<div>Hi Ross, </div>
<div> </div>
<div>According to Energy Plus engineeringreference " <font size="2" face="Arial"><font size="2" face="Arial">There are three options to calculate mean radiant temperature in the thermal comfort models. One is the zone averaged MRT, another is the surface weighted MRT, and the other is angle factor MRT. The zone averaged MRT is calculated on the assumption that a person is in the center of a space, whereas the surface weighted MRT is calculated in consideration of the surface that a person is closest to, and the angle factor MRT is calculated based on angle <font size="2" face="Arial"><font size="2" face="Arial">factors between a person and the different surfaces in a space. Here, the surface weighted MRT is the average temperature of the selected surface and zone averaged MRT and is intended to represent conditions in the limit as a person gets closer and closer to a particular surface. In that limit, half of the person’s radiant field will be dominated by that surface and the other half will be exposed to the rest of the zone. Note that the surface weighted MRT is only an approximation. The angle factor MRT is the mean temperature of the surrounding surface temperatures weighted according to the magnitude of the respective angle factors and allows the user to more accurately predict thermal comfort at a particular location within a space." </font></font></font></font></div>
<div> </div>
<div>Meanwhile, t<font size="2" face="Arial"><font size="2" face="Arial">he effective temperature of the screen/glazing combination that is used to calculate the window’s contribution to the zone’s mean radiant temperature (MRT) is calculated with respect only to long wave radiation. Therefore I believe the mean radiant temperature calculation for energy + does not take into account direct solar radiation through the window. </font></font></div>
<div> </div>
<div>To my understanding, "a person standing near a window" is the exceptional case when indoor thermal comfort calculation, such as Fanger's model, is implemented. Please bear in mind, those indoor thermal comfort equations are normally based upon extensive indoor survey results and the survey were unlikely carried out in extreme conditions, such as under direct solar radiation. Fortunately. many outdoor thermal models are developing recently (i.e. <a href="http://www.urbanclimate.net/matzarakis/papers/Radiation_6hellenic.pdf">http://www.urbanclimate.net/matzarakis/papers/Radiation_6hellenic.pdf</a>). You may try to explain your scenario with respect to these models. </div>
<div> </div>
<div>A good paper regarding calculation of MRT outdoors can be found at <a href="http://www.gvc2.gu.se/Ngeo/bjorn/pdf/referee/12%20-%20Thorsson%20et%20al%202007.pdf">http://www.gvc2.gu.se/Ngeo/bjorn/pdf/referee/12%20-%20Thorsson%20et%20al%202007.pdf</a></div>
<div> </div>
<div>Regards, </div>
<div> </div>
<div>Cheney Chen </div>
<div> </div>
<div>LinkedIN @ <a href="http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b">http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b</a> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div>On Mon, Dec 6, 2010 at 9:20 AM, Harding, Ross <span dir="ltr"><<a href="mailto:ross.harding@built-ecology.com">ross.harding@built-ecology.com</a>></span> wrote:<br></div>
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<p class="MsoNormal">Hi All,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Does anyone know if the for mean radiant temperature calculation for energy plus has the ability to take into account direct solar gain (ie not indirectly from surfaces)? </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">If not, how could this be accounted for in thermal comfort? Results from a person standing near a window could be quite misleading if the direct solar gain is not taken into account.</p>
<p class="MsoNormal"> </p>
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