An Approach to Mine Ventilation Based on Aerodynamic Potential of Ventilating Air with Reference to Unit Mass of Dry Air

Elevations, corrected barometric pressures, dry and wet-bulb temperatures are measured during a ventilation survey of a mine ventilation system. The following parameters at measuring stations are calculated: partial vapour pressures, moisture contents, apparent specific volumes (in polytropic and isentropic flows) and aerodynamic potentials of ventilating air referred to unit mass of dry air. For different branches of the system, the following parameters are determined: polytropic exponent, aerodynamic potential drop, technical works in polytropic and isentropic flows, liquid water droplets mass, local natural ventilating energy, usable energy of fan station, energies lost to remove water vapour and liquid water droplets and frictional dissipation of mechanical energy. Canonical and potential diagrams of the system are presented. Local and main natural ventilating energies are shown. Characteristics of main natural ventilating energy, the resultant characteristics of the network and the point of equilibrium of the system are presented. For four meshes of the system, the energy balances are estimated along with balances of usable power for the system with or without introduction of compressed air. Supplementary questions and conclusions are given.