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    Wyświetlanie 1-4 z 4
    Tytuł:
    Exergy analysis of operation of two-phase ejector in compression refrigeration systems
    Autorzy:
    Dudar, A.
    Butrymowicz, D.
    Śmierciew, K.
    Karwacki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240804.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase ejector
    compression refrigeration system
    COP
    exergy
    strumienica dwufazowa
    egzergia
    Opis:
    Paper deals with theoretical analysis of possible efficiency increase of compression refrigeration cycles by means of application of a two-phase ejector. Application of the two phase ejector in subcritical refrigeration system as a booster compressor is discussed in the paper. Results of exergy analysis of the system operating with various working fluids for various operating conditions have been shown. Analysis showed possible exergy efficiency increase of refrigeration compression cycle.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 4; 107-122
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical vapour compression refrigeration system: review part 1: environment challenge
    Autorzy:
    Mahmood, Raid Ahmed
    Ali, Omar M.
    Noor, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839710.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    czynnik chłodniczy
    układ chłodniczy
    warstwa ozonowa
    alternative refrigerant
    mixture refrigerants
    vapour compression refrigeration system
    ozone depletion potential
    global worming potential
    R507A refrigerant
    natural refrigerant
    R-718 (water/steam)
    Opis:
    In Australia and others developed countries, concerns about global warming have increased, and these concerns influence the use of refrigerants as working fluids in mechanical vapour compression refrigeration systems. One of the most important aspects of refrigerant selection is to reduce its impact on the environment and the ozone layer. This paper provides a comprehensive review of various theoretical and experimental studies which have been carried out on air conditioning and refrigeration applications to investigate the effect of refrigerants on the environment. The analysis in this paper reveals that alternative refrigerants are the most suitable working fluids that can be used in refrigeration systems to meet the needs of the environment. This study also suggests that natural types of refrigerants such as water, carbon dioxide, and hydrocarbon will play a significant role in protecting the environment and providing alternative friendly refrigerants to be used in refrigeration and air conditioning systems.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 130-147
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Year-round operation the solar powered hybrid adsorption-compression refrigeration cycle
    Autorzy:
    Cyklis, Piotr
    Duda, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/95366.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    hybrid compression adsorption refrigeration cycle
    refrigeration cycle
    hybrydowy adsorpcyjno-sprężarkowy system chłodniczy
    system chłodniczy
    Opis:
    In our earlier papers a hybrid adsorption-compression refrigeration cycle was presented. The hybrid, two stages cycle is based only on the natural refrigerants: water and carbon dioxide. The main advantage of the hybrid cycle is that the carbon dioxide compression cycle is subcritical because during the year-round operation it is possible to maintain the condensing temperature below 20°C. During the hot season, this is achieved by adsorption cooling, during cold seasons the wet cooling tower is sufficient. Already several years of experience, allowed to gather a considerable amount of measurement data. The refrigeration system is working in our laboratory constantly since 2013. In 2015 the adsorption system was upgraded by the manufacturer. In 2017 frequency inverter for wet tower fan controlling was introduced. The refrigeration chamber was used for tests with different content and operation of the refrigeration chamber (loading and unloading). The assumed CO2 evaporating temperature was -35°C. The averaged for HT (High Temperature) part of the cascade (adsorption cycle only) COPHT=0.51 for the whole year 2018. This may be considered a very good performance. Averaged total COP for the cascade system: COP=0.9 compared to COP=0.84 for compression only refrigeration cascade, with much higher TEWI index. For comparison for two-stage compression (R407CHT+R744LT) cycle was used. This means that if the cooling tower fan operation is controlled using an inverter, adjusted to the actual heat removal demand, the hybrid cycle is not only ecological but also energetically efficient.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2019, 3, 4; 317-322
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of mechanical vapour compression refrigeration system part 2: performance challenge
    Autorzy:
    Mahmood, R. A.
    Ali, O. M.
    Al-Janabi, A.
    Al-Doori, G.
    Noor, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106451.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    para
    układ chłodniczy
    współczynnik wydajności
    vapour compression
    refrigeration system
    cycle
    coefficient of performance COP
    Opis:
    Reducing energy consumption and providing high performance for a vapour compression refrigeration system are big challenges that need more attention and investigation. This paper provides an extensive review of experimental and theoretical studies to present the vapour compression refrigeration system and its modifications that can be used to improve system’s performance and reduce its energy consumption. This paper also presents the challenges that can be considered as a gab of research for the future works and investigations. Cooling capacity, refrigerant effect, energy consumption can be improved by using vapour injection technique, natural working fluid, and heat exchanger. Based on the outcome of this paper, vapour injection technique using natural refrigerant such as water can provide ultimate friendly refrigeration system. Future vision for the vapour compression refrigeration system and its new design technique using Computational Fluid Dynamic (CFD) is also considered and presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 119--130
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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