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// Given:-
T1 = 293.0 // In kelvin
P1= 1.01325 * (10**5) // In pascal
V1max= 1.3 // maximum velocity of entering air in m/s
T2max= 305.0 // maximum temperature at the exit in kelvin
pec= -80.0 // power received by electronic components in watt
Pf= -18.0 // Power received by fan in watt
R= 8.314 // Universal gas constant
M= 28.97*(10**(-3)) // Molar mass of air in kg
Qcvdot=0 // Heat transfer from the outer surface of the electronics enclosure to the surroundings is negligible.
Cp= 1.005*(10**3) // in j/kg*k
// Calculations:-
Wcvdot = pec +Pf // total electric power provided to electronic components and fan in watt
mdotmin= (-Wcvdot)/(Cp*(T2max-T1)) // minimum mass flow rate
v1= ((R/M)*T1)/P1 // specific volume
A1min = (mdotmin*v1)/V1max
D1min = (4*A1min/(%pi))**(0.5)
// Results:-
printf( ' The smallest fan inlet diameter is %.2f cm',D1min*100)
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