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Re: Windows ID number in SimCad



Dear Olympia

For this reason the second and the third line have more than 160 characters and
thus cannot be input to IIsiBat in .tpf file

How can I solve this problem?

On the TRNSYS side, you should be able to use more than one Type68 and thereby have some of your windows in one .msk file and some of your windows in another. There are two ways that you could go about this. If SimCad is correctly generating a .msk for all the windows at once, then you can modify the resulting file by hand to break it up into multiple files. If you would rather, you can select a subset of your windows in SimCad, generate a .msk file for them, then go back and select the next subset.

In TRNSYS type 68, the third parameter is the number of surface angles for each opening
How do I choose this parameter?

unfortunately the choice of this parameter is often dictated by the maximum allowable width of the deck and of data files (160 characters in TRNSYS 15, settable in TRNSYS 16). If you are not limited by the 160 character limit, then you want to use as many surface angles as possible because the number of surface angles dictates the precision of your shading analysis. Type68 reads an obstruction height at each surface angle projected from the opening. It then holds that obstruction height constant until it encounters the next surface angle. In essence, Type68 digitizes your shading profile by turning the shaded view from the window into a series of steps. The more surface angles you have, the smaller the steps and the more precise your analysis. Keep in mind also that half of the surface angles project in front of the window and half of the surface angles project behind the window. The logic of this is a bit confusing for vertical windows but it becomes necessary when you are dealing with tilted skylights. For a more detailed explanation of this distinction I would refer you to the technical description of Type68 in the main TRNSYS manual.

Kind regards,
  David

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