Investigation of chemical heat storage processes for recovering exhaust gas energy in internal combustion engines

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Improving the energy efficiency of the IC engine and hybrid vehicles has become more and more important. Chemical heat storage system is one of the approaches to address it by utilising the wasted energy. This study was aimed to develop a chemical heat storage (CHS) system using magnesium hydroxide (Mg(OH)2) to recover the thermal energy wasted by the exhaust gas in internal combustion (IC) engines. The stored heat can be used to heat the intake air, catalysts, lubricants in IC engines and batteries in hybrid vehicles. Experiments were conducted on a Diesel engine (D1146TI) to estimate the efficiency of CHS technology in the heat storage process. Experimental results showed that at engine load 60% to 80%, 33.68% to 61% of the chemical material reacted with 3.69% to 5.05 % heat energy of exhaust gas stored in one hour time. The percentages of the chemical material reacted and the stored exhaust gas heat energy decreased with the decreased engine load. To verify the efficiency of a similar CHS system in the gasoline engine, the processes in a CHS system were numerically simulated. Simulation and experimental results showed that the CHS system was efficient if the operation time of the engine was longer than that for heating the chemical material to reach the reaction temperature.
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