Analytical system for ventilation simulators with skyline nodal pressure method and practical estimate system for underground mine air-conditioning

A ventilation analytical system adapting nodal pressure method using skyline modified Choleski's decom-position scheme for network-flow analysis and a new practical system to estimate various thermal air conditions has been developed. The quasi-linear equations for solving steady-state network airflow have been described using the connective function in general forms. The skyline modified decomposition scheme has an advantage on rapid convergence and the sake of computer memory space compared with other schemes. The key part of the analysis for climatic conditions through network airways is how to estimate the temperature of the airway rock-surface with partly or full wet condition. A practical and simple solution without any iterative calculations for its estimation has been proposed. This new solution is applicable to practical ranges of airflow temperature, humidity, rock thermal properties and wetness. The present analytical system have been successfully applied to a ventilation simulator named “MIVENA” developed by authors.