Considering that the change in enthalpy at the first stage of a Reheat Rankine Cycle is 1050 kJ/kg and 850 BTU/lb was recorded in the second stage, calculate for the thermal efficiency (in percent) of the cycle if both stages has a 93% efficiency and having a heat added of 9000 kJ/kg. (Hint: Neglect the pump work)

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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2. Considering that the change in enthalpy at the first stage of a Reheat Rankine Cycle
is 1050 kJ/kg and 850 BTU/lb was recorded in the second stage, calculate for the
thermal efficiency (in percent) of the cycle if both stages has a 93% efficiency and
having a heat added of 9000 kJ/kg. (Hint: Neglect the pump work)
Transcribed Image Text:2. Considering that the change in enthalpy at the first stage of a Reheat Rankine Cycle is 1050 kJ/kg and 850 BTU/lb was recorded in the second stage, calculate for the thermal efficiency (in percent) of the cycle if both stages has a 93% efficiency and having a heat added of 9000 kJ/kg. (Hint: Neglect the pump work)
Use these values when necessary:
1 kg 2.205 lb
°C to K (use + 273.15)
1 bar
100 kPa
1 atm
101.325 kPa
1 BTU
1.055 kJ 778 ft-lb
1 HP 0.746 kW 2545 BTU/hr
:
h
8 MPa and 480 °C
82 MPa
:
h
:
h
2 MPa and 460 °C
@60°C
:
Prat
he
hfg
St
Sig
V₂
3348.4 kJ/kg;
2963.145 kJ/kg
3379.5 kJ/kg;
-0.019940 MPa
- 251.13 kJ/kg
- 2358.5 kJ/kg
s 6.6586 kJ/kg - K
s 7.3147 kJ/kg - K
0.8312 kJ/kg - K
7.0784 kJ/kg - K
0.0010172 m³/kg
Transcribed Image Text:Use these values when necessary: 1 kg 2.205 lb °C to K (use + 273.15) 1 bar 100 kPa 1 atm 101.325 kPa 1 BTU 1.055 kJ 778 ft-lb 1 HP 0.746 kW 2545 BTU/hr : h 8 MPa and 480 °C 82 MPa : h : h 2 MPa and 460 °C @60°C : Prat he hfg St Sig V₂ 3348.4 kJ/kg; 2963.145 kJ/kg 3379.5 kJ/kg; -0.019940 MPa - 251.13 kJ/kg - 2358.5 kJ/kg s 6.6586 kJ/kg - K s 7.3147 kJ/kg - K 0.8312 kJ/kg - K 7.0784 kJ/kg - K 0.0010172 m³/kg
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