An Analysis on the hydraulic resistance balance in the household horizontal heating system

This article analyzes the influence on hydraulic resistance balance from the temperature differences between supply and return water, the specific frictional resistance of vertical two pipe, thermal pressure and pressure drop of household in the household heating system. It adopts Kirchhoffs law to evaluate the hydraulic balance status of vertical two-pipe down feed direct return system in the household heating system and draws the conclusion that an vertical two-pipe down feed direct return system is more suitable for the household heating system, where there is no balancing regulator. Furthermore, this article calculates the range of the average specific frictional resistance of the common riser, and determines the factors that might affect the hydraulic resistance balance.