技术中心

【英文篇名】 Error analysis of specific frictional head loss in hot-water heating pipelines 【作者中文名】 高振生; 严应政; 邓沪秋; 【作者英文名】 By Gao Zhensheng; Yan Yingzheng and Deng HuqiuChang’an University; Xi’an; China; 【作者单位】 长安大学; 【文献出处】 暖通空调, Hv 水力计算; 比摩阻; 【英文关键词】 mean temperature; hydraulic calculation; specific frictional head loss; 【摘要】 分析研究了95℃/70℃热水供暖系统按平均温度60℃进行管路水力计算的不合理性。计算得到了比摩阻的理论误差:层流区42.56%、临界区-12.77%、湍流光滑区8.51%、湍流过渡区小于8.51%、湍流粗糙区误差可以忽略。给出了湍流区沿程阻力系数绝对误差的计算式。 【英文摘要】 Analyses the unreasonability of hydraulic calculation based on the mean temperature 60 ℃ in a heating system with 95 ℃/70 ℃ hot water. Obtains the theoretical errors of specific frictional head loss including 42.56% for laminar flow, -12.77% for critical area, 8.51% for turbulence smooth area, smaller than 8.51% for turbulence transition area and neglectable error for turbulence rough area. Gives a calculation formula of the absolute error of specific frictional head losses.