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<p class=MsoNormal>Dear TRNSYS community,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It seems that there are some differences between the “
Effective sky temperature” available in the weather component (e.g. Type 15-6)
and the “fictive sky temperature” calculated with the Type69b. The differences
are quite important and I would like to know which one I should “trust” to
calculate some IR-emissions towards the sky.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I attached a simple testing project in which I plotted
the following graphs:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The <u>“effective sky temperature”</u> , straight from
the weather component <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The <u>ambient (dry-bulb) temperature</u><o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The <u>average</u> between “effective sky temperature”
and “ambient temperature”<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>The <u>“fictive sky temperature”</u> calculated by the
Type69b (using “<b>total diffuse</b> <b>radiation</b>” as an input)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>What comes out of this graph is that the “average
temperature” is quite close to the “fictive sky temperature” calculated by
Type69b. <o:p></o:p></p>
<p class=MsoNormal>So where do the differences come from and which temperature
should I use?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thank you for your help.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>François Badinier<o:p></o:p></p>
<p class=MsoNormal><span style='color:#C0504D'>Development Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#00B050'>ICAX Ltd<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#00B050'>1 Hatfield House
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#00B050'>Baltic Street
West<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#00B050'>London EC1Y OST<o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:8.0pt;font-family:"Courier New";
color:black'><a href="mailto:alan.kiff@icax.co.uk"><span lang=EN-GB>francois.badinier@icax.co.uk</span></a></span><span
style='font-size:8.0pt;font-family:"Courier New";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:8.0pt;font-family:"Courier New";
color:black'><a href="http://www.icax.co.uk"><span lang=EN-GB>www.icax.co.uk</span></a></span><span
style='font-size:8.0pt;font-family:"Courier New";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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