<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.5pt;
font-family:Consolas;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:Consolas;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Hi there<o:p></o:p></span></p><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Yes it is standard practise to input the weighted average thermal properties when you have different layers.<o:p></o:p></span></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>François Badinier<o:p></o:p></p><p class=MsoNormal><span style='color:#C0504D'>Development Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='color:#00B050'>ICAX Ltd<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;color:#00B050'>1 Berry Street <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;color:#00B050'>London EC1M 5PS<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New";color:black'><a href="mailto:francois.badinier@icax.co.uk"><span style='color:blue'>francois.badinier@icax.co.uk</span></a><o:p></o:p></span></p><p class=MsoNormal><span lang=FR style='font-size:8.0pt;font-family:"Courier New";color:black'><a href="http://www.icax.co.uk/"><span lang=EN-GB style='color:blue'>www.icax.co.uk</span></a></span><span style='font-size:8.0pt;font-family:"Courier New";color:black'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><span lang=EN-US>-----Original Message-----<br>From: a8304506@graduate.hku.hk [mailto:a8304506@graduate.hku.hk] <br>Sent: 10 December 2010 11:53<br>To: Trnsys discussion group<br>Subject: [TRNSYS-users] Parameters for Type557a</span></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Hello, everyone.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I try to use Type557a to simulate the performance of borehole ground heat exchangers in a multi-layer ground. However, I don't know what values I should use for the store thermal conductivity and volumetric heat capacity (Parameters<o:p></o:p></p><p class=MsoPlainText>9 & 10). Should I input the average values of all the ground layers? It seems that these two parameters influence the outlet fluid temperature substantially.<o:p></o:p></p><p class=MsoPlainText> Please advise. Thank you!<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Best Regards<o:p></o:p></p><p class=MsoPlainText>LEE, Chun Kwong<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p></div></body></html>