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Improvement of calculation method for heat transfer coefficient in air shaft based on experimental measurements in reversal ventilation mode

The article describes an improved calculation method for the effective heat transfer between a wet air shaft and air flow based on experimental measurements in the mode of reversal ventilation using the numerical solution of an equation system of joint heat and mass exchange between air flow and the shaft walls with regard to moisture transfer. The direct model analysis of varying moisture content of air flow allowed more accurate estimation of the air temperature change in the shaft because of the mass exchange processes. The effective heat transfer coefficient included in the mathematical model of joint heat and mass transfer in the air, shaft lining and rock mass was determined by minimization of disagreement between the measured and calculated temperatures in air flow in the shaft and in adjoining roadways, as well as between the measured and calculated temperatures of the shaft lining at the junctions of the shaft and roadways. It is found that the value of the heat transfer coefficient in the test air shaft is nonuniform along the shaft height due to different moisture contents of the shaft areas. For three test shaft areas, the formulas are obtained to evaluate the effective heat transfer coefficients. The obtained values were much higher than the calculations using classical formulas for dry roadways. The effective temperature conductivity was also determined for three test areas of the shaft lining.

Keywords: mine ventilation, air shaft, joint heat and mass transfer, moisture transfer, effective heat transfer coefficient, effective temperature conductivity of lining, reversal ventilation.
For citation:

Kolesov E. V., Semin M. A., Kazakov B. P., Knjazev N. A. Improvement of calculation method for heat transfer coefficient in air shaft based on experimental measurements in reversal ventilation mode. MIAB. Mining Inf. Anal. Bull. 2023;(3):57-71. [In Russ]. DOI: 10.25018/0236_1493_2023_3_0_57.

Acknowledgements:

The study was supported by the Russian Foundation for Basic Research, Project No. 19-35-90076, and by the Ministry of Science and Higher Education of the Russian Federation, State Contract No. 075-03-2021-374 dated 29 December 2020, RN 122012000396-6.

Issue number: 3
Year: 2023
Page number: 57-71
ISBN: 0236-1493
UDK: 622.4
DOI: 10.25018/0236_1493_2023_3_0_57
Article receipt date: 14.12.2022
Date of review receipt: 23.01.2023
Date of the editorial board′s decision on the article′s publishing: 10.02.2023
About authors:

E.V. Kolesov1, Engineer, e-mail: kolesovev@gmail.com, ORCID ID: 0000-0002-0755-7405,
M.A. Semin1, Dr. Sci. (Eng.), Academic Secretary, Head of Laboratory, ORCID ID: 0000-0001-5200-7931,
B.P. Kazakov1, Dr. Sci. (Eng.), Professor, Chief Researcher,
N.A. Knjazev1, Junior Researcher,
1 Mining Institute of Ural Branch of Russian Academy of Sciences, Perm, 614007, Russia.

 

For contacts:

E.V. Kolesov, e-mail: kolesovev@gmail.com.

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