热能表标准装置由水泵、控温水箱、试验管路、标准流量计组、称重设备、控制设备、加热系统等组成。它和一般液体流量标准装置的结构和工作原理基本一致,区别在于介质需要保持一定的温度。一般液体流量标准装置的换向器是开式的(如图1所示),而在热水装置上的换向器是闭式的,原 Heat meter standard device by the pump, temperature control water tank, test pipeline, standard flow meter group, weighing equipment, control equipment, heating systems and other components. It and the general liquid flow standard device structure and working principle is basically the same, the difference is that the medium needs to maintain a certain temperature. General liquid flow standard device commutator is open (as shown in Figure 1), and in the hot water device on the commutator is closed, the original