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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 90 %.  There is a total of 10.3 kg/sec of steam (total mass flow rate m) circulated in the cycle. Answer the following: fill up the blanks in the items below: Actual Rankine cycle efficiency % using Qa’ and Qr’ values   Answer: _____________ If the generator efficiency = 95%, brake engine efficiency = 90%  what is the plant capacity in MW? Answer: ______________________ 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. (ACTUAL) Answer: _________________________

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 90 %.  There is a total of 10.3 kg/sec of steam (total mass flow rate m) circulated in the cycle. Answer the following: fill up the blanks in the items below: Actual Rankine cycle efficiency % using Qa’ and Qr’ values   Answer: _____________ If the generator efficiency = 95%, brake engine efficiency = 90%  what is the plant capacity in MW? Answer: ______________________ 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. (ACTUAL) Answer: _________________________

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 90 %.  There is a total of 10.3 kg/sec of steam (total mass flow rate m) circulated in the cycle.

Answer the following: fill up the blanks in the items below:

  1. Actual Rankine cycle efficiency % using Qa’ and Qr’ values   Answer: _____________
  2. If the generator efficiency = 95%, brake engine efficiency = 90%  what is the plant capacity in MW? Answer: ______________________
  3. 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. (ACTUAL) Answer: _________________________
  4. Combined Heat Rate in KJ/KW-hr   Answer: _________________________
  5. Speed of the turbine shaft in rev per minute if Torque measured by the dynamometer= 90 KN-m at the turbine shaft . Answer:______________________
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