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Predrag Stojan Hrnjak - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of oil annular mist flow in the compressor Discharge Pipe
    International Journal of Refrigeration-revue Internationale Du Froid, 2019
    Co-Authors: Jiu Xu, Predrag Stojan Hrnjak
    Abstract:

    Abstract Oil is essential to the compressor, but oil brings side effects on the heat exchanger performance. It is preferred to reduce the amount of oil circulating in the system and retain the oil in the compressor for both reliability and efficiency reasons. Oil leaves the compression chamber in the form of mist. Oil droplets are propelled by refrigerant vapor flow and form a developing annular-mist flow in the Discharge Pipe, as droplets gradually attach to the inner wall. In this paper, a video-based method to quantify the oil flow in the compressor Discharge Pipe is presented. Oil droplet size, oil droplet velocity, oil film thickness, and oil film wave velocity are measured at different mass flow rates and compressor speed. The measurements show a variety of oil flow parameters as functions of distance along the Discharge Pipe. The impact of system flow rate, compressor type, and oil properties are also discussed. The characteristics of oil Discharged by the compressor provide essential information for oil separator design and optimization. The research approach also has the potential to be applied in other multiphase studies.

  • quantification of flow and retention of oil in compressor Discharge Pipe
    International Journal of Refrigeration-revue Internationale Du Froid, 2017
    Co-Authors: Jiu Xu, Predrag Stojan Hrnjak
    Abstract:

    This paper presents a new method to measure the oil retention and oil circulation ratio (OCR) in the compressor Discharge Pipe based on oil film thickness, oil film average velocity, oil droplet size, oil droplet velocity, and system mass flow rate. Oil flow parameters are quantified based on visualization using high-speed camera and video processing techniques. The estimated oil retention and oil circulation ratio results are compared quantitatively with the results from sampling measurements under different compressor speed and compressor types. The agreement between video results and sampling measurements verify the accuracy of this innovative method, which can also be applied in other annular-mist flow analysis. It also shows that most of the oil exists in film by mass while oil droplets contributes more to the oil mass flow rate because oil droplets travel in a much higher speed.

Jiu Xu - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of oil annular mist flow in the compressor Discharge Pipe
    International Journal of Refrigeration-revue Internationale Du Froid, 2019
    Co-Authors: Jiu Xu, Predrag Stojan Hrnjak
    Abstract:

    Abstract Oil is essential to the compressor, but oil brings side effects on the heat exchanger performance. It is preferred to reduce the amount of oil circulating in the system and retain the oil in the compressor for both reliability and efficiency reasons. Oil leaves the compression chamber in the form of mist. Oil droplets are propelled by refrigerant vapor flow and form a developing annular-mist flow in the Discharge Pipe, as droplets gradually attach to the inner wall. In this paper, a video-based method to quantify the oil flow in the compressor Discharge Pipe is presented. Oil droplet size, oil droplet velocity, oil film thickness, and oil film wave velocity are measured at different mass flow rates and compressor speed. The measurements show a variety of oil flow parameters as functions of distance along the Discharge Pipe. The impact of system flow rate, compressor type, and oil properties are also discussed. The characteristics of oil Discharged by the compressor provide essential information for oil separator design and optimization. The research approach also has the potential to be applied in other multiphase studies.

  • quantification of flow and retention of oil in compressor Discharge Pipe
    International Journal of Refrigeration-revue Internationale Du Froid, 2017
    Co-Authors: Jiu Xu, Predrag Stojan Hrnjak
    Abstract:

    This paper presents a new method to measure the oil retention and oil circulation ratio (OCR) in the compressor Discharge Pipe based on oil film thickness, oil film average velocity, oil droplet size, oil droplet velocity, and system mass flow rate. Oil flow parameters are quantified based on visualization using high-speed camera and video processing techniques. The estimated oil retention and oil circulation ratio results are compared quantitatively with the results from sampling measurements under different compressor speed and compressor types. The agreement between video results and sampling measurements verify the accuracy of this innovative method, which can also be applied in other annular-mist flow analysis. It also shows that most of the oil exists in film by mass while oil droplets contributes more to the oil mass flow rate because oil droplets travel in a much higher speed.

Yingjie Wang - One of the best experts on this subject based on the ideXlab platform.

  • gas injection and brine Discharge in rock salt gas storage studied via numerical simulation
    PLOS ONE, 2018
    Co-Authors: Yingjie Wang
    Abstract:

    : Underground gas storage in rock salt is of great importance for peak-shaving and emergency gas supply. This paper addressed an actual rock salt underground gas storage facility in Jiangsu province, China, as the research project and carried out the following research centered on a detailed geological model, a salt cavern model and the process of gas injection and brine Discharge. First, based on the theory of gas-liquid two-phase flow, the authors established a relationship between brine flow and natural gas bubbles under high pressure in the process of brine Discharge. Second, the effect of Pipe depth on the gas injection and brine Discharge was simulated. The objective was mainly to choose the best combination of Pipe depth and rate of brine Discharge flow based on analysis of the relationship between the brine Discharge Pipe depth and the flow rate of the residual brine, and the optimal rate was given according to different distances. Third, the effect of residual brine on the gas injection and brine Discharge was analyzed. The relationship curves between the maximum velocity on the surface of brine and the distance from the lower end of the brine Discharge Pipe to the bottom of the gas storage were obtained, and reasonable rates were suggested under different actual working conditions.

Antoni Garciarubies - One of the best experts on this subject based on the ideXlab platform.

  • effect of brine Discharge from a desalination plant on macrobenthic communities in the nw mediterranean
    Marine Environmental Research, 2006
    Co-Authors: Nuria Raventos, Enrique Macpherson, Antoni Garciarubies
    Abstract:

    This paper examines the possible effects of Discharges from a desalination plant on the macrobenthic community inhabiting the sandy substratum off the coast of Blanes in Spain (NW Mediterranean) using multivariate and univariate analyses. Two controls and one putatively impacted location were selected and visual censuses were carried out 12 times before and 12 times after the plant had begun operating. No significant variations attributable to the brine Discharges from the desalination plant were found. The failure to record any impact may be explained by the high natural variability that is a characteristic feature of bottoms of this type and also by the rapid dilution undergone by the hypersaline brine upon leaving the Discharge Pipe.

Piotr Cyklis - One of the best experts on this subject based on the ideXlab platform.

  • the application of nozzles for the attenuation of volumetric compressor pressure pulsation
    International Journal of Refrigeration-revue Internationale Du Froid, 2018
    Co-Authors: Przemyslaw Mlynarczyk, Piotr Cyklis
    Abstract:

    Abstract The attenuation of pressure pulsation is an important issue in air, gas and refrigeration installations due to noise generation and its influence on compressor power and reliability. In modern refrigeration systems, variable rotational speed of the compressor makes this task even more demanding. The application of specially shaped nozzles enables pressure pulsation reduction without significantly increasing the flow resistance. The key issue is the selection of nozzles of appropriate shapes and dimensions in order to achieve both effects. A simplified theoretical method based on the transmittance approach is presented in this paper. The simulation results are compared with experimental pressure pulsation measurements taken in the Discharge Pipe of a screw compressor.