rafael.alonso's profile - activity

Thanks Denis - I did play around with the Equivalent Layer model back then, but never managed to get interior surface te

Does E consider interior shading when calculating radiant temperature? Hi all, I'm just re-opening this 5 year old top

Hi Denis, thanks for the note. I see it is unfortunately still open. Hopefully it gets some priority if enough people fi

Does E consider interior shading when calculating radiant temperature? Hi all, I'm just re-opening this 5 year old top

Does E consider interior shading when calculating radiant temperature? Hi all, I'm just re-opening this 5 year old top

Does E consider interior shading when calculating radiant temperature? Hi all, I'm just opening this 5 year old topic

Hi all,

I have stumbled upon a very strange case working with Energy plus.

I have a perfectly functional IDF that runs in E+ 23.1, but when I delete two Shading:Building:Detailed objects the simulation crashes and leaves the error log half way through.

Has someone encountered something similar?

You can find the idf files here - https://atmoslab.egnyte.com/fl/WbP8OK...

Thanks in advance, Rafael

Hi all,

I´m working on the thermal analysis of a wintergarden, made of polycarbonate with an internal shading that deploys depending on the temperature.

Is the operative temperature calculated with the temperature of the shading material, or with the temperature of the polycarbonate roof? I don´t see many changes between both options, and I guess it should make a difference.

Thanks,

Rafael

Hi @MJWitte, it's been a while since we discussed this issue. Do you know if there have been any updates on the Operati

Eliminating ShadingBuilding object crashes simulation Hi all, I have stumbled upon a very strange case working with Ene

Hi @joshkpeterson :) I never managed to convert it myself, we ended up working with @joe huang to get it done

Hi @joshkpeterson :) I never managed to conver it myself, we ended up working with @joe huang to get it done

Thanks for the detailed reply. When you say because the interior solar distribution algorithm is not able to model the

Thanks for the detailed reply. When you say because the interior solar distribution algorithm is not able to model the

we just ran the model changing the solar distribution to "FullInteriorAndExteriorWithReflections" and the temperature su

good question, I just realised it is FullExterior - we are making a test with Full Exterior and Interior and I'll report

Solar gain distribution between zones in Solar enclosures (Construction: Airboundary) Hi all, Does anyone know how the

Hi all,

I´m trying to get Radiance´s tool adduvf.exe to work, as it was developed to bypass Energyplus limitation with non-convex zones for the FullInteriorExterior solar distributions. The software was meant to read the idf geometry, compute View factors, and write them back in the idf - I suppose that using the Zoneproperty:UserViewFactors:bySurfaceName.

Investigating the tool with Radiance developers here , it seems it was written for IDF 7.x versions, and does not work with IDF versions 9.X.

Does anyone know how to downgrade an IDF file from 9.x to 7.x? Or any other work around this issue?

So far it encounters an error related to the geometry syntax:

There are some more details on Radiance forum.

Thanks, Rafael

thanks again @rraustad. Ok, so I see a Meter:Custom can group different simulation outputs. However, which is the right

thanks again @rraustad. Ok, so I see a Meter:Custom can group different simulation outputs. However, which is the right

thanks again @rraustad. Ok, so I see a Meter:Custom can group different simulation outputs. However, which is the right

Output for Coil:Heating:Water consumption/rate Hi all, I'm looking for the right output to see the hourly heating rate

I didn't know about this meter definition file, thanks! How can I edit on which meter an object is? Image added to the

Output for Coil:Heating:Water consumption/rate Hi all, I'm looking for the right output to see the hourly heating rate

HVAC simulation crashes during sizing Hi all, I am simulating a large model with a central boiler plant room which feed

The 3-4K difference was in hourly temperature. We just realised we were comparing Zone Operative to Ambient air recordin

Hi Aaron, Kiva has been on my to-do list for a while, but I never manage to make time and get my hands on it. Since we h

How to get indoor temperature for basement pre-processor? Hi all, I'm using the basement preprocessor to model the grou

Hi all, Are the options above still the go-to solution for version control in Energy modelling? I'm looking to implemen

Hi all,

I am opening a large thermal model of some 140 zones in Openstudio App (1.2) and when I go to the Thermal Zones tab it looks empty. It does try to load and the window sliders appear, but nothing shows in the main panel (see image below)

I know the zones are in the model because they appear on the Thermal Zone list under the HVAC systems and Geometry Tab.

I have tried with several exports for the same model from Honeybee, but they all cause the same issue. This doesn't happen to other smaller models I have tried, where the Thermal Zones tab loads as usual.

Does anyone know what could be causing this? I am also attaching the OS file for reference - https://we.tl/t-B3ACzY8MJN.

Thanks, Rafael

Brilliant - that works. Thanks!

Empty Thermal Zone tab in Openstudio? Hi all, I am opening a large thermal model of some 140 zones in Openstudio App (1

Hi Gabriel, Thanks for the detail answer - this is very helpful. We rarely require this level of detail in projects, b

Hi all,

I'm working on the effect of varios materials on the humidity levels inside a room. Aside from the impact of their thermal conductivty and specifc heat, I'm looking into the hygroscopic properties of natural materials [adobe, compressed earth blocks] in comparison to concrete and bricks.

To account for the vapour absorption/release of the walls, I'm working with moisture transfer calculations between the walls and the indoor air in EnergyPlus, I'm using the EPMD model (MoisturePenetrationDepthConductionTransferFunction) and in order to assign the hygroscopic properties to the materials, the MaterialProperty:MoisturePenetrationDepth:Settings object.

MaterialProperty:MoisturePenetrationDepth:Settings,
Gypsum,                  !- Name
6,                       !- Water Vapor Diffusion Resistance Factor {dimensionless}
0.0068,                  !- Moisture Equation Coefficient a {dimensionless}
0.939,                   !- Moisture Equation Coefficient b {dimensionless}
0.0202,                  !- Moisture Equation Coefficient c {dimensionless}
12.2,                    !- Moisture Equation Coefficient d {dimensionless}
0.019,                   !- Surface Layer Penetration Depth {m}
0.073,                   !- Deep Layer Penetration Depth {m}
0,                       !- Coating Layer Thickness {m}
0;                       !- Coating Layer Water Vapor Diffusion Resistance Factor {dimensionless}*

Unfortunately, beyond the material properties specified in the MoistureMaterials.idf dataset that comes with EnergyPlus, I'm finding it very difficult to find the required properties for any other material (in my case earth-based constructions).

Does someone around here know any reliable material database where to find the hygroscopic properties of materials? If it contains earth-based construction would be fantastic! Unfortunately, I'm not an expert on physical properties and some of the terms are a bit abstract.

So far, the most complete databases I've found are below. However, there is no mention to earth-based constructions, and the terms they provide for Hygric properties do not seem to find with the inputs required in E+.

http://www.iea-ebc.org/Data/publicati...

http://www.iea-ebc.org/Data/publicati...

Many thanks!

Rafael

Shading and window operation based on Operative Temperature Hi all, Currently the E+ objects for ShadingControl and Nat

Shading and window operation based on Operative Temperature Hi all, Currently the E+ objects for ShadingControl and Nat

Thanks for the details Mark! I'll make some tests with a GPU I can borrow and report back.

Sounds interesting, specially if it can be used without any strong coding experience. Rafael

Sounds interesting, specially if it can be used without any strong coding experience. Rafal