KNOWN: Number and power dissipation of PCBs in a computer console. Convection coefficient
associated with heat transfer from individual components in a board. Inlet temperature of cooling air
and fan power requirement. Maximum allowable tempe
KNOWN: Hot formed paper egg carton of prescribed mass, surface area, and water content exposed
to infrared heater providing known radiant flux.
FIND: Whether water content can be reduced by 10% of the total mass during the 18s period carton
KNOWN: Silicon wafer, radiantly heated by lamps, experiencing an annealing process with known
FIND: Whether temperature difference across the wafer thickness is less than 2C in order to avoid
damaging the wafer.
KNOWN: Speed, width, thickness and initial and final temperatures of 304 stainless steel in an
annealing process. Dimensions of annealing oven and temperature, emissivity and convection
coefficient of surfaces exposed to ambient air and large
KNOWN: Power consumption, diameter, and inlet and discharge temperatures of a hair dryer.
FIND: (a) Volumetric flow rate and discharge velocity of heated air, (b) Heat loss from case.
ASSUMPTIONS: (1) Steady-state, (2) Constant air