Q4. The plant shown in Fig Q4, produces 9 tonne/hour of dry saturated steam at a pressure of bar from steam at 10 bar and 300℃.
Some of the steam expands through a turbine producing 847 kW with an isentropic efficiency of 0.91.
Excess steam flow is passed through a throttle and then cooled at constant pressure. The amount of cooling is controlled to allow the adiabatic mixing of the two streams to give the required outlet condition. Pressure losses in the cooler and mixing vessel may be ignored.
(a) Calculate EACH of the following:
(i) the dryness fraction of the steam leaving the turbine;(5)
(ii) the degree of superheat of the steam leaving the throttle; (3)
(iii) the heat removed in the cooler. (5)
(b) Sketch the processes on a specific enthalpy-specific entropy diagram. (3)
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