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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Phil, what you’re describing as an expression that reads in an hourly variable is I believe what my predecessors in doe2 history would coin as an Input Function. Not something
we can do in doe 2.2+ (presently), but it comes up from time to time as something some would like to see resurface and become a feature accessible through the eQUEST interface. Further reading and examples of functions are available in your help file (doe2
reference manual) under the entry <u>Volume 3: Topics > Building Description Language > Input Functions</u>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Short of rolling back and doing your project with such an Input Function in 2.1e, I don’t think there is a way to accomplish this for PVVT.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">VAVS and PVAVS systems have the option of using HMAX-FLOW-RATIO to define heating mode supply air ratios at a central/zonal level, but since PVAVS is distinct from PVVT in
not really being able to supply heated air from the central unit based on heating/cooling mode as PVVT is designed, I don’t think you want to switch system types.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">And just to be sure, I checked and confirmed that HMAX-FLOW-RATIO has zero impact on PVVT systems with a dummy model.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Phil Jordan via Equest-users<br>
<b>Sent:</b> Wednesday, August 23, 2017 2:02 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span style="font-family:"Calibri",sans-serif;color:black">Thanks, Bill.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">How about, for PVVT, is it possible to set a unique supply flow per cooling (or heating) stage? Could the hourly value of the COOL-STAGE keyword be used in a BDL expression to dictate SUPPLY-FLOW?<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Phil <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Bishop, Bill <<a href="mailto:bbishop@pathfinder-ea.com">bbishop@pathfinder-ea.com</a>><br>
<b>Sent:</b> Wednesday, August 16, 2017 1:50 PM<br>
<b>To:</b> Phil Jordan<br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?</span><span style="font-family:"Calibri",sans-serif;color:black">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"> <o:p></o:p></span></p>
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<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Phil,</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">No, not exactly. But you can specify different system MIN-FLOW-RATIOs for cooling mode and heating mode.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">For your example, you can set HMIN-FLOW-RATIO to 550/800 = 0.6875.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">You would also need to change the FAN-CONTROL to something other than CONSTANT-VOLUME for PSZ systems.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">For VAVS and PVAVS systems, you also have the option of specifying an HMAX-FLOW-RATIO, but not greater than 1.0.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">You can change these values at the zone level as well.</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill</span><span style="color:black"><o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP</span></b><span style="color:black"><o:p></o:p></span></p>
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<p><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Phil Jordan via Equest-users<br>
<b>Sent:</b> Wednesday, August 16, 2017 4:32 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?</span><span style="color:black"><o:p></o:p></span></p>
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<p><span style="color:black"> <o:p></o:p></span></p>
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<p><span style="font-family:"Calibri",sans-serif;color:black">With a PSZ or PVVT system type in eQUEST, is it possible to define a different supply airflow in heating vs cooling mode (ex. 800 CFM in cooling mode; 550 CFM in heating mode)? If so, how can this
be done? Thanks!<o:p></o:p></span></p>
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