The calculation on the coolant dryness of the hollow conductor outlet in the evaporative cooling system of the hydro-generator

The coolant dryness of the hollow conductor outlet is an important parameter relevant to the working state of the evaporative cooling system. It was calculated by the balance equation of the flowing pressure and the flowing resistance in the past. The conventional method was complex, therefore a new calculation method on the basis of the condenser´s heat balance equation and over-all heat transfer equation was provided. So in order to prove the correction of the new calculation method, we constructed an experimental test according to the operating principle of the stator´s close-loop-circulating evaporative cooling system and some parameters such as the water volume flow and the water temperature of the condenser inlet were obtained. By comparison with the conventional method, the new calculation method is correct. Thus the simple and reliable calculation method can be applied to the engineering calculations in the evaporative cooling of the hydro-generator.