<div dir="ltr"><div>Hi Jon</div> <div> </div> <div>many thanks for your useful imformation, I have download the newest version (11.5), and I can see the result list  for the diffuse shading, I think that is actually  the so call Sky View Facter , coz it is defined by the proportion of  How much sky ia able to be seen .</div> <div> </div> <div>as we know, there are generally 2 methods for calculating  the " diffuse shading", one is numerical methods to integral the segment of sky dome, the others way is geometric methods (fish-eye concept with ray-tracing way) to account the amount of spray ray.  I am just wondering  what kinds of method Esp-r use here ? any documentation/ reference is available to understand the code of this calculation? </div> <div> </div> <div> </div> <div>the 2rd question, under the menu of Model Context , what does the Sky View Factor mean?</div> <div>is it the global setting as the average SVF for every surface of the building geometry? or it's juat a empirical setting ? what is the criteria for set this value?</div> <div> </div> <div>the last qustion, again, can esp-r calculate the insolation for the external face of surface?</div> <div> </div> <div>thank you very much indeed.</div> <div> </div> <div>Sean</div> <div> </div> <div><br><br> </div> <div class="gmail_quote">2008/7/22 Jon Hand <<a href="mailto:jon@esru.strath.ac.uk">jon@esru.strath.ac.uk</a>>:<br> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>A question about shading and about sky view factors.<br><br>In the ish module, when the term 'shading' is used it<br> actually is shading on the outside face of surfaces facing the<br>outside. If there is some place in the documentation and/or<br>contextual help that would indicate something else please<br>let us know so we can correct this.<br> <br>And the shading in the newist version can calculate both<br>the direct and diffuse shading. The diffuse shading has<br>a good idea of how much of the sky is seen from each<br>surface.<br><br>The sky view factor is set globally in the 'context' menu<br> based on the building/sky/ground settings.<br><br>Not sure if I know of an application which calculates sky view<br>factors direction. Perhaps someone else does.<br><font color="#888888"><br>-Jon Hand<br></font> <div class="Ih2E3d"><br>-----Original Message-----<br>From: <a href="mailto:esp-r-bounces@lists.strath.ac.uk">esp-r-bounces@lists.strath.ac.uk</a> on behalf of Sean C Lu<br>Sent: Tue 7/22/2008 8:57 PM<br>To: <a href="mailto:esp-r@lists.strath.ac.uk">esp-r@lists.strath.ac.uk</a><br> Subject: [esp-r]  Sky view factor & External insolation<br><br></div> <div> <div></div> <div class="Wj3C7c">Hi<br><br>I am thinking to use Esp-r to simulate the solar performace of shading<br>device ( for exampe, the shading device integrated with solar collector) .<br>one of the task is to calculate the  solar radiation received by the surface<br> of the external shading device.<br><br>there are two questions for the calculation of incident radiation :<br><br>1 can esp-r calculate the insolation for the external face of surface? (The<br>shading and insolation program (ish) can only calculate the distribution of<br> insolation within ZONE ?)<br><br><br>2 as we know, the Incident Radiation of Surface = Unshaded Fraction<br>* Incident Beam Radiation + Sky View Facter * Incident Diffuse Radiation +<br>Ground Diffuse Radiation<br>to calculate the component of diffuse radiation ( the 2rd term)  , the<br> fraction of Sky View Facter must be known, is there any application can<br>calculate the SVF? ( it seems that the application of ESPmrt  only calculate<br>the viewfactors between surfaces within A ZONE)<br><br><br>many thanks for your help.<br> <br>--<br>Sean Lu<br>1st floor SRB<br>School of the Built Environment<br>The university of Nottingham<br>NG7 2RD<br>[m] 0775 144 5367<br>[O] 0115 84 67260<br>[e ]<a href="mailto:laxcl@nottingham.ac.uk">laxcl@nottingham.ac.uk</a><br> <br>trees Before printing Please think about the environment<br><br></div></div></blockquote></div><br><br clear="all"><br></div>