퍼지알고리즘을 사용한 냉매압력제어 = Refrigerant Pressure Control by using a Fuzzy Algorithm

다국어 초록 (Multilingual Abstract)

Control methods for a CO₂ air-conditioning system should be different because of CO₂'s unique properties as a refrigerant. Especially, the high-side pressure of a CO₂ system should be controlled for the effective operation of a system. In this study, a fuzzy algorithm was developed for the control of the refrigerant pressure. The refrigerant pressure difference and its slope were used as input variables and the control signal difference for a electronic expansion valve was used as an output variable. The Min-Max method was used as an inference machine and the weight centroid method was used as a defuzzification tool.
In order to identify the effectiveness of the control algorithm, an initial start-up test, an indoor temperature setpoint step change test, and an outdoor air disturbance test, were performed. Test results showed the good control of a CO₂ air-conditioning system with stable control signals. Therefore the pressure control algorithm developed for this study may be practically applied for the control of an electronic expansion valve.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 시스템 모델
• 3. 냉매압력제어
• 4. 제어성능분석
• 5. 결론
• 참고문헌