本文件规定了用于空间供暖、空间冷却和生活热水（DHW）的水基配电系统的能源性能计算。 本文件适用于从分布式水到空间的热通量以及相关泵的辅助能量。 可以计算任何时间间隔（小时、月和年）的热通量和泵的辅助能量。输入和输出数据是时间间隔的平均值。 除了计算水基配电系统的能源性能外，只要测量值遵循整个性能计算的时间间隔，或者可以划分为这些时间间隔，就可以使用测量值。

This document specifies the energy performance calculation of water-based distribution systems for space heating, space cooling and domestic hot water (DHW). This document is applicable to the heat flux from the distributed water to the space and the auxiliary energy of the related pumps. The heat flux and the auxiliary energy for pumps can be calculated for any time interval (hour, month and year). The input and output data are mean values of the time interval. Instead of calculating the energy performance of water-based distribution systems, it is also possible to use measurements as long as they follow the time intervals of the whole performance calculation or can be divided into those time intervals.