<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Aditi,</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">"The stagnation temperature is 200 C"</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Did you calculate that from the efficiency equation parameters that you entered into the model or is that just a general statement from your literature search?</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">You can calculate the stagnation temperature for your particular collector from your efficiency equation by setting the flow rate (and therefore the efficiency) to zero and solving for the temperature difference (collector to ambient) at the peak solar radiation. Then with any ambient temperature you know the collector stagnation temperature. Pay careful attention to the units.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Jeff - TESS<br><br>Sent from my iPhone</div><div><br>On Oct 31, 2017, at 12:40 AM, Aditi Garg 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><div dir="ltr"><div><div>Hello everyone,<br><br></div>I am using evacuated collector type 71. Generally in literature, it has been written that evacuated tube collectors can`t reach temperatures higher than stagnation temperature which is 200 degree Celsius.<br></div>But in doing simulation, it is reaching temperatures higher than 200 degree Celsius. <br><br>I will appreciate if anyone could help me solve this doubt.<br><br><div><div><div><div><div><div class="m_-2141560439315415377gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><span style="font-size:12.8px"><font color="#444444" face="arial, helvetica, sans-serif"><b><br></b></font></span></div><div><span style="font-size:12.8px"><font color="#999999" face="arial, helvetica, sans-serif"><b>Regards</b></font></span></div><div><font color="#999999"><b style="font-family:arial,helvetica,sans-serif;font-size:12.8px">Aditi Garg</b><br></font></div></div><div dir="ltr"><div style="font-size:12.8px"><div><font color="#999999"><b style="font-size:12.8px">PhD Research Scholar</b><br></font></div></div><div style="font-size:12.8px"><b><font color="#999999">Department of Mechanical Engineering<br></font></b></div><font color="#999999"><b style="font-size:12.8px">Indian Institute </b><b style="font-size:12.8px">of Technology, Delhi</b></font><span style="font-size:12.8px"><font color="#000000" face="arial, helvetica, sans-serif"><b><br></b></font></span><div><span style="color:rgb(153,153,153)"><span style="font-size:12.8px"><font face="arial, helvetica, sans-serif"><b>Hauz Khas,New Delhi-110016<br></b></font></span></span></div><div><span style="color:rgb(153,153,153)"><span style="font-size:12.8px"><font face="arial, helvetica, sans-serif"><b>India<br></b></font></span></span></div><div><span style="color:rgb(153,153,153)"><span style="font-size:12.8px"><font face="arial, helvetica, sans-serif"><b>Email ID: <a href="mailto:aditigarg107@gmail.com" target="_blank">aditigarg107@gmail.com</a><br><br><a href="https://in.linkedin.com/in/aditi-garg-ab083026?trk=profile-badge" target="_blank"></a><br></b></font></span></span></div></div><div dir="ltr"><br></div></div><div dir="ltr"><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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