本文件规定了能够根据系统的介质温差确定水基表面加热和冷却系统热通量的程序和条件。根据设计文件和模型，通过计算确定水基表面加热和冷却系统的热性能及其与本文件的一致性。这样就可以对水基表面加热和冷却系统进行统一的评估和计算。 结果给出了加热/冷却表面的表面温度和温度均匀性、水和空间之间的标称热流、相关的标称介质温差，以及热流与决定变量之间关系的特征曲线场。 本文件包括基于有限差分法或有限元法的通用方法，以及根据管道位置和建筑结构类型的简化计算方法。

This document specifies procedures and conditions to enable the heat flux in water-based surface heating and cooling systems to be determined relative to the medium differential temperature for systems. The determination of thermal performance of water-based surface heating and cooling systems and their conformity to this document is carried out by calculation in accordance with design documents and a model. This enables a uniform assessment and calculation of water-based surface heating and cooling systems. The surface temperature and the temperature uniformity of the heated/cooled surface, nominal heat flux between water and space, the associated nominal medium differential temperature, and the field of characteristic curves for the relationship between heat flux and the determining variables are given as the result. This document includes a general method based on finite difference or finite element Methods and simplified calculation methods depending on position of pipes and type of building structure.