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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT EXCHANGER FOULING ASSESSMENT BY CONFLUENCE BASED EXPERT SYSTEM

Naim Hamdia Afgan
Instituto Superior Técnico, Lisbon, Portugal

Maria da Graca Carvalho
Instituto Superior Técnico, Lisbon, Portugal

要約

Efficiency assessment of heat exchangers ensures the appropriate use of available energy. This paper presents the concept of heat exchanger on line expert system based on the qualitative reasoning theory. Using confluence of the heat exchanger efficiency defined by the NTU concept for the simple parallel current heat exchanger the respective methodology is developed to be used for the description of 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 efficiency of the heat exchanger. The paper describes selection of the diagnostic variables, and their on line measurements including respective logging system for the mentioning and acquisition of the data.
For the specific heat exchanger the expert system assessment was performed for different situations. An appropriate diagnostic system in the time period produces the set of the diagnostic variables reading , describing the state of the system. This set of the diagnostic variables converted into the confluence parameters constitutes the qualitative description of the instantaneous state of the system. Respective retrieval strategy is used to find corresponding state in the knowledge base with the set of the parameters describing individual malfunction of the system. Each malfunction state is accompanying by recommendation for its correction specified by expert advice.

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