ISO 9869-1:20 14描述了用于测量平面建筑部件的热传递特性的热流计方法，该平面建筑部件主要由垂直于热流并且不具有显著的横向热流的不透明层组成。 可以测量的特性有: a)表面到表面的热阻R和热传导Λ； b)如果两个环境的环境温度被很好地定义，则总热阻RT和从环境到环境的透射率U。 热流计测量方法也适用于由垂直于热流的准均匀层组成的部件，条件是紧邻热流计(HFM)的任何不均匀性的尺寸远小于其横向尺寸并且不是可以通过红外热成像检测到的热桥。ISO 9869-1:20 14描述了要使用的设备、设备的校准程序、安装和测量程序、数据分析（包括系统误差的校正）和报告格式。

ISO 9869-1:2014 describes the heat flow meter method for the measurement of the thermal transmission properties of plane building components, primarily consisting of opaque layers perpendicular to the heat flow and having no significant lateral heat flow. The properties which can be measured are: a) the thermal resistance, R, and thermal conductance, Λ, from surface to surface; b) the total thermal resistance, RT, and transmittance from environment to environment, U, if the environmental temperatures of both environments are well defined. The heat flow meter measurement method is also suitable for components consisting of quasi homogeneous layers perpendicular to the heat flow, provided that the dimensions of any inhomogeneity in close proximity to the heat flow meter (HFM) is much smaller than its lateral dimensions and are not thermal bridges which can be detected by infrared thermography. ISO 9869-1:2014 describes the apparatus to be used, the calibration procedure for the apparatus, the installation and the measurement procedures, the analysis of the data, including the correction of systematic errors and the reporting format.