Dynamic Compensation in a Failure Diagnosis System for Absorption Chillers/Heaters.

Abstract

Recently, environmentally-friendly absorption chillers/heaters have become popular as air conditioning/heating sources. This system is free from CFC use. In this way next improvements such as a system for maintenance, including failure diagnosis, are needed to be considered. The authors earlier proposed a failure diagnosis system for absorption chillers/heaters that is compact and sufficiently accurate. The system uses linear or curvilinear quantitative relationships derived from experiments grounded on qualitative knowledge. These quantitative relationships, however, are only effective in steady-state. Therefore, under the condition of large state-transitions, the possibility of erroneous daignosis exists. In this paper, we propose a compensation method that allows the failure diagnosis system to be effective even under large state-transitions. The method eliminates possibil- ities of fault judgements.