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In openstudio you cannot set directly the ground temperature however, you can use a measure if you want to change it. By default your simulation runs with a constant ground temperature of 18oC throughtout the year, which you can also see at the .err file when the simulation completes. You will get a message like the one below:

* Warning * GetHTSurfaceData: Surfaces with interface to Ground found but no "Ground Temperatures" were input. * ~~~ * Found first in surface=SURFACE 1 * ~~~ * Defaults, constant throughout the year of (18.0) will be used.

As far as the heat transfer is concerned it depends from the outside boundary condition of your floor surface and the heat balance algorithm you chose. For more information you can see the documentation here and here. The most precise way, to my knowledge, would be to use KIVA with a measure. I hope this helped