A heat pump and a refrigerator are operating between the same two thermal reservoirs. Which one has a higher COP?
1 answer:
Answer:
Heat pump
Explanation:
COP:
As we know that COP can be defines as the ratio of desired effect to the work in put.
The desired effect can be different for heat pump our desired effect to heat the space and for refrigeration our desired effect is cooled the space.
So
When heat pump and refrigerator are operating with same temperature limits then from expression we can say that
COP of heat pump = 1 + COP of refrigeration.
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Answer:
minimum length of a surface crack is 15.043 mm
Explanation:
given data
strain fracture toughness K = 78 MPa
tensile stress = 345 MPa
Y = 1.04
to find out
minimum length of a surface crack
solution
we find here length of critical interior flaw from formula that is
α = ....................1
put here value we get
α =
α = 15.043 mm
so minimum length of a surface crack is 15.043 mm