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    Wyświetlanie 1-4 z 4
    Tytuł:
    CFD simulation of the brattice barrier method for approaching underground mine fires
    Autorzy:
    Adjiski, V.
    Mirakovski, D.
    Despodov, Z.
    Mijalkovski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/972327.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    underground mines
    fire scenario
    modeling fires
    brattice barrier
    approaching fires
    Opis:
    Fires are the most feared hazard in underground mines. The problems associated with under-ground mine fires calls for special techniques and treatments in its prevention and fire fighting. Each mine fire presents unique conditions from the perspective of dealing with it. The purpose of this paper is to present Computational Fluid Dynamics (CFD) simulated fire scenarios on which is tested the brattice barrier method for approaching underground mine fires. With this experimental CFD model we can de-termine the effectiveness of this method. These simulations were performed to determine if we increase the air velocity into the roof with help of brattice barrier, will this remove the smoke and heat upstream of the fire so that firefighters can approach safely and extinguish the fire. We can also observe the explosive range of the particles and gases that travel upstream of the fire and are then forced back into the fire area by this brattice barrier method.
    Źródło:
    Mining Science; 2016, 23; 161-172
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for determining the Air Change Effectiveness of the auxiliary forcing ventilation system in underground mines using CFD software
    Autorzy:
    Adjiski, V.
    Mirakovski, D.
    Despodov, Z.
    Mijalkovski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/89110.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    underground mines
    auxiliary ventilation
    development heading
    air change effectiveness
    mean age of air
    Opis:
    Auxiliary forcing ventilation system is the most common air distribution system of the development headings in underground mines. This paper reports the development of numerical analysis for calculating the Air Change Effectiveness (ACE) of ventilation performance for auxiliary forcing ventilation system in underground mines. The methodology presented in this paper will be demonstrated through Computational Fluid Dynamics (CFD) modelling and calculated in accordance with ASHRAE F25-1997 methodology. Local age, Mean Age of Air (MAA) and ACE were calculated in three scenarios using CFD modelling to study the ventilation performance. ACE was calculated at locations in the development headings occupied space, based on the MAA from the same ventilation system parameters in three different scenarios. Simulation results indicate that ACE is influenced due to the involvement of objects in the development heading that can reduce the effective volume of the zone. This study provides some new ideas for measuring ACE which can provide better auxiliary ventilation system in underground mines. The proposed methodology could be applied as guidance for design and setup of auxiliary ventilation systems. Results from this CFD modelling will be used for extensive validation study which purpose will be to prove the accuracy of the methodology and, if necessary, to improve it.
    Źródło:
    Mining Science; 2018, 25; 161-178
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and optimization of evacuation routes in case of fire in underground mines
    Autorzy:
    Adjiski, V.
    Mirakovski, D.
    Despodov, Z.
    Mijalkovski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/91938.pdf
    Data publikacji:
    2015
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    underground mine
    fire scenario
    modeling fires
    optimization
    simulation
    evacuation plan
    kopalnia podziemna
    scenariusz pożaru
    modelowanie pożaru
    optymalizacja
    symulacja
    plan ewakuacji
    Opis:
    Risks of fire occurrence in underground mines are known for a long time. Evacuation and rescue plans allow to each underground mine to respond and establish control in case of emergency. The primary goal of this paper is to determine the optimal system for evacuation in case of fire in underground mines and through a process of computer simulation to be presented to all workers that are affected by this issue. In this study is developed a system that allows by using available software to work out the complete evacuation plans that include analysis of fire scenarios and optimal routes for evacuation. With development of database of fire scenarios, it is possible to plan routes for evacuation in all situations. This presented methodology can serve to make effective system for evacuation and rescue in case of fire and to help save lives and protect the financial investment in the mine. This methodology represents the most economical option of making an effective system for evacuation and also can serve as an idea of making a software package that includes all the steps of making a system for evacuation and rescue in case of fire in underground mines. This presented model will have increased accuracy compared to other models presented so far, because of the prepared 3D model of the underground mine which includes the actual dimensions of the mine along with its associated elements from which the fire dynamics and system for evacuation depends.
    Źródło:
    Journal of Sustainable Mining; 2015, 14, 3; 133-143
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise Exposure of School Teachers – Exposure Levels and Health Effects
    Autorzy:
    Hadzi-Nikolova, M.
    Mirakovski, D.
    Zdravkovska, M.
    Angelovska, B.
    Doneva, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/176362.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    teachers
    school
    noise
    exposure
    health effects
    Opis:
    Faculty of Natural and Technical Sciences and Faculty of Medical Sciences starting from December 2012, launched joint study in order to investigate personal noise exposure and associated health effects in general school teachers population, starting from kindergartens up to high schools in Stip, Macedonia. In order to determine workplace associated noise exposure and associated health effects in this specific profession, a full shift noise exposure of 40 teachers from 1 kindergarten, 2 primary and 2 high schools were measured in real conditions using noise dosimeters. A-weighted equivalent-continuous sound pressure levels (L) of each teacher were recorded during single activities (classes). Normalized 8-hours exposure, termed the noise exposure level (Lex;8 h) was also computed. Daily noise dose is another descriptor for noise exposure that was determined as a measure of the total sound energy to which workers have been exposed, as a result of working in the varying noise levels. Health effects were assessed trough a full scale epidemiological study which included 231 teachers from the same schools. Specific questionnaire was used to extract information about subject’s perception on occupational noise exposure, as well as theirs occupational and medical history.
    Źródło:
    Archives of Acoustics; 2013, 38, 2; 259-264
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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