1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -26° C and has heat transfer to another environment at 49 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x106J (a kilowatt-hour)? Cost in cents =
1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -26° C and has heat transfer to another environment at 49 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x106J (a kilowatt-hour)? Cost in cents =
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Transcribed Image Text:1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -26°
C and has heat transfer to another environment at 49 ° C?
COP
ref
(b) How much work must be done for a heat transfer of 4186 kJ from the cold environment?
W =
(c) What is the cost of doing this if the work costs 10.0 cents per 3.6 x 106 J (a kilowatt-hour)?
Cost in cents =
(d) How many kJ of heat transfer, Qh occurs into the warm environment?
Qn
kj
=
Think about what type of refrigerator might operate between these temperatures.
Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.
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