Refrigerator and its light bulb

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SUMMARY

The discussion focuses on the energy consumption and cost implications of a malfunctioning refrigerator light bulb, specifically a 30-W incandescent lamp that remains on continuously due to a faulty switch. With a Coefficient of Performance (COP) of 1.4 and an electricity cost of Rp 1200/kWh, the increase in energy consumption and monthly cost must be calculated based on the refrigerator being opened 50 times a day for an average of 30 seconds each time. The calculations involve determining the total energy required to maintain the refrigerator's operation alongside the continuous power draw from the light bulb.

PREREQUISITES
  • Understanding of Coefficient of Performance (COP) in refrigeration
  • Basic knowledge of electrical power consumption calculations
  • Familiarity with energy cost calculations in kWh
  • Ability to perform unit conversions and time-based energy calculations
NEXT STEPS
  • Calculate the total energy consumption of a refrigerator with a malfunctioning light bulb
  • Research the implications of continuous power draw on appliance efficiency
  • Learn about the impact of COP on energy usage in refrigeration systems
  • Explore methods for troubleshooting and repairing refrigerator light switches
USEFUL FOR

Electrical engineers, appliance repair technicians, energy efficiency analysts, and anyone interested in optimizing refrigerator energy consumption and understanding the cost implications of appliance malfunctions.

wildanpradana
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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!
 
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wildanpradana said:
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
 
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!
 
Last edited:

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