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For core zones, the Kiva uses a 1-D finite difference method to calculate heat exchange between the zone and the deep ground.

The area of the core zone is determined by the area of its floor surface.

Kiva does not use the ground temperature objects. Instead, the deep ground temperature is calculated based on the zero-flux or ground water condition. Unless the deep ground boundary condition is very close to the building, you will likely see very little difference between the two options.

The Site:GroundTemperature:BuildingSurface objects are a much less refined approach to the problem and are not likely to provide a better solution for your example.

For core zones, the Kiva uses a 1-D finite difference method to calculate heat exchange between the zone and the deep ground.

The area of the core zone is determined by the area of its floor surface.

Kiva does not use the ground temperature objects. Instead, the deep ground temperature is calculated based on the zero-flux or ground water condition. Unless the deep ground boundary condition is very close to the building, you will likely see very little difference between the two options.

The Site:GroundTemperature:BuildingSurface objects are a much less refined approach to the problem and are not likely to provide a better solution for your example.