In the hot water heating system, the hydraulic condition of the system can not be absolutely balanced. Due to the system's hydraulic imbalance, the actual flow of the system will be greater than the calculated flow rate. The result is a design operating point shifts to the right-hand side G - H curve, the bias point of the level and system hydraulic imbalance size related.
If you use a steep drop in the G - h the characteristic curve of pump, when the operating point offset to the right, due to pump generated pressure decreased a lot, in system is the most unfavorable loop network terminal heat user traffic flow will be significantly reduced, the balance of the hydraulic regime of hot water heating system is unfavorable. The BA type, SH type and SA type water pump unit H G characteristic curve is relatively flat, so in the hot water heating system, it is advisable to use this type of pump unit as the network circulating water pump unit.
