Abstract
The present paper describes an improved practical method for the calculation of airtemperature and humidity along a roadway under complicated conditions.
Firstly working equations are introduced to evaluate heat flow from the surrounding rocks and sensible heat ratio of a roadway, either partially or totally wet, using the concept of modified air temperature which was proposed in the 2nd report of the present serial studies.
Secondly it is shown that the heterogeneous surrounding medium which cnsists of coal and sand stone or shale can be treated as an apparently homogeneous rock by introducing an equivalent thermal conductivity.
Finally discussions are made on the temperature variation of ventilation air when the air temperature at the reference point changes with time, and working equations are introduced by which air temperature can be calculated accurately enough in both cases that the temperature at the starting point changes suddenly and sinusoidally.
