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Consider the electronic elements that are cooled by forced convection in Problem 6.39. The cooling system is designed and tested at sea level (p ≈ 1 atm), but the circuit board is sold to a customer in Mexico City, with an elevation of 2250 m and atmospheric pressure of 76.5 kPa.
(a) Estimate the surface temperature of the chip located 120 mm from the leading edge of the board when the board is operated in Mexico City. The dependence of various thermophysical properties on pressure is noted in Problem 6.22.
(b) It is desirable for the chip operating temperature to be independent of the location of the customer. What air velocity is required for operation in Mexico City if the chip temperature is to be the same as at sea level?
determine the force in members cd and gf of the truss and state if the members are in tension or compresson. also
a tank of propane has capacity of 120 gallons what would the tank be rated in terms of cubic feet cubic meters and
If the initial temperature of the slab was 30°C and the thermocouple measures a temperature of 65°C, 2 min after the surface is brought to 100°C, what is its thermal conductivity?
Show that Bernoulli's equation applied between sections 1 and 2 does not give this result. Derive all expressions for the change in total head across a hydraulic jump.
Refrigerant R134a enters the compressor of a refrigerator at 0.14 MPa and -10°C at a rate of 0.12 kg/s and leaves it at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa and it is throttled to 0.15 MPa.
a pipeline is to be supported above ground on horizontal beams 14ft long. consider each beam to be simply supported at
Calculate real gas pseudopressure at a pressure of 1902.7 psia using the following data and a base pressure of 102.7 psia. Was the calculation of real gas pseudopressure necessary for this gas? Explain your answer.
Compute the Reynolds number for each section if ethylene glycol at 77°F flows with an average velocity of 15 ft/s. Then compute the energy loss over a length of 54 in.
water is the working fluid in an ideal rankine cycle. steam enters the turbine at 1400 lbfin2. the net power output of
Consider a three-point moving-average discrete-time filter described by the difference equation y [ n ) = t{x[ n ) +x [ n - 1) +x [ n - 2]}
a carnot engine operating on air accepts 50 kjkg of heat and rejects 20 kjkg. calculate the high and low reservoir
What will the schedule be if your planning horizon was only six months?
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