Setting Ground Temperature in OS

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This BCL measure will allow you to set monthly ground temperatures: https://bcl.nrel.gov/content/a7048e34...

A youtube video describes it here: https://youtu.be/GO5RU8ccfs4?si=j5KUJ...

I am guessing you are looking for the object in the OpenStudio Application, as far as I know it has not been added to the application yet. You can add the site ground temperature to the model by using an OpenStudio measure. The documentation for this object is here

After simulating with OpenStudio, you can set up the Site:GroundTemperature:BuildingSurface in EnergyPlus. For buildings in a hot region, the ground temperature can be set to 24 to 26C for summer months, 16-18C for winter months, and decreasing temperatures for other months.

For those looking still for a answer on this. You need to do it by the use of scripts. In my case I have created one to use inside SketchUp Ruby Command. Here it is what I use:

require 'openstudio'

# Read the open model
model_interface = OpenStudio::Plugin.model_manager.model_interface
model = model_interface.openstudio_model

ground_temperatures = [10.0] * 12  # 12 months, all at 10ºC (change it for your input)
site_ground_temp = OpenStudio::Model::SiteGroundTemperatureBuildingSurface.new(model)
site_ground_temp.setAllMonthlyTemperatures(ground_temperatures)

Applying it you will see the following on energyplus default report:

On the other hand I recommend you having a look at CFactor and FFactor boundary conditions. They can be more precise methods for ground surfaces in contact.

Hope it helps :)