地铁集中供冷系统二次泵管路经济流速和经济保温厚度的确定
Determination of economic velocity and economic insulating layer thickness of secondary pump system for central cooling system of underground railway stations
摘要：
结合工程实例，通过建立二次泵变流量系统的优化模型，以年成本最低为原则，对地铁系统二次泵管路经济流速和经济保温厚度进行了计算和分析，得出影响经济流速的主要因素是管材类型、电价、区间隧道温度、输送半径、车站负荷、保温层价格及其导热系数，影响保温厚度的主要因素是区间隧道温度、电价、保温层价格及其导热系数、系统COP、车站负荷和冷水供水温度。采用大温差二次泵变流量系统供水管路和回水管路的热损耗有明显差异，建议结合管路特性，按不同区间分别计算供、回水管路的经济流速和经济保温厚度。
Abstract：
With an actual project, develops an optimal model of the variable secondary pump water system, calculates the economic velocity and economic insulating layer thickness with the minimum annual cost as the principle, and obtains that the major influencing factors on economic velocity are pipe type, power price, temperature in section tunnels, transportation radius, cold load of underground railway stations, price and thermal conductivity of insulation materials while the factors on economic insulating layer thickness are temperature in section tunnels, power price, price and thermal conductivity of insulation materials, system COP, cooling load of underground railway stations, temperature of chilled water supply. The analysis result shows that there is a remarkable distinction of heat loss between water supply and return pipelines in large temperature difference variable secondary pump water systems. Therefore, the economic velocity and economic insulating layer thickness should be calculated respectively in term of characteristics of water supply and return pipelines in different section tunnels.
Keywords:variable secondary pump water system, optimal model, economic velocity, economic insulating layer thickness, minimum annual cost