Numerical Calculation of System Resistance and Air Volume for Air cooling Electrical Cabinet
HUANG Chaoyang
CHEN Fei
LI Jing
QIAO Liang
Abstract：This paper analyses the conventional air cooling electrical cabinet fan operation principle,the key to calculate the fan running state is P-Q curve and the system resistance curve of the fan,then the P-Q characteristic curve equation of fan is ob?tained by fitting method and the system resistance equation is gotten by using numerical calculation method to calculate the local drag coefficient of the system,then the machine working point is obtained by solving intersection of P-Q curve and the system resis?tance curve,and the optimal selection of air system will be improved to meet the requirements of the system and air duct and fan. Fi?nally a small program is written by using VB,the least square method is used to automatically solve the fan working point of fan auto?matic selection and optimization.
Keywords：P-Q curvesystem resistance curveequivalent ventilation areaair volume ratiofan operating point
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1631-1634 )