Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 3, Problem 3.10P
A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is
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Q2/ A 4-m-internal-diameter spherical tank made of 1.75-cm-thick
stainless steel (k 15 W/m °C) is used to store iced water at 0°C. The
tank is located in a room whose temperature is 35°C. The walls of the
room are also at 35°C. The outer surface of the tank is black, and heat
transfer between the outer surface of the tank and the surroundings is by
natural convection and radiation. The convection heat transfer
coefficients at the inner and the outer surfaces of the tank are 80 W/m2
°C and 10 W/m2· °C, respectively. Determine (a) the rate of heat
transfer to the iced water in the tank and (b) the amount of ice at 0°C
that melts during a l-h period. The heat of fusion of water at
atmospheric pressure is hif 334 kJ/kg.
Ground turkey was made
into me
at balls and refrigerated at 2
°
C before being deep fried. The
diameter of each meat ball is 9cm. To make sure that the meat balls are safe to be consumed,
they must be cooked over 70
°
C. Assume that the cooking oil is at a constant temperature of 180
°
C and has a heat transfer coefficient of 50
W/(m
2
∙
K). The conductivity and specific heat of the
ground turkey are approximated at 2 W/(
m∙K
) and 4 kJ/(
kg
∙
K)
respectively. The density of the
ground turkey is 500kg/
m
3
.
a)
During the deep-
frying process, do you anticipate that each meat ball has
a uniform
temperature distribution throughout its volume? Please show
calculation
to support your
answer
(5
pts)
.
b)
Please calculate the minimum time required for cooking
(1
5 p
ts).
c)
When served, what are the surface and center temperatures of each meat ball (
15 pts).
A steam is flowing through a 5.7 m long of steel tube that has inner and outer radii of r, = 0.015 and r, 0,024 m, and a thermal
conductivity of 0.14 W/m.K. The steam and the outer surface of the tube is maintained at constant temperature of 150 °C and the air
= 25 °C, h = 0.35 W/m2.k) is surrounding the tube. To prevent the outer surface of the steel from the environmental conditions, a
material that has a thermal conductivity of 0.014 W/m.k is wrapped over the outer surface of the steel. What is the maximum heat
transfer from the steam to the air (W)?
NOTE: Enter your answer.
Answer
Air
Th
Steam
Steel Tr
111
To
Chapter 3 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 3 - Consider a flat plate or a plane wall with a...Ch. 3 - 3.2 High-strength steel is required for use in...Ch. 3 - Prob. 3.3PCh. 3 - 3.5 In a ball-bearing production facility, steel...Ch. 3 - A 0.6-cm diameter mild steel rod at 38C is...Ch. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - 3.9 The heat transfer coefficients for the flow of...Ch. 3 - 3.10 A spherical shell satellite (3-m-OD,...Ch. 3 - Prob. 3.11P
Ch. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - 3.14 A thin-wall cylindrical vessel (1 m in...Ch. 3 - A thin-wall jacketed tank heated by condensing...Ch. 3 - 3.16 A large, 2.54-cm.-thick copper plate is...Ch. 3 - 3.17 A 1.4-kg aluminum household iron has a 500-W...Ch. 3 -
3.28 A long wooden rod at with a 2.5-cm-OD is...Ch. 3 - A mild-steel cylindrical billet 25 cm in diameter...Ch. 3 - Prob. 3.37PCh. 3 -
3.38 An egg, which for the purposes of this...
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