Performance of earth-air tunnel system for different earth surface treatments

Incorporating the effect of diurnal variations and annual variations of the environmental parameters (in a way similar to the analysis of amplitude modulation), the performance of an earth-air tunnel of infinite dimension along the horizontal direction has been analysed; dimensionless parameters have been used. The effect of earth storage on the performance of the tunnel has also been taken into account. The effect of modifying the earth's surface conditions, by wetting and shading, on the performance of earth-air tunnel system has also been investigated under two conditions: first when the inlet air is drawn from the ambient, and secondly when it is drawn from a conditioned room for recirculation to the room.