Provide solution for delta xins . Please explain.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter9: Heat Transfer With Phase Change
Section: Chapter Questions
Problem 9.37P
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Provide solution for delta xins . Please explain.

Qcanyo
Qandi
condz
Roonvi Ronda
Rond,
Qoord3
Roands
= Q convocand₁ = (condy = Óconds = conu
:
Rootal Roono + Roond, + Rconda + Roonds + Rconvi
Axins: 4.468 mm
corni
Ranvi
Transcribed Image Text:Qcanyo Qandi condz Roonvi Ronda Rond, Qoord3 Roands = Q convocand₁ = (condy = Óconds = conu : Rootal Roono + Roond, + Rconda + Roonds + Rconvi Axins: 4.468 mm corni Ranvi
The wall of a refrigerator is constructed of fiberglass insulation (k = 0.035 W/m - K) sandwiched
between two layers of 1-mm thick sheet metal (k = 15.1 W/mK). The refrigerated space is
maintained at 3°C, and the average heat transfer coefficients at the inner and outer surfaces of the wall
are 4 W/m² K and 9 W/m².K, respectively. The kitchen temperature averages 25°C. It is observed
that condensation occurs on the outer surfaces of the refrigerator when the temperature of the outer
surface drops to 20°C. Determine the minimum thickness of fiberglass insulation that needs to be used
in the wall to avoid condensation on the outer surfaces.
Find: Oxins
ho= q Wik
Kitchen
air 25°C
Tooo
Tso = 20°C.
Axmotal: 1 mm
Sheet metal
Insulation
Kins= 0.025
L
Oxins
hi: 4
Refrigerated
space
W
mk
W
m²K
3°C : Tooi
Axmetal
kmetal = 15.1 W
mm
cahyo
Qandi
cond₂
Roonvi Randz
Roond,
Qoord3
Rounds
conti
Transcribed Image Text:The wall of a refrigerator is constructed of fiberglass insulation (k = 0.035 W/m - K) sandwiched between two layers of 1-mm thick sheet metal (k = 15.1 W/mK). The refrigerated space is maintained at 3°C, and the average heat transfer coefficients at the inner and outer surfaces of the wall are 4 W/m² K and 9 W/m².K, respectively. The kitchen temperature averages 25°C. It is observed that condensation occurs on the outer surfaces of the refrigerator when the temperature of the outer surface drops to 20°C. Determine the minimum thickness of fiberglass insulation that needs to be used in the wall to avoid condensation on the outer surfaces. Find: Oxins ho= q Wik Kitchen air 25°C Tooo Tso = 20°C. Axmotal: 1 mm Sheet metal Insulation Kins= 0.025 L Oxins hi: 4 Refrigerated space W mk W m²K 3°C : Tooi Axmetal kmetal = 15.1 W mm cahyo Qandi cond₂ Roonvi Randz Roond, Qoord3 Rounds conti
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