Ruangtrakoon, Natthawut

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

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    Item type:Publication,
    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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    Item type:Publication,
    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.