The main and booster natural ventilating energies in the mine ventilation network

Author: H. Bystroń

The verification of the formulae (1.4) and (1.6) describing the main and booster natural ventilating energies has been the aim of the work.

A thermodynamic method for calculation of dry air parameters in measuring cross-sections, branches and external meshes of a network is presented.

Those parameters have been calculated (table 1?5) for simple and complex networks with ascensional and decensional ventilation, respectively (figures 1, 3, 5, 7, 9). The static criterion of stability of operation of a fan-network system (Bystroń, 1998) has been used to verify the formula (1.4).

The conditions (5.5) and (9.5) (Budryk, 1956) of air flow direction preservation in the lateral and main stream of the internal part of a two-mesh network with ascensional and decensional ventilation, respectively, have been used to verify the formula (1.6).

The determined main and booster energies are presented on diagrams and graphs (figures 1, 3, 5, 7, 9) and interpreted by power thermodynamic cycles on the diagrams (figures 2, 4, 6, 8, 10).

The verification of the formulae (1.4) and (1.6) has been positive.

Weighted-average natural energies (1.5) calculated for the above mentioned networks are significantly different from determined main natural energies (table 6).

So, when calculating aerodynamic resistance of a complex network and its resultant characteristic one ought to use the main natural energy.