【作者】 王晓理；

【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】 “十一五”时期,全国新增水电装机容量7300万千瓦,水电站主厂房空调系统的耗能为水电站建筑能耗的重要组成部分。水电站坝体廊道具有天然的冷却功能,利用坝体廊道自然能对水电站主厂房的送风进行预处理的通风空调设计方案具有现实意义。本文以水电站坝体廊道通风系统为研究对象,简化坝体廊道的实际物理结构,根据相似性原理在实验室内搭建了实验台。以长10m,外径为50mm,壁厚为3mm的圆形截面有机玻璃管深埋于沙土中模拟实际坝体廊道,端部接送风机和空气加热系统,对模拟廊道内通风。利用数据采集系统实时检测通风管道内的温度场变化。考虑坝体廊道内壁具有一定粗糙度的实际情况,利用粘沙法对通风管内表面进行了变粗糙度处理,研究了0.5mm,1.0mm,2.0mm三种绝对粗糙度,通过调节送风参数,分析了影响坝体廊道与流经空气换热的因素。实验的结果表明,水电站坝体廊道对流经的空气有一定的冷却作用,空气的冷却效率受到廊道结构和通风参数等因素的影响。通过对实验数据的分析,得到了廊道内表面粗糙度对空气冷却效率的影响程度。同一测点,在设置的粗糙度范围内,相对粗糙度越大,冷却效率越高:风速在1.5m/s时,相对粗糙度增加一倍,冷却效率最大可增加6%;风速在1.0m/s时,相对粗糙度增加一倍,冷却效率最大可增加8%;风速在0.5m/s时,相对粗糙度增加一倍,冷却效率最大可增加10%。更多还原

【Abstract】 In the"11th Five-Year Plan" period,the new hydropower will be installed in a capacity of 73 million kilowatts,the energy-consuming of air-conditioning system of main building is an important component of energy consumption in hydropower stations.The underground tunnels in Hydropower dam have cooling function,the design which using the cooling function of the dam underground tunnel of hydropower station for the pretreatment of ventilation has the practical significance for the energy-saving.To the ventilation system of Hydropower Dam underground tunnel as the study object, simplifying the physical structure of actual dam tunnel,following the principle of similar,building the test-bed in the laboratory,using a 10 m long organic Glass tube buried in the sand simulating the actual underground tunnel of hydropower station,the diameter of the tube is 50 mm to 3 mm thickness,the blast fan and air heating system using for the ventilation, using the data acquisition system to collected the temperature changes of the ventilation pipe real-time.According to the actual situation of the tunnel,adding the surface roughness of pipe using sand.Change the roughness for 0.5mm,1.0mm,2.0mm,By adjusting the air supply parameters,analysis of the impact factors of heat exchanger between the dam and the air which flowing through the tunnel.The results show that the underground tunnel of hydropower stations have a certain cooling effect on the running through air,and the cooling efficiency is affected by many factors which are the structure of the tunnel,the ventilation parameters and so on.Based on the analysis of experimental data,we obtained how the surface roughness impact the efficiency of cooling effect.The same measurement points,within the roughness which we set in this experiment,the greater the relative roughness,the higher the cooling efficiency:when the wind speed 1.5 m/s, the relative roughness doubled,the largest increase of cooling efficiency is 6 percent,;the wind speed is the 1.0 m/s,doubling the relative roughness,the largest increase of cooling efficiency is 8 percent,the wind speed 0.5 m/s,the relative roughness doubled,the largest increase of cooling efficiency by 10%.更多还原