If the VB model does not work for you, you can allways dynamically modify the BSDF by using the EnergyManagementSystem (EMS).
EnergyPlus calculates the SHG through a CFS by passing the beam radiation through the BSDF you define in the IDF file. The diffuse radiation, I understand, is averaged. Calculating SHG using Radiance is something I would like to know of! if you find anything, let me know. THANKS Germán 2014-03-11 16:06 GMT-03:00 Justin Shultz <[email protected]>: > I've heard some things about Radiance solar heat gain calculates but > haven't found any papers on how to integrate it within a whole-building > simulation yet, I'll keep looking. If anyone knows of a source it would be > extremely helpful. > > EnergyPlus does have a nicely integrated venetian blind module, but > unfortunately that doesn't exactly represent the system we're attempting to > model. My project is similar but a bit more complicated in practice, > although it does also block direct beam, I'll need to think if this is > representative. We were imagining, creating a defined number of geometries > (representative of dynamic states), create the BSDF for each, and then > chose between them for various states of the annual daylight > simulation.Following > the three-phase method, with the integration of results in a whole-building > simulation. > > From your suggestions, it appears as though the best solution to calculate > the solar heat gain would be to integrate a BSDF in EnergyPlus. Use E+ to > calculate the solar heat gain and then use Radiance (with OpenStudio) for > the Daylight and Lighting Load simulations. Though I'm guessing that > EnergyPlus cannot handle dynamic BSDFs for various CFS configurations > without some form of co-simulation. I'll have to read more into the methods > EnergyPlus uses to calculate the solar heat gain from a BSDF and determine > if that meets my criteria. > > Does anyone know of any articles or publications that discuss advanced > methods for integrating Radiance daylight and heat gain into whole-building > simulation from dynamic fenestration systems? Maybe I'm looking at the > problem from the wrong perspective. > > Thank you German, I look forward to receiving your thesis. I watched your > SketchUp plug-in video earlier, very cool stuff. > > Sincerely, > Justin > > > On Tue, Mar 11, 2014 at 2:33 PM, Germán Molina Larrain < > [email protected]> wrote: > >> Although I have heard some things about calculating solar heat gains with >> Radiance, I do not think OpenStudio does that... I did not do that, at >> least. >> >> EnergyPlus allows modelling simple glazing, Venetian Blinds, shades and >> other shading devices, and also inserting the BSDF of a CFS, and it will >> calculate the solar heat gains. My understanding is that the BSDF-based >> modelling of a CFS will be accurate enough for performing the >> calculation... maybe Radiance would be better for more complex handling >> geometries and materials though. >> >> I also understand that VenetianBlinds, as defined in EnergyPlus, allow >> you to choose a "block beam radiation" algorithm. I guess that, from that, >> you can report the VB position, and perform the lighting simulation in >> Radiance, and choose the artificial lighting power for the luminaires, and >> write them down in a schedule. Finally, you can go back to EnergyPlus, and >> use the lighting power, and use it to control the internal gains caused by >> the artificial lighting. *THIS WOULD BE VALID FOR THIS CASE. In my >> thesis you might find how to do it with some other kind of shading device.* >> >> >> I will attach my Thesis directly to you later. >> >> Bye! >> >> Germán >> >> >> 2014-03-11 15:11 GMT-03:00 Justin Shultz <[email protected]>: >> >> Hello German, >>> >>> Thank you for the quick reply. Yeah, that's my understanding of the >>> daylight contributions and the mkschedule.rb code. The part that I >>> don't understand is if the OpenStudio simulation of Radiance andEnergyPlus >>> calculates the new solar heat gain (of the CFS) using Radiance >>> or EnergyPlus, if at all. >>> >>> Let's use a dynamic venitican blind as an example, ones that track the >>> sun's altitude. The intercepted solar irradiance will block some direct >>> sunlight and solar heat gain. The part I'm unclear about is how to >>> implement (if it's not already) the interception of solar heat gain from >>> directly entering the thermal zone modeled in