<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Use a few simple equations in the calculator component. Let's call the thermostat signal for the DHW tank Y_DHW and the thermostat signal for the buffer tank Y_BUFFER. One of the signals has to be one and the other zero at all times. So we then have the signals for the diverting valve as:</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Y_Diverter_1 = Y_DHW</div><div id="AppleMailSignature">Y_Diverter_2 = 1-Y_DHW</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">And the pump signal would be:</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Y_PUMP = MAX(Y_DHW , Y_BUFFER)</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Jeff - TESS</div><div id="AppleMailSignature"><br>Sent from my iPhone</div><div><br>On Jul 1, 2017, at 11:53 AM, Dashamir Marini via TRNSYS-users <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<p class="MsoNormal">Dear TRNSYS user,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I’m trying to model an heat pump system that should charge a DHW and a buffer tank (please see the diagram below).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The idea is that heat pump always first (when there is demand) should charge the DHW tank and later the buffer tank for space heating.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">How I can build a logic expression like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Let say that I have two signals coming from tank 1 and tank2 .<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The logic control should be: <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> if the signal from tank1 = 1 (tank1 temp < t setpoint) then the diver valve (Type647) circulate all water flow at tank1;
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">if the signal from tank1 =0 and signal from tank2 =1 ((tank2 temp < t setpoint) then the divert valve circulate all water flow at tank2;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">so the logic is that heat pump through diverting valve Type 647 first should charge the DHW tank (tank534 coiled 2 ) and after if there is no need to charge DHW tank then the divert valve should sent all water
flow rate to the buffer tank Type534.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">How it can be developed that control logic in TRNSYS?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thank you in advance<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">D Marini<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><image001.jpg><o:p></o:p></p>
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