Performance Enhancement of Thermoelectric Generator-Radiative Cooling System With Thermal and Electrical Energy Storage

A thermoelectric generator (TEG) converts thermal energy into electrical energy when temperature gradients are created across its two surfaces. Integrating the TEG with a phase change material (PCM) and radiative cooling (RC) can increase the temperature gradient across its two surfaces. In this study, a two-layer RC paint has been developed and applied to the cold side of a TEG, and its performance was compared with TEG-white paint and TEG-no paint. The RC lowers the temperature of the cold side by 3.5 degrees C and 4.7 degrees C compared to TEGs with white paint and no paint, respectively. Integrating PCM with TEG-RC ensured a high electrical output, enabling continuous power for a typical weather sensor. The PCM-TEG-RC generated 2.7and 0.61 mW during summer and winter days in Istanbul, and nighttime outputs of 0.302 W and 0.395 mW, respectively. Despite similar costs, the electrical performance of TEG-RC was nearly double that of the TEG-white paint. It has also been determined that a storage capacitor with a value of 0.5 F can provide 24-h power backup to the typical weather sensor.