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Idris,<br>
In the case without the forcing function, there are 700W/m2 of
solar radiation incident on the collector surface at all times. In
the case with the forcing function there is whatever amount of solar
radiation that the forcing function determines there to be. Please
bear in mind that when you change the units of an input, TRNSYS <i>does
not</i> perform any automatic unit conversions. The Type expects
to receive a value in the default units (kJ/h.m2 in this case). If
your forcing function is giving a value, that value is being
interpreted by Type538 as being given in kJ/h.m2.<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/9/2015 11:04, Shofolahan, Idris
Adewale wrote:<br>
</div>
<blockquote cite="mid:1425917052260.82737@lsbu.ac.uk" type="cite">
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<p>Hi there,<br>
</p>
<p><br>
</p>
<p>I'm working on solar water heating system.I wanted to test
the performance of the weather file before using it, by
replacing it with the generic forcing function type 14h to
keep the beam radiation on the tilted surface of component
type 538 . <span style="font-size: 12pt;">I compared the
outlet temperature with and</span><span style="font-size:
12pt;"> without the forcing functions type 14h.</span></p>
<p><img size="192661" contenttype="image/png" id="img696746"
contextid="img318100" tabindex="0" aria-haspopup="true"
aria-owns="_ariaId_398" aria-flowto="_ariaId_398"
style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px; max-width: 99.9000015258789%;
-webkit-user-select: none; margin: 5px; background-color:
rgb(255, 255, 255);" class=""
src="cid:part1.07070005.02010301@tess-inc.com"><br>
</p>
<p><br>
</p>
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style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:; margin:0">
<p><span style="font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255,
255, 255);">I plotted the </span><span
style="font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255,
255, 255);"></span><span style="font-family: Calibri,
Arial, Helvetica, sans-serif; font-size: 16px;
background-color: rgb(255, 255, 255);">output
temperature </span><span style="font-family: Calibri,
Arial, Helvetica, sans-serif; font-size: 16px;
background-color: rgb(255, 255, 255);">on the online
printer,but the</span> model without the forcing
function gave an output temperature of 20.8 degrees while
output temp. of the model with the forcing function was
15.8 degrees. Find screenshot of the two above. What is
the reason for the difference in the output temperature of
the models? <br>
</p>
<p><br>
</p>
<p>Regards<br>
</p>
<p>Idris<br>
</p>
<p> <br>
</p>
</div>
</div>
</div>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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