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A 1cm x 2cm semiconductor dissipates 5W and is mounted on a 2cm square, 2mm thick aluminum plate. An 0.1mm thick diamond wafer acts as a heat spreader. the underside of the plate is fitted with ten 15mm long 0.2mm thick rectangular aluminum fins at a pitch of 2 mm. Cooling air at 25C flows through the fins arrant creating a heat transfer of 28W/m^2 K. using 175W/mk for the thermal conductivity of aluminum, estimate the temperature of the base of the semiconductor.
in a rigid chamber 30 lbm of helium is heated from 60 degrees farenhight and 30 psig to 90 degrees farenhight. if
(a) Determine the blade angles at leading and trailing edges of both the rotor and stator at the mean radii, (b) Calculate the mass flow rate and the power required for each stage.
long metallic rods of circular cross section are heat treated by passing an electric current through the rods to
the low-temperature reservoir of a carnot heat engine is at 10 c. to increase the efficiency of this heat engine from
an ideal cold air-standard brayton cycle engine operates with air entering the compressor at 27 c. the pressure ratio
an al cube 0.1m on each side is initially at a temp of 300 c. the cube is immersed in a fluid at 100 c. calculate 1.
an insualed piston-cylinder device contains 5 kg of satured mix of water initially at 100kpa and 6m3. now 3917kj of
q1. 1.5 kg of oxygen n2 and 0.15 kg of helium he2 are separated by a partition in a vessel.nbsp the nitrogen is at 5
a 1.4 kg aluminum household iron has 500 watt heating element. the surface area is 0.046 m2. the ambient temperatures
at t0 bullet a is fired vertically with an initial velocity of 450 ms. after 3 seconds bullet b is fired upward with an
write a cubloc basic program use basic language to read in four switches connected to ports 323334 and 35 into a byte
A two capacity process tank is to be analyzed using proportional and integral controllers. A process could be a steam jacketed kettle as shown in Figure.1.Water is heated continuously by the steam flow and it is proposed to use a controller to regula..
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