|Table of Contents|

Field test on relative thermal efficiencies and thermal stresses of energy utility tunnel under series and parallel operation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
183-190
Research Field:
岩土工程
Publishing date:

Info

Title:
Field test on relative thermal efficiencies and thermal stresses of energy utility tunnel under series and parallel operation
Author(s):
WEI Yeqing1;  KONG Gangqiang1;  ZHANG Jibing1;  YU Da1;  YANG Qing2
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)
Keywords:
utility tunnel;  energy tunnel;  relative thermal efficiency;  thermal stress;  field test
PACS:
TU443
DOI:
10.19815/j.jace.2021.09120
Abstract:
Based on Nanjing software valley utility tunnel project, heat transfer pipes were buried in the bottom, side and top plates to form an energy tunnel, and the heat exchange law of cut-and-cover energy tunnel was studied by heating circulating fluid with constant power. The variation law of inlet/outlet water temperature, the temperature and thermal stress were measured. The relative thermal efficiencies and thermal stress under different connection forms as well as the impact on the surrounding sections during energy tunnel section operation were briefly discussed. The results show that the relative liner thermal efficiencies in parallel and series operation are 39.68 and 31.27 kW?m-1, respectively. The relative liner thermal efficiency in parallel operation is 26.9% higher than that in series, which means parallel operation has better heat transfer performance. The maximum thermal tensile stresses of bottom plate are 1.30 and 1.24 MPa, respectively, and the difference is less than 10%. Due to superposition effect, the maximum compressive stress of adjacent tunnel section is 0.33 MPa, which has little effect on the safety of utility tunnel structure. The relative results can provide a reference for the design and calculation of energy tunnels relying on urban utility tunnel.

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Last Update: 2023-03-20