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A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 93%. There is a total of 6 kg/sec of steam circulated in the cycle. Answer the following: fill up the blanks in the items below: 1. Equipment layout and TS diagram for the cycle 2. Actual mass of steam bled into the open heater m1=0256 kg/kg for the heater nearest to the SGU/boiler and m2' =_ kg/sec for the heater nearest to the condenser. 3. Actual turbine work in KW Answer: 4. Energy Chargeable (actual) Answer: 5. Ideal Rankine engine efficiency % Answer: 6. Actual Rankine cycle efficiency % Answer: 8956.64 KW 20.256.92 kW 461730 43.78°/ 7. If the generator efficiency = 95%, brake engine efficiency = 90% what is the plant capacity in MW? Answer: 7.66 MW 8. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (ACTUAL) Answer: 245.60 ks/ 9. Combined Heat Rate in KJ/KW-hr Answer: 952271 10. Speed of the turbine shaft in rev per minute if Torque measured by the dynamometer= 5.92 KN-m. Answer: 1003.25 Rpm

A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 93%. There is a total of 6 kg/sec of steam circulated in the cycle. Answer the following: fill up the blanks in the items below: 1. Equipment layout and TS diagram for the cycle 2. Actual mass of steam bled into the open heater m1=0256 kg/kg for the heater nearest to the SGU/boiler and m2' =_ kg/sec for the heater nearest to the condenser. 3. Actual turbine work in KW Answer: 4. Energy Chargeable (actual) Answer: 5. Ideal Rankine engine efficiency % Answer: 6. Actual Rankine cycle efficiency % Answer: 8956.64 KW 20.256.92 kW 461730 43.78°/ 7. If the generator efficiency = 95%, brake engine efficiency = 90% what is the plant capacity in MW? Answer: 7.66 MW 8. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (ACTUAL) Answer: 245.60 ks/ 9. Combined Heat Rate in KJ/KW-hr Answer: 952271 10. Speed of the turbine shaft in rev per minute if Torque measured by the dynamometer= 5.92 KN-m. Answer: 1003.25 Rpm

Refrigeration and Air Conditioning Technology (MindTap Course List)
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
Chapter36: Refrigeration Applied To Air-conditioning
Section: Chapter Questions
Problem 9RQ: What are higher-efficiency refrigerant blends that can be used as long-term replacements for R-22 in...
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A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 93 %. There is a total of 6 kg/sec of steam circulated in the cycle. Answer the following: fill up the blanks in the items below: 1. Equipment layout and TS diagram for the cycle 2. Actual mass of steam bled into the open heater m1= 0.0256 kg/kg for the heater nearest to the SGU/boiler and m2' =_ (kg/sec for the heater nearest to the condenser. 8956.64 KW 20.256.92 kW 401730% 43.78°/ 6. Actual Rankine cycle efficiency % Answer: 7. If the generator efficiency = 95%, brake engine efficiency = 90% what is the plant capacity in MW? Answer: 3. Actual turbine work in KW Answer: 4. Energy Chargeable (actual) Answer: 5. Ideal Rankine engine efficiency % Answer: MW 8. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (ACTUAL) Answer: 245.60 KS2 9. Combined Heat Rate in KJ/KW-hr Answer: 952271 10. Speed of the turbine shaft in rev per minute if Torque measured by the dynamometer= 5.92 KN-m. Answer: 13,003.2.5 Rpm
Transcribed Image Text:A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 93 %. There is a total of 6 kg/sec of steam circulated in the cycle. Answer the following: fill up the blanks in the items below: 1. Equipment layout and TS diagram for the cycle 2. Actual mass of steam bled into the open heater m1= 0.0256 kg/kg for the heater nearest to the SGU/boiler and m2' =_ (kg/sec for the heater nearest to the condenser. 8956.64 KW 20.256.92 kW 401730% 43.78°/ 6. Actual Rankine cycle efficiency % Answer: 7. If the generator efficiency = 95%, brake engine efficiency = 90% what is the plant capacity in MW? Answer: 3. Actual turbine work in KW Answer: 4. Energy Chargeable (actual) Answer: 5. Ideal Rankine engine efficiency % Answer: MW 8. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 10 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (ACTUAL) Answer: 245.60 KS2 9. Combined Heat Rate in KJ/KW-hr Answer: 952271 10. Speed of the turbine shaft in rev per minute if Torque measured by the dynamometer= 5.92 KN-m. Answer: 13,003.2.5 Rpm
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