The civil Engineering (Transportation) computer lab has 20 machines. Each machin

Question

The civil Engineering (Transportation) computer lab has 20 machines. Each machine draws 300 W of power, most of which is given off as heat. Assuming that 100 percent of the electrical demand is given off as heat, estimate the amount of energy that is waste each year if the computers are left running during 8 hours at night that the lab is closed. (Note that the computers draw 50% less power when they are in “sleep mod” as they do when they are active.) The civil Engineering (Transportation) computer lab has 20 machines. Each machine draws 300 W of power, most of which is given off as heat. Assuming that 100 percent of the electrical demand is given off as heat, estimate the amount of energy that is waste each year if the computers are left running during 8 hours at night that the lab is closed. (Note that the computers draw 50% less power when they are in “sleep mod” as they do when they are active.)

Explanation / Answer

computer full usage in day = 24-8hours at night

= 16 hours

computer usage at half capacity at night= 8 hours

total energy converted to heat = power of computer consumed*time of usage

= 300watt*16hours+ (300/2)watt* 8hours

= 4800+1200

= 6000 watt-hours

total heat produced by one computer in year= 365*6000

=2190000watt-hours

= 2190 KWh

total heat by 20 computers = 20*2190

= 43800KWh

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