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A Confluence-Based Expert System for the Detection of Heat Exchanger Fouling

机译:基于汇流的换热器结垢检测专家系统

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Efficiency assessment of heat exchangers ensures appropriate use of the available energy. This article presents the concept of a heat exchanger on-line expert system based on qualitative reasoning. Using confluence of the heat exchanger effectiveness defined by the NTU (number of transfer units) concept for the simple parallel-stream heat exchanger, the methodology is developed to be used for the description of the generic behavior of the heat exchanger system. In this respect, particular attention was paid to the recognition of those situations leading to the degradation of the effectiveness of the heat exchanger. The article describes the selection of the diagnostic variables, and their on-line measurements including the logging system for monitoring and acquisition of the data. For a specific heat exchanger, the expert system assessment was performed for a number of different situations. An appropriate diagnostic system in the specified time period produces a set of readings of the diagnostic variables, describing the state of the system. The set of diagnostic variables convened into the confluence parameters constitutes the qualitative description of the instantaneous state of the system. A retrieval strategy is used to find the corresponding state in the knowledge base with the set of the parameters describing the individual malfunction state of the system. Each malfunction state is accompanied by a recommendation for its correction specified by expert advice.
机译:换热器的效率评估可确保合理利用可用能量。本文提出了基于定性推理的换热器在线专家系统的概念。利用简单并行流式换热器的NTU(转移单元数)概念定义的换热器效率的融合,开发了该方法以用于描述换热器系统的一般性能。在这方面,要特别注意那些导致热交换器效率下降的情况。本文介绍了诊断变量的选择及其在线测量,包括用于监视和采集数据的日志记录系统。对于特定的热交换器,针对许多不同情况进行了专家系统评估。在指定的时间段内,适当的诊断系统会生成一组诊断变量的读数,以描述系统的状态。汇集到融合参数中的诊断变量集构成了系统瞬时状态的定性描述。使用检索策略在知识库中找到相应的状态,其中描述了系统个别故障状态的参数集。每个故障状态都随附有专家建议指定的纠正建议。

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