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Warning in OpenStudio

I have the following warning:

* Warning * CalcSurfaceCentroid: 5 Surfaces have the Z coordinate < 0. * ~~~ * ...in any calculations, Wind Speed will be 0.0 for these surfaces. * ~~~ * ...in any calculations, Outside temperatures will be the outside temperature + 9.750E-003 for these surfaces. * ~~~ * ...that is, these surfaces will have conditions as though at ground level.

what this mean??

Warning in OpenStudio

I have the following warning:

* Warning * CalcSurfaceCentroid: 5 Surfaces have the Z coordinate < 0. * ~~~ * ...in any calculations, Wind Speed will be 0.0 for these surfaces. * ~~~ * ...in any calculations, Outside temperatures will be the outside temperature + 9.750E-003 for these surfaces. * ~~~ * ...that is, these surfaces will have conditions as though at ground level.

what this mean??

Warning in OpenStudio

I have the following warning:

*

** Warning * ** CalcSurfaceCentroid: 5 Surfaces have the Z coordinate < 0.
 * **   ~~~   * ** ...in any calculations, Wind Speed will be 0.0 for these surfaces.
 * **   ~~~   * ** ...in any calculations, Outside temperatures will be the outside temperature + 9.750E-003 for these surfaces.
 * **   ~~~   * ** ...that is, these surfaces will have conditions as though at ground level.

level.

what What does this mean??