.10-6C Consider a simple ideal Rankine cycle with fixed turbine inlet conditions
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Question
.10-6C Consider a simple ideal Rankine cycle with fixed turbine inlet conditions. What is the effect of lowering the condenser pressure on (1) Pump work input: (2) Turbine work output (3) Heat supplied (4) Heat rejected (5) Cycle efficiency (6) Moisture content at turbine exit (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same .10-7C Consider a simple ideal Rankine cycle with fixed turbine inlet temperature and condenser pressure. What is the effect of increasing the boiler pressure on (7) Pump work input: (8) Turbine work output: (9) Heat supplied: (10) Heat rejected: (11) Cycle efficiency: (12) Moisture content at turbine exit (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same Page 591 10-8C Consider a simple ideal Rankine cycle with fixed boiler and condenser pressures. What is the effect of superheating the steam to a higher temperature on (13) Pump work input: (14) Turbine work output: (15) Heat supplied: (16) Heat rejected: (17) Cycle efficiency: (18) Moisture content at turbine exit: (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the sameExplanation / Answer
10-6 c....
1.pump work input increases....correct option..A
2.Turbine work output increases because expanaion pressure ratio incraleasese...hence A is the correct option
3. Heat supplied for the given case increase....hence A is the correct option.
4. Heat rejected in the condenser also increases because latent heat is more at the lower pressure..Hence A is the correct option.
5. Cycle efficiency increases because there is relatively more increase in work output than the heat supply ...hence A is the right choice.
6. Moisture content at the turbine exit is less because exit condition shifts rightward...Hence B is the appropriate choice.
10-7 C
7. Pump work input increases due to rise in pressure...A is right choice
8. Turbine work output decreases as the enthalpy at the inlet of turbine decreases...henec B is the correct option.
9. Heat supplied decreases...due to decrease in latent heat of vaporisation at higher pressure....Hence B is the correct answer.
10. Heat rejected in the condenser decrease as the exit condition shifts leftward....hence B is the correct answer.
11. Since work output decreases and there is decrease in heat supplied, hence the efficiency decreases....B is right answer.
12. Moisture content at the turbine exit increases as the exit condition shifts leftward...hence A is the correct answer.
10-8C
13. Pump work input remains same as there is no change in pressure ratio...Hence C is the correct answer.
14. Turbine work output increases....as the operating line shifts rightward...hence A is the correct choice.
15. Heat supply increases due to superheating...hence A is the right choice.
16. Heat rejected also increases due to higher enthalpy at exit of turbine....A is the correct answer.
17. cycle efficiency also increases as the net effect of superheating.....hence A is correct.
18. Moisture content decreases at exit.... B is the correct answer.
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