Abstract
In order to disseminate distributed energy systems, an autonomous abnormal diagnosis is imperative. The purpose of this study is to develop the abnormal diagnosis method using the fieldbus technology, which makes it possible to share much information of field devices. At the first stage, the authors constructed a experimental apparatus of a heat exchanging process and a measurement and control system with fieldbus devices. Through experiments of the process characteristics, the abnormal diagnosis method for the air retention to the shell of the heat exchanger, in which the overall heat transfer coefficient is always monitored as the representative process parameter, was developed and its effectiveness was confirmed.
