A real refrigerator works between two temperature reservoirs, one at 277 Kelvin, and one at 345...
A real refrigerator works between two temperature
reservoirs, one at 277 Kelvin, and one at 345 Kelvin. In order to
maintain a constant heat flow, during one cycle 350 Joules of heat
is transferred from the cold reservoir, while the net work in one
cycle is 500 Joules.
(a) Obtain the coefficient of performance for this
refrigerator.
(b) Compare the result in (a) with the ideal case. That is, what is
the maximum coefficient of performance if this was an ideal
refrigerator.
please help asap thanks!
Homework Answers
Tc = 277 K , Th = 345 K, Qc = 350 J . W = 500 J
a) coefficient of performance for refrigerator is
COP = Qc/W = 350 /500
COP = 0.7
b) In ideal case
COP = Tc/(Th -Tc )
= 277/(345-277)
Maximum COP =4.07
COP of refrigerator is less than COP in ideal case.
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