<div dir="ltr">Can I run the simulation by assigning IR emissivity and solar absorptivity to materials located deep inside a construction? Like brick? <div class="gmail_extra"> <div class="gmail_quote">On Wed, May 8, 2013 at 4:59 PM, Jon Hand <<a href="mailto:jon@esru.strath.ac.uk" target="_blank">jon@esru.strath.ac.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> The issue of paint mentioned below. There are several examples of applying paint or a coating to materials. - there are several types of concrete which are identical except for the surface properties - white painted and stone colour. Or Steel and Beige painted steel and White painted steel. This approach is based on the assumption that the thin layer only makes a tiny impact on the conductivity density and specific heat of the material. I would advise against treating a paint layer as transparent. Seems overly complex and getting the optical data would be a challenge. Surface solar absorption and emissivity is sometimes based on approximate information in the literature of building simulation. It is possible to measure, few people do this. Regards, Jon Hand ________________________________________ 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>] Sent: 08 May 2013 09:18 To: ESP-r Users' Club Subject: [esp-r] Regarding thermal and optical properties of construction materials <div class="HOEnZb"><div class="h5"> Hi 1. Thermal properties: 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. _________________________________________ 1 : 1.67 : 2.84 reinforced concrete (C:S:A) 1:4 cement mortar plaster 1:4 cement sand plaster vitrified tiles typical values for fiberglass reinforced plastic typical values for ply typical values for brickbat _________________________________________ 2. Optical properties The library doesn't include layers of paint. I intend to create a new material by assigning the following properties: conductivity: infinite // is this allowed density: 0 // is this allowed specific heat: same as that of underlying plaster 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? 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). 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. Where do I find the detailed optical data of 'white emulsion paint' and 'grey emulsion paint’? Thanks, Satya </div></div></blockquote></div> </div></div>