Ruangtrakoon, Natthawut

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Ruangtrakoon, Natthawut
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Email
natthawut.ru@kmitl.ac.th

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    Influence of grid distribution on CFD model of compressible flow inside the primary nozzle and mixing chamber used in refrigeration application
    (2018-08-14)
    Ruangtrakoon, Natthawut
    ;
    Bumrungthaichaichan, Eakarach
    In this study, the influence of grid distribution on CFD model of the primary nozzle and mixing chamber used in refrigeration application was primarily investigated. The only one geometry of primary nozzle and mixing chamber was modeled. The two different grid distributions, fine near-wall grid and regular grid with the identical total grid number, were simulated to investigate the flow phenomena inside the considered system. The appropriate boundary conditions and numerical methods were carefully employed. The simulated entrainment ratios obtained by two different grid arrangements were validated by comparing with the reliable experimental data. The results revealed that the Mach number distributions of these models were different. Further, the outlet total pressure predicted by fine near-wall grid was about 1.3% higher than that obtained by regular grid.
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    Comparison of traditional and CRMC ejector performance used in a steam ejector refrigeration
    (2017-01-01)
    Kitrattana, Borirak
    ;
    Aphornratana, Satha
    ;
    Thongtip, Tongchana
    ;
    Ruangtrakoon, Natthawut
    In this paper, performance of a steam ejector designed based on the constant rate of momentum change (CRMC) and traditional ejector were tested in an attempt to compare its performance. Three different ejectors were designed and constructed; traditional ejector with throat diameter of 19 mm, traditional ejector with throat diameter of 13.4 mm, and CRMC ejector with throat diameter of 13.4 mm. They were designed to be easily equipped with the 1kW experimental ejector refrigerator. The boiler saturation pressure was varied from 130°C to 140°. The evaporator saturation temperature were fixed at 7.5°C. The result show that at the same operating condition and the same ejector area ratio (the area ratio of nozzle throat to ejector throat), CRMC ejector provided higher entrainment ratio than the traditional ejectors while the critical condenser pressure remain the same.
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    Design of steam ejector in a refrigeration application based on thermodynamic performance analysis
    (2019-02-01)
    Ruangtrakoon, Natthawut
    ;
    Aphornratana, Satha
    This paper presents a theoretical calculation method for designing the steam ejectors for refrigeration applications. The working fluid is assumed to be an ideal gas. The flow processes inside the ejector are analyzed by using thermodynamic and ideal gas equations. The advantage of this paper is that the presentation of the theory and calculation procedure are very easy to understand and follow. A design criterion of a steam ejector is also provided. The experimental results at several operating conditions are used to validate the theoretical results. The validation results show that this calculation method can be used as an efficient tool in the design of steam ejectors.