MECH 323 Homework #1
Use only Equations, variable symbols, and material properties
from the course textbook to solve the following problems.
1.)
The inner and outer surfaces temperatures of a 1-D slab
of material, with a thickness of 8.20 mm, are 48.0°C and
6.0°C respectively. Determine the heat flux through the
material in units of W/m2 if the material is:
a) Pure Aluminum.
b) Sand.
c) Sulfur.
2.)
You are cooling the door to a large heat treating oven,
which is 3.50 m tall by 1.30 m wide, with a large fan
blowing air at 25.0°C over the outside of the door. The
convection coefficient associated with this cooling
process is h = 57.0 W/(m2-K). The outside surface
temperature of the door is 58.0°C. Find the heat
transfer rate q, in units of Watts, associated with this
cooling process.
3.)
A computer chip inside an orbiting satellite heats up
during operation. Since there is no air in the satellite
the only cooling will be by radiation. The chip is 1.50
cm wide by 2.50 cm long with a negligible thickness; and
assume that the chip radiates heat evenly from both the
top and bottom surfaces. The chip has an emissivity of
0.600; and dissipates 0.410 Watts during usage. Assuming
that the inside temperature of the satellite is held at a
constant -100.0°C; calculate the surface temperature of
the chip in units of Celsius.