EnergyPlus. If OpenStudiodoes >>> this already, maybe I'm just missing it and someone can point me in >>> the right direction. If it doesn't, is there a tutorial that goes over >>> Radiance daylight and solar heat gain simulations and how they plug into >>> EnergyPlus. Also, the limitations of using said method. >>> >>> If you don't mind sharing, I think your thesis would be very helpful in >>> understanding how to apply thermal and daylight simulations to an >>> EnergyPlus simulation. >>> >>> Thank you, >>> Justin >>> >>> >>> >>> On Tue, Mar 11, 2014 at 1:57 PM, Germán Molina Larrain < >>> [email protected]> wrote: >>> >>>> Justin, >>>> >>>> What do you mean with "transforms the solar heat gain"? The last thing >>>> I heard is that OpenStudio uses Radiance to calculate the Daylight >>>> contribution, and choose the Artificial Lighting power in each zone, using >>>> a script called MKSCHEDULE. EnergyPlus, then, will have to calculate >>>> Solar Heat Gain by itself, and the luminaire power will be defined >>>> from a Schedule created with the MKSCHEDULE script. >>>> >>>> On the other hand, I worked on that topic during my M.Sc. Thesis, >>>> working with integrated Thermal and Lighting simulations of spaces with >>>> controlled Luminaires and Complex Fenestration Systems. I used Radiance >>>> and EnergyPlus, but no OpenStudio. You (and anyone) can ask me for my >>>> thesis, or related information. >>>> >>>> I wanted to contribute to OpenStudio, but my programming skills and >>>> lack of time did not allow me. >>>> >>>> Bye! >>>> >>>> Germán >>>> >>>> >>>> 2014-03-11 14:42 GMT-03:00 Justin Shultz <[email protected]>: >>>> >>>> Hello Radiance and OpenStudio users and developers, >>>>> >>>>> I'm new to the radiance and daylight simulation. Sorry if this is a >>>>> basic >>>>> question. I have used EnergyPlus for many basic projects, but my most >>>>> recent >>>>> one is studying a dynamic glazing system. My partner and I have >>>>> determined >>>>> that the three-phase method is probably going to be our best option. >>>>> We're >>>>> looking to model the effects the dynamic glazing system would have on >>>>> the >>>>> electrical lighting loads, as well as, the solar heat gain into the >>>>> building >>>>> zone. >>>>> >>>>> I've been reviewing the tools and methods at are currently available >>>>> to do >>>>> this and found "Challenges of Integrated Daylight and Electrical >>>>> Lighting >>>>> Simulation Methods in a Whole-Building Energy Simulation Context" by >>>>> Rob >>>>> Guglielmetti to be tremendously helpful. OpenStudio appears to be one >>>>> of the >>>>> most integrated and streamline options available for coupled daylight >>>>> and >>>>> whole building simulation. >>>>> >>>>> The question I have, that I haven't been able to find, is whether the >>>>> OpenStudio coupled Radiance and EnergyPlus method transforms the >>>>> solar heat >>>>> gain? The daylight is well studied and discussed, but I haven't been >>>>> able to >>>>> find out whether this method will discount the solar heat gain >>>>> through the >>>>> fenestration systems. >>>>> >>>>> Additional side question: When running genBSDF is there a command or >>>>> something material property that needs to be added to get the factors >>>>> for the >>>>> SHGC? We have only been able to get the daylight coefficients. >>>>> >>>>> Thank you for your help, >>>>> Justin Shultz >>>>> PhD Student >>>>> >>>>> >>>>> _______________________________________________ >>>>> Radiance-openstudio mailing list >>>>> [email protected] >>>>> http://www.radiance-online.org/mailman/listinfo/radiance-openstudio >>>>> >>>> >>>> >>>> _______________________________________________ >>>> Radiance-openstudio mailing list >>>> [email protected] >>>> http://www.radiance-online.org/mailman/listinfo/radiance-openstudio >>>> >>>> >>> >>> _______________________________________________ >>> Radiance-openstudio mailing list >>> [email protected] >>> http://www.radiance-online.org/mailman/listinfo/radiance-openstudio >>> >>> >> >> _______________________________________________ >> Radiance-openstudio mailing list >> [email protected] >> http://www.radiance-online.org/mailman/listinfo/radiance-openstudio >> >> > > _______________________________________________ > Radiance-openstudio mailing list > [email protected] > http://www.radiance-online.org/mailman/listinfo/radiance-openstudio > >
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