The calculation method of the head of the cooling water pump is as follows. Cooling pump heads are often encountered in central air conditioning system engineering. The process of installing the central air conditioner by the operator
The calculation method of the head of the cooling water pump is as follows. Cooling pump heads are often encountered in central air conditioning system engineering. In the process of installing the central air conditioner, the operator needs to calculate the cooling pump head to select a suitable cooling water pump to better utilize the cooling effect. So next we will look at the calculation method of the cooling pump head.
Calculation method of cooling pump head: ∑△h=Hf+Hd+Hm.Hf, Hd——water system resistance and local resistance loss Pa.Hm——equipment resistance loss Pa.1. chiller resistance: take 80 kPa (8m water column); 2. Pipeline resistance: take the resistance of the decontamination device, water collector, water separator and pipeline in the freezer room to 50 kPa; take the length of the pipeline on the transmission and distribution side 300m and the friction resistance 200 Pa/m, the friction resistance is 300*200=60000 Pa=60 kPa; if the local resistance on the distribution side is 50% of the friction resistance, the local resistance is 60 kPa*0.5=30 kPa; Resistance is 50 kPa+60 kPa+30 kPa=140 kPa (14m water column); 3. Air conditioner end device resistance: The resistance of the combined air conditioner is generally larger than the fan coil resistance, so the former resistance is 45 kPa (4.5 water column) ); 4. Resistance of the two-way regulating valve: take 40 kPa (0.4 water column). 5. Therefore, the sum of the resistances of the various parts of the water system is: 80 kPa + 140 kPa + 45 kPa + 40 kPa = 305 kPa (30.5 m water column) 6. Pump head: Take a safety factor of 10%, then the lift H = 30.5 m *1.1=33.55m. According to the above estimation results, it is possible to basically grasp the range of pressure loss values ​​of air-conditioning water systems of buildings of similar scale, especially to prevent over-conservation of system pressure loss due to unconserved calculations. The lift was too large, resulting in wasted energy. ∑△h refers to the sum of the most unfavorable loop resistance and local resistance of the system plus the resistance of the chiller and the resistance of the end device.
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