Winter temperature distribution characteristics and energy saving potential of ventilation in extra-long power cable tunnels
To obtain the heat exchange situation and energy saving potential in the tunnel during winter ventilation,a numerical simulation study was conducted to investigate the temperature distribution characteristics in the extra-high voltage power tunnel with extra-long ventilation interval when the outdoor air temperature is from 4℃to 12℃in winter.The user-defined programs of ANSYS Fluent 19.2 software were used to complete the simulation of the entire length of the power tunnel.The heat transfer characteristics of the tunnel in winter and the potential for energy saving in ventilation were analyzed,and the critical ventilation volume that can achieve the maximum energy saving effect in winter was defined and given.The results show that the power tunnel with extra-long ventilation interval has a potential to reduce the ventilation volume and thus realize energy saving.The soil is exothermic in the front section of power tunnels and endothermic in the back section in winter.Soil heat release is affected by outdoor air temperature,while soil heat absorption is affected by the outdoor air temperature and the ventilation volume.The lower the outdoor temperature in winter,the smaller the critical ventilation volume,and the greater the potential for ventilation energy saving.When the outdoor temperature is from 4℃to 12℃in winter,the maximum possible energy saving rate is 91%.
power cable tunnelextra-long ventilation intervaltemperature distributionenergy saving potentialnumerical simulationheat transfer characteristicswinter
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