EJONS INTERNATIONAL JOURNAL ON MATHEMATICS, ENGINEERING & NATURAL SCIENCES ISSN 2602 - 4136

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Abstract


WASTE HEAT RECOVERY SYSTEMS: A SAMPLE APPLICATION IN A SPARK IGNITION ENGINE

In this study, waste heat recovery systems were examined in terms of reuse which is heat energy discarded to atmosphere as a lost energy at the energy production systems. In the study also in which the waste heat energy discarded into the atmosphere with exhaust gases in internal combustion engines is converted into electrical energy had been performed an exemplary application of the thermoelectric generator system. In this scope, the exhaust exchanger, which has design rectangular geometric structure of 190x160x50 mm dimensions and produced from 3 mm aluminum plate material and connected to the exhaust way of a single-cylinder spark ignition engine at a constant engine speed of 1800 rpm, 2200 rpm and 2600 rpm experimental studies had been performed. The flow area of the designed exhaust exchanger was divided 2 equal parts and into the structure where electricity can realizable produced from both surfaces of the exchanger had been created. In experimental studies, using K type thermocouple from 6 different points selected from the heat exchanger surface via the inlet-outlet temperatures of the exhaust gases over the exhaust heat exchanger temperature measurement was carried out by. Using the heat exchanger exhaust gas inlet temperature and flow rate obtained in the experimental studies, computational fluid dynamics (CFD) method of the same heat exchanger geometry was performed in a steady and pressure-based analysis. In CFD analysis, the contour distributions are created by analyzing the pressure, temperature and velocity distributions in the heat exchanger along with the heat exchanger inlet and outlet temperatures. By comparing the experimental and numerical analysis results, the correctness of the results performed in the CFD program was determined. From the results obtained within the scope of the study, it was observed that total system efficiency can be increased in energy generation systems by using waste heat recovery systems. Also, by designing experimental work carried out exhaust heat exchanger inlet-outlet temperatures combined heat exchanger in which the temperature distribution of the CFD program aid can be detected by a close error to 10%, compared to high engine speed at low engine speed error rate was found to be lower.



Keywords
Internal combustion engine, Exhaust waste heat conversion, Thermoelectric generator



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