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Abstract
Saving energy is a major challenge for the development and safety of the world. Researchers at home and abroad have been continuously working on energy saving technology in the tunnel ventilation for decades. Based on segmented longitudinal ventilation for extra-long road tunnels, the main ventilation mode and utilization method of natural wind energy in extra-long road tunnel were analyzed in this paper. In addition, the possible velocity distribution of natural wind in each section under wind pressure was investigated. Principles of natural wind in each tunnel section were studied based on long-term monitored meteorological factors. Accordingly, a fan equipment configuration method with high guaranteed rate during tunnel operation was proposed. A calculation method for energy-saving network ventilation in the tunnels was established. A feasible and efficient optimized energy-saving ventilation strategy was proposed, which utilizes natural wind and reduces the operation energy consumption. Thus, the annual energy saving in ventilation can reach up to 43.2% compared to previous energy costs when the intelligent ventilation system works. The research results can properly combine natural wind energy with mechanical ventilation to realize the smart self-energy saving in extra-long tunnels.
Highlights
Climate separation zone usually means the transition region between two different climate zones
Natural wind, inside the extra-long tunnels located in climatic separation zone, shows more obvious effect on ventilation than in other regions [1,2] and its velocity in the tunnels can be 4–7 m/s [3]
Traditional ventilation design is not suitable for tunnels in climatic separation zone. In these extra-long tunnels, the control strategy combining natural ventilation and mechanical ventilation together is of great significance
Summary
Climate separation zone usually means the transition region between two different climate zones. Natural wind, inside the extra-long tunnels located in climatic separation zone, shows more obvious effect on ventilation than in other regions [1,2] and its velocity in the tunnels can be 4–7 m/s [3]. In the design phase, natural wind is assumed as resistance in the tunnel ventilation modes [4]. If the traditional ventilation method is applied in the design of extra-long tunnel, the number of fans will be unreasonable. Traditional ventilation design is not suitable for tunnels in climatic separation zone. In these extra-long tunnels, the control strategy combining natural ventilation and mechanical ventilation together is of great significance
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