What are single-pipe heating system and double-pipe heating system? What are their characteristics?

1. Single-pipe heating system: it is a general term for vertical single-pipe heating system and horizontal single-pipe heating system. It is divided into: vertical single-pipe heating system, and each group of vertically arranged radiators is connected in series along a vertical pipe. Horizontal single-pipe heating system The radiator arranged horizontally is connected in series along a main pipe, which is also called horizontal series single-pipe heating system. The heat medium flow in each vertical tube or horizontal tube of single-tube sequential heating system flows through the radiator in turn, which is also called single-tube downstream heating system. The heat medium in each group of vertical pipes or horizontal pipes of the single-pipe jumping heating system does not all flow through each group of radiators one by one, but a part of the single-pipe heating system is diverted.

2. Double-pipe heating system: The double-pipe heating system of high-rise buildings has two forms: vertical double-line single-pipe system and horizontal double-line single-pipe system. The double-line single-pipe system is formed by connecting vertical or horizontal "N"-shaped single pipes. The heat dissipation equipment usually adopts serpentine tube or radiant plate with high pressure bearing capacity (single piece or embedded in the wall to form a wall structure).

Extended data:

The temperature of heat medium entering each radiator of double-pipe heating system is the same, which can generally be considered as the water supply temperature of heat source. At present, the highest design temperature of hot water heating medium in indoor heating system of civil buildings in China is 95℃, which is the highest temperature of the system. From the adjustability analysis of heat medium water supply temperature to radiator heat dissipation, it can be seen that high water supply temperature has good heat dissipation adjustment performance. At the same time, the temperature difference between supply and return water of the system is the largest, and the temperature difference between supply and return water of most domestic double-tube heating systems is 25℃. Because of the large temperature difference, the flow through the radiator is the smallest among the three heating systems under the condition of satisfying the same heat dissipation.

Baidu Encyclopedia-Double Pipe Heating System

Baidu encyclopedia-single pipe heating system