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In a Rankine cycle, steam enters the turbine at 2.5 MPa and condenser at 50 kPa, what is the thermal efficiency of the cycle in %? A. 25% C. 15% B. 26% D. 16%

In a Rankine cycle, steam enters the turbine at 2.5 MPa and condenser at 50 kPa, what is the thermal efficiency of the cycle in %? A. 25% C. 15% B. 26% D. 16%

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
Chapter45: Domestic Refrigerators And Freezers
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Problem 8RQ: Frost accumulates on the evaporators of forced-draft refrigerators because A. they are generally...
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6. In a Rankine cycle, steam enters the turbine at 2.5 MPa and condenser at 50 kPa, what is the thermal efficiency of the cycle in %? A. 25% C. 15% B. 26% D. 16%
Use these values when necessary: Specific Heat Ratio (k) O2 - 1.395 Co2 = 1.288 Cpwater = 4.187 kJ/kg H2 - 1.4 He = 1.667 NH3 = 1.304 N2 = 1.399 Hg = 1.666 CH: = 1.321 K; Cpair = 1 kJ/kg - K; Cpatean = 2 kJ/kg - K 1 kg - 2.205 lb "C to K = (use + 273.15) 1 bar = 100 kPa 1 BTU = 1.055 kJ = 778 ft - lb 1 HP = 0. 746 kW = 2545 BTU/hr = 6.5748 kJ/kg - K @ 1.03425 MPa: @ 2.5 MPa : @ 7MPA and 550 deg C: = 2779. 4 kJ/kg; Sg hg = 2803.1 kJ/kg; Sg = 6.2575 kJ/ kg h: = 3530.9 kJ/kg; s: = 6.9486 kJ/kg - K - K
Transcribed Image Text:Use these values when necessary: Specific Heat Ratio (k) O2 - 1.395 Co2 = 1.288 Cpwater = 4.187 kJ/kg H2 - 1.4 He = 1.667 NH3 = 1.304 N2 = 1.399 Hg = 1.666 CH: = 1.321 K; Cpair = 1 kJ/kg - K; Cpatean = 2 kJ/kg - K 1 kg - 2.205 lb "C to K = (use + 273.15) 1 bar = 100 kPa 1 BTU = 1.055 kJ = 778 ft - lb 1 HP = 0. 746 kW = 2545 BTU/hr = 6.5748 kJ/kg - K @ 1.03425 MPa: @ 2.5 MPa : @ 7MPA and 550 deg C: = 2779. 4 kJ/kg; Sg hg = 2803.1 kJ/kg; Sg = 6.2575 kJ/ kg h: = 3530.9 kJ/kg; s: = 6.9486 kJ/kg - K - K
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