# Question 8. A binary-vapour eycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhaust at 0.04 bar. The mereury condenser generates saturated steam at 15 bar which is expanded in a steam turbine to 0.04 bar. (i) Find the overall efficiency of the ceycle. (ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ? (ii) Assuming that all processes are reversible, what is the useful work done in the binary vapour eyele for the specified steam flow ? (iv) If the steam leaving the mereury condenser is superheated to a temperature of 300°C in a super- heater located in the mercury boiler, and if the internal efficiencies of the mercury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficiency of the eycle. The properties of saturated mercury are given below : p (bar) tCC) (kJ/ kg) (kJ / kg K) (m'/kg) 4.5 450 63.93 355.98 0.1352 0.5397 79.9 x104 0.068 0.04 216.9 29.98 329.85 0.0808 0.6925 76.5 x 10- 5.178 Ans. (i) 52.94%, (i) 59.35 × 10' kg/h, (iii) 28.49 MW, (iv) 46.2%)

D1X3KP The Asker · Mechanical Engineering
Transcribed Image Text: 8. A binary-vapour eycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhaust at 0.04 bar. The mereury condenser generates saturated steam at 15 bar which is expanded in a steam turbine to 0.04 bar. (i) Find the overall efficiency of the ceycle. (ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ? (ii) Assuming that all processes are reversible, what is the useful work done in the binary vapour eyele for the specified steam flow ? (iv) If the steam leaving the mereury condenser is superheated to a temperature of 300°C in a super- heater located in the mercury boiler, and if the internal efficiencies of the mercury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficiency of the eycle. The properties of saturated mercury are given below : p (bar) tCC) (kJ/ kg) (kJ / kg K) (m'/kg) 4.5 450 63.93 355.98 0.1352 0.5397 79.9 x104 0.068 0.04 216.9 29.98 329.85 0.0808 0.6925 76.5 x 10- 5.178 Ans. (i) 52.94%, (i) 59.35 × 10' kg/h, (iii) 28.49 MW, (iv) 46.2%)
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Transcribed Image Text: 8. A binary-vapour eycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhaust at 0.04 bar. The mereury condenser generates saturated steam at 15 bar which is expanded in a steam turbine to 0.04 bar. (i) Find the overall efficiency of the ceycle. (ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ? (ii) Assuming that all processes are reversible, what is the useful work done in the binary vapour eyele for the specified steam flow ? (iv) If the steam leaving the mereury condenser is superheated to a temperature of 300°C in a super- heater located in the mercury boiler, and if the internal efficiencies of the mercury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficiency of the eycle. The properties of saturated mercury are given below : p (bar) tCC) (kJ/ kg) (kJ / kg K) (m'/kg) 4.5 450 63.93 355.98 0.1352 0.5397 79.9 x104 0.068 0.04 216.9 29.98 329.85 0.0808 0.6925 76.5 x 10- 5.178 Ans. (i) 52.94%, (i) 59.35 × 10' kg/h, (iii) 28.49 MW, (iv) 46.2%)