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Abstract—Thermoelectric generators are considered as direct energy conversions between thermal and electrical energy. There are many applications in thermoelectric generators for energy harvesting and heat dissipation. Bismuth Telluride (Bi2Te3) is chosen as thermoelectric material because it is conveniently used in low quality waste heat. This paper aims to devise and set up a high efficiency heat exchanger for gas to gas application which mimics general waste heat with an additional function of partially converting thermal energy into electrical energy. This heat exchanger has a potential to reduce heat loss in the form of flue gas typically released to the environment. Some of the thermal energy that transfers through this unit is directly converted into electrical energy by using integrated thermoelectric generators (TEGs). An equipment in the form of countercurrent heat exchanger equipped with integrated TEGs is installed and tested. The results show temperature dependent thermoelectric properties from an open circuit experiment. They show power output in several cases of TEG connection patterns from a closed circuit experiment. The best power output of this system is 1,752 mW. The most thermoelectric efficiency is 0.16%. The best value of the maximum thermoelectric efficiency is 0.65%. The maximum heat recovery of the system is 23.35%.