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 kPa1 atm = 101.325 kPa1 BTU = 1.055 kJ= 778 ft lb1 HP = 0.746 kW = 2545BTU/hr@ 8 MPa and 480 °C.:@ 2 MPa@ 2 MPa and 460 °C@ 60°Ch=h=h=PsathrhfgSfSigVI3348.4 kJ/kg;2963.145 kJ/kg3379.5 kJ/kg;s = 6.6586 kJ/kgS = 7.3147 kJ/kg-= 0.019940 MPa- 251.13 kJ/kg=2358.5 kJ/kg= 0.8312 kJ/kg- K= 7.0784 kJ/kgK= 0.0010172 m³/kgKK

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Answered: Considering that the change in enthalpy…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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
@ 8 MPa and 480 °C.
:
@ 2 MPa
@ 2 MPa and 460 °C
@ 60°C
h
=
h
=
h
=
Psat
hr
hfg
Sf
Sig
VI
3348.4 kJ/kg;
2963.145 kJ/kg
3379.5 kJ/kg;
s = 6.6586 kJ/kg
S = 7.3147 kJ/kg
-
= 0.019940 MPa
- 251.13 kJ/kg
=
2358.5 kJ/kg
= 0.8312 kJ/kg
- K
= 7.0784 kJ/kg
K
= 0.0010172 m³/kg
K
K

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