Getting Started

Here is a brief overview on getting setup, running an ERI calculation, and obtaining outputs.

Setup

To get started:

1. Either download OpenStudio 3.1.0 and install the Command Line Interface/EnergyPlus components, or use the nrel/openstudio docker image.
2. Download the latest release release.
3. To obtain all available weather files, run: openstudio workflow/energy_rating_index.rb --download-weather

Note

If the openstudio command is not found, it’s because the executable is not in your PATH. Either add the executable to your PATH or point directly to the executable found in the openstudio-X.X.X/bin directory.

Running

Run the ERI calculation on a provided sample HPXML file as follows: openstudio workflow/energy_rating_index.rb -x workflow/sample_files/base.xml

Note that the Reference Home, Rated Home and Index Adjustment Home (if applicable) simulations will be executed in parallel on the local machine.

This will generate output as shown below:

You can also request generation of hourly output CSV files as part of the calculation by providing one or more --hourly flags.

To request all possible hourly outputs: openstudio workflow/energy_rating_index.rb -x workflow/sample_files/base.xml --hourly ALL

Or one or more specific hourly output types can be requested, e.g.: openstudio workflow/energy_rating_index.rb -x workflow/sample_files/base.xml --hourly fuels --hourly temperatures

Run openstudio workflow/energy_rating_index.rb -h to see all available commands/arguments.

Output

Upon completion, ERI is provided in the console (stdout) as well as available in some of the summary output files. See the Outputs section for a description of all available outputs.