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<DIV><FONT size=2>Dear David,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>thank's for your help on the shading
coefficients...</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I have two new questions for the TRNSYS
users:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>1) In my project there are two adjacent buildings
but the contact is not direct (air gap of 30 cm) so I need to define a
radiation to 2 wall which are always shaded. In PREBID (or TRNBuild) there
aren't shading coefficient to reduce the direct solar radiation for the wall (as
for the windows), so I think is necessary to modify the radiation in IISiBat (or
TRNSYS Studio).</FONT></DIV>
<DIV><FONT size=2>Type 68 (Shading Masks) seems the correct tool, but I need a
external file with the angular obstruction data. Maybe I can use type 34
(Overhang and Wingwall shading) in which the dimensions of the obstruction are
set to a very high value. Is it exact? Do simpler ways exist to
proceed?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>2) Last week I have tried to transfer my old Trnsys 15
projects in Trnsys 16. I have a problem with type 16e (Radiation processor) when
I try to calculate beam and diffuse radiation for a vertical surface with azimut
among 225 (NE) and 315 (SE). The simulation is annual but stop with warnings and
error at time 994 with the following notice:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2><EM>TRNSYS Message 450: The maximum number of warnings allowed
per simulation has been exceeded. Please fix these warnings or increase the
limti on the number of warnings allowed per simulazion (LIMITS
command)</EM></FONT></DIV>
<DIV><EM><FONT size=2></FONT></EM> </DIV>
<DIV><FONT size=2>The same climatic data return the expected results when I
use TRNSYS 15's radiator processor. Non running project is
attached.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>
<DIV><FONT size=2>Thank's in advance,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Eng. Maurizio Sorce<BR></FONT><EM><FONT size=2>Department of
Energy and Environmental Research (DREAM)<BR>Università degli Studi di
Palermo</FONT></EM></DIV>
<DIV><EM><FONT size=2>(+39) 3495386296</FONT></EM></DIV></DIV></DIV></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bradley@tess-inc.com href="mailto:bradley@tess-inc.com">David
Bradley</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ksorce@tin.it
href="mailto:ksorce@tin.it">Maurizio Sorce</A> ; <A
title=trnsys-users@engr.wisc.edu
href="mailto:trnsys-users@engr.wisc.edu">Mailing list TRNSYS</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 15, 2004 5:06
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [TRNSYS-users] Windows
shading coefficients</DIV>
<DIV><BR></DIV>Dear Maurizio<BR><BR>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT size=2>1) I'm currently
modelling in PREBID a residential building for which the montly Shading
Coefficients on the windows have been calculated with the software ECOTECT.
I insert the SC in the appropriate field ("external shading coefficient") as
an input and set the "view factor" to 0,5 (vertical surfaces). It's the
exact way? My doubt is that the solar incident radiation is halved (view
factor = 0,5) and then reduced of the SC...</FONT></BLOCKQUOTE><BR>It is
correct, provided that the shading coefficient from Ecotect is the opaque
fraction of the window (i.e. 1 = completely shaded).<BR>The view factor to the
sky (FSky) is only used for longwave radiation so it will not interfere with
shading.<BR><BR>The one thing to bear in mind about PREBID's external and
internal shading coefficient is that the entered fraction effects both beam
and diffuse radiation equally. Thus if you enter a value of 0.5 for the
external shading factor, half of the incident diffuse radiation and half of
the incident beam radiation will enter the space. If you want to treat beam
and diffuse radiation separately, you can use one of the external shading
models (Type34, or Type68).<BR><BR>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT size=2>2) It's possible to
use old TESS libraries with TRNSYS 16 or are they already comprised in the
new version?</FONT></BLOCKQUOTE><BR>Because of the change in coding standards
for components between version 15 and 16, the TESS Libraries <I>v. </I>1.x are
not directly useable with TRNSYS <I>v</I> 16. We have, however, expanded the
libraries and released version 2.0, which are not only compatible with TRNSYS
16 but are also backwards compatible with TRNSYS 15. If you are interested in
upgrading, you will be credited the full amount that you paid for your version
1.x libraries toward the purchase of version 2.x libraries. If you do not wish
to upgrade then you can follow the steps laid out in the TRNSYS 16
documentation that show you how to modify a TRNSYS 15 Type to make it
accessible from TRNSYS 16. I will send along a second email containing a
document that lists the contents of the 12 version 2.0 libraries as well as an
order form that contains the pricing information. I would be happy to answer
any questions that you might have about them.<BR><BR>Kind regards,<BR>
David<BR><BR><X-SIGSEP>
<P></X-SIGSEP><FONT
size=2><I>****************************************************************************************<BR>Thermal
Energy System Specialists (TESS), LLC <BR>David
BRADLEY
2916 Marketplace Drive - Suite 104
<BR>Partner
Madison, WI 53719 <BR>Phone: (608) 274-2577 USA <BR>Fax: (608) 278-1475
<BR>E-mail: bradley@tess-inc.com <BR>Web Pages: <A
href="http://www.tess-inc.com/"
eudora="autourl">http://www.tess-inc.com</A>
and <A href="http://www.trnsys.com/"
eudora="autourl">http://www.trnsys.com<BR><BR></A>"Providing software
solutions for today's energy engineering projects"
<BR>****************************************************************************************<BR></FONT></I></P></BLOCKQUOTE></BODY></HTML>