A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the refrigerator in order to remove 250 J of heat from the interior?
A)
60 J
B)
120 J
C)
250 J
D)
480 J
E)
1050 J
A
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Determine the temperature at the four nodes shown in the sketch. Assume steady conditions and two-dimensional heat conduction. The four faces of the square shape are each at different temperatures as shown.
GIVEN
Square shape with four different face temperatures
FIND
Temperature at four interior nodes
SKETCH
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