<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Satya<div><br></div><div>each material has an assigned reflectivity and IR emissivity. For a multi-layered construction, however, only the outermost values (inside and outside faces of the construction) are relevant for the simulation.</div><div><br></div><div>Best</div><div>Achim</div><div><br></div><div><br></div><div><br><div><div>On May 9, 2013, at 1:32 AM, Satya <<a href="mailto:ringo.satyarr@gmail.com">ringo.satyarr@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Can I run the simulation by assigning IR emissivity and solar absorptivity to materials located deep inside a construction? Like brick?<br><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 8, 2013 at 4:59 PM, Jon Hand <span dir="ltr"><<a href="mailto:jon@esru.strath.ac.uk" target="_blank">jon@esru.strath.ac.uk</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br> The issue of paint mentioned below.  There are several examples of applying paint or a coating<br> to materials. - there are several types of concrete which are identical except for<br> the surface properties  - white painted and stone colour.  Or Steel and Beige painted steel and White painted steel.<br> <br> This approach is based on the assumption that the thin layer only makes a tiny impact on the conductivity<br> density and specific heat of the material.<br> <br> I would advise against treating a paint layer as transparent.  Seems overly complex and<br> getting the optical data would be a challenge.<br> <br> Surface solar absorption and emissivity is sometimes based on approximate information in<br> the literature of building simulation.  It is possible to measure, few people do this.<br> <br> Regards, Jon Hand<br> ________________________________________<br> From: <a href="mailto:esp-r-bounces@lists.strath.ac.uk">esp-r-bounces@lists.strath.ac.uk</a> [<a href="mailto:esp-r-bounces@lists.strath.ac.uk">esp-r-bounces@lists.strath.ac.uk</a>] On Behalf Of Satya [<a href="mailto:ringo.satyarr@gmail.com">ringo.satyarr@gmail.com</a>]<br> Sent: 08 May 2013 09:18<br> To: ESP-r Users' Club<br> Subject: [esp-r] Regarding thermal and optical properties of construction       materials<br> <div class="HOEnZb"><div class="h5"><br>  Hi<br> <br> 1. Thermal properties:<br> <br>  I have a list of building materials used for the building I am trying to model. Unfortunately, none of these materials are listed in the ESP-r library. Where can I find the relevant properties of those materials which ESP-r needs to run a simulation? Here is the list of the materials.<br> <br> _________________________________________<br> <br> 1 : 1.67 : 2.84 reinforced concrete (C:S:A)<br> <br> 1:4 cement mortar plaster<br> <br> 1:4 cement sand plaster<br> <br> vitrified tiles<br> <br> typical values for fiberglass reinforced plastic<br> <br> typical values for ply<br> <br> typical values for brickbat<br> <br> _________________________________________<br> <br> <br> <br> 2. Optical properties<br> <br>  The library doesn't include layers of paint. I intend to create a new material by assigning the following properties:<br> <br> conductivity: infinite // is this allowed<br> <br> density: 0 // is this allowed<br> <br> specific heat: same as that of underlying plaster<br> <br> <br> <br> But how do I estimate IR emissivity and solar absorptivity? The internal paint is a white and external is grey. Is there an easy way to measure it or are there typical values for paints depending on the colour? Where do I find this data?<br> <br>  It also occurred to me that the paint layer, being very thin, could be modelled as a transparent construction because my guess is that it does let light pass through because of how thin it is. However, for this I will need to find 8 optical properties of paint (3 types of transmittances, 4 types of reflectences and colour rendering).<br> <br> I understand that this is more accurate but if anybody tells me that an opaque material type paint won't lead to major inaccuracies, I will gladly work with an opaque paint.<br> <br>  Where do I find the detailed optical data of 'white emulsion paint' and 'grey emulsion paint’?<br> <br>  Thanks,<br> <br> Satya<br> <br> </div></div></blockquote></div><br></div></div> _______________________________________________<br>esp-r mailing list<br><a href="mailto:esp-r@lists.strath.ac.uk">esp-r@lists.strath.ac.uk</a><br>http://lists.strath.ac.uk/mailman/listinfo/esp-r</blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div><a href="mailto:achim.geissler@intergga.ch">achim.geissler@intergga.ch</a></div><div><br></div><div><br></div></span><br class="Apple-interchange-newline"> </div> <br></div></body></html>