Issues regarding the exhaust temperature and exhaust entropy of steam turbines during work generation
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At present, our plant’s steam turbine exhaust side does not have any temperature monitoring points; as far as I know, many power plants also lack such points, with temperature and vacuum monitoring only being provided at the surface cooling unit. There should be a difference between the temperature at the surface cooling unit and that at the exhaust side, right? What truly measures the capacity of a heat exchanger is the enthalpy drop between the inlet and outlet, but then why isn’t a temperature point at the surface-cooling outlet specified? Additionally, the theory behind steam-driven turbines doing work is that it is a isentropic process; yet since the pressure at the exhaust side is very low, why has the entropy value increased significantly?
The ideal process is isentropic, while in reality entropy always increases