conversion efficiency is then given by equations 12, 18 and 27. In order to maximize 77 with respect to b (=TC/Tp) the equation drj/db = 0 must be solved: Figure 1 shows that dependence of the maximum conversion efficiency pmax on the parameter x for different values of the polarization coefficient Pp, assuming BT = 2tf a = Tj/Tp = 300/6000 = 0.05 and r4 = 2.17 x 10’3 (this last value corresponds to concentrated solar radiation with a concentration ratio of 100). Suppose the radiation emitted by the converter is not polarized (Pc = 0). The influence of the parameterx is seen to be important. T7max is significantly dependent on P , especially at low values of x. Detailed discussion and numerical results will be published in a future paper.
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