According to the calculation formula of heat zhi: daoq = g c (TG-th), it can be known that when the heating system provides the same heat q to the thermal households, the temperature difference between supply and return water Δ δt = TG-th is directly proportional to the circulating water quantity g, that is, if the temperature difference between supply and return water in the system is large, the circulating water quantity will be small, and the power consumption of the pump will be greatly reduced. From the following example, we can see the relationship between temperature difference and power consumption.
Extended data:
For example, the design heat load of a heating system is 7MW, and the temperature difference between supply and return water of primary network is Δ t = 30℃. After calculation, the circulating water volume is 200 m/h. The diameter of the external network is DN200. Look-up table shows that the resistance coefficient along the way is 170Pa/m/m ... According to hydraulic calculation, the total resistance loss along the pipe network is 50m water column. If the water pump is selected according to this flow and lift, the power of the water pump is 45KW.
Increasing the temperature difference between supply and return water of heating system can greatly reduce the operating power consumption. At the same time, because the resistance loss is greatly reduced, the power supply system with relay pump station can be made, and the relay pump station is cancelled, saving the construction investment and operation cost of the relay pump station.