Abstract
The authors have already proposed a practical node potential method for ventilation network analysis, which is today used in all major coal mines in Japan. However, in the course of experience with this method it was found that two major problems must be solved for the calculation to be sped up: converge retardation by inadequate selection of an initial value of pressure to be given to the nodes and by extraordinarily small resistances of airway.The present paper describes the improved method by which the calculation time is reduced to about one second to one fourth of that by the previously proposed method, the new techniques being introduced to solve the above problems. Also, the effect of natural ventilation pressure on the forced ventilation system and a problem of ventilation control in emergency are discussed, using the newly proposed method.
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