EXPERIMENTAL STUDY ON WASTE HEAT RECOVERY FROM AN INTERNAL COMBUSTION ENGINE USING THERMOELECTRIC TECHNOLOGY
EXPERIMENTAL STUDY ON WASTE HEAT RECOVERY FROM AN INTERNAL COMBUSTION ENGINE USING THERMOELECTRIC TECHNOLOGY
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DOI：
10.2298/tsci100518053k
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发表时间：
2011-01-01
期刊：
影响因子：
1.7
通讯作者：
Goel, Rahul
中科院分区：
文献类型：
--
作者：
Kumar, C. Ramesh;Sonthalia, Ankit;Goel, Rahul
在内燃机中提供的热量的主要部分没有实现为功输出，而是作为废热排放到大气中。如果这些废热能被利用并转化为可用的能量。能够提高AN发动机的整体效率。根据发动机负载，通过废气排放到环境中的能量中可以潜在回收的能量的百分比约为燃料供应的能量的30-40%。用作热电发电机的热电模块是用于将热能从温度梯度转换为电能的固态装置，并且其基于塞贝克效应的基本原理工作。本文展示了热电发电的潜力。对温差发电器在发动机各种工况下的性能进行了详细的实验研究。设计了一种具有18个温差发电模块的热交换器，并在发动机试验台上进行了试验。根据发动机排气侧和冷却液侧的温差选择热电模块。使用计算机辅助设计对热交换器的各种设计进行建模，并使用可商购获得的计算流体动力学代码进行分析，以研究流动和传热特性。从模拟结果可以看出，矩形换热器满足我们的要求，也满足空间和重量的约束。制作了一个矩形换热器，并将热电模块集成到换热器上进行性能分析。该研究还表明，可以从发动机排气中有效地利用能量，在不久的将来，热电发电机可以减小交流发电机的尺寸或在汽车中消除它们。
A major part of the heat supplied in an internal combustion engine is not realized as work output, but dumped into the atmosphere as waste heat. If this waste heat energy is tapped and converted into usable energy. the overall efficiency of AN engine can be improved. The percentage of energy rejected to the environment through exhaust gas which can be potentially recovered is approximately 30-40% of the energy supplied by the fuel depending on engine load. Thermoelectric modules which are used as thermoelectric generators are solid state devices that are used to convert thermal energy from a temperature gradient to electrical energy and it works on basic principle of Seebeck effect. This paper demonstrates the potential of thermoelectric generation. A detailed experimental work was carried to study the performance of thermoelectric generators under various engine operating conditions. A heat exchanger with 18 thermoelectric generator modules was designed and tested in the engine test rig. Thermoelectric modules were selected according to the temperature difference between exhaust gases side and the engine coolant side. Various designs of the heat exchangers were modeled using computer aided design and analysis was done using a computational fluid dynamics code which is commercially available to study the flow and heat transfer characteristics. From the simulated results it was found that rectangular shaped heat exchanger met our requirements and also satisfied the space and weight constraint. A rectangular heat exchanger was fabricated and the thermo electric modules were incorporated on the heat exchanger for performance analysis. The study also revealed that energy can be tapped efficiently from the engine exhaust and in near future thermoelectric generators can reduce the size of the alternator or eliminate them in automobiles.