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<font style="font-size: 12pt;" size="3">Hello,</font><font style="font-size: 12pt;" size="3"><br></font><font style="font-size: 12pt;" size="3"><br></font><font style="font-size: 12pt;" size="3">I have startet to simulate a solar hot water system. I am using a CPC collector (solar thermal collectors Type 74 in TRNSYS). In this type </font><font style="font-size: 12pt;" size="3"><span id="result_box" lang="en"><span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">there are</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">many</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">parameters</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">that</span> I can <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">not find in any</span> collector <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">report</span><span title="Zur Anzeige alternativer Übersetzungen klicken">.</span></span></font><font style="font-size: 12pt;" size="3"> This parameters are listed below:</font><br><br><br><p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Collector fin efficiency
factor:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> The fin efficiency
is a measure of the heat transfer from the fin to the maximum possible heat
transfer from the fin. </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';">The maximum heat transfer from the fin
would occur if the fin was uniformly at the base temperature.</span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"><br>
<br>
<b>Overall Loss Coefficient [kJ/hr.m^2.K]:</b> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">The loss coefficient of
the solar collector per unit aperature area.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Wall reflectivity:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> The reflectivity of the
walls of the CPC collector. </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">The reflectivity is a ratio of the reflected radiation to
the toal incident radiation.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Half-acceptance angle:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">The half-acceptance angle
of the CPC collector. The CPC collects both beam and diffuse radiation which approach
the aperature within the critical angle, or half-acceptance angle.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Truncation ratio: </span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">A full CPC is one in which
the walls extend upward to a height h which gives an aperature area <span style=""> </span>of 1/sin(halfacceptance angle) times the
absorber area. </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">Optimal
concentration is achieved in a full CPC, but a very large</span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES"> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">reflector is required. </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';">Most CPC's are truncated to some fraction of
this height hbar.</span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';"> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';">Truncation ratio = hbar/h</span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"></span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Absorptance of absorber
plate:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> The absorptance of
the absorber plate of the solar collector. The absorptance is a ratio of the
amount of </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES">radiation absorbed
by a surface to the total radiation incident on the surface.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="ES"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Index of refraction of
cover:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';">The index
of refraction of the material covering the solar collector absorber plate.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';"> </span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN">Extinction coeff. Thickness
product:</span></b><span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"> </span><span style="font-size: 10pt; font-family: 'Arial','sans-serif';">The
product of the extinction coefficient and the thickness of one of the glazings
covering the solar collector absorber plate.</span></p>
<p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: 'Arial','sans-serif';"> </span></p><font style="font-size: 12pt;" size="3"><br></font><p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><font style="font-size: 12pt;" size="3"><span id="result_box" class="short_text" lang="en"><span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">Does anyone have</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">experiences regarding to using of</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">CPC</span> <span title="Zur Anzeige alternativer Übersetzungen klicken" class="hps">collector</span><span title="Zur Anzeige alternativer Übersetzungen klicken">s in TRNSYS?</span></span></font></p><p class="ecxMsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span id="result_box" class="short_text" lang="en"><span title="Zur Anzeige alternativer Übersetzungen klicken"><br></span></span></p>
<span style="font-size: 10pt; font-family: 'Arial','sans-serif';" lang="EN"><br><br>
Shahrdad</span><br><br> </body>
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