This model tests the coupled simulation of Buildings.ThermalZones.Detailed.CFD with the FFD program by simulating the natural convection in an empty room with only exterior walls and without windows.
Figure (a) shows the schematic of the FFD simulation. The room is 1 meter in length, width and height. The walls are exposed to the ambient environment (cold winter night in Chicago) and the insulation is very poor. The initial values are for the temperatures of the walls 20°C and for temperature of the air 30°C. All temperature drop quickly due to the heat loss. Two sensors are placed in the room center at (0.5 m, 0.5 m, 0.5 m) that measure the temperature and the velocity.
Figure (a)
Figure (b) shows the velocity vectors and temperature contours in degree Celsius on the X-Z plane at Y = 0.5 m as simulated by the FFD. In the cold mid-night of Chicago, the temperature of the ceiling is the lowest and the temperature of the ground floor is the highest.
Figure (b)