On the other hand, efforts to reduce the heat resistance to the working gas of the Stirling engine in the heater tubes appear very worthwhile. The assumed reduction by a factor of 2 increases THe by 115 K and with it1 r/th by more than 5% (abs.). For this gain one should be inclined to accept the larger deviations of the heat flows during insolation (Fig. 4). During the eclipse, however, the large THe of 789.7°C for the HPSE with reduced resistance results in a too low heat flow to the Stirling heater when compared to the basic HPSE (Fig. 4). In order to reach the heat flow level of the basic HPSE, THe must be lowered to an estimated 770°C, and to reach the desired 1366.1 W of heat flow, to 754°C. Both of these THe are well above the THe for the basic HPSE and still permit ca. 4 and 3% (abs.) improvements, respectively, in 7jIh.
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