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    Wyświetlanie 1-5 z 5
    Tytuł:
    New environmentally friendly low-pressure refrigerants mini-channel
    Autorzy:
    Sikora, Malgorzata
    Bohdal, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2204072.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    refrigerants
    global warming potential
    ozone depletion potential
    fluorinert liquid
    hydrofluoroether
    Opis:
    Nowadays, in addition to the thermodynamic properties of refrigerants, their impact on the environment is of high significance. Hence, it is important to use refrigerants with the lowest possible values of ozone depletion potential and global warming potential indices in refrigeration, organic Rankine cycle (ORC), air conditioning, and heat pump systems. Natural refrigerants are the most environmentally friendly; unfortunately, they have less favourable thermodynamic properties. Currently, low-pressure refrigerants from the FC (fluorocarbons, fluorine liquids) and HFE (hydrofluoroether) groups are increasingly used. This paper presents the most important properties and applications of selected refrigerants from these groups and also reviews the literature on their use.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 1; 89--104
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of boil-off gas (BOG) generation OF KC-1 membrane LNG tank with high density rigid polyurethane foam by numerical analysis
    Autorzy:
    Jeong, H.
    Shim, W. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/258466.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    boil-off gas
    KC-1 membrane
    LNG carrier
    rigid polyurethane foam
    ozone depletion potential
    Opis:
    Recently, a new type of LNG tank named “KC-1 membrane LNG tank” has been developed by Korean Gas Corporation (KOGAS), and Samsung Heavy Industries (SHI) is currently building KC-1 membrane type LNG carriers. Unlike other LNG tanks, the KC-1 membrane LNG tank has a single-insulation structure rather than a double-insulation structure. For a given tank’s boundary condition, heat transfer analysis is performed from the external to the internal environment of the LNG tank by numerical simulation for three tanks. In each tank, the main thermally resistant layer of insulation is assembled with a High density rigid Polyurethane Foam (H-PUF), which is blown with one of three different types of hydrofluorocarbons—namely—HFC-365mfc, 245fa, and 245fa-e (enhanced). Advantage of such blowing agents is that it has a lower Ozone Depletion Potential (ODP) than HCFC-141b or carbon dioxide ( ) that has been used in the past as well as having low thermal conductivity. A Reduced Order Model is utilized to a 3-dimensional section of the insulation to calculate equivalent thermal conductivity. The equivalent thermal conductivity of the insulation is then applied to the rest of LNG tank, reducing the size of tank simulation domain as well as computation time. Tank’s two external and internal boundary conditions used are those defined by the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC) and the United States Coast Guard (USCG) conditions. Boil-off Rate (BOR) of the tank that has the insulation with H-PUF blown with HFC-245fa resulted in 0.0927 %/day and 0.0745 %/day for IGC and USCG conditions, respectively.
    Źródło:
    Polish Maritime Research; 2017, 1; 100-114
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected problems of transport in port towns – tri-city as an example
    Autorzy:
    Budzyński, M.
    Ryś, D.
    Kustra, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259982.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    boil-off gas
    KC-1 membrane
    LNG carrier
    rigid polyurethane foam
    ozone depletion potential
    Opis:
    Port towns are strategic places from the point of view of transport systems. They form integration junctions for various transport branches , apart from the traditional - road and railway ones , also for water( sea) transport which is active there. Moreover, air transport comes also into consideration , whose efficient functioning must be connected with good accessibility, that concerns sea transport as well. Efficient and safe servicing the ports is crucial for their functioning. Problems associated with the overloading of lorries, which leads to degradation of road surface structure , observed in Gdynia, are discussed as an example in this paper. Problems of road traffic safety (RTS) are presented in this paper on the example of Gdańsk. The two issues : the road traffic safety and road surface degradation constitute only some transport problems of port towns , but they are very important, from the point of view of their specificity, for integration junctions of all the transport branches for people and goods. However, in discussing selected aspects of transport in port towns it is necessary to refer to the managing of integrated transport system with taking into account its traffic safety aspects.
    Źródło:
    Polish Maritime Research; 2017, S 1; 16-24
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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:
    Parametry charakteryzujące zagrożenia związane ze stosowaniem technologii gaszenia gazem
    Parameters characterizing the hazards associated with the use of gas extinguishing technology
    Autorzy:
    Boroń, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/136400.pdf
    Data publikacji:
    2018
    Wydawca:
    Szkoła Główna Służby Pożarniczej
    Tematy:
    stałe urządzenia gaśnicze gazowe
    gazy obojętne
    dwutlenek węgla
    chlorowcopochodne węglowodorów
    potencjał niszczenia warstwy ozonowej
    potencjał tworzenia efektu cieplarnianego
    czas życia gazu w atmosferze
    fixed gaseous extinguishing system
    inert gases
    carbon dioxide
    halogenated hydrocarbon
    ozone depletion potential
    global warming potential
    atmospheric life time
    Opis:
    W artykule scharakteryzowano parametry opisujące zagrożenia dla zdrowia i życia ludzi oraz środowiska naturalnego, wynikające ze stosowania gazowych środków gaśniczych. Ponadto omówiono metody zmierzające do ograniczenia oraz likwidacji możliwych zagrożeń.
    The article discusses the parameters describing the threats to the human health and life and to the natural environment, resulting from the use of gaseous extinguishing agents. The methods for the elimination or reduction of the threats, mentioned above, were described.
    Źródło:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2018, 3, 67; 7-16
    0239-5223
    Pojawia się w:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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