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<p class="MsoNormal">Hi Miriam,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You could read the 06-HVACLibraryMathematicalReference.pdf in the documentation of the TESS Models which shows all the calculations for Type941.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal">Paris Pasqualin<o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>trnsys-users@lists.onebuilding.org<br>
<b>Sent:</b> 21 March 2022 12:02<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org><br>
<b>Cc:</b> miriam di matteo <dimatteo.1585179@studenti.uniroma1.it><br>
<b>Subject:</b> [TRNSYS-users] COP Type 941 Ait to water Heat Pump<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p>Dear all users,<o:p></o:p></p>
<p>About the Type 941 (Trnsys v.17):<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
First: can you confirm if I understand its functioning? I use it only for heating, at the moment.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
Second: I believe that the values of the COP it isn’t correct, or I don’t understand it. The COP trend depends on the external files with the heating performance data, is it? In this file I have:<br>
Capacity increases when the entered water temperature decreases and the air temperature increases ( <Tin,w and >Tin,a → >Capacity)<br>
Power increases when the entered water temperature increases and the air temperature decreases ( >Tin,w and <Tin,a → >Power)<br>
So the COP increases when the entered water temperature decreases and the air temperature increases ( <Tin,w and >Tin,a → >COP). But the simulation gives opposites results. The external files are wrong? or I misunderstand the Type functioning?<br>
I tried to calculate the COP with excel and the results come out as per the provision, therefore different from TRNSYS' results. <o:p></o:p></li></ul>
<p>About the first question:<o:p></o:p></p>
<p>I know as <strong><span style="font-family:"Calibri",sans-serif">Parameters:</span></strong><o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
Specific Heat of Liquid Stream<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
Blower Power (pb)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
Total Air Flowrate (Fa,d)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
Rated Heating Capacity (qh,d)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
Rated Heating Power (ph,d)<o:p></o:p></li></ul>
<p><strong><span style="font-family:"Calibri",sans-serif">and as Input:</span></strong><o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Inlet Liquid Temperature (Tin,w)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Inlet Liquid Flowrate (Fin,w)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Inlet Air Temperature (Tin,a)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Inlet Air Humidity Ratio<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Inlet Air % Relative Humidity<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
Heating Control Signal<o:p></o:p></li></ul>
<p>and as <strong><span style="font-family:"Calibri",sans-serif">external files</span></strong><o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
Heating and cooling catalog data for the capacity and power as a function of entering the water and air temperature (fc=f(Tin,a;Tin,w) and fp=f(Tin,a;Tin,w))<o:p></o:p></li></ul>
<p>So when the simulation running:<o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
The Type 941 reads the air and water entering temperature (Tin,w and Tin,a)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
Interpolates the heating performance file and multiplies this “performance factor” by HP Rated capacity and power. (fc(Tin,a;Tin,w) and fp(Tin,a;Tin,w))<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
So obtain Capacity and Power as a function of entering the water and air temperature by each time step. (qh(t)=fc<em><span style="font-family:"Calibri",sans-serif">qh,d and ph(t)=fp</span></em>ph,d)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
Calculates the COPh as a ratio between qh(t)/(ph(t)+pblower) , i put paux=0<o:p></o:p></li></ol>
<p>Is it correct??<o:p></o:p></p>
<p>Thank you in advance,<br>
Regards,<br>
Miriam Di Matteo<o:p></o:p></p>
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