Page 160 - DJJ20063- Thermodynamics 1

DJJ20063- Thermodynamics 1

Feedback To Activity 11B

4.3 The ideal Rankine cycle does not involve any internal irreversibility and consists of the

following four-stage processes:

Stage 1.
4 to 1: Constant pressure heat addition in a boiler.

Stage 2.

1 to 2: Isentropic expansion that takes place in the turbine or engine.

Stage 3.

2 to 3: Constant pressure heat rejection in the condenser.
Stage 4

3 to 4: Isentropic compression of water in the feed pump

4.4 The Rankine cycle is shown in the figure below.

40bar

5 1
523.3
0.045 bar
4
3040. 3
2

s
A B

As in activity 4.2
h1= 2801 kJ/kg and h2 = 1839.3 kJ/kg

Also, h3 = hf at 0.045 bar = 130 kJ/kg

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