Q: A desktop computer is to be cooled by a fan. The
A desktop computer is to be cooled by a fan. The electronic components of the computer consume 80 W of power under full-load conditions. The computer is to operate in environments at temperatures up t...
See AnswerQ: Water at 43.3°C flows over a large plate
Water at 43.3°C flows over a large plate at a velocity of 30.0 cm/s. The plate is 1.0 m long (in the flow direction), and its surface is maintained at a uniform temperature of 10.0°C. Calculate the st...
See AnswerQ: Hot carbon dioxide exhaust gas at 1 atm is being cooled by
Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. The gas at 220°C flows in parallel over the upper and lower surfaces of a 1.5-m-long flat plate at a velocity of 3 m/s. If the f...
See AnswerQ: Hot engine oil at 150°C is flowing in parallel over
Hot engine oil at 150°C is flowing in parallel over a flat plate at a velocity of 2 m/s. Surface temperature of the 0.5-m-long flat plate is constant at 50°C. Determine (a) the local convection heat t...
See AnswerQ: Consider a TV set that consumes 120 W of electric power when
Consider a TV set that consumes 120 W of electric power when it is on and is kept on for an average of 6 h per day. For a unit electricity cost of 12 cents per kWh, determine the cost of electricity t...
See AnswerQ: Parallel plates form a solar collector that covers a roof, as
Parallel plates form a solar collector that covers a roof, as shown in the figure. The plates are maintained at 15°C, while ambient air at 10°C flows over the roof with V = 2 m/s...
See AnswerQ: Hydrogen gas at 1 atm is flowing in parallel over the upper
Hydrogen gas at 1 atm is flowing in parallel over the upper and lower surfaces of a 3-m-long flat plate at a velocity of 2.5 m/s. The gas temperature is 120°C, and the surface temperature of the plate...
See AnswerQ: An array of power transistors, dissipating 5 W of power each
An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm × 25-cm square aluminum plate and blowing air at 35°C over the plate...
See AnswerQ: What is external forced convection? How does it differ from internal
What is external forced convection? How does it differ from internal forced convection? Can a heat transfer system involve both internal and external convection at the same time? Give an example.
See AnswerQ: Repeat Prob. 19–19 for a location at an elevation
Repeat Prob. 19–19 for a location at an elevation of 1610 m where the atmospheric pressure is 83.4 kPa. Data from Prob. 19-19: An array of power transistors, dissipating 5 W of pow...
See Answer
