１前言 热交换设备是热源与供热管网之间常用的接口设备，选取一种高效节能、性价比高的换热设备成为人们追求的目标。本文对我厂使用沈阳飞鸿达节能技术开发中心生产的ＪＭＨ－３００型喷射式混合加热器的情况进行介绍。２供热管网改造前的状况 我厂供热管网系统始建于１９８ 1 Introduction Heat exchange equipment is a commonly used interface between heat source and heating pipe network equipment, select a highly efficient energy-saving, cost-effective heat exchange equipment has become the goal of people. In this paper, I plant using Shenyang Fei Hongda energy-saving technology development center production JMH-300 jet hybrid heaters are introduced. 2 heating pipe network before the transformation of the status of our factory heating pipe network system was built in 198