초저온 이원 냉동 시스템의 Cascade에서 과열도, 과냉각도 변화에 따른 온도 역전 현상과 시스템 운전의 안정화에 대한 연구
A Study on the Temperature Reversal Phenomenon and the Stabilization of System Operation in Cascade of Binary Refrigeration System with Superheat and Subcooling
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
This Study is carried out to stabilize the system according to the change of superheat and subcooling in binary refrigeration system by applying cascade system. When the system on 1st stage was started and the system on the other side was operated, a temperature reversal phenomenon occurred in which the temperature of the 1st cascade outlet was temporarily lowered. This means that the condensate heat exchange on the 2nd is not good, which can cause the compressor to overheated. In order to maintain stable system operation, the opening degree of the expansion valve is controlled to increase the refrigerant circulation amount, thereby facilitating the condensation heat exchange on the 2nd stage system. We have found that the most suitable refrigerant circulation amount is found by stabilizing the operation of the system while lowerning the super low temperature from -65℃ to -70℃ and increasing again to -60℃.
Abstract
This Study is carried out to stabilize the system according to the change of superheat and subcooling in binary refrigeration system by applying cascade system. When the system on 1st stage was started and the system on the other side was operated, a temperature reversal phenomenon occurred in which the temperature of the 1st cascade outlet was temporarily lowered. This means that the condensate heat exchange on the 2nd is not good, which can cause the compressor to overheated. In order to maintain stable system operation, the opening degree of the expansion valve is controlled to increase the refrigerant circulation amount, thereby facilitating the condensation heat exchange on the 2nd stage system. We have found that the most suitable refrigerant circulation amount is found by stabilizing the operation of the system while lowerning the super low temperature from -65℃ to -70℃ and increasing again to -60℃.
참고문헌 (7)
- C. S. Kim, "A study on the generation system of super low temperature", Journal of the Korean Society of Mechanical Technology, 8(3), pp.1~7 (2006)
- Park, S. N., "Performance of autocascade refrigeration system using carbon dioxide and R134a", Korea J, of Air-Conditioning and Rrefrigeration Eng, 11(6), pp.880~890 (1999)
- 노건상, "자연 냉매를 이용하는 이원 냉동시스템의 성능 예측", 한국기계기술학회지, 12(3), pp.45~51 (2010), 한국기계기술학회[DOI]
- Chul Su Kim, "A Study on Characteristics of Cold Energy and Optimum Design of Mechatronics System with Super Low Temperature", pp.1~22 (2007)
- Satoshi Takahashi, "Invertor room air conditioner", Refrigeration in Japanese, 61(701), pp.27~30 (1986)
- Matusuokan E., "Dynamic response and electrical control for the air conditioner", Transactions of Refrigeration in Japanesen, 5(1), pp.43~54 (1988)
- Tassou, S.A., "Investigation of the effects of thermaotatic and electronic expansion valves on the steady state and transient performance of commercial chillers", Rev. Int. Froid, 16(1), pp.49~55 (1993)[DOI]