O.S 3.6 crashes when creating design schedule When I try to create a design schedule (winter or summer) the application

Hello,

I'm sure there is something simple that I'm missing here. I'm trying to model a NECB 2015 code compliant reference building to compare with a new proposed building. I'm using openstudio 2.9. The proposed building is a mid-rise appartement building. We are currently evaluating the possibility to integrate air-to-air heat pumps to the project. I used the PTHP zone equipment to try to model this. I have no problem running the model with this equipment with default values and autosize. For the reference building I need to change the performance curves so that they respect NECB criteria. Here is my problem, most of NECB curves for the heat pumps are cubic like here:

But most of the PTHP curves inputs are quadratic or biquadratic like specified here for the DX heating coil.
What would be the approach to model these heat pump curves?

This is really interesting, thank you! I'm not really familiar with the SDK. I understand it's the documentations adn to

It's been a while since I used OS and E+ and I'm a little at lost with the latest versions of softwares. I understand there have been 2 releases for OpenStudio: One for the SDK by the NREL and one for the application by the Coalition.

If I understood correctly, OS 2.9 is the last release thats works with Sketchup Make 2017. The more recent versions work with different versions of Sketchup Pro. With a 2022 Sketuchup Pro licence I could use the O.S. Application 1.4 , O.S. SDK 3.4 and E+ 22.1

I don't use Euclid a lot, but I understand it could work with SketchupMake 2017 and EnergyPlus up to 9.5.

I just want to clarify, we went from E+ 9.6 to 22? As in a change of nomenclature for the year 2022? Or is it two branches of releases? Because I saw some pre-release of newer 9.6 on Github.

I'm re-writting here the comment of Denis and adding some interesting precisions by Tyryno so I can mark this question a

I remember reading something like that but then I wondered how to add and assign a new curve in OS. Is there a measure f

I did not realise that. Thanks for the heads up. Will give it a try!

NECB Heat pumps Performance curves Hello, I'm sure there is something simple that I'm missing here. I'm trying to model

Latest releases of softwares It's been a while since I used OS and E+ and I'm a little at lost with the latest versions

I had the same problem and used the same approach. I did not know how to validate if the random value I've used for UA w

I think the Zone HVAC:EquipmentList has been added to the SDK here. I'm really not that familiar with measure writing.

Process water heat reclaim modeling problem I am having difficulties modeling a heat reclaim for a process water loop. I

Have you try hard sizing your AirTerminal:SingleDuct:VAV:Reheat? You can set a maximum airflow and set the minimum air f

I also tried this approach and I can see that return or supply fan are not affected by the exhaust fan flow. However, it

I'd like some clarifications for the calculation of the heat exchanged through the core zone.

First, how is the area of the core zone determined? I don't see any input where we can define the distance between the perimeter and the core zone.

Second, it says in the documentation that the heat exchange in the core zone is calculated with the deep ground boundary condition. If I understand correctly this can either be set to zeroflux (adiabatic so no exchange) or groundwater (average of outside temp.).

However, it seems that EnergyPlus has a default value of 16°C for the deep ground temperature object. And this value remains no matter if I use the zeroflux or the groundwater deep ground boundary condition. Also I don't see much difference in the inside surface temperature or convection heat transfer rate. Since we can't output outside temperature or heat conduction loss for the ground surface I can't see any difference there neither.

So I'm wondering how is the heat exchange calculated for the core zone of the ground surface if I use the foundation:kiva object? Is there a way to influence these calculations such as defining the area of the core zone or the temperature in the ground?

I'm currently trying to calibrate a small plastic greenhouse with an insulated foundation. Kiva would potentialy represent the heat exchange of the perimeter with more precision. However, if I can't customize the heat exchange through the core zone, I'm thinking I might have more accurate results with other means. Like by letting the outside boundary condition to ground while modifying the Site:GroundTemperature:BuildingSurface for something in between the undisturbed ground temperature at 0.5m of the weather file and the temperature inside the zone.

