Abstract
In this paper, solar irradiance, ambient wind speed and power load are emulated by regulating the electric heating power, the centrifugal fan speed and the load resistance to emulate the operation condition of the solar dish Stirling power generation (SDS) system. The couple effects on the generated power and thermoelectric efficiency of a free piston Stirling generator (FPSG) prototype are tested experimentally. The heat dissipation characteristics of the outer wall is analyzed. The results show that in certain start-up condition the generated power drops rapidly from 180.8 W to the lowest point of 77.1 W at 36 s, then rise gradually and stabilize at 12 min. The generated power is approximately positively linear with the heating power while the thermoelectric efficiency rises firstly followed by decline, with a peak of 20.3% at 5 kW. The wind speed reduces the generated power, thermoelectric efficiency and radiation loss, but increases the convection loss. The generated power and thermoelectric efficiency decrease with the load resistance, with the maximum values of 1364.6 W and 23.3% respectively.
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