# Question 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 15 bar which is expanded in a steam turbine to 0.04 bar. (1) Determine the overall efficiency of the cycle. (11) If 48000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine? (17) 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. The properties of standard mercury are given below: p (bar) 4.5 t(°C) 450 hakJ/kg h (kJ/kg) sq (kJkg K) V(m®/kg) 62.93 29.98 355.98 329.85 0.1352 0.0808 s, (kJkg K 0.5397 0.6925 79.9 x 10-6 76.5 x 10-6 (m®/kg) 0.068 5.178. 0.04 216.9

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Transcribed Image Text: 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 15 bar which is expanded in a steam turbine to 0.04 bar. (1) Determine the overall efficiency of the cycle. (11) If 48000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine? (17) 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. The properties of standard mercury are given below: p (bar) 4.5 t(°C) 450 hakJ/kg h (kJ/kg) sq (kJkg K) V(m®/kg) 62.93 29.98 355.98 329.85 0.1352 0.0808 s, (kJkg K 0.5397 0.6925 79.9 x 10-6 76.5 x 10-6 (m®/kg) 0.068 5.178. 0.04 216.9
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Transcribed Image Text: 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 15 bar which is expanded in a steam turbine to 0.04 bar. (1) Determine the overall efficiency of the cycle. (11) If 48000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine? (17) 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. The properties of standard mercury are given below: p (bar) 4.5 t(°C) 450 hakJ/kg h (kJ/kg) sq (kJkg K) V(m®/kg) 62.93 29.98 355.98 329.85 0.1352 0.0808 s, (kJkg K 0.5397 0.6925 79.9 x 10-6 76.5 x 10-6 (m®/kg) 0.068 5.178. 0.04 216.9