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Re: Windows ID number in SimCad
- Date: Thu, 11 Mar 2004 08:35:03 -0600
- From: David Bradley <bradley@xxxxxxxxxxxx>
- Subject: 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
****************************************************************************************
Thermal Energy System Specialists (TESS)
David
BRADLEY
2916 Marketplace Drive - Suite 104
Partner
Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley@xxxxxxxxxxxx
Web Pages:
http://www.tess-inc.com
and
http://www.trnsys.com
"Providing software solutions for today's energy engineering
projects"
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