[Radiance-openstudio] Solar Heat Gain Coefficient (SHGC) Calculations in OpenStudio's Coupled Radiance and EnergyPlus Simulations

Tue Mar 11 12:36:10 PDT 2014

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 <jss5237 at gmail.com>:

> 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 <
> germolinal at gmail.com> 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 <jss5237 at gmail.com>:
>>
>> 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 <
>>> germolinal at gmail.com> 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 <jss5237 at gmail.com>:
>>>>
>>>> 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
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> Radiance-openstudio at radiance-online.org
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>>>>>
>>>>
>>>>
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