Hybrid heat recovery system applied to exhaust gas of chimneys – Thermal modeling and case study

Due to high dependence on Energy, researches on energies are of main concerns nowadays. Due to high energy losses in industrial and residential applications, energy recovery is actually one of the most efficient solutions to overcome those losses. Thermal energy losses are the major types of energy losses and are mainly though exhaust gases of many systems. This paper deals with a hybrid heat recovery system applied to the exhaust gases of a chimney. It uses the thermal energy of the exhaust gases of a chimney to heat domestic water and produce electricity using thermoelectric generators at the same time. To proceed, thermal and electrical modelling are exploited and a case study is considered. It was shown that a maximum water temperature of 80 °C was achieved and 46Wof electricity are produced at a 24.5 °C temperature difference through the TEG thickness