Nine points for selection of centrifugal fan

1 centrifugal fan selection of main control parameters for air flow, total pressure, efficiency and ratio of sound pressure level, speed and motor power.

2 high pressure centrifugal fan is divided into P, 3000Pa, 1000 MV = P = 3000Pa, P < three 1000Pa low pressure rating. Selection should be based on the physical and chemical properties of the gas, as well as the use of different choice of different types of centrifugal fan.

3 centrifugal fan selection, should consider the calculation error of air leakage loss, pipeline system, and the negative deviation of centrifugal fan actual air volume and air pressure, with the air flow rate is 1.05 ~ 1.1, the wind pressure is safety factor of 1.10 ~ 1.15. However, it is not appropriate to use too much safety factor to prevent the centrifugal fan running in low efficiency area for a long time.

4 pay attention to the matching relation between the resistance characteristics of the pipe network and the centrifugal fan. In order to make the stable operation of the centrifugal fan and the centrifugal fan should work in the vicinity of the maximum efficiency point of centrifugal fan operating point is located on the right side of the total pressure peak performance curve (i.e., air side, and generally located in the full pressure peak of 80%). The design efficiency of the fan should be no less than 90% of the maximum efficiency.

5 the use of variable frequency centrifugal fan, the system should be calculated as the total pressure loss of rated wind pressure, but the fan motor power should be calculated on the value of additional 15%~20%.

6 when the fan operating conditions (such as gas temperature, atmospheric pressure, etc.) and the fan sample is inconsistent, the performance of the fan should be corrected.

7 selection of centrifugal fan, should be carefully compared to give priority to the selection of high efficiency, small size, light weight, large adjustment range of products.

8 selection of centrifugal fan, not only to consider the issue of one-time investment, more important is to consider the long-term economic results.

9 more than three parallel or series operation, should choose the same type of centrifugal fan.