供热管网经济比摩阻的重要性及其计算方法  

The importance of economic pressure drop per unit length of heating piping network and its calculation method

作　　者：李法庭 麻晗 介鹏飞 LI Fa-ting;MA Han;JIE Peng-fei

机构地区：[1]北京石油化工学院

出　　处：《节能》2019年第12期86-88,共3页Energy Conservation

摘　　要：集中供热系统已得到广泛开发,它被认为是提高建筑物空间供暖能效的有效方法。比摩阻在确定管道直径方面起着重要作用。较高的比摩阻会导致较高的流速,这意味着当选择更高的比摩阻时,使用直径更小的管道。因而泵的电能成本增加,而管道投资成本和热损失成本降低。相反,泵的电能成本减少,而管道投资成本和热损失成本增加。因此,供热管网存在一个经济比摩阻使管网的寿命周期成本最小。微分法是建立经济比摩阻数学模型的常用方法,使用微分法对目标函数关于比摩阻求导,并使导函数等于零,可以得到供热管网的经济比摩阻。District heating systems have been developed widely because it is considered an effective method to improve the energy efficiency of the space heating system in buildings. The pressure drop per unit length plays an important role in determining pipe diameters. Higher pressure drop per unit length results in higher flow velocity. It means that pipes with smaller diameters are used when higher pressure drop per unit length is selected. Therefore, the pumping cost increases, while the pipe investment cost and heat loss cost decreases. On the contrary, the pumping cost decreases, while the pipe investment cost and heat loss cost increases. Therefore, there is an economic pressure drop per unit length of heating piping network to minimize the life cycle cost of heating piping network. The differential method is a common method to establish a mathematical model of economic pressure drop per unit length. Using the differential method to obtain the derivative of the objective function, and the derivative function is equal to zero. Then, the economic pressure drop per unit length of the heating piping network can be obtained.

关 键 词：集中供热 供热管网 经济比摩阻 

分 类 号：TU996[建筑科学—供热、供燃气、通风及空调工程]