Fundamentals Is the unit kWh a unit of ENERGY or a unit of POWER? Convert the un
ID: 1843822 • Letter: F
Question
Fundamentals Is the unit kWh a unit of ENERGY or a unit of POWER? Convert the unit kW-hr (also written as kWh) to kJ. What is the purpose of a power cycle? What is the purpose of a refrigerator? What is the purpose of a heat pump? Why are the expressions that characterize power cycle efficiency eta and coefficient of performance beta different? What range of values are possible for efficiency eta? Why does this same limit not apply to coefficient of performance beta or gamma? For a power cycle, what is the energy transfer that you have to pay for? For a refrigerator/heat pump, what is the energy transfer that you have to pay for? For a home powered by a heat pump vs. an electric heater, what energy transfer value will be the same for both? For each of the discussed cycles (power cycle, refrigerator, heat pump), list the energy flow that you have to pay for. and the energy flow that is desired.Explanation / Answer
a) kWhr is unit of energy but kW is unit of power
b) 1kWhr=3600kJ
c) the pupose of power cycle is to produce work from heat input
d) the pupose of refrigerator is to keep a body at low temperature by transferring heat from low temperature body to high temperature body by using work input
e) the pupose of heat pump is to keep a body at high temperature by transferring heat from low temperature body to high temperature body by using work input
f) efficiency = work done /heat input coeff of performance (refrigerator) = refrigerating effect/ work input = heat taken away from low temp body / work input
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