ISO 15927-5:2004规定了用于确定建筑物空间采暖设计热负荷的气候数据的定义，计算方法和方法。这些包括冬季外部设计的空气温度和相关的风速和方向。 通过地面的热损失，这也有助于建筑物的热负荷，取决于长期的温度变化;计算地面热损失的方法在ISO 13370中给出

ISO 15927-5:2004 specifies the definition, method of calculation and method of presentation of the climatic data to be used in determining the design heat load for space heating in buildings. These include the winter external design air temperatures and the relevant wind speed and direction, where appropriate. Heat loss through the ground, which also contributes to the heat load for buildings, depends on longer-term temperature changes; methods for calculating ground heat loss are given in ISO 13370.