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. () Find the overall efficiency of the cyele. i) If 50000 kgh of steam flows through the steam turbine, what is the flow through the mercury turbine ? i) 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 super- heater located in the mercury boiler, and if the internal efficiencies of the mereury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficieney of the cycle. The properties of saturated mereury are given below: p (bar) t(C) (kJ/ hg) (hJ / kg K) (m³lkg) 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%, (ii) 59.35 × 10' kg/h, (iii) 28.49 MW, (iv) 46.2%)
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. () Find the overall efficiency of the cyele. i) If 50000 kgh of steam flows through the steam turbine, what is the flow through the mercury turbine ? i) 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 super- heater located in the mercury boiler, and if the internal efficiencies of the mereury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficieney of the cycle. The properties of saturated mereury are given below: p (bar) t(C) (kJ/ hg) (hJ / kg K) (m³lkg) 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%, (ii) 59.35 × 10' kg/h, (iii) 28.49 MW, (iv) 46.2%)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter22: Condensers
Section: Chapter Questions
Problem 8RQ: Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______,...
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Please answer the sub-parts ii, iii and iv.
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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A binary-vapour cycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is suppliedto the mercury turbine, from which it exhaust at 0.04 bar. The mercury condenser generates saturatedsteam at 15 bar which is expanded in a steam turbine to 0.04 bar.(i) Find the overall efficiency of the cycle.(ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercuryturbine ?(iii) Assuming that all processes are reversible, what is the useful work done in the binary vapour cyclefor the specified steam flow ?(iv) If the steam leaving the mercury condenser is superheated to a temperature of 300°C in a superheaterlocated in the mercury boiler, and if the internal efficiencies of the mercury and steam turbinesare 0.85 and 0.87 respectively, calculate the overall efficiency of the cycle. The properties ofsaturatedmercury are given below :
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