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The thermoelectric generator (TEG) and thermoelectric cooler (TEC) are emerging technologies for efficient-clean energy conversion-utilization systems. TE element number arrangement greatly affects the performance of two-stage TEGs/TECs or TEG-TEC combined systems. In the present study an endeavor has been proposed for a novel TEG-TEC integrated system by replacing the two-stage TEG with two-separated single-stage TEGs. Similar temperatures were applied to TEGs and individual systems with discrete currents demonstrate better performance than that with current connected in series. Corresponding multi-parameter and multi-objective optimization approach have been applied to automatically estimating the optimal structure. It has been witnessed that the separated systems can directly adjust the currents I₁ and I₂ to upsurge the Peltier cooling of upper stage. Therefore, the separated design is …