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전류정보를 이용한 가변속냉동시스템의 응축기 오염 On-line 고장진단
이동규(D. G. Lee),고대권(D. K. Koh),정석권(S. K. Jeong) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, on-line fault detection and diagnosis(FDD) of condensor fouling in a variable speed refrigeration system based on current information is introduced. An inverter and feedback control are essential to a variable speed refrigeration system for energy saving. RPM of a compressor and opening angle of an electronic expansion valve are changed by feedback control. Hence, pressure and temperature information for on-line FDD are insufficient due to compensation effect of the feedback control. Therefore this paper suggests utilization of the current information which is measured from an inverter for FDD. First, experimental equipment and method of data collection for regression analysis about the current information are represented. Then a regression equation about the current information is generated. Next, we show that the pressure and temperature information are insufficient due to compensation effect of feedback control. Finally, usefulness of the residual information between detected current and estimated current based on the regression equation is verified through some experiments.