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3실형 멀티 열펌프 시스템의 고장감지 및 진단에 관한 연구
한융희(Yung Hee Han),이일환(Il Hwan Lee),김민수(Min Soo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Nowadays, multi type heat pump systems that have one outdoor unit and several indoor units have been developed. Indoor units are inter-connected together, thus change of one indoor unit influences the performance of other indoor units. Capacity control with PI multi-loop controller was carried out for multi type heat pump system. Saturation pressure in the evaporator was suggested for the control variable of compressor speed modulation. An experimental study was performed in this study to develop a method for fault detection and diagnosis with multi type heat pump system. Three major faults were investigated which are indoor fan fault, outdoor fan fault and refrigerant leakage. Rule-based fault classifier was used in order to detect and diagnose the system. The variation of residuals between reference data and measured data were used for the detection of faults. As a result, faults can be detected and diagnosed by measuring evaporation temperature and compressor discharge temperature.
이재승(Jae Seung Lee),한융희(Yung Hee Han),김민수(Min Soo Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In the air-conditioning and refrigeration industry, the efforts to protect the environment have been made. One of them is to use carbon dioxide as an alternative refrigerant, however, several researches have shown that the transcritical heat pump system using CO₂ has relatively lower efficiency resulting in a degraded steady-state system performance. Capacity control with fuzzy controller was carried out for CO₂ heat pump system. Evaporator secondary fluid outlet temperature was suggested for the control variable of compressor speed modulation.