(a) What is the best coefficient of performance for a refrigerator that cools an environment at – 3 0.0 ° C and has heat transfer to another environment at 45 .0 ° C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 × 10 6 J (a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at – 3 0.0 ° C and has heat transfer to another environment at 45 .0 ° C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 × 10 6 J (a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at
–
3
0.0
°
C
and has heat transfer to another environment at
45
.0
°
C
? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per
3.60
×
10
6
J
(a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at −30.0ºC and has heat transfer to another environment at 45.0ºC ? (b) How much work in joules must be done for a heat transfer of 4186kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60×106 J (a kilowatthour)?(d) How many kJ of heat transfer occurs into the warm environment?(e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at -30.0C and has heat transfer to another environment at 45.0C? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 X 106 J (a kilowatt-hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
An electrical power station uses 1.58 x 10-4 J of heat input with an efficiency of 35.7%.
(a) How much work is done?
(b) How much waste heat is produced by the station?
(c) What is the ratio of waste heat to work output?
waste heat
work output
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The Second Law of Thermodynamics: Heat Flow, Entropy, and Microstates; Author: Professor Dave Explains;https://www.youtube.com/watch?v=MrwW4w2nAMc;License: Standard YouTube License, CC-BY