Not only would this promote waterhammer, but the water particles would cause severe erosion within the turbine. This means that saturated steam would get wetter and wetter as it went through the successive stages. Turbines have a number of stages the exhaust steam from the first rotor will be directed to a second rotor on the same shaft. If the steam was at saturation temperature, this loss of energy would cause some of the steam toВ condense. The energy to make this happen can only have come from the steam, so logically the steam has less energy after it has gone through the turbine rotor. Superheated steam has its applications in, for example, turbines where the steam is directed by nozzles onto a rotor. The primary heating medium may be either the hot flue gas from the boiler, or may be separatelyВ fired. This may be a second heat exchange stage in the boiler, or a separate superheater unit. The saturated steam must be passed through an additional heat exchanger. Superheat cannot be imparted to the steam whilst it is still in the presence of water, as any additional heat simply evaporates more water. The steam is then described as superheated by the number of temperature degrees through which it has been heated above saturationВ temperature. If the saturated steam produced in a boiler is exposed to a surface with a higher temperature, its temperature will increase above the evaporating temperature. Including explanations of the Rankine and Carnot thermodynamic cycles, superheated steam tables and the Mollier (H-S)В chart. An explanation of the properties and uses of superheated steam (such as for electricity generation).

Entropy vs enthalpy hvac