Refrigerator and its light bulb

[wildanpradana]

The interior lighting of the refrigerators is provided by
incandescent lamps whose switches are actuated by the opening of the
refrigerator door. Consider a refrigerator whose 30-W lightbulb
remains on continuously as a result of a malfunction of the switch. If
the refrigerator has a COP of 1.4 and the cost of electricity is Rp
1200/kWh, determine the increase in the energy consumption of the
refrigerator and its cost per month (1 month = 30 days) if the switch
is not fixed. Assuming the refrigerator is opened 50 times a day for
an average of 30 s.




COP= QL/(QH-QL)
COP= Qin/Win



Please help me for this. thanks a lot!

 

[Andrew Mason]

The interior lighting of the refrigerators is provided by
incandescent lamps whose switches are actuated by the opening of the
refrigerator door. Consider a refrigerator whose 30-W lightbulb
remains on continuously as a result of a malfunction of the switch. If
the refrigerator has a COP of 1.4 and the cost of electricity is Rp
1200/kWh, determine the increase in the energy consumption of the
refrigerator and its cost per month (1 month = 30 days) if the switch
is not fixed. Assuming the refrigerator is opened 50 times a day for
an average of 30 s.




COP= QL/(QH-QL)
COP= Qin/Win

You will have to show us your thoughts on this. To start, what is the rate of work that the refrigerator motor has to do to remove 30 W of heat?

AM

 

[Adjuster]

When you've worked out the energy required for the refrigerator to pump out the heat, don't forget to add the original 30W of electricity consumed by the bulb to the total. It's all got to be paid for!