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<p>Asad,</p>
<p> You can write an equation that compares the value of the total
solar radiation incident on the plane of the collector with your
on/off value. For example:</p>
<p>collOn = GT(Isolar,0)</p>
<p>the variable collOn will have a value of 1 if the value of Isolar
is greater than zero.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 10/07/2016 12:43, Asad Riaz via
TRNSYS-users wrote:<br>
</div>
<blockquote cite="mid:345305240.204458.1475862215615@mail.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:bookman
old style, new york, times, serif;font-size:16px">
<div id="yui_3_16_0_ym19_1_1475861230256_5067"><span
id="yui_3_16_0_ym19_1_1475861230256_5119">Hi Everyone, I am
working on simulations of parabolic trough power plant and
facing problem in finding a controller which will "ON" the
power plant model only when there is solar radiations
falling on solar collectors and "OFF" when there is no solar
radiations falling on collectors!</span></div>
<div id="yui_3_16_0_ym19_1_1475861230256_5074"> </div>
<div class="signature" id="yui_3_16_0_ym19_1_1475861230256_5075">
<div id="yiv3530382321yui_3_16_0_1_1456558635882_3898"
dir="ltr" style="font-family:'bookman old style', 'new
york', times, serif;"><span class="yiv3530382321"
id="yiv3530382321yui_3_16_0_1_1456558635882_6044"
style="font-weight:700;"><span class="yiv3530382321"
id="yiv3530382321yui_3_16_0_1_1456558635882_6045"><font
id="yiv3530382321yui_3_16_0_1_1456558635882_6223"
color="#652191"><span
id="yiv3530382321yui_3_16_0_1_1456558635882_4872"
class="yiv3530382321" style="font-size:13px;"><span
id="yiv3530382321yui_3_16_0_1_1456558635882_4874"
class="yiv3530382321" style="font-size:medium;">Asad
Riaz,</span></span></font></span></span></div>
<div id="yiv3530382321yui_3_16_0_1_1456558635882_3898"
dir="ltr"><span class="yiv3530382321"
id="yui_3_16_0_ym19_1_1475861230256_5083"><span
class="yiv3530382321" style="font-size:small;"
id="yui_3_16_0_ym19_1_1475861230256_5082"><font
id="yui_3_16_0_ym19_1_1475861230256_5081"
color="#652191"><span class="yiv3530382321"
id="yui_3_16_0_ym19_1_1475861230256_5080"><span
style="font-family:'bookman old style', 'new
york', times, serif;"
id="yui_3_16_0_ym19_1_1475861230256_5079">MS
Energy Systems Engineering,</span></span><br
id="yiv3530382321yui_3_16_0_1_1456558635882_4880"
class="yiv3530382321">
U.S.-Pakistan Center for Advanced Studies in Energy,<br>
</font></span></span></div>
<div id="yiv3530382321yui_3_16_0_1_1456558635882_3898"
dir="ltr"><span style="font-size:small;color:rgb(101, 33,
145);font-family:'bookman old style', 'new york', times,
serif;" id="yui_3_16_0_ym19_1_1475861230256_7560">NUST,
Sector H-12, Islamabad, Pakistan.</span></div>
<div id="yiv3530382321yui_3_16_0_1_1456558635882_3898"
dir="ltr"><span style="color: rgb(101, 33, 145); font-size:
small;" id="yui_3_16_0_ym19_1_1475861230256_7638">Email:
<a class="moz-txt-link-abbreviated" href="mailto:asadriaz2999@yahoo.com">asadriaz2999@yahoo.com</a></span><span
style="font-size:small;color:rgb(101, 33,
145);font-family:'bookman old style', 'new york', times,
serif;"><br>
</span></div>
</div>
</div>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
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