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- 주제어 : Ideal gas equation (이상 기체 상태 방정식) (검색결과 3 건)
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한인식(Insik Han),최교준(Kyojun Choi),김재용(Jaeyong Kim),이윤복(Yoonbok Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently the use of gas spring in the combat and commercial vehicle’s suspension is increasing. Because of its nonlinear characteristics, the gas spring can support wide range of dynamic loads and gives good ride quality. In design of gas spring, isothermal and adiabatic processes are applied generally, but those processes could not produce heat transfer effect in the simulation. So in this study, heat transfer differential equation and BWR/Ideal state equation are used to calculate the pressure of gas spring which is changing with time. The numerical analysis showed that the pressure of gas spring forms a hysteresis loop in the both of the state equations. The peak pressure value of BWR equation is 8% higher than that of Ideal equation. In the future study, test will be conducted to verify the accuracy of the BWR and Ideal state equations.
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노영진,김선화,이선기,강은철 한국동력기계공학회 2022 동력시스템공학회지 Vol.26 No.1
이 논문에서는 건물에너지 효율성 제고를 위해 히트펌프가 적용된 전열교환기에 대해 입출력 및 주변기기에 대한 열 및 물질수지를 분석하였다. 시스템에서 히트펌프가 적용되지 않은 모델과 히트펌프를 적용한 모델로 구분하였고, Peng-Robinson 식과 IDEAL 식을 이용하여 수치해석 모델을 통해 상대습도 35%, 40%, 45%의 결과를 비교 고찰하였다. 사용된 상태방정식에 따른 해석모델을 통해 열수지의 변동폭을 확인하였다. 이를 통해 전열교환기 운전모드, 히트펌프 냉매유량 및 상태방정식 종류에 따라 성능결과의 예측 변동폭을 가짐을 확인하였다. 이 논문에서는 히트펌프가 연계된 전열교환기의 설계시 전열교환기의 용량 뿐만 아니라 히트펌프 의 핵심부품인 압축기, 증발기, 응축기 등의 용량을 예측하는 방법론을 제안하였다..
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이동균(Dong Kyun Lee),김준수(Jun Soo Kim),박성우(Sung Woo Park),강성욱(Sung Wook Kang) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.11
In this study, a numerical analysis for predicting the internal pressure of the flight vehicle system with relief valve and N2-injection type cooler was conducted to operate the system safely in an unsteady-state condition. By adopting an incompressible ideal gas equation to computational domain at each time step, internal pressure was calculated without iteration. To increase the accuracy of the numerical analysis results, numerical model was correlated by modifying the volume of the computational domain. To modify the volume of computational domain, internal pressure along time was compared with experimental results. It showed good agreement within system operating time. Air mass flow rate at the relief valve is calculated by interpolating the performance curve data. For accurate and rapid calculation of the internal pressure in an unsteady-state condition, time step size convergence study was conducted additionally. By using a correlated numerical model, Pcr of the relief valve is conducted to remain the flight vehicle system within an internal pressure range of 0.6-2.0 atm, in each flight profile. Finally, specific Pcr of relief valve was applied to the system and the experimental results showed that the internal pressure remained in a safe range.
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