The Experts below are selected from a list of 429 Experts worldwide ranked by ideXlab platform

Vasko N. Šarevski - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary study of a novel R718 refrigeration cycle with single stage centrifugal compressor and two-phase Ejector
    International Journal of Refrigeration-revue Internationale Du Froid, 2014
    Co-Authors: Milan N. Šarevski, Vasko N. Šarevski
    Abstract:

    Abstract The paper describes the investigations of a novel R718 refrigeration cycle with single stage centrifugal compressor and two-phase Ejector as a second stage compression device. The limitations of the R718 centrifugal stage pressure ratio, connected with small molecular mass of the water and high isentropic exponent, result on high impeller peripheral speed, high Mach number and high discharge temperature. Reynolds number is low and dimensions of the compressor stage are large. The complex thermal and Flow phenomena inside two-phase Ejector Flow Field are investigated and performance characteristics are estimated. Although efficiency of the concept of compression with hydraulic pump and two-phase Ejectors is lower, the integration of two-phase Ejectors in the R718 centrifugal unit results in low cost high capacity refrigeration system with high energy efficiency, competitive with traditional refrigeration systems by environmental, technical and economical reasons.

Milan N. Šarevski - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary study of a novel R718 refrigeration cycle with single stage centrifugal compressor and two-phase Ejector
    International Journal of Refrigeration-revue Internationale Du Froid, 2014
    Co-Authors: Milan N. Šarevski, Vasko N. Šarevski
    Abstract:

    Abstract The paper describes the investigations of a novel R718 refrigeration cycle with single stage centrifugal compressor and two-phase Ejector as a second stage compression device. The limitations of the R718 centrifugal stage pressure ratio, connected with small molecular mass of the water and high isentropic exponent, result on high impeller peripheral speed, high Mach number and high discharge temperature. Reynolds number is low and dimensions of the compressor stage are large. The complex thermal and Flow phenomena inside two-phase Ejector Flow Field are investigated and performance characteristics are estimated. Although efficiency of the concept of compression with hydraulic pump and two-phase Ejectors is lower, the integration of two-phase Ejectors in the R718 centrifugal unit results in low cost high capacity refrigeration system with high energy efficiency, competitive with traditional refrigeration systems by environmental, technical and economical reasons.

Sarevski, Vasko Nikola - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary Study of a Novel Compact R718 Water Chiller With Integration of a Single Stage Centrifugal Compressor and Two-Phase Ejectors
    'Purdue University (bepress)', 2012
    Co-Authors: Sarevski, Milan Nikola, Sarevski, Vasko Nikola
    Abstract:

    A novel compact R718 water chiller with integration of a centrifugal compressor stage and two phase Ejectors as a second stage compression device is proposed. The paper describes the investigations of this R718 refrigerating cycle. The limitations of the R718 centrifugal compressor stage pressure ratio are discussed, and possibilities for introduction of two-phase Ejectors in the R718 refrigerating systems with direct evaporation and condensation are analyzed. The complex thermal and Flow phenomena connected with additional compression, desuperheating and condensation inside the two-phase Ejector Flow Field are investigated and performance characteristics are estimated. The thermodynamic processes are shown in pressure – enthalpy and temperature – entropy diagrams. Based on the described thermodynamic model, a computational procedure was generated to evaluate the performance characteristics of this R718 refrigerating unit. The implementation of the two-phase Ejector in the R718 centrifugal compressor refrigerating systems causes simplification of the R718 unit, and reduction of their size and cost. The energy efficiency of these refrigerating systems may also be increased

Sarevski, Milan Nikola - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary Study of a Novel Compact R718 Water Chiller With Integration of a Single Stage Centrifugal Compressor and Two-Phase Ejectors
    'Purdue University (bepress)', 2012
    Co-Authors: Sarevski, Milan Nikola, Sarevski, Vasko Nikola
    Abstract:

    A novel compact R718 water chiller with integration of a centrifugal compressor stage and two phase Ejectors as a second stage compression device is proposed. The paper describes the investigations of this R718 refrigerating cycle. The limitations of the R718 centrifugal compressor stage pressure ratio are discussed, and possibilities for introduction of two-phase Ejectors in the R718 refrigerating systems with direct evaporation and condensation are analyzed. The complex thermal and Flow phenomena connected with additional compression, desuperheating and condensation inside the two-phase Ejector Flow Field are investigated and performance characteristics are estimated. The thermodynamic processes are shown in pressure – enthalpy and temperature – entropy diagrams. Based on the described thermodynamic model, a computational procedure was generated to evaluate the performance characteristics of this R718 refrigerating unit. The implementation of the two-phase Ejector in the R718 centrifugal compressor refrigerating systems causes simplification of the R718 unit, and reduction of their size and cost. The energy efficiency of these refrigerating systems may also be increased

Jing Shudong - One of the best experts on this subject based on the ideXlab platform.

  • study on numerical simulation of Ejector Flow Field
    jOURNAL OF southwest University for Nationalities, 2006
    Co-Authors: Yang Yanqin, A N Zhiqiang, Jing Shudong
    Abstract:

    Hydrokinetics calculating software FLUENT is adopted to make numerical simulation to supersonic mixing process of air jet vacuum pump.Injecting pressure and outlet pressure to injection volume is analyzed.The performance of vacuum pump is also investigated by changing the dimension of the mathematical model.The result shows that the change of pressure of working air has a little influence on injection volume,that properties will not decrease greatly while working pressure varies,and that operating parameters has great influence on structure of wave system of Ejector.There are optimum throat area ratio and ideal nozzle position for a given operating condition.