大型供冷/热管网优化设计方法研究
Optimization method for hydraulic calculation of large-scale cooling and heating network
摘要：
提出了一种大型供冷/热管网的优化设计方法，该方法以管网年折算费用最小为目标，建立了年折算费用与管径的单变量非线性函数关系，采用微分法分段求出各管段的优化管径。结合案例，分别采用假定流速法和优化设计方法进行水力计算，结果表明：采用优化设计方法比传统设计方法管径有所放大，但水泵运行能耗降低39.5%，冷/热量损失减少11.2%，管网的年折算费用节省10.1%，具有显著的经济效益。
Abstract：
Proposes an optimization method for hydraulic calculation of large-scale cooling and heating network. Aiming at the minimum annual equivalent cost of the pipe network, establishes the single-variable nonlinear relationship between annual equivalent cost and pipe diameter. Obtains the economic pipe diameters of different pipe network sections based on differential method. Take a project as the example for analysis, adopts two different methods for calculation, including the velocity assumption method and the optimum method proposed in this paper. The results show that the energy saving and the economy of the optimization design method are superior to the traditional design method. The running energy consumption of water pumps is reduced by 39.5%, and the cooling/ heating loss is decreased by 11.2%. For annual equivalent cost, a saving of 10.1% is obtainable, with significant economic benefit.
Keywords:large-scale cooling and heating network, optimization design, energy saving, economic effect, annual equivalent cost