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    Wyświetlanie 1-3 z 3
    Tytuł:
    Vapordynamic thermosyphon – heat transfer two-phase device for wide applications
    Autorzy:
    Vasiliev, L.
    Zhuravlyov, A.
    Shapovalov, A.
    Rodin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240265.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermosyphon
    vapordynamic thermosyphon
    long horizontal condenser
    porous coating
    heat transfer intensification
    termosyfon
    powłoka porowata
    intensyfikacja wymiany ciepła
    Opis:
    Vapordynamic thermosyphon (VDT) is an efficient heat transfer device. The two-phase flow generation and dynamic interaction between the liquid slugs and vapor bubbles in the annular minichannel of the VDT condenser are the main features of such thermosyphon, which allowed to increase its thermodynamic efficiency. VDT can transfer heat in horizontal position over a long distance. The condenser is nearly isothermal with the length of tens of meters. The VDT evaporators may have different forms. Some practical applications of VDT are considered.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 4; 65-76
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness
    Autorzy:
    Andrzejczyk, R.
    Muszyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240706.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    effectiveness
    heat transfer intensification
    number of transfer unit
    helical coil
    skuteczność
    intensyfikacja wymiany ciepła
    liczba jednostek przesyłowych
    spirala
    Opis:
    The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow nside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current- and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 137-159
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric study of fluid flow and heat transfer over louvered fins of air heat pump evaporator
    Autorzy:
    Muszyński, T.
    Kozieł, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240658.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat exchangers
    heat transfer intensification
    CFD
    convection
    air source heat pump
    wymienniki ciepła
    intensyfikacja wymiany ciepła
    konwekcja
    powietrzne pompy ciepła
    Opis:
    Two-dimensional numerical investigations of the fluid flow and heat transfer have been carried out for the laminar flow of the louvered fin-plate heat exchanger, designed to work as an air-source heat pump evaporator. The transferred heat and the pressure drop predicted by simulation have been compared with the corresponding experimental data taken from the literature. Two dimensional analyses of the louvered fins with varying geometry have been conducted. Simulations have been performed for different geometries with varying louver pitch, louver angle and different louver blade number. Constant inlet air temperature and varying velocity ranging from 2 to 8 m/s was assumed in the numerical experiments. The air-side performance is evaluated by calculating the temperature and the pressure drop ratio. Efficiency curves are obtained that can be used to select optimum louver geometry for the selected inlet parameters. A total of 363 different cases of various fin geometry for 7 different air velocities were investigated. The maximum heat transfer improvement interpreted in terms of the maximum efficiency has been obtained for the louver angle of 16° and the louver pitch of 1.35 mm. The presented results indicate that varying louver geometry might be a convenient way of enhancing performance of heat exchangers.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 3; 45-62
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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