ptruong's profile - activity

thanks, i will give those a try. do you know if these are minimums?

anyone have any suggestions on this issue?

thank you, i didn't realize you could overwrite the default max in the idf without getting errors, but this seems to hav

thank you, i didn't realize you could overwrite the default max in the idf without getting errors, but this seems to hav

Maximum Outdoor Dry-Bulb Temperature for Supplemental Heater Operation Hello, My project has WSHP DOAS with a reheat coi

Minimum air change rate with VRF and DOAS Hello, I have a project with minimum outdoor airflow and minimum supply airflo

OpenStudio Water Source VRF Does the most recent version of OpenStudion support water source VRF? In the VRF system edi

OpenStudio: Modeling Geothermal + WSHP DOAS + VRF Hello, I am trying to model a geothermal closed loop system connected

actually, it turns out that when i first click on the surface search icon, the menu that pops up (not full screen) has a

OpenStudio surface search options grayed out Hello, In Surface Search, in the OS plug-in, why are all search options exc

removing unused constructions in OpenStudio Hello, My model has a lot of unused contructions - it was created by combini

OpenStudio Application runs very slow Hello, I am using the latest OS version and my model has about 230 zones. I find

Hello, I am modeling an active slab (in EnergyPlus 8.5) and need to determine the peak sensible cooling load. Currently, I am not including any ventilation, just sensible loads. In the output reports (i.e. Component Sizing Summary or "Peak Design Sensible Load" under Zone Component Load Summary), the reported peak loads match. However, when I look at the variables output for the design day condition (day and time) specified as peak in the output reports, the "Zone Radiant HVAC Cooling Rate" does not match. What is the difference between this value and the one reported in the output reports?

Hello, I am getting the following inlet/outlet node errors trying to model HW baseboard. All I have done is dragging and dropping the equipment into the zone equipment area under thermal zones. Is there something else I need to do to connect it on the plant side? Thanks

*** 536 ZoneHVAC:Baseboard:Convective:Water, *** indicated Name=HW Baseboard *** Only last 3 lines before error line shown..... *** 537 HW Baseboard, !- Name *** 538 Always On Discrete 1, !- Availability Schedule Name *** 539 , !- Inlet Node Name * Severe * IP: IDF line~539 Error detected in Object=ZONEHVAC:BASEBOARD:CONVECTIVE:WATER, name=HW BASEBOARD * ~~~ * *** IDF Context for following error/warning message: *** Note -- lines truncated at 300 characters, if necessary... *** 536 ZoneHVAC:Baseboard:Convective:Water, *** indicated Name=HW Baseboard *** Only last 4 lines before error line shown..... *** 537 HW Baseboard, !- Name *** 538 Always On Discrete 1, !- Availability Schedule Name *** 539 , !- Inlet Node Name *** 540 , !- Outlet Node Name * Severe * IP: IDF line~540 Error detected in Object=ZONEHVAC:BASEBOARD:CONVECTIVE:WATER, name=HW BASEBOARD * ~~~ * Field [Outlet Node Name] is required but was blank

Hello, I can't seem to figure out how to delete zone equipment under "Thermal Zones" . I've added baseboard heating but want to remove it.

I am using OS v1.10.

Thanks Phan

Is it possible to import constructions, construction sets, space types, etc. from another model? Does the "Load Library" feature only work with the default libraries or can I "load in" another project's (model-specific) library?

Thanks Matt, that worked. In the OS edit object for "OS:ShadingSurfaceGroup", there's a drop down menu for "Shaded Object Name". Must something be selected for the shading calculation to work? I am guessing that for shading from adjacent buildings, rather than just exterior shades like fins, this could just be left blank since there is not a single surface the building(s) will shade?

Hello, is modeling shading from adjacent buildings as easy as just creating the blocks in Sketchup and Open Studio will register these as building shading? I did a simple test where I created an adjacent building as a block in Sketchup, opened it in Open Studio, and in the "Facility" tab, under "Building Shading", see a "Shading Surface Group 1" object, which wasn't there previously. However, when clicking the actual object, it says "Coming Soon". Will this be captured correctly in EnergyPlus?

Thanks Phan

Thanks, and where do I get this InternalSourceConstruction from? There is a category for this in the library but no constructions within it, nor when I search the BCL.

I am getting the following error while trying to model a low temp radiant system:

Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2014.11.14 10:36,IDD_Version 8.1.0.009
   ** Severe  ** IP: IDF line~572 Object=ZONEHVAC:LOWTEMPERATURERADIANT:SURFACEGROUP, name=LOW TEMP RADIANT VAR FLOWCEILINGS, Required Field=[Surface 1 Name] was blank.
   ** Severe  ** IP: IDF line~572 Object=ZONEHVAC:LOWTEMPERATURERADIANT:SURFACEGROUP, name=LOW TEMP RADIANT VAR FLOWCEILINGS, Required Field=[Flow Fraction for Surface 1] was blank.
   ** Warning ** IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.

The idf looks like this:

ZoneHVAC:LowTemperatureRadiant:SurfaceGroup,
  Low Temp Radiant Var FlowCeilings;      !- Name

and nothing else follows after this, so the surface names and flow fractions are missing (below is cut and pasted from EP input output ref):

ZoneHVAC:LowTemperatureRadiant:SurfaceGroup, 
    Zone 1 Radiant Surfaces, !- name of surface list 
    Zn001:Flr001,            !- Surface name 1 
    0.75,                    !- Flow fraction for surface 1 
    Zn001:Roof001,           !- Surface name 2 
    0.25;                    !- Flow fraction for surface 2

Hello, When running my simulation, I get this error:

Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2014.11.14 09:02,IDD_Version 8.1.0.009
   ************* Beginning Zone Sizing Calculations
   ** Severe  ** GetSurfaceData: Zone has no surfaces, Zone=THERMAL ZONE 1
   **  Fatal  ** GetSurfaceData: Errors discovered, program terminates.

The geometry is a test model, a very simple one room zone created in SketchUp 2014. I projected all loose geometry, did surface matching (though not sure if that is needed for just one space), assigned space attributes including creating a new thermal zone, and ran it with ideal air loads. Everything looked fine in the Open Studio Facilities tab, so I am not sure why the surfaces are not carried over into the idf.

I had previously added a low temp radiant panel to the zone, which also resulted in an error saying that the surfaces and corresponding flow fractions were not defined within the ZoneHVAC:LowTemperatureRadiant:SurfaceGroup object. I am not sure if the first error (no surfaces in the model) caused the second (no surfaces available for surfacegroup definition), or if the second error somehow triggered something in the model that deleted all my surfaces from the idf. With the SketchUp app open in the background, I tried to create several more simple one-zone models with ideal air systems (no radiant panel), and kept getting the same no surfaces error.

However, when I finally closed out of the SketchUp app, and created a whole new model, opened up OpenStudio and ran it, everything was fine. But when I try the radiant panel again, I get the same second error from before.