• Card 11 / 35: A refrigeration system with a COP of 3.5 is used to make ice from water at 0°C at a rate of 1000 lbs per day. What is the minimum power required by the refrigerator?
    A) 100 W
    B) 200 W
    C) 1000 W
    D) 500 W
    E) 5000 W

    Answer:
    D) 500 W

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Explanation:

The first bit of information we need for this question is the DHfusion of water at 1 atm and 0°C; this is not a number that you need memorize, rather you may find it easily in many references under "heat of fusion of water." DHfusion= 334 kJ/kg. Next, we need the definition of the Coefficient of Performance for a refrigeration system; COP = Q/W, where Q is the heat removed and W is the work expended; you should familiarize yourself with this definition. So for this question, W = Q/COP = 1000 lb/day (1 day/24 hours) (1 hour /3600 sec) (1 kg/2.24 lb)(334 kJ/kg) (1/3.5) = 493 W.

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Thermal-Fluid Systems ME303

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Attribution:  Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/
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