Fig. 1. Schematic of the GPHS structure (the GPHS module provides steady heat for a radioisotope power system)^[14]

Fig. 2. (a) Schematic of the design deconstruction of the simulated GPHS, (b) physical photographs of the assembly of each component of the heat source

Fig. 3. Photographs of the experimental test scenario simulating the GPHS simulated heat source

Fig. 4. (a) The grid model of imitation GPHS heat source, (b) the calculated temperature thermogram of simulation, (c) 3D plot of the variation of the heat source temperature with the heat transfer rate of the metal and graphite cladding for an input poser of 250 W, (d) 3D plot of the variation of the heat source temperature with the thickness of the metal and graphite cladding, (e) imitation of GPHS simulated heat source and GPHS simulation to calculate the temperature variation curve as a function of the input thermal power

Fig. 5. (a) Infrared thermogram of the simulated GPHS heat source surface for different heat source input conditions, (b) plot of the test temperature of the heat source surface versus the input power

Fig. 6. (a) 3D plot of the heat source surface temperature versus atmospheric pressure and surface emissivity in the application environment, (b) 3D plot of the heat source surface temperature versus ambient temperature and internal power of the heat source

Fig. 7. (a) Physical photograph of the thermoelectric module test, (b) graph of the I-V and P-V test data of the thermoelectric module, (c) graph of the heat source input power versus energy conversion efficiency