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In this study, we have investigated the recovery of energy lost as waste heat   from exhaust gas and engine coolant, using an improved thermoelectric   generator (TEG) in a LPG fueled SI engine. For this purpose, we have designed   and manufactured a 5-layer heat exchanger from aluminum sheet. Electrical   energy generated by the TEG was then used to produce hydrogen in a PEM water   electrolyzer. The experiment was conducted at a stoichiometric mixture ratio,   1/2 throttle position and six different engine speeds at 1800-4000 rpm. The   results of this study show that the configuration of 5-layer counterflow   produce a higher TEG output power than 5-layer parallel flow and 3-layer   counterflow. The TEG produced a maximum power of 63.18 W when used in a   5-layer counter flow configuration. This resulted in an improved engine   performance, reduced exhaust emission as well as an increased engine speed   when LPG fueled SI engine is enriched with hydrogen produced by the PEM   electrolyser supported by TEG. Also, the need to use an extra evaporator for   the LPG fueled SI engine is eliminated as LPG heat exchangers are added to   the fuel line. It can be concluded that an improved exhaust recovery system   for automobiles can be developed by incorporating a PEM electrolyser, however   at the expense of increasing costs

Experimental investigation of an improved exhaust recovery system for liquid petroleum gas fueled spark ignition engine