Computer simulation of the thermal environment inside a 275-kV underground electric cable tunnel

Wan Ki Chow, Chun Chung Chan, J. Ip

Research output: Journal article publicationConference articleAcademic researchpeer-review

1 Citation (Scopus)


The thermal environment inside a proposed 275-kV electric cable tunnel in Hong Kong is discussed in this paper. The tunnel is 5 km long and composed of four sets of circuits buried in cable trenches. Each set of circuits dissipates 103.5 W of thermal power per unit meter length of tunnel. The problem is simulated by considering conduction in the solid materials surrounding the tunnel and convection in the tunnel air. Equations for thermal conduction inside the solid structures are solved numerically first. The induced natural convective air current is then predicted using the field-modeling technique to compute the air velocity and temperature. The predicted results of the tunnel air temperature are used for deciding whether a forced ventilation system is necessary to keep the air temperature below 40 °C. Further, the design of the mechanical ventilation system is illustrated by roughly estimating the required incoming air speed to maintain the tunnel below 40 °C.
Original languageEnglish
Pages (from-to)277-284
Number of pages8
JournalASHRAE Transactions
Issue numberpt 2
Publication statusPublished - 1 Dec 1993
EventProceedings of the 1993 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. - Denver, CO, United States
Duration: 27 Jun 199330 Jun 1993

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes


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