在北方寒冷地区,建筑物内都设有采暖系统,且大多数采用上供下回式系统,回水管线布置方式有两种:①将回水管线布置在地坪上;②回水管线布置在地坪下的管沟中。前者的优点是便于检修,但影响底层房间使用,也有碍美观;后者的房间整齐美观,但主 In northern cold regions, heating systems are installed in the buildings, and most of them are provided with upper-and-lower-back systems. There are two types of return water piping: 1) Place the return pipeline on the floor; 2) Return pipeline arrangement In the trench under the floor. The advantage of the former is that it is easy to overhaul, but it affects the use of the ground floor rooms and also hinders the beauty; the latter’s rooms are neat and beautiful, but the main