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CO<sub>2</sub> 트윈 로타리 압축기의 흡입관로에서의 가스맥동 해석
김우영,안종민,김현진,조성욱,Kim, Woo-Young,Ahn, Jong-Min,Kim, Hyun-Jin,Cho, Sung-Oug 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8
For a $CO_2$ one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.
미끄럼 조건에 따른 로터리 압축기 베인/롤러 표면의 마찰 마멸 특성
오세두(Se-Doo Oh),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2004 한국윤활학회지(윤활학회지) Vol.20 No.6
One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test, friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amounts of friction and wear between roller and vane surfaces.
CO₂ 냉매와 윤활유 환경하에서 코팅된 베인의 마찰 및 마멸특성에 관한 실험적 연구
오세두(Se-Doo Oh),정성훈(Sung-Hoon Jeong),안태식(Tae-Shik Ahn),박정민(Jung-Min Park),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
The CO₂ was investigated as an alternative refrigerant to replace HFC (hydrofluorocarbons) refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO₂ are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, wear volumes of vane surfaces applied various coatings were compared. Test results showed that WC/C and CrN coatings showed good tribological properties. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO₂ environment.
오일 용해도를 고려한 CO2 트윈 로타리 압축기 성능해석
김우영(Woo Young Kim),안종민(Jong Min Ahn),김현진(Hyun Jin Kim),조성욱(Sung Oug Cho) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
For a CO2 two-stage twin rotary compressor used for heat pump water heater system, changes of CO2 solubility in PAG oil were investigated along the gas passages from the first stage suction to final discharge. Only slight changes in solubility took place in suction chambers for both of the first and second stages, but for compression chambers, solubility variation ranged from 0.115 to 0.136, and from 0.133 to 0.182, respectively for the first and second stages. Calculation of gas flashing in parts of leakage oil flows and of oil contained in control volumes due to solubility changes was conducted and included in gas pressure calculation. For second stage, gas flashing amounts to around 5%-6% for most leakage flows. Cooling capacity, compressor input, and COP obtained by calculation were well compared to measurement results.
CO₂ 트윈 로타리 압축기의 흡입관로에서의 가스맥동 해석
김우영(Woo Young Kim),안종민(Jong Min Ahn),김현진(Hyun Jin Kim),조성욱(Sung oug Cho) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8
For a CO₂ one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.
김호영(Ho Young Kim),안종민(Jong Min Ahn),김현진(Hyun Jin Kim),조성욱(Sung Oug Cho) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.1
Relatively low cycle performance of a conventional CO₂ system is partly due to significant increase in friction loss in the expansion process, since the pressure drop across the expansion device is considerably large compared to a conventional refrigeration cycle. To recover friction loss and increase refrigeration effect by providing isentropic expansion, a rotary vane type expander has been designed. Performance of the designed expander has been investigated by numerical simulation. With the pressure condition of 9 ㎫/4.5 ㎫ and inlet temperature of 35 ℃, volumetric, isentropic, and mechanical efficiencies of the expander are calculated to be 58.1%, 101.1%, and 78.8%, respectively, resulting in total expander efficiency of 46.3%. With this expander, COP of a CO₂ refrigeration cycle is estimated to be improved by about 14%.