Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Julien Marrec's profile - activity

2018-07-25 09:51:04 -0500 answered a question Availability for two different systems: VRF and radiant floors

E+ 8.9.0 recently added a new field to the ZoneHVAC:EquipmentList, that is Load Distribution Scheme. This field isn't e

2018-07-25 09:36:46 -0500 edited answer Chiller curve and AHRI test condition.

This is just a warning to tell you that the min/max values for X/Y variables exceeds the limits defined from AHRI 551/59

2018-07-25 09:36:16 -0500 answered a question Chiller curve and AHRI test condition.

This is just a warning to tell you that the min/max values for X/Y variables exceeds the limits defined from AHRI 551/59

2018-07-25 05:03:50 -0500 answered a question Best method to define individual space properties

I don't think there's a way to tell OS to not use the SpaceType's load when you add your own load of the same type. Ins

2018-07-25 04:54:00 -0500 answered a question What does it mean by "No System Effects are accounted for"?

You want to read the Engineering reference, especially the sections Sizing Manager and Zone Design Loads and Air Flow Ra

2018-07-25 04:28:24 -0500 commented answer ZoneInfiltration:FlowCoefficient Open Studio

I think you supposed wrong here :) Airflow Network stuff seems to be wrapped in OpenStudio, see the SDK object list for

2018-07-24 10:30:10 -0500 answered a question ZoneInfiltration:FlowCoefficient Open Studio

You correctly found the two that are indeed available, but indeed ZoneInfiltration:FlowCoefficient is not wrapped in Ope

2018-07-24 06:52:20 -0500 commented question Problem in running simulation in OpenStudio and EnergyPlus

Like I said, the Fatal tells you there's something (reported before as a Severe) that it couldn't recover for. So fix th

2018-07-24 06:51:42 -0500 commented question Problem in running simulation in OpenStudio and EnergyPlus

Like I said, the Fatal tells you there's something (reported before as a Severe) that it couldn't recover for. So fix th

2018-07-24 04:00:00 -0500 commented answer Can someone please provide me the steps for openstudio installation in Ubuntu 16.04 ?

Ok, glad you found something that works. (For the record, I fixed this dependency problem recently, so if you try the la

2018-07-24 03:52:12 -0500 commented answer OpenStudio and EnergyPlus version numbers from OpenStudio SDK

(There's also OpenStudio::openStudioLongVersion which will append the build SHA to the version, eg 2.6.1.c8b48af2d6, but

2018-07-24 03:48:51 -0500 commented question Problem in running simulation in OpenStudio and EnergyPlus

To paste a snippet out of the eplusout.err, you can just copy and paste the text in your post, then use the "Code" funct

2018-07-24 03:45:33 -0500 commented question The cooling load of my facility is 217 kW. The coil load is 636 kW. How can I see the components of the coil load to verify that the sum of the [facility load + other loads] is 636 kW. I would like to know the other components of the coil load

If I could make a quick suggestion, since I start to see a pattern here: it'd be best if you could find shorter, clearer

2018-07-20 06:47:31 -0500 answered a question Sketchup/eQuest polygon coordinate exchange

Sketchup's API is exposed in Ruby, so you can indeed import your geometry, do stuff to it (normal Sketchup work), and sp

2018-07-20 06:41:19 -0500 commented question Why is the coil, chiller, tower oversized in Energy-Plus ?

There are a variety of sizing factors used throughout E+ that could lead to this. Hard to tell here with no information.

2018-07-20 06:39:07 -0500 commented question Problem in running simulation in OpenStudio and EnergyPlus

OpenStudio 2.5 and EnergyPlus 2.13??? 2.5 should be based on EnergyPlus 8.9.0. Anyways, please open the "eplusout.err" t

2018-07-19 05:29:36 -0500 commented question How can I link a CHP unit with a thermal loop in OS

You need to connect it to the supply side of your plant loop, and ensure you get an adequate PlantEquipmentOperation:Hea

2018-07-19 04:59:25 -0500 commented answer Infiltration Rate for Internal Zone?

Looks like it works indeed on this page now. Thanks!

2018-07-18 02:46:48 -0500 commented answer Suppose I have 100 variables calculated using Energyplus and I want to print the 100 in 10 CSV files, how may I achieve it ?

