As a " first guess " approximation, the following equation can be used to estimate the natural draught / draft flow rate by assuming that the molecular mass ( i . e ., molecular weight ) of the flue gas and the external air are equal and that the frictional pressure and heat losses are negligible:
22.
After having fed the turbine, the steam is condensed by the tertiary cooling loop, which water is at 22 �C . The output coolant achieves 36 �C and is therefore transferred to the 150 m tall natural draught wet-type cooling tower that returns it to the initial temperature . 0.4-0.7 out of 31.6 m 3 / s leave the tower creating the typical plume.
