Study on local ventilation method of cable compartment in utility tunnel based on jet fan
The long construction mileage demand of the utility tunnel,and the addition of fire compartments in the tunnel makes the ventilation and heat dissipation problem in the cable compartment very serious.The longer the length,the temperature of the tunnel will gradually rise,and the increase of the fire door will form a high temperature gathering area in a small space such as the corner of the tunnel,which will hinder the heat dissipation of the utility tunnel.The purpose of local ventilation is to eliminate temperature anomalies with a small air volume and reduce the overall ventilation volume of the utility tunnel.In this paper,numerical simulation combined with experimental verification is used to compare the conventional cable compartments with the local ventilation cable compartments under different boundary conditions,and the cooling law of local ventilation strategy is analyzed.The results show that increasing the number of air changes under the same total air volume can strengthen the heat dissipation in the fan-controlled area,the total air volume of the tunnel will interact with the local fan air volume,and changing the total air volume does not significantly improve the heat exchange.By using local ventilation methods,the temperature reduction in the cable compartments is further increased,and the temperature in the local area will be 2.58℃ lower than that in conventional cable compartments.The local ventilation method can achieve a cooling effect similar to that of conventional working conditions with a small air volume and has certain advantages in energy saving.
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