Xavier,shading has become more and more of a problem in TRNSYS - the developers are working on a much more streamlined, long term solution that will simplify and automate the input.I understand the ideas. I am quite new to trnsys and it seems to be quite tedious The most reliable method is to define a new ORIENTATION in Prebid (or TRNBuild for TRNSYS 16 users), to define your window in the zone as an "Additional Window" and not as a new wall that is the same area as the window that you want to add.1- I should create a new wall = my window with the given new orientation. Sabina, Do you write this directly in the bld-file? the one disadvantage of this method is that Prebid and TRNBuild treat both beam and diffuse radiation equally when it comes to external and internal shading factors. Thus if you put a shading factor of 0.5, both incident beam and diffuse radiation will be cut in half. The advantage of the previous method (defining a new orientation) is that Type34 and Type68 treat beam and diffuse radiation seperately - beam radiation might be completely blocked while diffuse radiation is cut down by the appropriate amount.2- in Prebid, for the description of a window, there is an option called: «external shad. factor» where it is possible to get an input! But I do not find it again in my input list in IISIBAT. I do not find any doc about this kind of input. To answer your specific question about not finding the input in IISiBat, what you need to do is click on the little blue button next to the External Shading Factor field. You then have three options for defining the shading: setting a constant value, creating a new INPUT, or designating a SCHEDULE. You'll want to select "Input" and then give this new input a name such as "EXTSHD." Once you have regenerated your Type56 files (*.trn, *.bld, *.bui, and *.inf) the list of inputs in the *.inf file will include your newly defined input (EXTSHD). Switch to IISiBat, right click on the Type56 icon and select "update building variable list." IISiBat will then reread the *.inf file and include the newly created INPUT. Kind regards, David -- ** David BRADLEY Solar Energy Laboratory University of Wisconsin - Madison 1500 Engineering Drive Madison, WI 53706 United States Ph: +1 608 263 1589 Fax: +1 608 262 8464 Email: dbradley@engr.wisc.edu |