[esp-r] Re: Calculation of solar gains through complex shading devices

[Geissler Achim]

Dear German

basically, that is a very interesting idea. However, I would not expect this to be easy and straightforward, as one strength of ESP-r is that it solves all the physics simultaneously. Currently, there are two possible ways to include complex shading: The "CFC" model for multi-layer constructions (to date, this covers venetian type blinds, roller blinds and meshes are "in the works" as far as I am aware) and the input of  bi-directional reflection / transmission input data ("BRTD") - here the problem is basically generating the necessary input data, however this may be possible via Window 7 (LBNL), now.

ESP-r can basically take the solar distribution on the surfaces of the zone behind the window into account. In the mainstream code, the CFCs lack daylighting, however. I am not sure what the situation in this regard for the "BRTD"-type of models is.

As far as I am aware, the three-phase-method and the "coupling" with EnergyPlus requires two runs? Could you describe the necessary workflow / calculation steps? Where / in which program is the setting of a Venetian type blind set, for example? Based on what?

Best
Achim



Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Germán Molina Larrain
Gesendet: Dienstag, 7. Mai 2013 01:07
An: esp-r at lists.strath.ac.uk
Betreff: [esp-r] Calculation of solar gains through complex shading devices

Hello,

I am German Molina, and I am doing my MSc. on complex shading systems, and how to treat them for simulation purposes (Lighting and Solar Heat Gains). I do not really use ESPr or any other thermal simulation tools, just Radiance for now.

Finished my literature review, I realized that one method used for lighting (the Three-phase method) might be good to be a good estimator of the Solar Heat Gains through complex fenestration systems... later I found out that some people did this, and actually nowadays something very similar can be implemented in EnergyPlus.

Long story short, I think (it is waiting for a validation) that I can accurately calculate the Solar Heat Gains through virtually any complex fenestration system of known BSDF matrices; and not only net solar heat gains, but I think I can also say where the solar radiation is going (calculate the fraction that goes to the ceiling, to the floor, etc.). How difficult would it be to use this output as an input for ESPr? For what I understand, ESPr does not handle very well these kind of systems?

What I am proposing can be actually reduced to just one phrase: Lets use Radiance to what it does best (radiation transport) and ESPr to what I think it does best (Thermal simulation).

THANKS VERY MUCH

German Molina
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