Economical Insulation Layer of the Secondary Pump Lines in the Subway Central Cooling System

Hua Yin, Huafang Guo, Zhenrong Lin, Bo Zeng
2017 Proceedings of the 2017 2nd International Conference on Civil, Transportation and Environmental Engineering (ICCTE 2017)   unpublished
The economical insulation thickness of the secondary pump lines in the subway system was calculated and analyzed based on the established optimization model of the secondary pump water system and the principle of lowest thermoeconomics cost. The main influencing parameters of the optimal insulation thickness were disclosed, including station loads, transportation radius, tunnel air temperature, tunnel wind speed, supply water temperature, supply-return water temperature difference, heat
more » ... rence, heat conducitivity coefficient of the insulation layer, and inner diameter of the pipeline. The loss of refrigeration capacity in the supply and return pipes of the secondary pump water system varies significantly because of the supply-return water temperature difference (generally ≥ 5 °C), thereby resulting in a large gap in the economical insulation thickness. Therefore, calculating the insultion thickness of the supply and return pipes by combining their characteristics is recommended.
doi:10.2991/iccte-17.2017.126 fatcat:lyfum2cqrbdgvjev46xbaaolei