主动式外墙外保温系统节能性研究

Research on the Energy-saving of Active External Thermal Insulation Systems

本文主要针对天津市某一主动式外墙外保温系统(保温层内嵌加热盘管型),利用TRNSYS软件搭建仿真平台,对其供暖季能耗进行了逐时仿真模拟研究,并与其对应的被动式(传统)外墙外保温系统进行对比分析,给出了不同朝向下主动式外墙外保温系统设计热负荷降低率和供暖季相对节能率。并进一步研究了室内温度和盘管进水温度对主动式外墙外保温系统节能性的影响。研究表明:主动式外墙外保温系统可显著降低建筑外墙的供暖设计热负荷与供暖季总能耗,而且可以直接利用各种低品位能源。模拟研究条件下,各朝向外墙设计热负荷降低率在36.28%~42.33%之间,相对节能率在27.70%~35.01%之间,且北向外墙高于南向外墙;相对节能率随着室内供暖温度提高而降低,随着盘管进水温度的提高而提升。

This paper focuses on an active external thermal insulation system with heating coil embedded in the thermal insulation layer in Tianjin, and uses TRNSYS software to build a simulation platform, and conducts a time-by-time simulation study on the energy consumption during the heating season. Compares and analyzes active external thermal insulation system and its corresponding passive(traditional) external thermal insulation system. The design reduction rate of heat load, and the relative energy-saving rate of heating season for the active external thermal insulation system with different orientations are given. Furthermore, the influence of indoor temperature and coil inlet water temperature on the energy-saving performance of active external thermal insulation system is further studied. Research shows that active external wall insulation system can significantly reduce the heating design heat load and total energy consumption of the heating season of building external walls, and can directly use various low-grade energy sources. Under the conditions of the simulation study, the design heat load reduction rate of walls in different orientations is between 36.28%~42.33%, and the relative energy-saving rate is within 27.70%~35.01%, and the relative energy-saving rate of the north wall is higher than that of the south wall. The relative energy-saving rate decreases with the increase of indoor heating temperature and increases with the increase of inlet water temperature of the coil.