Question

A major manufacturing company is looking into the total costs of operating a piece of equipment under three different scenarios:

Scenarios:

1. No power factor correction

2. Install a 20 uF capacitor in parallel with the load at the source for $200

3. Install a 20 uF capacitor in parallel with the load at the load for $250

Assume that the cost of electricity is based on the real power supplied with different rates for different power factors as shown below. Assume that the machine runs 24 hours/day for 360 days/year.

PF----Rate$/kWH

0.98 to 1.00-----0.120

0.96 to 0.979-------0.121

0.94 to 0.959---------0.122

0.92 to 0.939--------0.123

0.90 to 0.919----------0.124

0.88 to 0.899----------0.125

Given:

Source:

R= .5ohm

Vs= 116.8

Is=2.78

Ps=302W

PFs=.91

Load:

Pl=293

PFl=0.91

Answer 1