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<body class='hmmessage'><div dir='ltr'><h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">Dear Alastair,<o:p></o:p></span></h1>
<h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">Thank you for your patient reply. Now I can understand the relationship
between the coefficients and the parameters. And, I tried to understood the
Fortran code although my poor knowledge about it.<o:p></o:p></span></h1>
<h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">But it sees that the pump’s power drawn result is not right according to
the setting as the following, Which is much lower than the equation curve I have
attached the simple project(.tpf and.txt file) and the fitting equation(.xls)
data file. <o:p></o:p></span></h1>
<h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold"> </span></h1>
<h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">For example, I has fitted a pump power curve equation as followings<o:p></o:p></span></h1>
<h1><span lang="EN-US" style="font-size:12.0pt">p = 56877 + 49714(m/m <sub>rated</sub>)
+ 1094.3(m/m <sub>rated</sub>) ^2 (R² =
0.9959), So the setting is :<o:p></o:p></span></h1>
<p style="line-height:17.25pt"><span lang="EN-US" style="font-family: Calibri, sans-serif;">power coefficient-1 = a0=56877 (Parameter 6 for TYPE 743)<o:p></o:p></span></p>
<p style="line-height: 17.25pt;"><span lang="EN-US" style="font-family: Calibri, sans-serif;">power coefficient-2 = a1=49714
(Parameter 7 for TYPE 743)<o:p></o:p></span></p>
<p style="line-height: 17.25pt;"><span lang="EN-US" style="font-family: Calibri, sans-serif;">power coefficient-3 = a2=1094.3(Parameter 8 for TYPE 743)<o:p></o:p></span></p>
<h1><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold"> May you tell me the
reason? Thank you very much for your time!<o:p></o:p></span></h1><div><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">with best regards</span></div><div><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold"><br></span></div><div><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">yours sincerely</span></div><div><span lang="EN-US" style="font-size:12.0pt;font-weight:normal;mso-bidi-font-weight:
bold">Weiwei</span></div><div>Chongqing University</div><br><div><hr id="stopSpelling">From: xiaoweiweiwu@hotmail.com<br>To: trnsys-users@lists.onebuilding.org<br>Subject: Type743’s power coefficients parameter setting<br>Date: Mon, 16 Nov 2015 13:49:52 +0800<br><br>
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<div dir="ltr"><font size="3">Dear all, </font><h1><span style="font-weight:normal;"><font size="3">In the type743’s document, there is an equation743.1 about P, which is power drawn the pump, as following:</font></span></h1><h1><span style="font-weight:normal;"><font size="3">P=a0+a1(m/mrated)+ a2(m/mrated)2+ a3(m/mrated)3+………..</font></span></h1><h1><span style="font-weight:normal;"><font size="3">In the type743’s parameter setting, parameter number 5 is set to“number of power coefficients”,if I input “3”then the parameter number6、7 、8 is as following：</font></span></h1><h1><span style="font-weight:normal;"><font size="3">power coefficient-1</font></span></h1><h1><span style="font-weight:normal;"><font size="3">power coefficient-2</font></span></h1><h1><span style="font-weight:normal;"><font size="3">power coefficient-3</font></span></h1><h1><span style="font-weight:normal;"><font size="3">And the explanation about the coefficient is “The value of the polynomial multiplier for the relationship between normalized pump power and normalized pump flow rate”.</font></span></h1><h1><span style="font-weight:normal;"><font size="3">My question is:</font></span></h1><h1><span style="font-weight:normal;"><font size="3">1)whether a1、a2 a3 is correspond to power coefficient-1、power coefficient-2 and power coefficient-3 respectively? if yes, how to set the value </font></span><span style="font-size:12pt;font-weight:normal;">a0? or i just need fitting an equation that </span><span style="font-size:12pt;font-weight:normal;">a0 is zero?</span></h1><h1><span style="font-weight:normal;"><font size="3">2)If not ,what is the right relationship between them?</font></span></h1><h1><span style="font-weight:normal;"><font size="3">In addition, I referred to an example named “pumps with flow rate known” in Tess models of TRNSYS software, the type743’s parameter 5 is set to 3, and the parameter6 and 7 (power coefficient-1、power coefficient-2) are both 0, while parameter 8 is set to 1. The similar situation setting could be found in other types such as TYPE510’s power coefficient.</font></span></h1><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3">Thank
you very much help me out of this issue.</font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3"><br></font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3">With best regards</font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3"><br></font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3">Yours sinscerely</font></span></div><div><span style="font-size:12pt;font-family:Calibri, sans-serif;">Weiwei</span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3"><br></font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3">Chongqing university</font></span></div><div><span lang="EN-US" style="font-family:Calibri, sans-serif;"><font size="3"><br></font></span></div><h1><span style="font-size:19px;font-weight:normal;"><br></span></h1><h1><span style="font-size:19px;font-weight:normal;"> </span></h1><h1><span style="font-size:19px;font-weight:normal;"><br></span></h1><h1><span style="font-size:19px;font-weight:normal;">Thank you very much help me out of this issue. </span></h1> </div></div> </div></body>
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