Jason, I'll answer on the Github Issue here

2018-07-18 02:24:31 -0500 commented answer radiant floor simulation ok but wrong output

This is not an answer, but rather a comment (or a new question)

2018-07-17 10:17:40 -0500 received badge  Necromancer (source)
2018-07-17 08:05:33 -0500 commented question There is a CSV file with a lot of columns. I want to extract the columns with the text "People Sensible Heating Rate" and export it to a csv file named "People Sensible Heating Rate" using PANDAS.

I'm closing this question. Be careful not to fall into a "please do my homework" type of situation, nor to confuse unme

2018-07-17 08:05:08 -0500 commented question There is a CSV file with a lot of columns. I want to extract the columns with the text "People Sensible Heating Rate" and export it to a csv file named "People Sensible Heating Rate" using PANDAS.

I'm closing this question. Be careful not to fall into a "please do my homework" type of situation, nor to confuse unme

2018-07-17 08:04:34 -0500 commented question There is a CSV file with a lot of columns. I want to extract the columns with the text "People Sensible Heating Rate" and export it to a csv file named "People Sensible Heating Rate" using PANDAS.

Be careful not to fall into a "please do my homework" type of situation, nor to confuse unmet hours with Stack Overflow.

2018-07-17 02:28:33 -0500 commented answer Why is hot water temperature in tank and the water use equipment different in openstudio?

And what's your output frequency? Use detailed. Also check out the Plant and water heater Unmet loads.

2018-07-17 02:25:58 -0500 commented answer Suppose I have 100 variables calculated using Energyplus and I want to print the 100 in 10 CSV files, how may I achieve it ?

Go upvote this issue please!

2018-07-16 16:56:05 -0500 received badge  Self-Learner (source)
2018-07-16 09:35:29 -0500 marked best answer Calling ReadVarsESO without the 255 columns limit

I'm using OpenStudio to simulate with EnergyPlus. I want to get a csv file out of it in order to do some post-processing.

As stated in the thread Getting csv from sql, one way to get the csv is to re-run the IDF file generated by OpenStudio through the EP-Launch program. But that would require running the simulation a second time, which I want to avoid.

OpenStudio does save the .eso file, and I can process it just fine using ReadVarsESO that comes with EnergyPlus. The only problem is that I'm getting this message

 ReadVarsESO program starting.
 too many variables requested, will go with first          255

Now, in EP-launch, if you go to Options, then "Miscellaneous", you can tick an option "Allow more than 250 columns", and you'll end up with a csv that has all the reporting variables, even if more than 250 or 255.

So I'm guessing there's a way to call ReadVarsEso with some kind of parameter that tells it to ignore the columns limit.

How can you run the ReadVarsESO without the 255 columns limit?

2018-07-16 03:11:24 -0500 edited answer Suppose I have 100 variables calculated using Energyplus and I want to print the 100 in 10 CSV files, how may I achieve it ?

Python and pandas would do that quite easily. This code will output as many csv files as needed regardless of your actua

2018-07-16 03:10:48 -0500 edited answer Suppose I have 100 variables calculated using Energyplus and I want to print the 100 in 10 CSV files, how may I achieve it ?

Python and pandas would do that quite easily. This code will output as many csv files as needed regardless of your actua

2018-07-16 02:58:40 -0500 answered a question Suppose I have 100 variables calculated using Energyplus and I want to print the 100 in 10 CSV files, how may I achieve it ?

Python and pandas would do that quite easily. import pandas as pd import numpy as np df = pd.read_csv('eplusout.csv',

2018-07-16 02:50:23 -0500 commented answer Regular Expressions to filter Output:Variable

@kwalkerman: added an answer to update the status of the thread + show examples as you requested. Thanks to @MarkAdams f

2018-07-16 02:49:42 -0500 answered a question Regular Expressions to filter Output:Variable

Support for regular expressions (regex) has been added by @MarkAdams in PR#6017, circa E+ 8.7. The I/O reference guide

2018-07-13 16:44:43 -0500 marked best answer Regular Expressions to filter Output:Variable

In the "Key" field of the Output:Variable, is there any way to wildcards (aside from "*" by itself), or even regular expressions?

