热力管加热桥面抗冰融冰试验研究

摘要

To study the influence of anti icing and ice melting of bridge deck by the heating of heat pipe on the traffic safety of highway , the model tests of ice melting by the heat pipe were carried out in the artificial environment chamber through pre -paring the bridge samples with the size of 600 mm ×600 mm ×380 mm.The results showed that the temperature rise rate and ice melting time on the upper surface of the samples depended on the heat pipe spacing , heat insulation layer , air velocity , environment temperature and external surface temperature of heat pipe .Under the same working conditions , the ice melting capacity of the heat pipe with the spacing of 100 mm was greater than that of 150 mm.When without the heat insulation lay-er, the heat quantity transferring upward from the heat pipe with the spacing of 100 mm accounted for 13.4% of the total heat quantity, and the ice melting time was 211 min, while the heat quantity with 150 mm spacing accounted for 18.3%of the total heat quantity , and the ice melting time was 271 min.After laying the heat insulation material with the thickness of 2 mm and the thermal conductivity coefficient of 0.062 W/( m· K) under the heat pipe layer , the heat quantity transferring upward from the heat pipe with the spacing of 100 mm accounted for 46.9 %of the total heat quantity , and the ice melting time was 175 min, while the heat quantity with 150 mm spacing accounted for 51.9%of the total heat quantity , and the ice melting time was 161 min.Laying the heat insulation material under the heat pipe layer can effectively prevent the downward heat transfer , so the ice melting time will be shortened .%为了研究热力管加热桥面抗冰融冰对于公路交通安全的影响,制作了尺寸为600 mm×600 mm×380 mm的桥梁试件,在人工环境室对热力管融冰进行了模型试验.结果表明:试件上表面温升速率和融冰时间取决于热力管间距、隔热层、风速、环境温度和热力管外表面温度.在相同工况条件下,100 mm间距的热力管融冰能力要大于150 mm间距的热力管,无隔热层时,100 mm间距热力管向上传递的热量占总加热量的13.4%,融冰时间为211 min;150 mm间距热力管向上传递的热量占总加热量的18.3%,融冰时间为271 min.在热力管层下面铺设厚度为2 mm、导热系数为0.062 W/(m·K)的隔热材料后,100 mm间距热力管向上传递的热量占总加热量的46.9%,融冰时间为175 min;150 mm间距热力管向上传递的热量占总加热量的51.9%,融冰时间为161 min.热力管层铺设隔热材料可有效阻止热量向下传递,从而缩短融冰时间.