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A comparative study for double pass solar air collector utilizing medial glass panel

Hussein Majeed Salih
Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 729-747 | DOI: 10.24425/ame.2022.141524
Słowa kluczowe solar air collector double-pass CFD finite volume thermal performance
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Abstrakt

A numerical investigation of thermal prediction of double-pass solar air heater of-counter flow is developed in the present study. The main idea of the current study is that the collector consists of two layers of glass so that the middle layer is glass instead of the usual metal plate. The performance of double-pass solar air heater is studied for a wide range of solar radiation intensities (600, 750 and 900 W/m 2). A FORTRAN-90 program is built to simulate the mathematical model of double-pass solar air heater based on solving steady state two-dimensional Navier-Stokes equations and energy equation based on finite volume method. Turbulence effect is simulated by two equations k-ε module. The results are compared with the results of a previous experimental study and a good agreement was found. From compression calculating efficiency of the present and traditional collector for each solar intensity, it was found that the efficiency of the current collector is higher than that of the traditional one, where the efficiency of the current collector at the solar intensity of (600, 750 and 900) W/m 2 are (0.529, 0.514 and 0.503), respectively, while those of the traditional collector (0.508, 0.492 and 0.481), respectively. In addition to this, the effect of the mass flow rate on the temperature difference of the current proposed collector was studied. Three values of the mass flow rate were studied (0.009,0.018, and 0.027) kg/s at solar intensity of 750 W/m 2. From this it was found that the temperature difference decreases with increasing mass flow rate. Accordingly, the efficiency decreases
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Bibliografia


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Autorzy i Afiliacje

Hussein Majeed Salih
1
ORCID: ORCID
  1. Electromechanical Engineering Department, University of Technology, Iraq

Mixed convection heat transfer of a nanofluid in a square ventilated cavity separated horizontally by a porous layer and discrete heat source

Hamdi Messaoud Sahi Adel Ourrad Ouerdia
Archives of Thermodynamics | 2023 | vol. 44 | No 2 | 87-114 | DOI: 10.24425/ather.2023.146560
Słowa kluczowe mixed convection Vented cavity Porous layer Finite volume method
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Abstrakt

Laminar mixed convection heat transfer in a vented square cavity separated by a porous layer filled with different nanofluids (Fe3O4, Cu, Ag and Al2O3) has been investigated numerically. The governing equations of mixed convection flow for a Newtonian nanofluid are assumed to be two-dimensional, steady and laminar. These equations are solved numerically by using the finite volume technique. The effects of significant parameters such as the Reynolds number (10 ≤ Re ≤ 1000), Grashof number (103 ≤ Gr ≤ 106), nanoparticle volume fraction (0.1 ≤ ϕ ≤ 0.6), porous layer thickness (0 ≤ γ ≤ 1) and porous layer position (0.1 ≤ δ ≤ 0.9) are studied. Numerical simulation details are visualized in terms of streamline, isotherm contours, and average Nusselt number along the heated source. It has been shown that variations in Reynolds and Darcy numbers have an impact on the flow pattern and heat transfer within a cavity. For higher Reynolds (Re >100), Grashof (Gr > 105) numbers and nanoparticles volume fractions the heat transfer rate is enhanced and it is optimal at lower values of Darcy number (Da = 10-5). In addition, it is noticed that the porous layer thickness and location have a significant effect on the control of the heat transfer rate inside the cavity. Furthermore, it is worth noticing that Ag nanoparticles presented the largest heated transfer rate compared to other nanoparticles.
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Autorzy i Afiliacje

Hamdi Messaoud
1
Sahi Adel
1
Ourrad Ouerdia
2
  1. Université de Bejaia, Laboratoire de Physique Théorique, Faculté de Technologie, Algeria
  2. Université de Bejaia, Laboratoire de Physique Théorique, Faculté des Sciences Exactes, Algeria

The influence of internal vane on uniform velocity distribution in the cross-flow fan

Jolanta Stacharska-Targosz Monika Chmielowiec
Archive of Mechanical Engineering | 2009 | vol. 56 | No 1 | 61-72 | DOI: 10.24425/ame.2009.132088
Słowa kluczowe cross flow fan the finite volume methods uniform velocity distribution
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Abstrakt

In this paper the authors present the test carried out to obtain the uniform velocity distribution at the outlet cross section of flow fan. In the investigations the inner flat vane mounted inside of the impeller has been applied. For various angular position of the inner vane, one obtained different flow structures as well as different velocity distributions. The analysis of the obtained results is presented in form of graphs shown in 10 figures, juxtaposing flow phenomena with velocity distributions. Numerical flow simulation with the use of Flo++ program based on the Finite Volume Method was carried out.

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Autorzy i Afiliacje

Jolanta Stacharska-Targosz
Monika Chmielowiec

Steady-state and transient heat transfer through fins of complex geometry

Dawid Taler Jan Taler
Archives of Thermodynamics | 2014 | No 2 June | 117-133 | DOI: 10.2478/aoter-2014-0017
Słowa kluczowe fin of complex geometry fin efficiency finite volume method finite element method
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Abstrakt

Various methods for steady-state and transient analysis of temperature distribution and efficiency of continuous-plate fins are presented. For a constant heat transfer coefficient over the fin surface, the plate fin can be divided into imaginary rectangular or hexangular fins. At first approximate methods for determining the steady-state fin efficiency like the method of equivalent circular fin and the sector method are discussed. When the fin geometry is complex, thus transient temperature distribution and fin efficiency can be determined using numerical methods. A numerical method for transient analysis of fins with complex geometry is developed. Transient temperature distributions in continuous fins attached to oval tubes is computed using the finite volume - finite element methods. The developed method can be used in the transient analysis of compact heat exchangers to calculate correctly the heat flow rate transferred from the finned tubes to the fluid.

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Autorzy i Afiliacje

Dawid Taler
Jan Taler

Thermomechanical CSM analysis of a superheater tube in transient state

Paweł Madejski Dawid Taler
Archives of Thermodynamics | 2011 | No 3 December | 117-126 | DOI: 10.2478/v10173-011-0017-1
Słowa kluczowe transient state CFB boiler superheaters Omega tube Finite volume method Computational solid mechanics
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Abstrakt

The paper presents a thermomechanical computational solid mechanics analysis (CSM) of a pipe "double omega", used in the steam superheaters in circulating fluidized bed (CFB) boilers. The complex cross-section shape of the "double omega" tubes requires more precise analysis in order to prevent from failure as a result of the excessive temperature and thermal stresses. The results have been obtained using the finite volume method for transient state of superheater. The calculation was carried out for the section of pipe made of low-alloy steel.
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Autorzy i Afiliacje

Paweł Madejski
Dawid Taler

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