Hybrid Heat Recovery System Applied To Exhaust Gases - Thermal Modeling And Case Study

Due to the high increase in the rate of energy demand, energy depletion became a major research preoccupation for scientists. Heat recovery is a promising solution to overcome wasting energy and then environment impact. This paper deals with a hybrid heat recovery system in which thermal energy in exhaust gases is being used to generate domestic hot water and produce electricity using thermoelectric generators. A thermal and electrical modeling is carried and a case study is done. The water temperature is measured experimentally over time and it achieved maximum temperature of 78 degrees C. Using the thermal modeling the power produced by thermoelectric generators is calculated. It shows that such system can produce up to 135 W at a 33.6 degrees C temperature difference over the thermoelectric generators. Economic and environmental studies are carried out showing that such system requires about 8 years as a payback period and about 5.1 tons of CO2 gas is reduced when the water is heated 80 times per month by the hybrid heat recovery system.