Recent content by Achievementhunt

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    Energy consumption of Fridge with faulty light

    Thanks for your help, appreciate it
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    Energy consumption of Fridge with faulty light

    I can redefine COP as COP= heat to be extracted (Qc)/ Electrical work to operate compressor. We have found the additional heat under faulty conditions, therefor the additional work is Additional heat/COP. This makes sense to me, is this the correct approach?
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    Energy consumption of Fridge with faulty light

    So an additional 20J/s needs to be extracted from the fridge to keep it cool, reducing the COP?
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    Energy consumption of Fridge with faulty light

    When the door is closed, the fridge is a closed system, light cannot escape so the entire electrical power consumed by the bulb eventually becomes the additional thermal energy of the fridge, 20 J/s
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    Energy consumption of Fridge with faulty light

    Thanks for the reply but I am unsure how to calculate the part thermal energy given to the fridge from the light of the bulb
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    Energy consumption of Fridge with faulty light

    1. Homework Statement Coefficient of performance of a refrigerator is 1.4 A faulty 20w bulb remains on when the fridge is closed. Under normal circumstances, the bulb turns on when the fridge is open. The door is opened 20 times a day for 30 seconds. Calculate the increase in energy...
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    Power required to rotate a disc in a fluid

    Thanks for the hint Chet. I will give Pi theorem a try
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    Power required to rotate a disc in a fluid

    Homework Statement This is an optional question given to Fluid mechanic students to work on for leisure. P = power ρ = fluid density, rho ω= angular velocity omega μ= dynamic viscosity, mu D= diameter Homework Equations Show the that the power required to rotate the disc is given by...