[esp-r] Re: Proposed development of window shading models

[Pueltz, Gunter]

Bart,

a short info concerning transmission and absorption of each layer of a tmc:

The European software "Advanced Window Information System (WIS)", 
Version 3.0.1, des Window Energy Data Network (WinDat), coordinated 
by TNO Building and Construction Research (TNO Bouw), Department: 
Sustainable Energy and Buildings (DEG), The Netherlands (details 
see http://windat.ucd.ie/wis/html/index.html)

is able to calculate both the overall transmission as well as the absorption
in each layer of a facade WITH venetian blinds as a function of sun altitude
angle (this is the "profile angle" you suggested). The WIS software is
similar
to the WINDOW-software from LBNL, but also treats venetian blinds. 
Therefore you should use the software WIS for the enhanced window model in
ESP-r ...
An interface between WIS and ESP-r would be a great help for ESP-users !!

But also WIS shows a crued defect: It is NOT able to take the azimuth angle
of
the sun into account. A recent work from Mr. Kuhn, Fraunhofer-Institute of
solar
energy systems in Freiburg, Germany, has shown, that this defect may yield -
at critical
sun angles - to an underestimation of solar heat gain of appr. 100% !!!!!!!
Therefore it would be the best - for my opinion -, if the new enhanced
facade model
(glazing AND blinds) takes into account ALL relevant angles:
- the slope angle of the blinds
- the sun heigt angle (or the profile angle)
- the sun azimuth angle
Concerning this topic, Mr. Kuhn has developed a new, enhanced algorithm (I
assume
based on raytracing), which considers all these angles. Please see

1) Tilmann E Kuhn, Solar Control: A general evaluation method for facades 
with venetian blinds or other solar control systems, Energy and 
Buildings, 38 (2006), 648-660.

2) Tilmann E Kuhn, Solar Control: Comparison of two new systems with the 
state-of-the-art on the basis of a new general evaluation method for 
facades with venetian blinds or other solar control systems, Energy and 
Buildings, 38 (2006), 661-672.

You can also find more information about this new algorithm at the
IBPSA-Germany
website at http://129.187.44.165/konferenz/paper/2006/108.pdf

I propose that you contact Mr. Kuhn directly, because he has already told
his
willingness to support or even participate the code enhancement of ESP-r.
His contact data are following:

Dipl.-Phys. Tilmann E. Kuhn
Head of Group Solar Facades and Durability Analysis
Dept. Thermal Systems and Buildings
Fraunhofer Institut für Solare Energiesysteme ISE
Heidenhofstr. 2, 79110 Freiburg, Germany
Phone: +49 (0) 761/ 4588-5297  Fax: +49 (0)761/ 4588-9297
tilmann.kuhn at ise.fraunhofer.de
http://www.ise.fraunhofer.de 

As a stupid ESP user I would appreciate it greatly if all experts for facade
modelling
cooperate for the enhancement of facade modelling in ESP-r  ....

Regards,
Gunter

--
Dr. Gunter Pültz

Müller-BBM GmbH
Robert-Koch-Straße 11
82152 Planegg
Telefon +49(89)85602-336
Telefax +49(89)85602-111
http://www.MuellerBBM.de    

HRB München 86143
Geschäftsführer: Bernd Grözinger, Dr. Edwin Schorer, Norbert Suritsch





> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk
> [mailto:esp-r-bounces at lists.strath.ac.uk]On Behalf Of Bart Lomanowski
> Sent: Monday, March 19, 2007 3:45 PM
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: Proposed development of window shading models
> 
> 
> 
> Thanks for all the feedback, I appreciate the interest this 
> subject has 
> generated. 
> 
> I've attached some ppt slides outlining in more detail our 
> model capabilities, 
> the ESP-r development proposal in broad strokes, and some 
> implementation issues 
> for discussion. What I am most interested in is the 
> capabilities of other 
> ongoing developments (e.g., SHOCC) and the expected 
> interactions of these 
> facilities with transparent constructions. Ideally I would 
> like to retain 
> generality with respect to the window shading developments to ensure 
> functionality with other windows related projects. I hope a 
> brief discussion 
> will be possible at the Developer's conference to shed some 
> light on this. 
> 
> Thanks,
> 
> Bart Lomanowski
> University of Waterloo
> 
> 
> 
> 
>