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首页> 外文期刊>International Journal of Refrigeration >Piston-cylinder work producing expansion device in a transcritical carbon dioxide cycle. Part I: experimental investigation
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Piston-cylinder work producing expansion device in a transcritical carbon dioxide cycle. Part I: experimental investigation

机译：跨临界二氧化碳循环中的活塞缸功生产膨胀装置。第一部分：实验研究

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摘要

Carbon dioxide is receiving strong consideration as an alternative refrigerant substituting hydroclorofluorocarbons (HCFCs) and chlorofluorocarbons (CFCs) due to its zero ozone depletion potential and negligible global warming potential. The system performance of CO{sub}2 systems, however, is typically poor compared to the current conventional air conditioning systems using HCFC or CFC, One of the most effective ways to achieve parity with CFC and HCFC systems is to replace the expansion valve with an expansion device that minimizes entropy creation and allows for energy recovery during the expansion process. A piston-cylinder type work output expansion device was designed, constructed and tested as part of the study reported here. The first-cut prototype device is based on a highly modified small four-cycle, two-piston engine that is commercially available. The work-producing expander replaced the expansion valve in an experimental transcritical CO{sub}2 cycle and increased the system performance by up to 10% as characterized by COP. The prototype device was not meant to be a final product, but provided valuable insight and experimental results to validate a detailed simulation model of the device. The model and corresponding theoretical analysis are presented in a companion part II paper.
机译：由于其零臭氧消耗潜力和可忽略的全球变暖潜力，二氧化碳作为替代制冷剂替代氢氯氟烃（HCFC）和氯氟烃（CFC）受到了广泛的考虑。但是，与目前使用HCFC或CFC的常规空调系统相比，CO {sub} 2系统的系统性能通常较差。与CFC和HCFC系统达到同等水平的最有效方法之一是用以下方式替换膨胀阀：一种可最大程度地减少熵产生并允许在膨胀过程中进行能量回收的膨胀装置。作为此处报告的研究的一部分，设计，构造和测试了活塞缸式工作输出扩展装置。首批原型设备基于高度可改装的小型四冲程两活塞发动机，该发动机已在市场上销售。生产出的膨胀机在跨临界CO {sub} 2的实验循环中替换了膨胀阀，并以COP为特征将系统性能提高了10％。原型设备并非最终产品，而是提供了宝贵的见识和实验结果，可验证设备的详细仿真模型。该模型和相应的理论分析在第二部分的配套文件中进行介绍。

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