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

[paul strachan]

Message to esp-r list from Gunter Pueltz: Gunter.Pueltz at MuellerBBM.de

Publications referred to are:
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.
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.
------------------

Hello Bart,

for your information (and all other, who are interested in solar heat gain):

At the Fraunhofer Institute ISE in Freiburg, Germany, Mr. Tilmann Kuhn has
developed a very detailled and more accurate algorithm for the determination
of the effective solar heat gain - especially for venetian blinds. This
algorithm takes into account angle dependancies (of sun and blinds) as well
as spectral distributions (see attached publications) .....

These infos might be helpfull for you ....

Moreover - as a stupid user of ESP-r - I propose a cooperation between you 
and Mr. Kuhn in enhancing current facilities of ESP-r concerning the
calculation 
of solar gain for facades with venetian blinds. Such a cooperation of
specialists
for further development of ESP-r enhancements would help all users of ESP-r
.... 

Best Regards,
Gunter Pültz

--
Gunter Pültz

Müller-BBM GmbH
Robert-Koch-Straße 11
82152 Planegg
Telefon +49 (0)89 85602 - 336
Telefax +49 (0)89 85602 - 111
http://www.MuellerBBM.de 

> > -----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 12, 2007 4:29 AM
> > To: esp-r at lists.strath.ac.uk
> > Subject: [esp-r] Proposed development of window shading models
> > 
> > 
> > Hello All,
> > 
> > In response to Jon's reply...
> > 
> > I am a Master's student at the Solar Thermal Research Lab at 
> > the University of 
> > Waterloo. Our group has developed window shading models 
> > focusing on the 
> > accurate treatment of venetian blinds in glazing systems. 
> > 
> > The models essentially extend a standard center-glass glazing 
> > analysis to add 
> > venetian blinds of arbitrary geometry, slat angle and 
> > position within the 
> > glazing system. The analysis is based on calculating 
> > spatially averaged, or 
> > effective solar optical and longwave properties for a shading 
> > layer given a 
> > specific geometry and slat surface reflectance. A multi-layer 
> > solar optical 
> > analysis determines the absorbed, transmitted and reflected 
> > components of 
> > incident beam (off-normal) and diffuse solar radiation. Next, 
> > a heat transfer 
> > analysis, including the absorbed solar radiation terms, 
> > determines all the 
> > radiative and convective fluxes and layer temperatures. A convection 
> > correlation has been developed for a between-the-panes 
> > venetian blind. 
> > 
> > Proposed ESP-r development:
> > The development, still in the early stages, aims to create an 
> > "advanced glazing 
> > systems" facility giving the user the freedom to specify any 
> > glazing/shading 
> > arrangement . The optical properties for glazing/shading 
> > systems would be 
> > calculated based on the insolation data per time-step, 
> > allowing for accurate 
> > solar energy accounting. Convective and radiative heat 
> > transfer across air gaps 
> > would be treated in more detail than the current air gap resistance 
> > approach.    
> > 
> > These models will pave way for the development of intelligent 
> > automated blind 
> > systems. 
> > 
> > The method of implementation is still in the early stages so 
> > there is still 
> > uncertainty about code interventions at this time. I 
> > anticipate that the 
> > subroutines MZSLGN, MZCOE1 and MZSETU will require extensive 
> > work, however, the 
> > plan is to create new subroutines for handling advanced 
> > glazing systems.
> > 
> > I look forward to discussions on the subject.
> > 
> > Regards,
> > Bart Lomanowski
> > 
> > 
> > 
> > 
> >