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Appl. Sci. 2017, 7(7), 679; doi:10.3390/app7070679

Numerical Investigation of Heat-Insulating Layers in a Cold Region Tunnel, Taking into Account Airflow and Heat Transfer

1
MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Department of Civil Engineering, Southwest Jiaotong University, Emei 614202, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yulong Ding
Received: 30 March 2017 / Revised: 29 May 2017 / Accepted: 15 June 2017 / Published: 1 July 2017
(This article belongs to the Special Issue Advances in Thermal System Analysis and Optimization)
View Full-Text   |   Download PDF [6830 KB, uploaded 1 July 2017]   |  

Abstract

In cold regions, heat-insulating layers play a crucial role in frost prevention in tunnels. This paper presents a numerical study on the anti-freezing behavior of a cold region tunnel (the Dege tunnel) with heat-insulating layers. A numerical model based on the temperature field coupling theory is firstly proposed and validated using field test data of the Dege tunnel. Subsequently, a comprehensive parametric study is carried out to investigate the influences of heat-insulating layers on the temperature characteristics of airflows inside the tunnel, the surrounding rock, and the tunnel lining. Furthermore, a numerical investigation based on the proposed numerical model is carried out to propose reasonable design parameters of heat-insulating layers for different velocities of mechanical ventilation, and different heat-insulating materials for cold region tunnels. The numerical results show that using the heat-insulating layer can effectively reduce the heat transfer between the surrounding rock and the airflow inside the tunnel. It is also found that the design parameters for the heat-insulating layer are greatly affected by the tunnel ventilation conditions and heat-insulating materials. View Full-Text
Keywords: cold region tunnel; anti-freezing behavior; heat-insulating layer; tunnel ventilation; temperature field cold region tunnel; anti-freezing behavior; heat-insulating layer; tunnel ventilation; temperature field
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MDPI and ACS Style

Yan, Q.; Li, B.; Zhang, Y.; Yan, J.; Zhang, C. Numerical Investigation of Heat-Insulating Layers in a Cold Region Tunnel, Taking into Account Airflow and Heat Transfer. Appl. Sci. 2017, 7, 679.

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