The Effect of Temperature of Rocks on Microclimatic Conditions in Long Gate Roads and Galleries in Coal Mines

Cygankiewicz, J.; Knechtel, J.

doi:10.2478/amsc-2014-0014

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…The use of average values for short-ventilated sections can generate underestimation, but in the case of long-ventilated ones, it could result in revaluation. In predicting climatic conditions, the relationships determining heat fluxes from low-temperature oxidation of coal may be helpful [24,25].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Archives of Mining Sciences

2022

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The ImporTance of The Wf coeffIcIenT In forecasTIng clImaTIc condITIonsIn coal excavaTIonsThe article presents the results of research on the formation of the WF coefficient in coal excavations. The WF coefficient determines the share of the wet surface of the excavation sidewall. The wet part of the excavation sidewall is covered partly by the water film, which evaporates, lowering the temperature of this surface. This coefficient is one of the principal parameters used in forecasting the changes in temperature and humidity of the mine air occurring on the way of contact between the excavation sidewall and the flowing air. During the determination of the coefficient value, the criterion of equality of the actual and forecasted ratios of sensible heat to total heat was assumed in the research methodology. Values of the WF coefficient in the examined excavations generally vary within the range of 0,1-0,6, and they are mostly dependent on the parameters related to the period of ventilation.

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Section: Discussion Of the Resultsmentioning

confidence: 99%

Archives of Mining Sciences

2022

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“…Danko and Bahrami 3 used software (Multiflux and CLIMSIM) to simulate the heat and moisture transfer between roadway surrounding rock and airflow. Cygankiewicz and Knechtel 4 used the computer simulation method to study the influence of surrounding rock on airflow temperature and enthalpy and the influence of original rock temperature and rock mass temperature on heat dissipation of surrounding rock. Gao and Zhang 5 proposed a quadratic curve fitting formula for the relationship between saturated air moisture content and temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on calculation model of airflow temperature and humidity prediction in humid airway

Wang

Zhang

Zheng

et al. 2023

Energy Science & Engineering

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In deep coal mining, the high temperature and humidity environment are one of the main disasters threatening workers and equipment. To predict the temperature and humidity of airflow in the airway accurately, this study establishes a numerical calculation model of the surrounding rock temperature, airflow temperature, and humidity under the conditions of considering the moisture evaporation and heat absorption of the airway wall, the condensation and heat release of supersaturated water vapor in the airflow, and the influence of air compression or expansion. Combined with the two-dimensional (2D) heat conduction model (considering the influence of the axial surrounding rock heat conduction of the airway), the axial strip partial moisture calculation model of the airway is proposed, and then the uniform moist wall model and the axial strip partial moist wall model are established. The influence of different parameters on the temperature and humidity of airflow is discussed by analyzing the results of numerical simulation of the uniform wet surface model (UWSM) and partly wet surface model (PWSM) of the airway wall. The results show that the surrounding rock temperature, especially the temperature distribution of the airway wall, calculated by using the 2D heat conduction model under the local humid airway conditions, is more realistic. The increment of airflow temperature decreases with the increase of wet area ratio, airflow temperature at the entrance and airway radius, and increases with relative humidity at the entrance. The calculation accuracy of temperature and humidity prediction for large ventilation networks can be further improved by using the equivalent humidity of the UWSM to replace the correction coefficient of the wet area ratio of the PWSM.

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“…In recent years, finite element method and finite volume method are also used to simulate the temperature field of roadway surrounding rock [8,9]. With the wide application of numerical calculation methods, the distribution of temperature field [10,11], the analysis of influencing factors [12,13], and the characteristics of heat and moisture exchange [14][15][16] are analyzed. In the site investigation and experimental testing, similar experimental platform for temperature field of roadway surrounding rock was established, and the unsteady state process of temperature field of roadway surrounding rock was analyzed [4,17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Unsteady Temperature in Thermal Insulation Supporting Roadway

Shu-guang

Wang

2019

Mathematical Problems in Engineering

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High geothermal hazard is a basic problem that must be solved in deep mining; thereby the research on thermal insulation supporting for high temperature control of deep roadway is increasing. However, the quantitative analysis of its thermal insulation effect is yet to be carried out. By building the physical model and control equations of the thermal insulation supporting roadway and considering heat-humidity transfer at wall, the temperature field distribution of surrounding rock and airflow is numerically calculated. Based on numerical simulation results, the evolution law of temperature with ventilation time is analyzed at airflow inlet, outlet, and different sections, then the variation law of surface heat transfer coefficient with position and time is obtained. For heat insulation support structure, the results show that it is not obvious to change the distribution law of temperature field, but it is effective to weaken the convection heat transfer between surrounding rock and airflow. In the main airflow area, the rate of heat exchange gradually decreases with the heat exchange becoming more and more sufficient; in boundary layer, the airflow temperature quickly transits from the wall temperature to that of the main airflow area because of intense collisions of airflow masses, so the mechanism of temperature change is different. The surface heat transfer coefficient well reflected the unstable heat-humidity transfer, especially in the beginning of ventilation or at airflow inlet. Therefore, the heat insulation supporting structure is helpful to the auxiliary cooling of high temperature mine.

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The Effect of Temperature of Rocks on Microclimatic Conditions in Long Gate Roads and Galleries in Coal Mines

Cited by 4 publications

References 1 publication

Archives of Mining Sciences

Archives of Mining Sciences

Numerical study on calculation model of airflow temperature and humidity prediction in humid airway

Numerical Simulation Analysis of Unsteady Temperature in Thermal Insulation Supporting Roadway

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