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

[Geissler Achim]

Hi Bart,
very interesting topic. By "between-the-panes" do you mean those "new" special products, where a Venetian type blind is in  the (sealed and desiccated) IGU gap or do you mean every type of glazing setup with blind in between glazing layers, e.g. the various "double façade" types (with and without natural / forced ventilation)?
I assume you are familiar with the corresponding ISO / EN standards 15099 and 13363-2. Additionally, especially interesting in regard to possible models in ESP-r, are you familiar with all the work done in this regard by ISE / Freiburg (part of the Fraunhofer Group; ESP-r user)? Quite a few publications are available; the name to look for here is Tilmann Kuhn.
As Jon can confirm, the above mentioned topic (if the latter, broader definition of between-the-panes) is very interesting for the façade industry. However, if you are making new models / approaches, the industry will heavily require comparisons to the accepted standardised approaches mentioned. And it will not pay  :^(  .
Looking forward to interesting developments,
best regards
Achim Geissler
> -----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
> 
> 
> 
> 
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