http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
트윈 로타리 압축기 Y-형 흡입 유로의 가스 유동특성에 관한 연구
민병채(Byung-Chae Min),노기율(Ki-Youl Noh),최경민(Gyung-Min Choi) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Refrigerant flow through a Y-shape suction port in a twin rotary compressor is analyzed by CFD simulation. A Y-shape suction port is installed at a partition plate between an upper cylinder and a lower cylinder for simple structure and efficient supply of the refrigerant into two cylinders. The transient simulation is conducted to analyze flow characteristics at a Y-shape suction port by using Ansys 14.0. To find optimal design of a Y-shape suction port, the influence of port diameter, branch angle. The effects of these factors for the suction gas flow are evaluated by comparison of mass flow rate flowing into individual cylinders.
김민기(Min Gi Kim),민병채(Byung Chae Min),하귀석(Kwi Seok Ha),배성원(Sung Won Bae),최경민(Gyung Min Choi),정재준(Jae Jun Jeong) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.6
원자력 열수력 계통 코드 MARS는 원자력발전소의 설계 및 안전성 분석을 위해 개발된 것이다. 이 코드는 다양한 기기로 구성된 열수력 계통의 2상 유동을 일반적으로 모델링할 수 있는 장점이 있으며, 원자력 계통의 정상 및 과도 상태 2상 유동(two-phase flow) 거동 예측에 탁월한 성능을 갖고 있다. 그런데, MARS 코드는 원자력발전소 계통 해석을 위해 개발되었으므로 냉동 사이클에 바로 적용할 수는 없다. 본 연구에서는 MARS 코드를 냉동 사이클 해석에 활용하기 위해 먼저 냉매(R-410A)의 물성치와 압축기 모델을 MARS 코드에 구현하였다. 그 다음, 수정된 MARS 코드로 R-410A의 비등 및 응축 열전달 실험을 해석하여 코드의 열전달 예측 성능을 평가하였다. 이어서 MARS 코드로 멀티 시스템 에어컨 실험을 모의하여 냉동 사이클 적용성을 고찰하였다. 평가 결과, MARS 코드의 냉동 사이클 적용성을 보였으며 아울러 향후 개선 사항 등을 도출하였다. The MARS code is a thermal-hydraulic system analysis code developed for the design and safety analysis of a water-cooled nuclear power plant. It can realistically predict two-phase flow behaviors in a complicated thermal-hydraulic system and can be used for both steady-state and transient calculations. In this work, to utilize the advantages of the MARS code for the refrigeration cycle analysis, we have implemented the thermodynamic property of a refrigerant (R-410A) and a compressor model into the MARS code. Subsequently, we have assessed the MARS model, which was originally developed for water, for boiling and condensation of the refrigerant. Furthermore, we have evaluated the code using experimental data from a multi-system air-conditioner. It is shown that MARS can predict transient behaviors of the refrigeration cycle reasonably well. The limitations of the code and improvements to be made have also been identified.
지한결(Han Gyeol Ji),민병채(Byung Chae Min),김형준(Hyeong Jun Kim),최경민(Gyung Min Choi) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This paper is a study on the heat transfer analysis of a linear compressor for domestic refrigerators. An analytical model was developed with the lumped thermal conductance approach. The linear compressor was divided into 91 simplified elements and each was assumed to have uniform thermodynamic Properties. To verify the numerical analysis, an experiment was conducted at steady state. The results of the numerical analysis showed good agreement with the experimental data. The temperature of suction muffler inlet increases because of leakage from valve and mixing refrigerant at suction muffler entrance.
롤링 피스톤형 로타리 압축기에서의 롤러와 실린더 간극 간 누설 유량 예측
김건우(Geon-woo Kim),노기율(Ki-youl Noh),민병채(Byung-chae Min),송상진(Sang-jin Song),나상경(Sang-kyung Na),윤태승(Tae-seung Yoon),양장식(Jang-sik Yang),최경민(Gyung-min Choi),김덕줄(Duck-jool Kim) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Functional formula of the flow coefficients for the radial clearance in a rolling piston rotary compressor was developed by the experiments and CFD (Computational Fluid Dynamics) to improve the accuracy of a compressor performance simulation. The experiments and CFD simulation were conducted to obtain the flow coefficients at the radial clearance with the assumptions of incompressible flow and steady state. The experiments were carried out with the variation of pressure ratio and low upstream pressure using the nitrogen as a working fluid. The validated CFD model was adopted to calculate the flow coefficients with change area of the radial clearance and high upstream pressure. The functional formula obtained from the results of the CFD calculation was applied to compressor performance simulation for calculating the leakage through the radial clearance. The results of compressor simulation with the functional formula showed tolerable errors with the experimental data of the compressor calorimeter in terms of EER (Energy Efficiency Ratio). Thus, the function of the flow coefficients may be acceptable for prediction of leakage through the radial clearance under the various conditions.
리니어 압축기를 적용한 냉장고 사이클의 냉동 부하변동에 따른 운전특성에 관한 연구
윤태승(Tae-Seung Yoon),송상진(Sang-Jin Song),민병채(Byung-Chae Min),김건우(Geon-woo Kim),나상경(Sang-kyung Na),최경민(Gyung-Min Choi) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
An experimental investigation on effects of variation of ambient temperature and compressor stroke in a refrigerator was conducted with a linear compressor. The refrigerant of 115g was charged from the results of comparing the power consumption and on-time ratio with different refrigerant charge amount. The cooling capacity of a linear compressor was increased with the ambient temperature increase due to ability of self-modulation of the compressor. The power consumption and cooling time were compared with variation of the cooling capacity of a linear compressor from 60% to 100%. As a result, the power consumption of a linear compressor was reduced by 22.4% with the compressor capacity increase. However, on-time ratio was increased by 11.3%.
운전조건변화에 따른 트윈 로터리 압축기의 기계손실 분석
신명수(Myeong Su Shin),나상경(Sang Kyung Na),민병채(Byung Chae Min),최윤혁(Yun Hyuk Choi),최경민(Gyung Min Choi) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This paper is a study on the mechanical loss of the twin rotary compressor with evaporating temperature and condensing temperature. The simulation results were verified by the manufacturer data. Cooling capacity and compressor input power were consistent with the manufacturer data within 4.59 and 6.79 %, respectively. Total mechanical loss increase with an increase of evaporating pressure and condensing pressure. The loss between vane and vane slot and the loss between roller and eccentric have a large portion on total mechanical loss.