When we calculate the overall heat transfer coefficient U= ( frac{X ho}{X+ho} ), what is the value X?

hoi, heat transfer coefficient for annulus for inner side

hi, heat transfer coefficient for inner tube for inner side

hio, heat transfer coefficient for inner tube for outer side

hoi, heat transfer coefficient for annulus for inner side

ho, heat transfer coefficient for annulus side

When we calculate the overall heat transfer coefficient U= ( frac{X h

1.	When we calculate the overall heat transfer coefficient U= ( frac{X ho}{X+ho} ), what is the value X?
A.	hi, heat transfer coefficient for inner tube for inner side
B.	hio, heat transfer coefficient for inner tube for outer side
C.	hoi, heat transfer coefficient for annulus for inner side
D.	ho, heat transfer coefficient for annulus side
Answer» C. hoi, heat transfer coefficient for annulus for inner side

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When we calculate the overall heat transfer coefficient U= ( frac{X ho}{X+ho} ), what is the value X?

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