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    Wyświetlanie 1-5 z 5
    Tytuł:
    Mathematical modelling of tube heat exchangers with complex flow arrangement
    Autorzy:
    Taler, D.
    Trojan, M.
    Taler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185235.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wymiennik ciepła
    przepływ
    modelowanie
    heat tube exchanger
    modelling
    complex flow
    Opis:
    General principles of mathematical modelling of transient heat transfer in cross-flow tube heat exchangers with complex flow arrangements which allow a simulation of multipass heat exchangers with many tube rows are presented. First, a system of differential equations for the transient temperature of both fluids and the tube wall with appropriate boundary and initial conditions is formulated. Two methods for modelling heat exchangers are developed using the finite difference method and finite volume method. A numerical model of multipass steam superheater with twelve passes is presented. The calculation results are compared with the experimental data.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 1; 7-19
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers
    Autorzy:
    Butrymowicz, D.
    Karwacki, J.
    Kwidziński, R.
    Śmierciew, K.
    Gagan, J.
    Przybyliński, T.
    Skiepko, T.
    Łapin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185740.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    single blow technique
    rotating heat exchanger
    regenerator
    przenikania ciepła
    wymiennik ciepła
    Opis:
    The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed based on the modified single blow technique was presented and discussed in the paper. The methodology of this measurement approach dedicated to the matrix of the rotating regenerative gas heater was discussed in detail. The testing stand consisted of a dedicated experimental tunnel with auxiliary equipment and a measurement system are presented. Selected experimental results are presented and discussed for selected types of matrices of regenerative air preheaters for the wide range of Reynolds number of gas. The agreement between the theoretically predicted and measured temperature profiles was demonstrated. The exemplary dimensionless relationships between Colburn heat transfer factor, Darcy flow resistance factor and Reynolds number were presented for the investigated matrices of the regenerative gas heater.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 341-358
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat transfer in helical coil heat exchanger:An experimental parametric study
    Autorzy:
    Kowalski, Krzysztof
    Downarowicz, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/185443.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    helical coil
    heat exchanger
    condensation
    Wilson method
    laminar flow
    pressure drop
    wymiennik ciepła
    kondensacja
    Metoda Wilsona
    przepływ laminarny
    Spadek ciśnienia
    Opis:
    Helical coil heat exchangers are widely used in a variety of industry applications such as refrigerationsystems, process plants and heat recovery. In this study, the effect of Reynolds number and theoperating temperature on heat transfer coefficients and pressure drop for laminar flow conditions wasinvestigated. Experiments were carried out in a shell and tube heat exchanger with a copper coiledpipe (4 mm ID, length of 1.7 m and coil pitch of 7.5 mm) in the temperature range from 243 to 273 K.Air – propan-2-ol vapor mixture and coolant (methylsilicone oil) flowed inside and around the coil,respectively. The fluid flow in the shell-side was kept constant, while in the coil it was varied from 6.6to 26.6 m/s (the Reynolds number below the critical value of 7600). Results showed that the helicalpipe provided higher heat transfer performance than a straight pipe with the same dimensions. Theconvective coefficients were determined using the Wilson method. The values for the coiled pipe werein the range of 3–40 W/m2·K. They increased with increasing the gas flow rate and decreasing thecoolant temperature.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 1; 101--114
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modelling of thermal and flow processes in vertical ground heat exchangers
    Autorzy:
    Pater, S.
    Ciesielczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/952661.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vertical ground heat exchanger
    borehole
    geothermal heat pumps
    thermal and flow processes
    wymiennik ciepła
    odwiert
    geotermalne pompy ciepła
    procesy termiczne
    procesy przepływowe
    Opis:
    The main task of mathematical modelling of thermal and flow processes in vertical ground heat exchanger (BHE-Borehole Heat Exchanger) is to determine the unit of borehole depth heat flux obtainable or transferred during the operation of the installation. This assignment is indirectly associated with finding the circulating fluid temperature flowing out from the U-tube at a given inlet temperature of fluid in respect to other operational parameters of the installation. The paper presents a model of thermal and flow processes in BHE consisting of two analytical models separately-handling processes occurring inside and outside of borehole. A quasi-three-dimensional model formulated by Zeng was used for modelling processes taking place inside the borehole and allowing to determine the temperature of the fluid in the U-tube along the axis of BHE. For modelling processes occurring outside the borehole a model that uses the theory of linear heat source was selected. The coupling parameters for the models are the temperature of the sealing material on the outer wall of the borehole and the average heat flow rate in BHE. Experimental verification of the proposed model was shown in relation to BHE cooperating with a heat pump in real conditions.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 4; 523-533
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Thermal Calculations for a Condensing Waste-Heat Exchanger
    Autorzy:
    Rączka, P.
    Wójs, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185363.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odzysk ciepła kondensacji
    obliczanie transferu ciepła i masy
    wymiennik ciepła
    ciepło odpadowe
    condensation heat recovery
    calculation of heat and mass transfer
    heat exchanger
    waste heat
    Opis:
    The paper presents the algorithms for a flue gas/water waste-heat exchanger with and without condensation of water vapour contained in flue gas with experimental validation of theoretical results. The algorithms were used for calculations of the area of a heat exchanger using waste heat from a pulverised brown coal fired steam boiler operating in a power unit with a capacity of 900 MWe. In calculation of the condensing part, the calculation results obtained with two algorithms were compared (Colburn-Hobler and VDI algorithms). The VDI algorithm allowed to take into account the condensation of water vapour for flue gas temperatures above the temperature of the water dew point. Thanks to this, it was possible to calculate more accurately the required heat transfer area, which resulted in its reduction by 19 %. In addition, the influence of the mass transfer on the heat transfer area was taken into account, which contributed to a further reduction in the calculated size of the heat exchanger - in total by 28% as compared with the Colburn-Hobler algorithm. The presented VDI algorithm was used to design a 312 kW pilot-scale condensing heat exchanger installed in PGE Belchatow power plant. Obtained experimental results are in a good agreement with calculated values.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 4; 447-461
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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