Heat exchange calculation for the foundation:kiva core zone Hi! I'd like some clarifications for the calculation of the

When I run a simulation with OpenStudio I always get this warning in the .err file:

* Warning * GetHTSurfaceData: Surfaces with interface to Ground found but no "Ground Temperatures" were input. * ~~~ * Found first in surface=SURFACE 6 * ~~~ * Defaults, constant throughout the year of (18.0) will be used.

If my understanding is correct, the default value of 18.0 C will be used for the calculation of heat loss for a surface with oustide boundary condition set to "ground". This is kind of problematic in a region where ground temperatures are way below this default value.

What I don't understand is that there are data on ground temperature in the epw weather file. So I'm wondering why those are not read during the simulation.

Based on this question I've wrote an OpenStudio measure with wich I can manually set ground temperature for each month.

However, I'd like to know if there is a way to call the epw file and read the ground temperature so I would'nt have to do it manually for each simulation.

How to read ground temperature from epw file When I run a simulation with OpenStudio I always get this warning in the .e

I've removed the apostrophe from the weather files and it works fine thanks!

I'm using OpenStudio 1.9 to modelize a small passive greenhouse. When I choose the weather file for my location (found on the US department of energy website) , the simulation works just fine. But when I try to import the DDY file for the same location, the OpenStudio simulation fails and the OS report won't be generated, even though the EnergyPlus simulation was completed.

EnergyPlus Completed Successfully-- 8 Warning; 0 Severe Errors; Elapsed Time=00hr 00min 17.85sec

I've tried to run the simulation with another weather file and another DDY file and I don't have this problem. Can someone tell me what seems to be the problem with my DDY file? I found it here. The name of the file is Montreal Intl AP 716270 (CWEC)

Stderr file

Here's the content of the stderr file

DL is deprecated, please use Fiddle

C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/user_script.rb:155:in `eval': Optional not initialized (RuntimeError)

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:2087:in `block (2 levels) in design_day_table'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:2066:in `each'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:2066:in `block in design_day_table'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:2063:in `each'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:2063:in `design_day_table'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/resources/os_lib_reporting.rb:184:in `building_summary_section'

from (eval):1:in `block in run'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/user_script.rb:155:in `eval'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/user_script.rb:155:in `block in run'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/user_script.rb:153:in `each'

from C:/Users/ak35000/AppData/Local/Temp/OpenStudio.cY3576/resources/run/6-UserScript-0/user_script.rb:153:in `run'

from in.rb:387:in `<main>'

I'm using the sketchup plugin and openstudio 1.9 to modelize a passive solar greenhouse for a cold climate. The grenhouse is seperated in two thermal zones, a cold one (in blue) and a hot one in red). The hot section of the greenhouse has every outside suface insulated. The light first passes through the cold section of the greenhouse and then through an interior window to get to the hot section.

In order to create an interior window, I had to create two subsurfaces, one on each side of the interior wall. Same procedure as in this post. However, by proceeding like this, I obtain two adjacent subsurfaces when in fact I only want one window between the two spaces.Should I break the construction of the window in two and assigne one half to each subsurface or is there an other way?

I also wanna make sure that the light passes through this internal window and that the hot section of the greenhouse gets the heat gain from solar radiation. So I checked the output variable Zone Windows Total Transmitted Solar Radiation Energy when running the simulation for weather file run period. The results show me I have no gain in the hot section. This makes sense considering this output variable sum only the exterior window according to EP documentation. Is there a way to obtain the transmitted solar energy for an interior window in OS?

In that case, since the "InteriorWindow" is assigned to both subsurfaces, isn't this equivalent to having two windows? One on each adjacent surface? How is this handled by the software? I'm also working on a greenhouse model and I need to modelize an interior window between two spaces, but I want only one window. Should I delete one subsurface (like a hole in the wall)?