Calculation of frictional resistance

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]:

image694
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)

image695 Подпись: (22)

Global electricity efficiency is defined by the proportion of net electricity output to the total irradiation as follows:

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