<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>TRNSYS does not extrapolate beyond the edges of the provided data. There is actually a notice written to the list file showing how many times the inputs were above or below the limits in the data file.</div><div><br></div><div>Jeff Thornton </div><div>TESS<br><br>Sent from my iPhone</div><div><br>On Sep 7, 2014, at 8:11 AM, metkell yebiyo <<a href="mailto:metkell@yahoo.com">metkell@yahoo.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:10pt"><div class="" style="">Dear Trnsys Users,</div><div class="" style=""><br class="" style=""></div><div style="color: rgb(0, 0, 0); font-size: 13.63636302947998px; font-family: 'Courier New', courier, monaco, monospace, sans-serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; font-family: 'Times New Roman', serif;" class="">I understand due to the nature of the interpolation
method the associated thermal outputs and COPs of a particular heat pump are
interpolated over a temperature field, as the inlet and outlet temperatures
vary during the operation of the heat pump. </span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; font-family: 'Times New Roman', serif;" class=""><br class="" style=""></span></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; font-family: 'Times New Roman', serif;" class="">Now my question is how does Trnsys deal with extraplation, in other wards how does Trnsys calculate the COP </span><span style="line-height: 18.399999618530273px;" class=""> </span><span style="line-height: 18.399999618530273px;" class="">values</span><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class=""> if the inlet and outlet </span><span style="line-height: 18.399999618530273px;" class=""> </span><span style="line-height: 18.399999618530273px;" class="">temperature </span><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class="">are outside the given range of the manufacturer data. Lets say if the inlet and outlet temperature ranges of the heat pump is between 0deg C and 40deg C but the system is given you a temperature of 45 deg C. Then how does Trnsys calculate the value of the COP at this new temperature?</span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class=""><br class="" style=""></span></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: 'Times New
Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class=""><br class="" style=""></span></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class="">Regards,</span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class="">Metkel</span></div><div style="color: rgb(0, 0, 0); font-size: 12pt; font-family: 'Times New Roman', serif; font-style: normal; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class=""><br class="" style=""></span></div><div class="" style="">Metkel Yebiyo BEng (Hons), MSc<o:p class="" style=""></o:p></div><div class="" style="">CEREB PhD Researcher - Ground Source Heat Pumps <o:p class="" style=""></o:p></div><div class="" style="">Room T615 <o:p class="" style=""></o:p></div><div class="" style="">Department of Urban Engineering <o:p class="" style=""></o:p></div><div class="" style="">Faculty of Engineering, Science and the Built Environment<o:p class="" style=""></o:p></div><div class="" style="">London South Bank University, <o:p class="" style=""></o:p></div><div class="" style="">103 Borough Road,<o:p class="" style=""></o:p></div><div class="" style="">London SE1 0AA<o:p class="" style=""></o:p></div><div class="" style="">Tel: +44 (0)20 7815 7639<o:p class="" style=""></o:p></div><div style="font-size: 16.363636016845703px; font-family: 'Times New Roman', serif; background-color: transparent;" class=""><span style="font-size: 12pt; line-height: 115%; background-color: transparent;" class="">
</span></div><div class="" style="">E: <a href="mailto:yebiyom@lsbu.ac.uk" class="" style="">yebiyom@lsbu.ac.uk</a><o:p class="" style=""></o:p></div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>TRNSYS-users mailing list</span><br><span><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a></span><br><span><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a></span><br></div></blockquote></body></html>