A heat pipe exchanger was adopted to recover the engine exhaust energy and its internal gas pressure. Velocityand temperature distribution were obtained with the computational fluid dynamics software called ‘FLUENT’. Based onthe simulation results, the structure of the exchanger was improved, and its working performance was verified byexperiments. The experiments showed that the pressure loss of the exchanger is only about 850 Pa, which has lessinfluence on engine performance and is in good agreement with the simulation, as this is a more homogeneous internal airtemperature distribution with better exchanger’s efficiency. And by measuring the output power under the temperatures335 K, 355 K, 375 K and 395 K, respectively, at the cold end of the semiconductor thermoelectric generator, it was foundthat it had the same cold end temperature and the temperature difference was over 100 K. The output power increasesrapidly at first and then continues to grow but at a decreasing rate, and the largest output power is 75.6 W when the coldend temperature is 335 K with the temperature difference of 380 K, and in addition to this it was observed that under thesame temperature difference, the lower cold end temperature is the larger the output power.
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