Viscosity of the oil is generally larger as compared with that of working fluid or water. For precise simulation, flow frictional resistance of oil should be evaluated.
With N lines of the parallel concentric tubes, the required pump power is obtained by the following [17]:
Y 2
1.2 Overall thermal efficiency
Net electricity output W is obtained by subtracting oil pump power from net output of the ORC.
w = Wore – Woil (21)
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Global electricity efficiency is defined by the proportion of net electricity output to the total irradiation as follows:
