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Thermodynamics - Reheat Rankine Cycle - One Stage
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Thermodynamics - Reheat Rankine Cycle - One Stage
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Jose Alfonso F. FabeBSME 2 – Thermodynamics 2
Level 5: Reheat Rankine Cycle with One-stage Reheat.
A steam power plant operates on the Ideal Reheat Rankine Cycle. Steam enters the turbine at 6.4
MPa and 450℃ and leaves at 2.5 MPa. Steam is then reheated at a constant pressure to 450℃
before it expands to 25 KPa, and the mass flow rate of steam through the cycle is 2.5 kg/s.
Determine the steam rate, turbine work, pump work, heat added in the boiler, heat added in the
reheater, total heat added to the cycle, total heat rejected by the condenser, power output of the
cycle, net heat, and the thermal efficiency.
Solution:
, At State 1:
𝑝1 = 6.4𝑀𝑃𝑎
𝑡1 = 450℃
From table 2.
𝑡𝑠𝑎𝑡 @ 6.4𝑀𝑃𝑎 = 279.88℃
Since, 𝑡1 > 𝑡𝑠𝑎𝑡 , then, it is in superheated steam state.
From table 3.
𝑘𝐽
ℎ1 = 3,296.0
𝑘𝑔
𝑘𝐽
𝑠1 = 6.6834
𝑘𝑔 ∙ 𝐾
At State 2:
𝑝2 = 2.5𝑀𝑃𝑎
𝑘𝐽
𝑠2 = 𝑠1 = 6.6834
𝑘𝑔 ∙ 𝐾
From table 2 @ 2.5MPa
𝑘𝐽
𝑠𝑔 = 6.2575
𝑘𝑔 ∙ 𝐾
𝑠𝑔 < 𝑠2, then, it is in superheated steam state.
From table 3@ 2.5MPa
We will solve enthalpy in state 2 by using linear interpolation.
Entropy Enthalpy
𝑘𝐽 𝑘𝐽
6.6438 3,008.8
𝑘𝑔 ∙ 𝐾 𝑘𝑔
𝑘𝐽 ℎ2
6.6834
𝑘𝑔 ∙ 𝐾
𝑘𝐽 𝑘𝐽
6.6854 3,032.9
𝑘𝑔 ∙ 𝐾 𝑘𝑔
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