Determination of the in Situ Mine Surface Heat Transfer Coefficient
The surface heat transfer coefficient is measure of the rate of heat transfer from exposed rock surfaces to the ventilating air. Knowledge of its value is of particular importance to accurately simulate the early stages of rock cooling after the opening of an excavation. A number of theoretical formulae for the calculation of the coefficient are available for use in mine climate simulation. However, direct determination by in situ measurement is preferred. Instrumentation, which has been developed for in situ mine measurement, and experimental procedures involving measurement at varying air velocities, are described. In a major study covering four Australian underground mines, the system has been used to determine surface heat transfer coefficients. A direct relationship was clearly established between the measured surface heat transfer coefficient and air velocity. Comparison is made between experimental results and those previously measured or calculated by others. The relationship established can be described by an equation and holds for air velocities above 0.4 m/s. The derived relationship was confirmed at all mines tested and is independent of geology and tunnel dimensions found in modern mines.
S. Gillies et al., "Determination of the in Situ Mine Surface Heat Transfer Coefficient," 5th US Mine Ventilation Symposium., Society for Mining, Metallurgy & Exploration Inc. (SME), Jun 1991.
Mining and Nuclear Engineering
Australian Mineral Industry Research Association
Keywords and Phrases
Exposed Rock Surfaces; Rate of Heat Transfer; Surface Heat Transfer; Ventilating Air
Article - Conference proceedings
© 1991 Society for Mining, Metallurgy & Exploration Inc. (SME), All rights reserved.