.Is any relation between Daylighting Simulation(using RAD material) and Energy Simulation(using EP Material)?

Hello , Im Interior Archtecture Student now . And new at daylighting, energy simulation using honeybee.

First, Really appreciate for this wonderful program, honeybee.
It is very awesome for me!! :grin::grin:

And I have some several question about honeybee’s simulation.

1. Is there any relationship between RAD Material and EP Material?

I want to simulate Energy(annual Energy Consumption) , Daylighting(UDI) at the same time to check the difference of using different interior finishing material. So I combine the simulation process in grasshopper! But Actually there was no effect in Energy simulation result , when I changed RAD Material. And no effect in UDI result too, when I changed EP Construction’s EP Material.
I thought there was difference between RAD and EP by their constitution of value.
But I really need the relationship RAD and EP. So I want to test SAME INTERIOR FINISHING MATERIAL to simulate Energy , Daylighting at the same time.
I want to check the result of UDI , Energy Consumption when I changed only interior Material.

If there is no relationship between these material, how can I get useful result?
there is a small,rough finishing Materials in EP Material (except insulation material) like 1/2IN GYPSUM , 1 IN STUCCO , 8 IN CONCRETE HW , and there is specific material name in RAD Material like Oak wood , Grain wood ,etc(I downloaded them here http://www.artifice.com/radiance/rad_materials.html).
Can I get some useful result when I set EP Material (I mean Interior finishing material) like G05 25MM WOOD and use different kinds of wood material in RAD Material?

If the method above I said was not good way to get useful result, could you please tell me something useful way to solve this problem?

2. How can I get material’s texture (like bump image) that I using in simulation ?
I found .pic file in rad material library. But there is so small example in there.
I want to get various material’s texture information… How can I get?

Again, really thank you for this wonderful program.:grinning:

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@kiHoon ,

The two types of materials (Radiance and EnergyPlus) are deliberately separate from one another. This is in line with a general philosophy that we have applied across the plugins: “explicit is better than implicit.”

So, if you would like the two types of materials to be related to one another, you have to explicitly use the same reflectance/transmittance values when you create the Rad materials and EP constructions that you assign to the zone.

If you take a look at the honeybee_EnergyPlus Opaque Material component, you will see that there are two inputs that relate to Radiance simulations: solar absorptance (solAbsp) and visual absorptance (visAbsp). Depending on whether you are running a Radiance daylight/illuminance simulation or a Radiance radiation simulation you will want to either match the visual absorptance to the or the solar absorptance respectively to the Radiance material. You can get the Radiance material that you need by plugging (1 - absorptance) into the reflectance inputs of the Honeybee_ Radiance Opaque Material

Thanks for answer Chris ! :slight_smile:
And really helpful your answer and your tutorial video in youtube too.

Actually when I did this process that integrate space daylight/illuminance and energy simulation I felt that it was separate.

But I want to test integrating space daylight/illuminance and energy simulation using same interior texture ( Same Construction ) because in real world I think it is usual case.

If I do that following your advise , is it inaccurate result? (using EP material’s solAbsp -> RAD material’s reflectance<r,g,b> )

EP RAD material test.gh (475.1 KB)

This an example I made for testing integrated simulation.
In the example file , I want to check interior wood material variance.
So I set the EP constructions’s third material to 25mm WOOD , and used 25mm WOOD’s property to make rad material. And change the rad material.

here is my question.

  1. I think there is a difference about UDI and energy when we used teak wood or beech wood for interior material (final texture). but in this example, there was no difference between the woods in energy simulation(there is a difference in annual UDI simulation)
    Is this difference negligible in integrated simulation?

  2. I wan downloaded RAD material in a http://www.artifice.com/radiance/rad_materials.html
    But there is no value roughness , and specularity in this RAD material.
    In above example file, is it correct method for integrated simulation?
    And is there other RAD library I can use including roughness and specularity or other useful values?

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