CO2 Sequestration through Deep Saline Injection and ...

Figure 15
Combined collector and engine efficiency variation with operating temperature [39]
The most common power cycle used in solar power systems is the simple Rankine cycle with
superheat, as seen in Figure 16 [39]. This cycle combines constant-pressure heat addition and
rejection processes with adiabatic reversible compression and expansion processes. The system
utilizes a working fluid that changes phase during the heat-transfer processes to provide
essentially isothermal heat addition and rejection. Usually the working fluid is either water or an
organic liquid, in this design propane was chosen as the working fluid due to a lower heat of
vaporization than water.
Figure 16
Simple Rankine Cycle with Superheat [39]
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