5 Jan 91
RT = RN + RW + RC
RT = 2.26 + 0.04 + 0 = 2.30 ohms
ohms, the design using fourteen 2-in. by 60-in.
packaged ceramic anodes will work.
Calculate the rectifier voltage (VREC) from equation
VREC = (I) (RT) (120%)
I = 8.2 amp (Current requirement from step 2,
120% = Rectifier voltage capacity design safety
= 8.2 amp x 2.30 ohms x 1.2
= 22.6 V
c. Select rectifier.
Based on the design requirement of 22.6 V and 8.2 amp, a
rectifier can be chosen.
A 12-amp, 24-V unit is selected
because this is the nearest standard commercial size