【作者】 李丽；

【导师】 李安桂；

【作者基本信息】 西安建筑科技大学 ， 供热、供燃气、通风及空调工程， 2008， 硕士

【摘要】 随着经济的持续增长,我国逐步成为了世界能源消耗大国。而煤、油、气等石化能源作为不可再生资源正面临着严重的危机和挑战。因此,寻求节能、环保、可持续发展的空调方式来降低建筑能耗,就是一个急需解决的问题。土壤有巨大的蓄冷蓄热能力,是天然、环保可再生能源,水电站通风空调设计中采用无压尾水洞引风系统,系统简单、节能、造价低廉,有广阔的应用前景。本文通过建立地下水电站无压尾水洞引风降温试验模型,测定空气流速为0.5m/s、1.0m/s、1.5m/s,尾水流速为0.1m/s、0.2m/s、0.3m/s,尾水洞壁面为光滑及相对粗糙度为0.01、0.04的情况下不同进深点的温度。得出了无压尾水洞引风降温效果随风速、尾水流速、壁面粗糙度以及隧洞长度的变化规律。结果表明尾水洞壁面粗糙度、水流速度、空气速度和隧洞长度对尾水洞引风换热都有影响。当引风速度从0.5m/s到1.0m/s,1.0m/s到1.5m/s时,速度每增加0.5m/s,对流换热系数平均分别增加11.823 w/m~2·℃和8.013 w/m~2·℃;当尾水流速从0.1m/s到0.2m/s,0.2m/s到0.3m/s时,尾水流速每增加0.1m/s时,对流换热系数平均分别增加2.459 w/m~2·℃和2.871w/m~2·℃;当壁面从光管到相对粗糙度为0.01,相对粗糙度为0.01到相对粗糙度为0.04时,对流换热系数平均分别增加2.419w/m~2·℃和1.897w/m~2·℃。更多还原

【Abstract】 With economical development,China has been one of the large energy consumption country.While the petrochemical energy,including coal,oil,gas etc,as nonrenewable energy sources is further declining.So it is urgent to find an energy conservation,environment protection and sustainable development air conditioning method to reduce building energy consumption.The soil,which has tremendous thermal storage capacity,and the tail water matains relative low temperature,which are natural,renewable and environment protection energy source so that tailrace tunnel ventilation has wide application prospect in ventilation and air conditioning design of hydropower station for its simplity,energy conservation and low costing.An experimental study was undertaken to insight into the cooling performance of tailrace tunnel ventilation in hydropower stations.The variation law of that with the inlet air velocity, tail water velocity and the roughness of the inwall can be got from the measurement of air temperature in all stations.The result indicates that the roughness of inwall,velocity of tail water,velocity of air and the length of the runnel all have effect to ventilation and heat exchanger of tailrace tunnel.As the air velocity changer from 0.5 m/s to 1.0 m/s,or from 1.0 m/s to 1.5 m/s,the coefficient of heat transfer mean increment are 11.823 w/m~2·℃and 8.013 w/m~2·℃.While the tail water velocity changer from 0.1 m/s to 0.2 m/s,or from 0.2 m/s to 0.3 m/s,the tail water velocity each increase 0.1 m/s,the coefficient of heat transfer mean increment are 11.823 w/m~2·℃and 8.013 w/m~2·℃.When the roughness of the inwall changer from smooth surfeace to the relative roughness factor(RRF)=0.01,or from RRF=0.01 to 0.04,the coefficient of heat transfer mean increment are 2.419 w/m~2·℃and 1.897 w/m~2·℃.All show the inwall of tailrace tunnel is rougher,the effect of heat exchange is stronger,and pushing the velocity of tail water can increase heat exchange.更多还原