A 15-cm-diameter aluminum ball is to be heated form 80 ∘ C and to an average temperature of 200 ∘ C . and Taking the average density and specific heat of aluminum in this temperature range to be p = 2700 k g / m 3 and c p = 0.90 kj/kg .K, respectively, determine the amount of energy that needs to be transferred to the aluminum ball.
A 15-cm-diameter aluminum ball is to be heated form 80 ∘ C and to an average temperature of 200 ∘ C . and Taking the average density and specific heat of aluminum in this temperature range to be p = 2700 k g / m 3 and c p = 0.90 kj/kg .K, respectively, determine the amount of energy that needs to be transferred to the aluminum ball.
A 15-cm-diameter aluminum ball is to be heated form
80
∘
C
and to an average temperature of
200
∘
C
.
and Taking the average density and specific heat of aluminum in this temperature range to be
p
=
2700
k
g
/
m
3
and
c
p
=
0.90
kj/kg
.K,
respectively, determine the amount of energy that needs to be transferred to the aluminum ball.
A long roll of 2-m-wide and 0.5-cm-thick 1-Mn manganesesteel plate (ρ = 7854 kg/m3 and cp = 0.434 kJ/kg·°C)coming off a furnace at 820°C is to be quenched in an oil bathat 45°C to a temperature of 51.1°C. If the metal sheet is movingat a steady velocity of 10 m/min, determine the requiredrate of heat removal from the oil to keep its temperature constantat 45°C.
THERMOFLUID
A 4-in X 5-m X 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10.000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 20°C, Assume constant specific heats at room temperature.
A student living in a 4-m x 6-m x 6-m dormitory room turns on her 150-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 10 h later. Use specific heat values at room temperature, and assume the room to be at 100 kPa and 15°C in the morning when she leaves.
Chapter 1 Solutions
Package: Loose Leaf for Heat and Mass Transfer: Funamentals & Applications with 1 Semester Connect Access Card
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