Building Simulation

, Volume 11, Issue 4, pp 765–771 | Cite as

Gas flow behavior and flow transition in elevator shafts considering elevator motion during a building fire

  • Yanqiu Chen
  • Lizhong Yang
  • Zhijian Fu
  • Longfei Chen
  • Junmin Chen
Research Article Indoor/Outdoor Airflow and Air Quality
  • 31 Downloads

Abstract

This paper explored the transition of flow in an elevator shaft and analyzed how the gas flow is affected by the moving elevator car during a building fire. A 3D model was built through ANSYS Fluent, the elevator motion was resolved through dynamic mesh theory. Flow fields in the elevator shaft were compared to describe the flow transition. Pressure distributions were applied to explain how the transition was accomplished and how the gas flow was influenced by the moving elevator car. Chemical reaction in the room released large amounts of CO2 and CO. The change in CO2 and CO concentration in the shaft was applied to measure the influence of elevator motion on the flow. At the start of the simulation, the gas moved slowly and smoothly upwards in the area between the elevator car and the top. As the elevator car moved, this area shrank steadily and significantly. In the end, this area disappeared and the transition of flow status in the entire shaft had been accomplished. The elevator motion decreased the pressure inside the shaft as well as the lobby. While the elevator car moved upwards with 1.75 m/s, the pressure in the lobby was decreased by 142.9% while the CO2 and CO concentration was increased compared to the case with still elevator cars, which indicated that more fire smoke flew into the lobby when the elevator car moved in the shaft.

Keywords

elevator shaft piston effect building fire fire smoke elevator motion 

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Notes

Acknowledgements

This work is supported by the Fundamental Research Funds for the Central Universities (No. 2682017CX079), the National Natural Science Foundation of China (No. 71573215), and the Opening Fund of State Key Laboratory of Fire Science (No. HZ2017-KF11).

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yanqiu Chen
    • 1
    • 2
  • Lizhong Yang
    • 3
  • Zhijian Fu
    • 4
    • 5
  • Longfei Chen
    • 1
    • 2
  • Junmin Chen
    • 1
    • 2
  1. 1.Department of Fire Protection EngineeringSouthwest Jiaotong UniversityChengdu, SichuanChina
  2. 2.State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail SafetyChengdu, SichuanChina
  3. 3.State Key Laboratory of Fire ScienceUniversity of Science and Technology of ChinaHefei, AnhuiChina
  4. 4.School of Transportation and LogisticsSouthwest Jiaotong UniversityChengdu, SichuanChina
  5. 5.National United Engineering Laboratory of Integrated and Intelligent TransportationSouthwest Jiaotong UniversityChengdu, SichuanChina

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