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    Wyświetlanie 1-4 z 4
    Tytuł:
    Working Fluid Selection for Simple and Recuperative Organic Rankine Cycle Operating Under Varying Conditions: A Comparative Analysis
    Autorzy:
    Igbong, Dodeye
    Nyong, Oku E.
    Enyia, James
    Agba, Ambrose
    Powiązania:
    https://bibliotekanauki.pl/articles/2023504.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    organic rankine cycle
    organic working fluid
    supercritical
    exergy
    organiczny cykl Rankine'a
    organiczne ciecze robocze
    nadkrytyczny
    egzergia
    Opis:
    The selection of suitable working fluid for simple and recuperative organic Rankine cycle (ORC) operating under subcritical, superheated and supercritical conditions are investigated. 11 fluids with critical temperature above 1500C are considered as potential candidates. Performance screening parameters such as net power output, thermal efficiency, turbine sizing parameter (SP) and volumetric flow ratio (VFR), exegetic parameters like irreversibility rate, fuel depletion ratio, and improvement potential rate of exergy destruction were also evaluated. Results indicate that R600a, R236fa and R1233dz(E) demonstrated the best performance for subcritical, superheated and supercritical simple ORC, respectively. R236fa and R1233dz(E) proved more suitable for subcritical/superheated and supercritical recuperative cycles, respectively. The system exegetic efficiency is reveal to be significantly higher in subcritical/superheated (61-65%) cycles compared to the supercritical (35-45%) cycle, the evaporator seen as the main source of exergy destruction, accounting for 17-37% of inlet exergy destroyed and about 8-24% in the turbine.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 4; 202-221
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD study of the Effect of Piston Crevice Volume on the Temperature Distribution in a Rapid Compression Machine
    Autorzy:
    Nyong, Oku E.
    Ebieto, Celestine
    Bassey, Ene Ekpo
    Azorshubel, Ikem
    Powiązania:
    https://bibliotekanauki.pl/articles/103096.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rapid compression machine
    CFD
    crevice piston
    piston stroke
    optimisation
    maszyna do szybkiej kompresji
    tłok szczelinowy
    skok tłoka
    optymalizacja
    Opis:
    One of the conditions for controlling the aerodynamics in the reaction chamber is designing a crevice volume on the surface of the piston head. The importance of the crevice volume is to contain the cool boundary layers generated as a resulting of the moving reactor piston. However, this crevice volume consequently drops the end gas pressure and temperature at the end of the stroke. The CFD study of the aerodynamic effect of a piston movement in a reaction chamber was modelled using the commercial code of Ansys Fluent and assuming a 2-Dimensional computational moving mesh. A starting optimal crevice volume of 282 mm3 was used for further optimisation. This resulted in five crevice lengths of 3 mm, 5 mm, 7 mm, 9 mm and 12 mm, respectively. The crevice height of 5 mm was found to improve the compressed gas pressure at the end of the stroke to about 2 bar and temperature about 17.7 K and also maintained a uniform temperature field, while that of 12 mm had the least peak compressed gas pressure. This study investigated the possible means of improving the peak pressure and temperature drop in a rapid compression machine by further optimisation of the crevice volume.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 1; 46-51
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predicting Soil Erosion with Estimation of Saturated Hydraulic Conductivity from Soil Porosity: A Strategy for Meeting the SDG Goal Two and Six
    Autorzy:
    Adiaha, M. S.
    Oku, E. E.
    Chude, V. O.
    Nwaka, G. I. C.
    Ukem, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1046534.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Human development
    Hydraulic conductivity
    Hydro-physical
    SDG
    Soil erosion
    Opis:
    For years now, the continual degradation of soils in the tropics, and around the globe has continued to be one of the challenges facing humankind. Soil erosion is one of the factors gearing low food production, environmental pollution and degradation, acting like an hindrance towards the realization of the Sustainable Development Goals (SDGs) two (zero hunger) including SDG six (clean water and sanitation). The importance of saturated hydraulic conductivity (Ks) of a soil to Agriculturist, Environmentalist including Engineers cannot be exhausted, as this single hydro-physical soil property controls many processes in the soil system. An experiment was conducted to access the vulnerability of University of Abuja soils to erosion. Result of data analysis proves that the saturated hydraulic conductivity of the soils is slow to extremely slow with value recorded at (0.89 – 4.50 mm hr-1). Field data outcome presents a view that the soils of the area is mostly very compact to compact, with porosity value ranging from (1 – 21%). Saturated hydraulic conductivity estimation was done using hydro-physical models. The performance of the models were evaluated using Root Mean Square Error (RMSE) statistics. Outcome of the model comparation proves the two model as been able to effectively estimate the water flux of the area, presenting RMSE values at (5.67 and 2.41 respectively for the two models). The study thus concluded that for loss of arable land to be minimized or avoided and for environmental sustainability, ecological tool like planting of grasses including trees can be employed to salvage the impending case of soil erosion in the area.
    Źródło:
    World Scientific News; 2019, 136; 194-225
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epidemiology of tree-hole breeding mosquitoes in the tropical rainforest of Imo State, South-East Nigeria
    Autorzy:
    Anosike, J C
    Nwoke, B.E.B.
    Okere, A.N.
    Oku, E.E.
    Asor, J.E.
    Emmy-Egbe, I.O.
    Adimike, D.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/50771.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    ecology
    South-East Nigeria
    yellow fever
    mosquito
    epidemiology
    tree hole
    Nigeria
    human disease
    Imo State
    forest reserve
    disease vector
    rural area
    tropical region
    Opis:
    The study of tree-hole breeding mosquitoes was carried out in the tropical rainforest of Imo State Nigeria (two rural areas and two forest reserves in some parts of Orlu Senatorial Zone) between May – October 2002. Using standard entomological procedures, two macrohabitats (natural tree-holes and bamboo traps) and two microhabitats (leaf axils of cocoyams/pineapples and leaf axils of plantain/banana) were sampled for various mosquito species. Mosquitoes were recovered from all the various biotypes sampled. Types of mosquitoes species encountered, their relative abundance, as well as genera varied signifi cantly during the study (p<0.05). Four genera of mosquitoes: Aedes, Culex, Anopheles and Toxorhynchites were recovered while 16 species of mosquitoes encountered include: Aedes aegypti, Ae. africanus, Ae. simpsoni, Ae. albopictus, Ae. stokesi, Ae. taylori, Ae. apicoargenteus, Culex quinquefasciatus, Cx. nebulosus, Cx. trigripes, Cx. decens, Anopheles gambiae, An. funiestus, An. coustani and Toxorhynchites viridibasis. Most of the mosquitoes showed oviposition preferences for one or more habitats. The presence of Ae. africanus, Ae. simpsoni and Ae. aegypti indicate that the study areas were at risk of yellow fever epidemic. The presence of Anopheles and Culex species ensured endemicity of malaria and fi lariasis, while the recovery of Ae. albopictus in this region suggests a possible outbreak of dengue fever in future if not properly controlled.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2007, 14, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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