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Thermodynamics: Vapor-compression refrigeration

  1. Apr 23, 2012 #1
    The refrigerator at a house is driven by a vapor-compression refrigeration cycle shown in figure 6-19 in the textbook. Assume the refrigeration cycle is used to keep the interior of the refrigerator at -5oC at all times. When the kitchen’s temperature is 32oC, the refrigerator is estimated to be gaining heat at a rate of 30 MJ/h.

    (a) The minimum electrical power to run this refrigerator in kW.
    (b) The rate of heat rejected from the refrigerator to the kitchen in kW assuming the same power consumption in part (a).

    I attempted solving it using the formula for a refrigeration cycle,
    Wnet,in= QH-QL
    However, i am not sure how to include the minimum electrical power. I don't understand that part.
     
  2. jcsd
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