土建风道沿程阻力计算
Calculation of frictional resistance for brick or concrete ducts
摘要：
空气温度和绝对粗糙度是影响高层建筑加压送风系统和排烟系统风道沿程阻力的主要因素。计算表明，当实际的空气温度和粗糙度与设计值有一定偏差时，实际的风道沿程阻力相比设计值会有较大的改变，且超过了规范的允许误差，系统实际运行达不到设计要求。
关键词：土建风道,沿程阻力,粗糙度,空气温度
Abstract：
The air temperature and absolute roughness are key factors affecting frictional resistance of brick or concrete ducts for pressurization air supply systems and exhaust smoke systems in highrise buildings. Calculation results show that when a deviation occurs in actual air temperature and roughness from the designed value, there will be a distinct difference between the design and actual frictional resistance, and the error will exceed the allowed value specified in related codes, and thus the system operation can not meet the design demand.
Keywords:brick or concrete duct, frictional resistance, roughness, air temperature