jaklloyd's profile - activity

Every time I use the OpenStudio Results Measure, no matter which model I am using, the simulation always fails. Then when I try to remove the measure, the simulation won't run as it did before. No .err file is created.

The simulation reads the following after pressing 'run':

Initializing workflow. Processing OpenStudio Measures. Translating the OpenStudio Model to EnergyPlus. Processing EnergyPlus Measures. Failed.

For some reason the building component library has stopped downloading files from within the OpenStudio Application. When I click "Components and Measures" and then "Find Components" and access the BCL this way, whenever I select a material and click download, the loading bar just whirrs away forever. I can however download the zip file from the BCL website, but I don't know where to put this file so that I can access it in the OpenStudio Application. I tried pasting it into the ~/BCL folder but that did not seem to work.

Does anyone have any pointers? I'm a bit stuck without it!

Cheers

Thanks very much! That would be very useful! I downloaded the measure, however it seems to make my model crash for som

How do I view the total heat transfer coefficient through surfaces in OpenStudio/EnergyPlus? I would like to find out wh

I have been looking at the Envelope Summary in the Energy Plus Results for some of my models of domestic buildings and found that the ground floor u-value is very high.

The construction is a simple 10mm of Ceramic Tile and 150mm of Concrete and I would have expected it to be far lower than this. How does OS calculate the U-value? Does OS take into account the exposed perimeter of the floor when calculating this? If so, is there a way of setting the exposed perimeter as my models have party walls with buildings that are not drawn in the model.

Thanks

Surface 29 is a simple solid floor made of: 10mm of ceramic floor tile with a thermal conductivity of 0.8 W/mK 150mm of concrete with a thermal conductivity of 1.7296 W/mK

I have calculated the solid floor U-value using the CIBSE Guide A method and found the U-value to be 1.625 W/m2K. Please see the methods and calculations below.

(CIBSE Guide A)

(CIBSE Guide A)

@shorowit Thank you so much! Yes I was hoping that something similar was the case! Thank you so much for clarifying! A

@shorowit Thank you so much! Yes I was hoping that something similar was the case! Thank you so much for clarifying! A

How does EnergyPlus calculate floor U-values? I have been looking at the Envelope Summary in the Energy Plus Results for

How does EnergyPlus calculate floor U-values? I have been looking at the Envelope Summary in the Energy Plus Results for

Hi @shorowit, yes of course! Surface 29 is a simple solid floor made of: 10mm of ceramic floor tile with a thermal cond

I still have not been able to find out how EnergyPlus calculates this floor u-value, I am thinking that maybe I should t

@shorowit okay thanks

How does OpenStudio calculate floor U-values? I have been looking at the Envelope Summary in the Energy Plus Results for

@aaron boranian thanks, I have played around with the slab program now and have edited the example file to try to replic

@Eric Ringold Great, thanks very much!

Great, thanks very much!

I think I have figured out how to use slab, just about! So I think the answer to this is a heavy NO! As the temperatures

Hi @Luis Lara , I was just wondering if the Site:GroundTemperature:FCfactorMethod output temperatures that can be found

Can I use "Site:GroundTemperature:FCfactorMethod" as monthly ground temperature inputs for ground floor heat loss? I am

I would also like to know how to use the slab preprocessor to calculate ground temperatures as I cannot seem to get it t

@Aaron Boranian I would really like to be able to use the auxiliary slab program but I'm not sure how to do this? I'm n

@Eric Ringold THANK YOU SO MUCH! This has solved this issue with me as I am new to OpenStudio and cannot write measures

@Eric-Ringold THANK YOU SO MUCH! This has solved this issue with me as I am new to OpenStudio and cannot write measures

@ericmartinpe thanks very much, that's very helpful and gives me a way forward! It does seem like it will be very time c

For example I have a wall solid brick wall construction with a U-value of 2.214 W/m2K and I want to de-rate it by 0.15W/

Hi Aaron, thanks, I had seen that post and also this one which I think is the post with the spreadsheet tool mentioned i

How can I create a construction with a user input specific u-value? I am trying to model an additional 0.15W/m2K of heat

However, the external measurements will obviously change if I am installing external insulation all over my building env

Hang on. Sorry I thought this answered all of my confusion but I'm not sure if it has. I understand now that geometry

I am trying to use the OpenStudio Results Measure that is available on the BCL at https://bcl.nrel.gov/node/82918. I am trying to use this measure as it has been updated to include a choice to display results in SI units according to this thread - https://unmethours.com/question/15203/metric-reports-in-open-studio/.

I save the measure in the 'My Measures' directory but when I do so, using the measure in the GUI causes the simulation to fail. I do not know whether this is because it comes into conflict with the existing measure in the OpenStudio Application or for some other reason?

I can see when I remove the measure from the 'My Measures' directory, the symbol next to the reporting measure in the GUI changes from 'My' to 'BCL'.

When I have no measure in the 'My Measures' directory and the symbol in the GUI is 'BCL', then the simulation runs okay and the OpenStudio Results are displayed, but in Imperial Units. I do not know if this is a bug or (more likely) some kind of user error! Do I need to remove the original OpenStudio Results Measure from somewhere before I can use the OpenStudio Results measure found on the BCL?

Using OpenStudio Application 1.0 and core OpenStudio 3.0

Thanks, this has really helped me understand better how E+ conducts its simulations. I'm new (as you might have realise

If I draw a base model - say a 215mm thick solid brick wall terraced house, and then I want to run a simulation of the building with a hypothetical retrofit of 100mm of external solid wall insulation, will I have to then re-draw the geometry to make the sketchup drawing match?

I say this because the surfaces in OpenStudio are 2D and should represent the external face of the building - not the internal face. This would therefore mean that if I simply changed the construction set to reflect an addition of 100mm of external insulation, OpenStudio would 'think' that this was inside the initial external measurement - essentially modelling moving the brick wall 100mm inwards and putting the insulation where the brick wall used to be.

Am I missing something here, or will I really have to change the geometry for each different external wall insulation thickness that I want to simulate?

Thanks,

Jack

Also - If you internally insulate the walls of a building, presumably that results in a reduction in the volume of air i

So am I right in thinking that the thickness essentially is only used to calculate a u-value, which is then assigned to

OpenStudio - If I change the wall construction to be thicker on a base model, do I have to also change the geometry to m

User error! Do not paste a copy of the OpenStudio Results Measure into the 'My Measures' folder when it is already stor

@DavidGoldwasser I'm very sorry for wasting your time. The real problem was that I didn't know how to properly use the