1. Equipment and TS diagram with the cycle. 2. 3. 4. 5. 6. 7. 8. PROBLEM: 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 with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 9. Actual mass of steam bled into the open heaters (kg/kg) = a) Ideal turbine work in KW. Answer: Actual steam rate in Kg/KW-hr. Answer: Heat rejected at the condenser in KW. (ACTUAL) Answer: Actual Rankine engine efficiency %. Answer: Actual Heat Added (KW). Answer: b) Actual Rankine cycle efficiency % Answer: If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer: 10. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (IDEAL) Answer:
1. Equipment and TS diagram with the cycle. 2. 3. 4. 5. 6. 7. 8. PROBLEM: 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 with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 9. Actual mass of steam bled into the open heaters (kg/kg) = a) Ideal turbine work in KW. Answer: Actual steam rate in Kg/KW-hr. Answer: Heat rejected at the condenser in KW. (ACTUAL) Answer: Actual Rankine engine efficiency %. Answer: Actual Heat Added (KW). Answer: b) Actual Rankine cycle efficiency % Answer: If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer: 10. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (IDEAL) Answer:
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
Chapter43: Air Source Heat Pumps
Section: Chapter Questions
Problem 9RQ: Where is the only permanent suction line on a heat pump?
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Transcribed Image Text:Homework no. 4
PROBLEM: 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 with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression
efficiencies are 90 %. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the
items below:
1. Equipment and TS diagram with the cycle.
2.
3.
4.
5.
6.
7.
8.
9.
Actual mass of steam bled into the open heaters (kg/kg) = a).
Ideal turbine work in KW. Answer:
Actual steam rate in Kg/KW-hr. Answer:
Heat rejected at the condenser in KW. (ACTUAL) Answer:
Actual Rankine engine efficiency %. Answer:
Actual Heat Added (KW). Answer:
Actual Rankine cycle efficiency % Answer:
If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer:
b)
10. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves at 21 deg C, find amount of
cooling water needed by the condenser in kg/sec. (IDEAL) Answer:
27
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