Page 151 - DJJ20063- Thermodynamics 1

DJJ20063- Thermodynamics 1

Feedback To Activity 11A

4.1 The components of a simple close cycle steam plant as illustrated in the figure are:

a) The boiler, where water is converted into steam at a constant pressure and

temperature by the heat energy is received from the combustion of the
fuel.

b) The engine or turbine, in which the steam expands to a low pressure

causing work energy to be available.

c) The condenser, in which heat energy flows from the low pressure steam
into the condenser cooling water, resulting in the steam being condensed.

d) The feed pump or the compressor, which returns the water into the boiler.

4.2 A Carnot cycle is shown in the figure below.
T1 saturation temperature at 40 bar

= 250.3 + 273 = 523.3 K

T2 saturation temperature at 0.045 bar

= 31.0 + 273 = 304.0 K

T

4 1
523.3

304.0
3 2

s

Then from equation 11.5
T − T
 carnot = 1 2
T 1

523 3 . − 304
=
523 3 .
= 0.419 or 41.9 %
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