Author(s)

H. Barrow & C.W. Pope

Abstract

Numerical prediction of irregular cyclic variation of temperature in an underground metro system H. Barrow* & C.W. Pope& "University of Liverpool, P.O. Box 147, Liverpool ^Crossrail Project Office, Telstar House Eastbourne Terrace, London W2 6LW, UK ABSTRACT In this paper, a first Law of Thermodynamics analysis is made to predict the daily variation of the average temperature in a subterranean railway tunnel system operating under irregular cyclic conditions. The results of the finite difference method used to determine the temperature history indicate that the conjugate heat transfer to and from the tunnel wall attenuates the temperature amplitude and causes a lag in the oscillations. INTRODUCTION In general, unsteady periodic heat transfer takes place with the temperature varying either harmonically or irregularly. Examples in these two categories are, respectively, an air conditioning plant with cosinusoidally varying ambient conditions and trains in transit th

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