A binary vapour cycle operates on mercury and steam. Standard mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhausts at 0.04 bar. The mercury condenser generates saturated steam at 17 bar which is expanded in a steam turbine to 10kpa. Draw TS diagram and Schematic Diagram (i) Determine the overall efficiency of the cycle. (ii) If 48000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ? (iii) Assuming that all processes are reversible, what is the useful work done in the binary vapour cycle for the specified steam flow ?
A binary vapour cycle operates on mercury and steam. Standard mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhausts at 0.04 bar. The mercury condenser generates saturated steam at 17 bar which is expanded in a steam turbine to 10kpa. Draw TS diagram and Schematic Diagram
(i) Determine the overall efficiency of the cycle.
(ii) If 48000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ?
(iii) Assuming that all processes are reversible, what is the useful work done in the binary vapour cycle for the specified steam flow ?
(iv) If the steam leaving the mercury condenser is superheated to a temperature of 300°C in a superheater located in the mercury boiler and if the internal efficiencies of the mercury and steam turbines are 0.84 and 0.88 respectively, calculate the overall efficiency of the cycle.
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