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5. Thermodynamic and Economic Study 397

Table 12.6 Main Parameters Considered in the Simulation
Variable Value Unit
Organic Rankine Cycle System
Ambient temperature 25 C
Pinch temperature 10 C
differential
Condensation temperature 40 C
Organic fluid flow 51.4 kg/s
Power generated 3000 kWe
Inlet turbine pressure 2857 kPa
Inlet turbine temperature 120 C
Outlet turbine pressure 500 kPa
Outlet temperature 61.5 C
pressure
Solar Collector System
Overall conversion 71.69 %
efficiency of the solar
circuit
Full load time of the storage 6.0 h
system
Full load time of the power 6.0 h
cycle operating directly
with solar energy
Thermal flow utilized for the Hitec Solar Salt
simulated storage system
Performance Parameters Calculated
Produced electrical power 3 MWe
Heat required 21,250 MWth
Thermal efficiency 14 %

Q u
h ¼ (12.1)
A a I
where h is the thermal efficiency of the collector; Q u is the useful power (W); A a is
2
the aperture area of the collector (m ); and I is the solar radiation absorbed in the
2
aperture plane (W/m ).
The modification of Eq. (12.1) yields Eq. (12.2):
Q u
A a ¼ (12.2)
hI