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首页> 外文期刊>Energy Conversion & Management >Improvement of bottoming cycle efficiency and heat rejection for HD truck applications by utilization of EGR and CAC heat
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Improvement of bottoming cycle efficiency and heat rejection for HD truck applications by utilization of EGR and CAC heat

机译：通过利用EGR和CAC热量提高HD卡车应用的底循环效率和散热

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摘要

Considering continuously rising fuel prices and the global warming problem it is significantly important to reduce fuel consumption of engines used in various applications. Of specific importance is the HD diesel engine used in large haul trucks because these vehicles have an extensive operating schedule, their engines have a high power output in the range of 200-400 kW and their number is significantly high. Considering current achievements, it appears that HDDI diesel engine bsfc cannot be significantly reduced in the future unless new ideas or techniques are employed. Under this framework the utilization of exhaust heat becomes inevitable because approximately 30-40% of fuel energy is rejected to the environment. A promising technique for the recovery of energy from the exhaust gas is the use of a Rankine bottoming cycle. This technical solution has been examined in the past with very positive indications and a strong potential for significant improvement. However various technical challenges have to be solved among which most important are packaging and rejection of excess heat from the engine cooling system. For this reason in the present work a simulation model which has been developed to describe the operation of a Rankine bottoming cycle is utilized to estimate the potential efficiency gain from its application on a heavy duty truck powered by a diesel engine. Using the simulation special attention is given to the utilization of EGR cooler and CA cooler (Charge Air) heat to increase the Rankine expander power output and thus improve bsfc reduction potential. Furthermore the utilization of both ECR and CAC heat amounts is used to minimize the negative impact of the Rankine cycle on the engine cooling system, the capacity of which is exceeded at high load. The last results to installation difficulties (larger engine radiator, etc.) and in some cases a significant amount of generated power is consumed to drive the cooling fan which obviously has a strong negative impact on the bsfc reduction potential. For this reason several scenarios are proposed and examined in the present work to avoid or minimize this problem. Results are produced for both organic and steam working media that reveal a very good potential for the application of Rankine bottoming cycles in HD engine applications. Furthermore it is revealed that the utilization of both EGR cooler and CA cooler heat beyond its positive effect on bsfc reduction potential is also beneficial for overall system packaging allowing the serious reduction of primary heat exchanger dimensions.
机译：考虑到持续上涨的燃料价格和全球变暖问题，降低用于各种应用的发动机的燃料消耗非常重要。特别重要的是大型卡车使用的HD柴油发动机，因为这些车辆的运行时间表很长，它们的发动机具有200-400 kW的高功率输出，并且数量非常多。考虑到目前的成就，除非采用新的思路或技术，否则HDDI柴油发动机的bsfc似乎无法在未来大幅降低。在这种框架下，由于大约30-40％的燃料能量被排放到环境中，因此不可避免地要利用废热。从朗肯回收能量的一种有前途的技术是使用朗肯底循环。过去，已经对该技术解决方案进行了检验，并给出了非常积极的迹象，并且有很大的改进潜力。但是，必须解决各种技术难题，其中最重要的是包装和排除发动机冷却系统产生的多余热量。为此，在本工作中，已开发出一种用于描述朗肯底循环的操作的仿真模型，以评估其在由柴油发动机提供动力的重型卡车上的应用所带来的潜在效率提升。使用该仿真时，应特别注意利用EGR冷却器和CA冷却器（增压空气）的热量，以提高Rankine膨胀机的功率输出，从而提高bsfc的还原潜力。此外，同时利用ECR和CAC热量来最小化朗肯循环对发动机冷却系统的负面影响，在高负荷下，朗肯循环的能力会被超过。最后导致安装困难（较大的发动机散热器等），并且在某些情况下会消耗大量发电功率来驱动冷却风扇，这显然会对bsfc降低潜力产生强烈的负面影响。因此，在本工作中提出并研究了几种方案，以避免或最小化此问题。有机和蒸汽工作介质的结果均显示出，兰金底循环在高清发动机应用中的应用潜力非常大。此外，还发现，利用EGR冷却器和CA冷却器热量超过其对bsfc还原潜力的积极影响，这对于整个系统的包装也非常有利，从而可以大大减小主热交换器的尺寸。

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  • 来源
    《Energy Conversion & Management》 |2012年第1期|p.19-32|共14页
  • 作者

    Dimitrios T. Hountalas; Georgios C. Mavropoulos; Christos Katsanos; Walter Knecht;

  • 作者单位

    Internal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens (NTUA),9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

    Internal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens (NTUA),9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

    Internal Combustion Engines Laboratory, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens (NTUA),9 Heroon Polytechniou St., Zografou Campus, 15780 Athens, Greece;

    Knecht Engine Consulting GmbH, Pappelstrasse 4. CH 8593 Kesswit, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bottoming cycle; rankine; diesel engine; EGR; exhaust heat recuperation;

    机译：触底周期;兰金柴油发动机;废气再循环余热回收;

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