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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

HEAT TRANSFER IN WET ROCKS - ITS DEPENDENCE FROM OVERGROUND ENVIRONMENTAL CLIMATE AND A NEW IN SITU-DETERMINATION OF THERMAL DIFFUSIVITY BY MEASUREMENTS AND SIMULATION

Get access (open in a dialog) DOI: 10.1615/IHTC7.790
pages 115-119

Abstract

In the scope of an extensive project for the reconnaissance of the Transmission-heatlosses at underground-buildings the space- and time-dependend temperature distribution round a store tunnel in rocks was measured.

After a heat up-periode a thermal steady state was reached which depends more than expected from overground environmental conditions.

The theory of Heat conduction gives a solution for temperature profile and energy transport in solids; in this case (cylinder coordinates) a numerical method was applicated. The steady state, characterized by constant rate of Energy-Transfer (heat-transfer) out of the tunnel into the rock, is explained with a model called "anti-source of energy" which has it real background in the heat transfer by so called "vagabond rockwater".

The influence of this rockwater is shown by the connection between the amount of precipitation on the surface of the mountain and the consumption of oil for heating the store tunnels.

With a Computional simulation of the thermal process and a step-by-step improvement and adaption of the basic model a correspondence between calculated and measured values was reached. From this one can obtain the thermal diffusivity "in situ", which depends direct from water content in Rocks.