Experimental investigation on Influencing Factors of air curtain systems barrier efficiency for mine refuge chamber

Zhang, Zujing; Yuan, Yanping; Wang, Kequan; Gao, Xiangkui; Cao, Xiaoling

doi:10.1016/j.psep.2016.05.008

Cited by 39 publications

(18 citation statements)

References 16 publications

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“…Their barrier efficiency is affected by their structural parameters, installation location and airflow angle as well as size of chamber door. Zhang et al [32] pointed out that air curtain systems, with air curtains installed on two sides of the door frame behind the door wall that ejected air parallel to the door frame, provide a relatively good barrier effect. An air curtain system that uses pipeline air curtains with a nozzle diameter of 1 mm and a nozzle distance of 15 mm demonstrates a relatively good barrier effect and a barrier efficiency of 55 % to 60 %.…”

Section: Air Quality Control and Ventilationmentioning

confidence: 99%

Ventilation and environmental control of underground spaces: a short review

Kosonen

Melikov

et al. 2019

E3S Web Conf.

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More and more underground spaces were used in 21st century because of rapid urbanization, traffic problems, etc. Underground city, metro, tunnel, mine, industrial and agriculture engineering, civil air defence engineering need large underground spaces. Underground spaces with different thermal, ventilation and lighting environments may cause comfort, health and safety problems. Concrete problems include excessive humidity, heat transfer specialty, excessive CO caused by blockage in long distance traffic tunnels, difficulty in smoke exhaust and evacuation during fire, harmful microorganism, radioactivity pollutants, psychological problems, and so forth. Air quality control technologies for underground spaces, including ventilation technology, dehumidification technology, natural energy utilization technology, smoke extraction technology and ventilation resistance reduction technology, will be reviewed. Ventilation for smoke-proof/evacuation and ventilation will also be reviewed.

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Section: Air Quality Control and Ventilationmentioning

confidence: 99%

Ventilation and environmental control of underground spaces: a short review

Kosonen

Melikov

et al. 2019

E3S Web Conf.

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“…[9] MRCs in an underground mine are constructed by excavating caverns from the strata on the sides of the escape route or equipping the cross headings in the mine with necessary refuge facilities and equipment. [10] While MMRC is a steel-structure cabin which can be moved along with the underground mine working face. In China, MRC is the main refuge place in coal mine.…”

Section: Introductionmentioning

confidence: 99%

“…However, high temperature and high concentration harmful gas issue accompanied with the accident becomes a problem in MRC due to human metabolism and harmful elements. [10,11] As one of the basic conditions for safe survival, it is crucial to control the air temperature in the MRC. It should be noted that cooling a MRC is challenging since the electrical power supply is often interrupted during and after an accident as well as the risk of re-explosion still exists.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a mine refuge chamber with human body heat sources under ventilation

Zhang

Wang

et al. 2019

Applied Thermal Engineering

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This paper investigated the dynamic coupling heat transfer characteristics of rock and air in a Mine Refuge Chamber (MRC) under ventilation. In the current work, a comprehensive fiftyperson MRC model combining human-body heat sources and ventilation is established, the proposed model is validated against available experimental data with deviation less than 4%. Furthermore, sensitivity analysis is performed to investigate the influence of several control parameters such as heating rate, ventilation and wall area in a MRC through using numerical simulation. Results indicated that: (ⅰ) the heat transfer process in a MRC will reach a stage of air temperature slow increase (ATSI) in less than 0.5 h. The air temperature rises linearly with the square root of time during the ATSI stage; (ⅱ) for a MRC built in a sandstone seam with an initial rock temperature of less than 27 °C, the average air temperature will not exceed 35 °C in 96 h when the ventilation volume rate is 0.3 m 3 /min per person; (ⅲ) the rate of temperature rise in MRC is proportional to the rate of heat generation, but it is inversely proportional to the thermal conductivity, density and thermal capacity of the rock, as well as the ventilation volume rate and the wall area; (ⅳ) an empirical correlation for the MRC average air temperature is developed while the supply air temperature equals to the initial rock temperature. Keywords：Underground; Mine refuge chamber; Air temperature prediction; Ventilation; Heat transfer coefficient; Human body heat sources. Nomenclature a Constant in K expression V Ventilation volume for MRC, m 3 /h A w Wall area of MRC, m 2 x, y Coordinate direction vector b Constant in K expression Subscripts B Temperature variable, °C a Air c Constant in K expression num Numerical data C a Specific heat capacity of air, J/(kg• K) exp Experimental data C p Specific heat capacity of rock, J/(kg• K) Greek symbols d Constant in K expression α Surface heat transfer coefficient, W/(m 2 • K) i, j Constant in B expression Θ Difference k Constant in B expression ρ Density of rock, kg/m 3 K Rate for air temperature increasing, °C/s 0.5 ρ a Density of air, kg/m 3 l Constant in B expression λ Thermal conductivity of rock, W/(m• K) L Temperature variable, °C τ Heat time, h L c Perimeter of cross-section tunnel, m Acronyms m, n Constant in K expression ATSI Air temperature slow increase p Pressure, Pa CE Critical equilibrium Q Total heat generation rate in MRC, W MRC Mine refuge chamber r 0 equivalent radius of cross-section tunnel, m MMRC Movable mine rescue capsules T Temperature, °C PCM Phase change materials T 0 Initial rock temperature, °C

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“…As shown in Fig.1, the underground mine refuge chamber is the most important emergency rescue shelter [1] , which provides sufficient time for the trapped miners to wait for the rescue. Such refuge chambers are sealed ones that are made of steel, which can prevent high temperature, harmful gas and shock from outside.…”

Section: Introductionmentioning

confidence: 99%

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Method and model development

Yuan

Gao

et al. 2017

Energy

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In some special circumstances such as building envelope, Traditional cooling methods can not meet the requirements of safety, stability, reliability and energy saving. In Part I of this study, a new conjugate cooling method of Phase Change Material (PCM) combined with Pre-cooling of Building Envelope (PBE) is proposed and the numerical model of PBE are developed. In the current study, a refuge chamber is selected as a case study. A semi-analytical method is used to analyze the cold storage performance of the surrounding rock (SR). Afterwards, a numerical simulation model of the coupling cooling system, which take the heat source, SR, PCM and air heat transfer into consideration, is further established. The study identified that the simplified semi-analytical calculation formula with the diagram of the cold storage quantity of SR are very helpful for engineering calculation. The influence of the Fourier and Biot number on the cold storage capacity of SR can be easily analyzed. In addition, the whole-field model of the conjugate cooling system is completely developed based on the PCM unit. Part II will involve a parametric assessment and the optimization of the conjugate colling method will be explored.

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Experimental investigation on Influencing Factors of air curtain systems barrier efficiency for mine refuge chamber

Cited by 39 publications

References 16 publications

Ventilation and environmental control of underground spaces: a short review

Ventilation and environmental control of underground spaces: a short review

Thermal performance of a mine refuge chamber with human body heat sources under ventilation

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Method and model development

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