Question
In: Mechanical Engineering
Heat transfer question A shell-and-tube heat exchanger is used to heat a liquid that flows in...
Heat transfer question
A shell-and-tube heat exchanger is used to heat a liquid that
flows in tubes of inside and outside diameters Di=10 mm and Do=11
mm. You have been asked to choose the most cost-efficient material
for the tubes. Material A has a density ρA=8900 kg/m3
and a thermal conductivity kA= 10 W/m·K. Material B has a density
ρB=1780 kg/m3 and a thermal conductivity kB=0.17 W/m·K.
The cost of material A per unit mass is three times the cost of
material B. Determine which is most cost-efficient by:
a) Calculating the ratio of material B to material A surface area
needed for the same heat transfer rate.
b) Determining the ratio of the mass of material B to material
A.
c) Finding the cost ratio of the mass of material B to material
A.
The inner and outer heat transfer coefficients are hi= 1000
W/m2-K and ho=200 W/m2-K, respectively.
1. Find the inside convective resistance, in K·m/W.
Solutions
samet mamat answered 2 months agoRelated Solutions
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