<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:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 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";
color:black;}
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;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;
color:black;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@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 bgcolor=white lang=EN-IE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear David,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thank you very much for your previous reply. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I am hoping you can clarify some of my confusions with this source code(Type941). I have studied this Type941 source code carefully. From my understanding is the outlet fluid temperature is not calculated from the amount of heat contained in the air. The Capacity and Power is worked out completely depending on the Rated Catalog Performance using the hourly ambient temperature and temperature of the fluid. So why does the relative humidity require at all? Is it only used to calculate the inlet and the outlet air properties which is not going to affect the fluid temperature in any way? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>As I understand from previous questions, the interpolation Rated Catalog Performance data could not be extrapolated from beyond the range provided? However, what would be the calculation (selection) if the inlet ambient temperature is 5oC and inlet water temperature is 27.5oC, how would the fraction capacity and power calculated out (decided)? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thank you very much for your kind answer.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Zhe Li<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> David BRADLEY [mailto:d.bradley@tess-inc.com] <br><b>Sent:</b> 19 April 2013 18:04<br><b>To:</b> TRNSYS users mailing list at the Solar Energy Lab, UW-Madison<br><b>Cc:</b> Zhe Li<br><b>Subject:</b> Re: [TRNSYS-users] Question about a line in Type941 source code<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Zhe,<br> lps_air is the volumetric flow rate of the air (in liters per second) and rho_air_dry_in is the density (in kg/m3) of the dry air at the heat pump inlet temperature.<br>Best,<br> David<br><br><o:p></o:p></p><div><p class=MsoNormal>On 4/19/2013 11:11, Zhe Li wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Dear All,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thank you for your time.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I am trying to understand how TRNSYS calculates power output from this air-water heat pumps (Type941).<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I am stuck in a line which I don’t know what the two terms are standing for? <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>! Determine the dry air mass flow rate<o:p></o:p></p><p class=MsoNormal>Flow_air = lps_air*3.6*rho_air_dry_in <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Could somebody let me know what are the <b>lps_air</b> and <b>rho_air_dry_in </b>standing for?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I hope I did not break TRNSYS source code rule by asking this question. <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thank you for your help in advance.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Zhe Li <o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br clear=all>Tá an teachtaireacht seo scanta ó thaobh ábhar agus víreas ag Seirbhís Scanta Ríomhphost de chuid Seirbhísí Faisnéise, ITBÁC agus meastar í a bheith slán. <a href="http://www.dit.ie">http://www.dit.ie</a><br>This message has been scanned for content and viruses by the DIT Information Services E-Mail Scanning Service, and is believed to be clean. <a href="http://www.dit.ie">http://www.dit.ie</a> <br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>TRNSYS-users mailing list<o:p></o:p></pre><pre><a href="mailto:TRNSYS-users@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a><o:p></o:p></pre><pre><a href="https://mailman.cae.wisc.edu/listinfo/trnsys-users">https://mailman.cae.wisc.edu/listinfo/trnsys-users</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br><br><o:p></o:p></span></p><pre>-- <o:p></o:p></pre><pre>***************************<o:p></o:p></pre><pre>David BRADLEY<o:p></o:p></pre><pre>Principal<o:p></o:p></pre><pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre><pre>22 North Carroll Street - suite 370<o:p></o:p></pre><pre>Madison, WI 53703 USA<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>P:+1.608.274.2577<o:p></o:p></pre><pre>F:+1.608.278.1475<o:p></o:p></pre><pre><a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre><a href="http://www.tess-inc.com">http://www.tess-inc.com</a><o:p></o:p></pre><pre><a href="http://www.trnsys.com">http://www.trnsys.com</a><o:p></o:p></pre></div><br clear=all> Tá an teachtaireacht seo scanta ó thaobh ábhar agus víreas ag Seirbhís Scanta Ríomhphost de chuid Seirbhísí Faisnéise, ITBÁC agus meastar í a bheith slán. <a href="http://www.dit.ie">http://www.dit.ie</a><br>
This message has been scanned for content and viruses by the DIT Information Services E-Mail Scanning Service, and is believed to be clean. <a href="http://www.dit.ie">http://www.dit.ie</a>
</body></html>