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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: Equipment layout and TS diagram for the cycle. Ideal turbine work (KW) Ans:_______________________________ Actual mass of steam bled into the open heater m1’= _____________kg/sec for the heater nearest to the SGU/boiler and m2’ = _____________________kg/sec for the heater nearest to the condenser. Actual engine efficiency (%) Answer: _______________________ Actual Rankine cycle efficiency % using Wt’ and Wp’ values   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: Equipment layout and TS diagram for the cycle. Ideal turbine work (KW) Ans:_______________________________ Actual mass of steam bled into the open heater m1’= _____________kg/sec for the heater nearest to the SGU/boiler and m2’ = _____________________kg/sec for the heater nearest to the condenser. Actual engine efficiency (%) Answer: _______________________ Actual Rankine cycle efficiency % using Wt’ and Wp’ values   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
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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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. Equipment layout and TS diagram for the cycle.
  2. Ideal turbine work (KW) Ans:_______________________________
  3. Actual mass of steam bled into the open heater m1’= _____________kg/sec for the heater nearest to the SGU/boiler and m2’ = _____________________kg/sec for the heater nearest to the condenser.
  4. Actual engine efficiency (%) Answer: _______________________
  5. Actual Rankine cycle efficiency % using Wt’ and Wp’ values   Answer: _____________
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