Output:Variable, *, !- Key Value System Node Temperature, !- Variable Name hourly; !- Reporting Frequency

For example, I might want to output the System Node Temperature only for all nodes that contain either 'DOAS' or 'DHW'. Is that possible?

2018-07-13 02:52:36 -0500 commented question What is the possible reason for "Failed to add measure: Failed to add measure to the project"?

Probably that measure.xml was conflicted. Like duplicate uuid compared to another measure, or wrong version etc.

2018-07-12 02:24:09 -0500 commented question What is the possible reason for "Failed to add measure: Failed to add measure to the project"?

Does your measure have a broken red icon next to it? Means the measure code isn't valid.

2018-07-02 10:27:05 -0500 received badge  Popular Question (source)
2018-06-27 16:06:32 -0500 edited answer export .IDF from OpenStudio to Energy plus (EP-launch)

You can't. ForwardTranslation (OSM -> IDF) works, but ReverseTranslation (IDF-> OSM) works only for a very limited

2018-06-27 16:05:21 -0500 answered a question export .IDF from OpenStudio to Energy plus (EP-launch)

You can't. ForwardTranslation (OSM -> IDF) works, but ReverseTranslation (IDF-> OSM) works only for a very limited

2018-06-27 09:12:56 -0500 commented answer R-value EnergyPlus?

Should be a comment rather than an answer :)

2018-06-26 11:24:35 -0500 marked best answer What is the (Current) State of the OpenStudio Radiance Measure?

Searching for documentation

  • I went through the official user documentation which is really short, only these two documents: Radiance Tutorial and Radiance Reference Guide.

  • I pretty much went through all the Youtube videos I could find on NREL’s channel about Radiance (a list is here)

  • I also looked at quite a few questions about daylight and openstudio on UnmetHours.

Yet I still have many questions and/or concerns about the Radiance Measure.

I know this isn't the original intent of UnmetHours, but I feel like a global post (like community wiki) would be helpful, so pardon me for asking multiple things in this thread.


What is the current state of the OpenStudio Radiance Measure and what can we expect going forwawrd?

  • I read in this question that there is zero truth reporting at the end of the perimeter zone since the boundary is opaque. How should we place the illuminance map regarding the exterior walls?
  • Can you place a non-rectangular illuminance map? In Sketchup Plugin it seems you can't. If not, how do you deal with non rectangular spaces?
  • Is there any measure that would add an illuminance map to all spaces or do you have to do it manually? (Seems like this would be very doable to create one using the SDK...)
  • Will Dview eventually support visualizing the illuminance map results, or are we stuck installing Results Viewer from OpenStudio 2.2.0 for that?
  • Radiance Measure calculates sDA, but does the Radiance Measure calculate the ASE metric? (required by LEED).
  • Given the fact that Sketchup Make is apparently turning into a web application with no plugins at the moment (and no communication from Trimble about when/if plugins will be available), is there any other way to place Radiance-aware components onto your geometry? (Having to create geometry in an old OpenStudio version with Sketchup 2017 would be a major problem, since upon updating your model to a newer OpenStudio version you wouldn't really be able to go backwards to your old OS Sketchup Plugin to do ulterior modifications...)
2018-06-26 09:02:29 -0500 commented question Indoor Pool using EnergyPlus

** Warning ** SizePlantLoop: Calculated Plant Sizing Design Volume Flow Rate=[0.00] is too small. Set to 0.0 ** ~~~

2018-06-26 08:50:12 -0500 commented question OS:Boiler:HotWater not working with cubic curves

You wrote that comment while I was in the process of writing my answer (I didn't steal it, promise!), glad you figured i

2018-06-26 08:47:00 -0500 answered a question OS:Boiler:HotWater not working with cubic curves

Please fill out the "Efficiency Curve Temperature Evaluation Variable". As you can see in ForwardTranslateBoilerHotWater

2018-06-26 06:36:30 -0500 commented answer Naming convention for arguments in osw file

C:\openstudio-x.y.z\bin if using version >= 2.0.0. C:\Program Files\OpenStudio x.y.z\bin if using 1.x

2018-06-26 06:34:30 -0500 edited answer Parametric Analysis Tool: material properties' change will remain?

A design alternative in pat is as follows: Seed model + configured measure(s) => new model => IDF => Results