, that you define with the power
conversion coefficients. Since the power and mass flow rate are linked by the control signal, this allows you to define a power curve if you're operating at a range of mass flow rates. You must specify the power coefficients for your particular system. </p>
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<p>If the system changes, i.e. you add another panel, you have increased the pressure drop for the pump to overcome, which will change the operating point of the pump (mass flow rate and pressure head). To calculate this new operation point, you need to know
the pressure-flow rate characteristics of the pump, and the overall pressure loss in your hydraulic circuit (collector, valves, pipes, bends etc), and find the intersection of these. The power consumption is the mass flow rate multiplied by the pump pressure.</p>
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<div><span style="font-size:10pt">Kind regards,</span></div>
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<div><span style="font-size:10pt"><b>Alastair McDowell</b></span></div>
<div><span style="font-size:10pt">Engineering Consultant</span><br>
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<div><span style="font-size:10pt"><strong>Energy Analysis & Engineering</strong> – Enabling innovation for a sustainable future</span></div>
<div><span style="font-size:10pt">T: +61 450 600 842</span></div>
<div><span style="font-size:10pt">E: alastair.mcdowell@energyae.com</span></div>
<div><span style="font-size:10pt">608 Harris St Sydney NSW 2007 Australia | </span><span style="font-size:10pt"><a href="http://www.energyae.com/" target="_blank" id="LPNoLP" title="http://www.energyae.com/
Ctrl+Click or tap to follow the link">http://www.energyae.com</a></span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> on behalf of Benjamin Stobbe <benjamin_stobbe@hotmail.com><br>
<b>Sent:</b> Sunday, 15 November 2015 12:52 AM<br>
<b>To:</b> 'TRNSYS users mailing list at OneBuilding.org'<br>
<b>Subject:</b> [TRNSYS-users] Working of the pump type 3</font>
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Dear people,</p>
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<span lang="EN-US">Still busy with my hybrid solar panel system on the side of facade and I’m now looking into the pump. My small system has now 4 panels connected to one pump and I was looking how the power consumption increased as function of connecting more
panels to the pump, but the power does not increase, according to the model because this only takes into account the output flow and this is 90l/h only 4 or 5 times. You see in the input that it asks from the tank 360 o4 450l/h. Does someone have an idea to
solve this, because I now believe the power consumption is not realistic. Or is the idea of scaling up not consuming more power of a pump?
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<span lang="EN-US">Best regards,</span></p>
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<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif">
<span lang="EN-US">Benjamin Stobbe</span></p>
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