Simulation study on cooling potential of multi-tube earth-air tunnels

Based on a 3-D unsteady heat conducting mode and a 1-D liquid heat transfer mode, establishes heat transfer mode of multi-tube earth-air tunnel by using finite difference method. Verifies the correctness of this mode by comparison between simulated data and test data. Develops a simplified method with a modified temperature. Analyses the influences of tube number, depth of buried tube and tube spacing on cooling potential of multi-tube earth-air tunnels.