[TRNSYS-users] Other buildings shadows

[David Bradley]

Masoud,
   The building model (Type56) does not automatically take into account 
shading of the building either by itself or by surrounding objects. There 
are, however, other models available that do just that. Type68 is designed 
to calculate the shading on a facade by an external mask (surrounding 
objects or by the building itself). Type34 is designed to calculate the 
effect of wingwalls and overhangs on a facade. In both cases, you pass the 
unshaded radiation from your weather reading component (likely Type109 
or  Type15) to the shading component and the results of that component on 
to the building. Having written the Type68 model (which you will need if 
you are working with a courtyard) I will be the first to admit that it is a 
pain to define the shading mask. Our company developed a plugin to make the 
specification a bit easier and the developers are working on a way for 
Type56 to calculate its own shading effects but this last is an enhancement 
anticipated for TRNSYS 17.
Cheers,
  David

At 07:52 2/16/2007, M.Malekzadeh wrote:
>Hi there,
>I am just starting to use TRNSYS and a very important factor for me to go on
>with this program is to be sure about its ability of considering the effect
>of other buildings on mine. When I tried simulating a very simple
>central-courtyard building (without any windows, any heating or cooling
>etc), after using Building Wizard to divide my building in 8 zones (4 on the
>sides of the courtyard and 4 on the corners) and running the simulation, I
>got exactly the same results for the air temperature in the 2 zones situated
>on my courtyard's north and south sides. This is kind of strange, because I
>would assume that the other three wings would produce some shadow on the
>northern one and therefore reduce the solar heat gain in there. But it
>didn't happen.
>So the only conclusion I can make is that while simulating different zones,
>TRNSYS treats them separately and not in relation to each other (apart from
>their adjacency effect of course). Is this true? Because if this is the
>case, I need to find another simulation program helping me in assessing the
>shadowing effect of other buildings as well as different parts of the same
>building.
>Thanks
>Masoud
>
>Masoud Malekzadeh
>PhD Student
>Department of Civil and Building Engineering
>Loughborough University
>Leicestershire, UK
>LE11 3TU
>
>Tel: +44 1509 223434
>Fax: +44 1509 223981
>E-mail: M.Malekzadeh at lboro.ac.uk
>
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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