Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy
A comprehensive understanding of airflow temperature distribution within high-temperature tunnels is crucial for developing effective cooling strategies that ensure a safe environment and acceptable construction costs. In this paper, we introduce a novel cooling strategy that integrates thermal insu...
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| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Fire |
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| Online Access: | https://www.mdpi.com/2571-6255/8/1/16 |
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| author | Fangchao Kang Jinlong Men Binbin Qin Guoxi Sun Ruzhen Chen Weikang Zhang Jiamei Chen Zhenpeng Ye |
| author_facet | Fangchao Kang Jinlong Men Binbin Qin Guoxi Sun Ruzhen Chen Weikang Zhang Jiamei Chen Zhenpeng Ye |
| author_sort | Fangchao Kang |
| collection | DOAJ |
| description | A comprehensive understanding of airflow temperature distribution within high-temperature tunnels is crucial for developing effective cooling strategies that ensure a safe environment and acceptable construction costs. In this paper, we introduce a novel cooling strategy that integrates thermal insulation layers and heat exchangers aligned along the tunnel axis (TIL-HE strategy). We investigate variations in airflow temperature and valid ventilation distance (VVD) and compare them with two other cooling strategies: natural tunnels only employing mechanical ventilation (NT strategy) and tunnels featuring thermal insulation layers (TIL strategy), through the 3D k-ε turbulence model in COMSOL Multiphysics. Our findings indicate that (1) the TIL-HE strategy demonstrates superior cooling performance, resulting in significantly lower airflow temperatures and markedly higher VVD; (2) higher water velocity and more heat exchangers contribute to lower airflow temperature and prolonged VVD; (3) positioning the heat exchangers within the surrounding rock rather than inside the insulation layer leads to even lower airflow temperature and longer VVD. Longitudinal-arranged heat exchangers present fewer construction challenges compared to traditional radial-drilled ones, ultimately reducing tunnel construction costs. These findings provide valuable insights for optimizing cooling strategies and engineering parameters in high-temperature tunnel environments. |
| format | Article |
| id | doaj-art-3f52fdfea532403ab7450b1559e2415a |
| institution | Kabale University |
| issn | 2571-6255 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fire |
| spelling | doaj-art-3f52fdfea532403ab7450b1559e2415a2025-01-24T13:32:17ZengMDPI AGFire2571-62552025-01-01811610.3390/fire8010016Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal EnergyFangchao Kang0Jinlong Men1Binbin Qin2Guoxi Sun3Ruzhen Chen4Weikang Zhang5Jiamei Chen6Zhenpeng Ye7School of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaGuangdong Provincial Key Lab of Petrochemical Equipment Fault Diagnosis, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaSchool of Energy and Power Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaA comprehensive understanding of airflow temperature distribution within high-temperature tunnels is crucial for developing effective cooling strategies that ensure a safe environment and acceptable construction costs. In this paper, we introduce a novel cooling strategy that integrates thermal insulation layers and heat exchangers aligned along the tunnel axis (TIL-HE strategy). We investigate variations in airflow temperature and valid ventilation distance (VVD) and compare them with two other cooling strategies: natural tunnels only employing mechanical ventilation (NT strategy) and tunnels featuring thermal insulation layers (TIL strategy), through the 3D k-ε turbulence model in COMSOL Multiphysics. Our findings indicate that (1) the TIL-HE strategy demonstrates superior cooling performance, resulting in significantly lower airflow temperatures and markedly higher VVD; (2) higher water velocity and more heat exchangers contribute to lower airflow temperature and prolonged VVD; (3) positioning the heat exchangers within the surrounding rock rather than inside the insulation layer leads to even lower airflow temperature and longer VVD. Longitudinal-arranged heat exchangers present fewer construction challenges compared to traditional radial-drilled ones, ultimately reducing tunnel construction costs. These findings provide valuable insights for optimizing cooling strategies and engineering parameters in high-temperature tunnel environments.https://www.mdpi.com/2571-6255/8/1/16thermal hazardshigh-temperature tunnelinsulation layerheat exchangervalid ventilation distance |
| spellingShingle | Fangchao Kang Jinlong Men Binbin Qin Guoxi Sun Ruzhen Chen Weikang Zhang Jiamei Chen Zhenpeng Ye Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy Fire thermal hazards high-temperature tunnel insulation layer heat exchanger valid ventilation distance |
| title | Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy |
| title_full | Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy |
| title_fullStr | Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy |
| title_full_unstemmed | Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy |
| title_short | Comparative Study on the Evolution of Airflow Temperature and Valid Ventilation Distance Under Different Cooling Strategies in High-Temperature Tunnels for Mining Thermal Energy |
| title_sort | comparative study on the evolution of airflow temperature and valid ventilation distance under different cooling strategies in high temperature tunnels for mining thermal energy |
| topic | thermal hazards high-temperature tunnel insulation layer heat exchanger valid ventilation distance |
| url | https://www.mdpi.com/2571-6255/8/1/16 |
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