居住建筑节能率提升对地面辐射供暖散热量的影响

Influence of Residential Buildings Energy Saving Rate of Heating Capacity for Radiant Floor Heating

采用DB11/806—2011《地面辐射供暖技术规范》中所建立的预制沟槽保温板数学模型为基础,计算出居住建筑节能率提升后围护结构内表面温度变化和供暖地面上、下表面的复合换热系数,并采用ANSYS软件对其进行数值模拟,可知居住建筑节能率由65%提高到80%以上,地面辐射供暖系统的户间传热量随之降低,但对于地面辐射供暖系统的地面温度分布及单位面积散热量影响并不明显,进而得出在室内设计温度和加热管管间距一定的情况下,地面辐射供暖系统表面散热量与供回水平均温度近似呈线性关系。在一定条件下,可适当提高地板采暖供水温度、增大加热管管径以及减小加热管管间距。研究结果可为地面辐射供暖系统的实际应用提供参考和依据。

Mathematical model of pre-grooved insulation board heating floor based on Technical code for floor radiant heating(DB11/806-2011) is applied. The temperature variation inside enclosure structure and the complex heat transfer coefficient for upper and lower heating floor surface are calculated after the increase of residential buildings energy efficiency. The ANSYS software is utilized for numerical simulation. It is found that the energy saving rate of residential buildings increases from 65% to more than 80%, the heat transfer of radiant floor heating system decreases, but the influence on the ground temperature distribution and heat dissipation per unit area of the ground radiant heating system is not obvious. And the same of the indoor design temperature and heating tube spacing. It’s concluded that the approximately linear relationship between heating capacity of pre-grooved insulation board heating floor and it average temperature of supply and return water. And under certain circumstances, increase of the water supply temperature for floor heating, increase of the heating pipe diameter and decrease of heating tube spacing. The research results can provide reference and basis of the practical application for radiant heating system.