The Experts below are selected from a list of 60225 Experts worldwide ranked by ideXlab platform
Ronald A. Ratti - One of the best experts on this subject based on the ideXlab platform.
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The dynamic effects of Oil Supply shocks on the US stock market returns of upstream Oil and gas companies
Energy Economics, 2018Co-Authors: Bradley T. Ewing, Wensheng Kang, Ronald A. RattiAbstract:Abstract A time-varying parameter VAR model is used to examine the impact of structural Oil Supply shocks on the US real stock market return of Oil and gas exploration and production companies. The result shows that the impact response of the real return of the upstream stocks to a negative world non-US Oil Supply shock increases substantially over recent years, from an average value of 0.70% in 2006 to 6.16% during 2008–2010, with a spike of 6.81% in 2014Q3. The endogenous effects of US Oil Supply shocks on the return play an important role, in that the responses of the stock returns to a negative US Oil Supply shock are positive and persistent with an average value of 3.60% over time. The time-varying effects of Oil Supply shocks are heterogeneous. The magnitudes of return responses are different among independents, large proved-reserve independents and integrated companies over time.
Bradley T. Ewing - One of the best experts on this subject based on the ideXlab platform.
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The dynamic effects of Oil Supply shocks on the US stock market returns of upstream Oil and gas companies
Energy Economics, 2018Co-Authors: Bradley T. Ewing, Wensheng Kang, Ronald A. RattiAbstract:Abstract A time-varying parameter VAR model is used to examine the impact of structural Oil Supply shocks on the US real stock market return of Oil and gas exploration and production companies. The result shows that the impact response of the real return of the upstream stocks to a negative world non-US Oil Supply shock increases substantially over recent years, from an average value of 0.70% in 2006 to 6.16% during 2008–2010, with a spike of 6.81% in 2014Q3. The endogenous effects of US Oil Supply shocks on the return play an important role, in that the responses of the stock returns to a negative US Oil Supply shock are positive and persistent with an average value of 3.60% over time. The time-varying effects of Oil Supply shocks are heterogeneous. The magnitudes of return responses are different among independents, large proved-reserve independents and integrated companies over time.
Xiaoxia Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of Oil stirrer on the performance of Oil Supply system for a variable speed rotary compressor
International Journal of Refrigeration-revue Internationale Du Froid, 2019Co-Authors: Yihao Zhu, Wei Sun, Mihoko Shimoji, Xiaoxia ChenAbstract:Abstract This paper presents an investigation regarding the effect of Oil stirrer on the performance of Oil Supply system for variable speed rotary compressors. Oil Supply rate for Oil pump with an Oil stirrer is calculated by means of numerical simulation. To validate the simulation model, a novel test rig is built to perform Oil flow rate measurements under different operating conditions. Good agreement between the simulation model and the experiment has been achieved. The results show that Oil Supply rate can be increased markedly with the help of Oil stirrer whereas stirrer heights and geometric structures do not cause significant variations in Oil pumping performance in the current situations of this research. Particularly, it is found that when the rotational speed is high enough, Oil Supply rate will stay stagnant or even depressed with an increase in rotational speed rather than simply increases with the speed.
Jianhua Wu - One of the best experts on this subject based on the ideXlab platform.
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Numerical study on Oil Supply system of a rotary compressor
Applied Thermal Engineering, 2013Co-Authors: Jianhua Wu, Gang WangAbstract:Abstract The Oil Supply system is a crucial reliability issue for rotary compressors. This paper provides a general method for analyzing the Oil Supply system of a rotary compressor by using computational fluid dynamics (CFD). The process includes establishing the physical model, dividing computational grid, setting boundary conditions, calculating leakage rates through the roller end clearances, translating the dynamic issue into the static issue and so on. Validation of the rationality of the Oil Supply system model has been made by the measurement of the main bearing Oil flow rates. The effects of operating conditions of the compressor, the Oil level height of the Oil sump and the main design parameters of the Oil Supply system on the Oil Supply characteristics are analyzed by numerical simulation. It is found that the main bearing Oil flow rate varies circularly along with the rotation of the shaft. The shape and inclination angle of the spiral groove also influence the main bearing Oil flow rate. The Oil leakage rates through the roller end clearances depend largely on the operating conditions. In addition, the Oil level height of the Oil sump has a huge effect on the total Oil flow rate.
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The Analysis of Oil Supply System for Twin-Cylinder Rotary Compressor
2011Co-Authors: Zhanli Zhai, Jianhua Wu, Ruihong MaAbstract:The analysis model of Oil Supply system was established for rotary compressor in this study. Oil Supply system was simulated by using a CFD software FLUENT. It gets the Oil Supply capacities through the shaft at different Oil levels in Oil sump. We have developed a CFD model for Oil Supply system of the rotary compressor including all components of the Oil Supply system and proposed a method to analyze it with CFD software including establishing the physical model, making some assumptions, setting boundary conditions. All these were validated by experiments. Then the Oil Supply system of S-80 compressor was studied and the Oil Supply rate of main bearing was obtained. In the original design, the Oil Supply rate is at the low Oil level. But in the actual extremely working ondition, the Oil Supply of main bearings will be lack.
Gang Wang - One of the best experts on this subject based on the ideXlab platform.
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Numerical study on Oil Supply system of a rotary compressor
Applied Thermal Engineering, 2013Co-Authors: Jianhua Wu, Gang WangAbstract:Abstract The Oil Supply system is a crucial reliability issue for rotary compressors. This paper provides a general method for analyzing the Oil Supply system of a rotary compressor by using computational fluid dynamics (CFD). The process includes establishing the physical model, dividing computational grid, setting boundary conditions, calculating leakage rates through the roller end clearances, translating the dynamic issue into the static issue and so on. Validation of the rationality of the Oil Supply system model has been made by the measurement of the main bearing Oil flow rates. The effects of operating conditions of the compressor, the Oil level height of the Oil sump and the main design parameters of the Oil Supply system on the Oil Supply characteristics are analyzed by numerical simulation. It is found that the main bearing Oil flow rate varies circularly along with the rotation of the shaft. The shape and inclination angle of the spiral groove also influence the main bearing Oil flow rate. The Oil leakage rates through the roller end clearances depend largely on the operating conditions. In addition, the Oil level height of the Oil sump has a huge effect on the total Oil flow rate.
