Lyle K's profile - activity

Transpired Solar Collector Bypass Control I'm modeling a SolarWall using the SolarCollector:UnglazedTranspired object in

Thanks, I just sent you an e-mail with the model

Radiance Measure with PAT 2.7.0 I'm having trouble running the Radiance Daylighting Measures in the OS PAT 2.7.0, gettin

@JustinShultz - if you are using Pandas to look at EP output, I would recommend querying the SQL output file

Agreed. Ideally these total values would come out as (near) equal. Personally, if the 'estimated instant + delayed sens

Chillers are sized to meet the full loop load multiplied by a component-level sizing factor

OS/SketchUp is my main E+ geometry creator and I haven't had any issues with OS v2.0+ in SketchUp (just my experience).

Do you have zone thermostats and design day temperature schedules defined for the zones in your ideal air loads model?

You're correct that no ceiling height is defined in the thermal zones, and the hard entered ACH airflows (converted to m

This Udemy course is a great resource for python/pandas/matplotlib/plotly/seaborn. You can usually grab the course for

Where can I install a ruby gem for use with OpenStudio 2.1.0 measures?

In past versions of OpenStudio (OS 1.#.#), I would install the appropriate files under the 'ruby-install' folder located in the main 'OpenStudio 1.#.#' folder.

I was able to get this working with the following... (1) Create an environment variable for GEM_PATH and path it to my

Install Ruby Gem for OS 2.1 Measures Where can I install a ruby gem for use with OpenStudio 2.1.0 measures? In past ver

Install Ruby Gem for OS 2.1 Measures Where can I install a ruby gem for use with OpenStudio 2.1.0 measures? In past ver

The 'Sizing Factor' field in your chiller object can be used to distribute the peak load between autosized components.

If you have two chillers and you would like them to be sized equally, enter '0.5' as the sizing factor for each chiller.

Thermal comfort models can be triggered using the Thermal Comfort Model Type field in the EnergyPlus People object (reference HERE). This field isn't exposed in the OpenStudio Application but it does exist in the OpenStudio SDK which means you should be able to create a measure using the setThermalComfortModelTypemethod on your PeopleDefinition.

Looks like there is a measure on BCL already that should assist with this.

Depending on what you are trying to analyze, you may want to consider the Solar Distribution setting and how it may impact your results.

I have noticed in hourly reports and the HTML EnergyPlus Outdoor Air Summary Report that thermal zones were not receiving ventilation air volumes as defined in the OS:DesignSpecification:OutdoorAir objects. I exported the IDF file from my OpenStudio model and all of the 'Design Specification Outdoor Air Object Name' fields are blank when opened in the IDF editor.

It appears OpenStudio (1.9.0) does not set the 'Design Specification Outdoor Air Object Name' for the AirTerminal:SingleDuct:VAV:Reheat object. This excerpt from the E+ Input/Output reference suggests this field is required for the AirTerminal to deliver the proper amount of ventilation...

I am not using demand controlled ventilation and the total airflow to zones is routinely under the volume of outdoor air defined.

How does OpenStudio implement the DesignSpec:OA to ensure the AirTerminal provides minimum ventilation at all times? Are there other approaches to consider or am I missing something here?

This question builds upon this previous question

Zone heating and cooling setpoints are defined under the 'Thermal Zones' tab in OpenStudio. You can create a temperature schedule and assign them to Cooling/Heating thermostat schedule. The OpenStudio User Documentation is a good resource for the OpenStudio Application.

Importing DWGs is a feature that is only available in SketchUp Pro. This can be a differentiator depending on your workflow to create geometry.

Are you using the Latent Fraction Schedule in the Water Use Equipment Definitions that are assigned to your WaterUse:Equipment objects? If the schedule is blank, there will be 0 latent heat gain.

You can use the .addToNode() method to add your setpoint manager to the supply side outlet node of your water loop.

I'm working with an EnergyPlus model and after a successful simulation run the SVG is not created.

Reading into the Auxiliary Programs documentation it appears the post process program HVAC-Diagram.exe creates the SVG from the BND file. The BND files appear after each simulation, and an appropriate eplusout.bnd is created in the EPTEMP folder during simulation.

Any thoughts on why the SVG is not being created? Can I run the HVAC-Diagram.exe with my output BND renamed to eplusout.bnd in a specific location?

Yes, you could take that approach -- set the 10 ACH max flow rate to the zone and then set the minimum fraction of OA at the air handling unit to 50%. Be mindful of other zones on the system if you are setting a minimum OA fraction at the AHU.

Here are some things to explore...

• For the 5 OA (outdoor air) ACH, set your DesignSpecification:OutdoorAir object to 5 ACH. Make sure your ceiling height is properly defined in your ThermalZone. Set 'Control For Outdoor Air' to 'YES' in your AirTerminal:SingleDuct:VAV:Reheat.
• For the 10 Total ACH, in your AirTerminal:SingleDuct:VAV:Reheat set your 'Zone Minimum Air Flow Input Method' to 'Fixed Flow Rate' and then convert your 10 ACH to CFM and enter in 'Fixed Minimum Air Flow Rate' field. Additionally, in the Sizing:Zone object, set the 'Cooling Design Air Flow Method' to 'DesignDayWithLimit' and then specify the 10 ACH (converted to CFM) in the 'Cooling Minimum Air Flow' field.

The EnergyPlus 'lights' object allows for an end-use subcategory definition.

OpenStudio does not expose this input in the user interface, but it does exist in the API which means you can create a measure to set this value for certain definitions.

These categories will show up in the 'End-Uses By SubCategory' table in the E+ HTML output file.

Thanks for sharing your solution!

This is a very common dilemma for modeling against ASHRAE 90.1 as they don't provide default curve coefficients. Full load efficiency at rated conditions is easy to define but it's true there are an infinite combination of part-load curve possibilities that may equate to the same IEER/IPLV/NPLV.

I have leveraged the California Title 24 Nonresidential ACM Reference Manual (link HERE) which does provide default curve coefficients for cooling equipment. Many of the efficiency requirements for Title 24-2013 align with the requirements of ASHRAE 90.1-2010.

The OpenStudio measure writing guide found HERE will lead you to all the documentation available as well.

The OpenStudio::Model object list can be found HERE which contains most of the methods needed for each model object. Some of the more general methods can be tricky to find, if you click on the 'inheritance diagram' for AirLoopHVAC you will see it traces back to OpenStudio::IdfObject which contains the setName() method, found HERE

new_AirLoop.setName("A new Name") should do the trick!

If you are looking at US TMY3 weather files you can download them in .CSV format HERE

Amir's article points to this . There is also this measure which appears to have extended functionality (more standards, no 'BETA' tags).

Issue #1: having multiple versions of the same measure floating about and expecting users to install custom ruby gems