Experimental Examination of Recovery by a Thermoelectric Generator of Heat Energy Lost to Engine Coolant in a SI Engine

In this study, the recovery of heat energy lost to engine coolant (Ec) in a liquid cooled, gas (propane) fueled spark ignition (SI) using thermoe-lectric generator (TEG) is experimentally researched. A two-layer rectangular geometry TEG designed, consisting propane exchanger (P_hex) lo-cated on surface an (Ec_hex). 20 items thermoelectric modules (TEMs), each 30x30 mm dimensions, are placing between Ec_hex and P_hex. design, cooling fluid used hot TEMs, fed cold surface. addition, with use designed TEG, there no need additional evaporator for gas. Experiments carried out at 8 speeds ranging from 1500 5000 rpm. As result, produces 1.25 – 3.01 W DC electrical power engine's rpm range, while efficiency fluctuates 2.7 3.1%. However, maximum TEG_power rpm, TEG_efficiency 3.1% On other hand, electri-cal approximately 1.1 1.26% charging system power. TEG's contribution again decreases speed.