<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><div style="min-height:22px;margin-bottom:8px;">Thanks, Toni.</div><div style="min-height:22px;margin-bottom:8px;"><br></div><div style="min-height:22px;margin-bottom:8px;">I will carefully check my windows’ configuration and set ground temperature in another way to see if there any improvements.</div><div style="min-height:22px;margin-bottom:8px;"><br></div><div style="min-height:22px;margin-bottom:8px;">Regards,</div><div style="min-height:22px;margin-bottom:8px;">Zhichen </div><div style="min-height:22px;margin-bottom:8px;"><br></div><div id="QQMailSignature" class="mail-footer" aria-hidden="true"><hr style="margin: 0 0 10px 0;border: 0;border-bottom:1px solid #E6E8EB;height:0;line-height:0;font-size:0;padding: 20px 0 0 0;width: 50px;">发自我的iPhone</div><div id="original-content"><br><br><div class="xm_mail_oringinal_describe"><div style="font-size:70%;padding:2px 0;">------------------ Original ------------------</div><div style="font-size:70%;background:#f0f0f0;color:#212121;padding:8px;border-radius:4px"><div><b>From:</b> Toni Calabrese via TRNSYS-users <trnsys-users@lists.onebuilding.org></div><div><b>Date:</b> Thu,Jul 15,2021 1:51 PM</div><div><b>To:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org></div><div><b>Cc:</b> Toni Calabrese <toni.calabrese@ost.ch></div><div><b>Subject:</b> Re: [TRNSYS-users] indoor temperature is unstable</div></div></div><br>
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<p class="MsoNormal">Hi Zhichen,<o:p></o:p></p>
<p class="MsoNormal">I think that two are the crytical point that you should check and they are:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]-->1.
<!--[endif]-->Influence of the window. In your experimental room there is a window if I am not wrong. Did you check in your
model if all the parameters of the window (g value, U value, shading control) are implemented correctly?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]-->2.
<!--[endif]-->As I understand in your model, you set the ground temperature to 5°C, correct? Why did you implemented like this?
I think that the real ground temperature under the room is pretty different and follows the behavior of the outside temperature in terms of annual oscillations and not a constant value….<o:p></o:p></p>
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<p class="MsoNormal">Are my comments useful or did I not understand what/how you implemented everything in your model?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> TRNSYS-users
<trnsys-users-bounces@lists.onebuilding.org> <b>On Behalf Of </b>??? via TRNSYS-users<br>
<b>Sent:</b> Thursday, July 15, 2021 5:32 AM<br>
<b>To:</b> trnsys-users <trnsys-users@lists.onebuilding.org><br>
<b>Cc:</b> 大大宝 <805520662@qq.com><br>
<b>Subject:</b> [TRNSYS-users] indoor temperature is unstable<o:p></o:p></p>
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<p class="MsoNormal">Dear TRNSYS users, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am validating my model with a experimental room (room). The room has a floor heating system and I simulated the indoor temperature in the case of floor heating turning off. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I input the collected weather data(weather1.txt) into the simulation (room.b18 & room.tpf). <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I compared my simulated indoor temperature with the measured one. I found that the simulated indoor temperature is unstable when the measured temperatures fluctuate similarly for each day (indoor temperature.png). I just don't known what
would contribute to this mismatch when they shared the same weather condition. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Have anyone faced this problem before? any ideas to figure out this mismatch?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I will very appreciate for any helps!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal">Zhichen <o:p></o:p></p>
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