Experimental Study on Dynamic Monitoring of Thermal Environment in Cable Tunnel and Influence of Ventilation on Dehumidification Effect
In this paper,through the field test of a ventilation interval of a cable tunnel in Shanghai in summer,the distribution of temperature and humidity in the cable tunnel is analyzed. The results show that the average temperature of the equipment room decreases from the first to the fourth floor of the air supply shaft due to the poor heat transfer ability of the soil. As a result,the ability of the air to hold water vapor is reduced,resulting in the relative humidity of the equipment room located four floors underground as high as 97％,and there is serious condensation phenomenon. The temperature and humidity distribution at the connection point between the air supply shaft and the cable tunnel is extremely unstable,and there is a condensation area at the entrance section of the cable tunnel ranging from 0 to 180 meters. The relative humidity of the air is 95％ to 100％,which is very harmful to the electronic equipment in the tunnel. The closer the cable tunnel is to the exhaust shaft,the more stable the temperature and humidity distribution is. In addition,the dehumidification effect of the existing mechanical ventilation is verified. The relative humidity of the air in the cable tunnel's condensation area decreased by about 30％-40％ after the fan was turned on to perform mechanical ventilation in the cable tunnel,resulting in a decrease in wall temperature of the tunnel of about 2 ℃. This proved the efficiency of the dehumidification in the cable tunnel by mechanical ventilation.
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