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1. Determine the net electric power produced by the fuel cell-fan system, Pnet = P - Pf .
2. Consider the effect of attaching an aluminum (k = 200 W/m · K) finned heat sink, of identical top and bottom sections, onto the fuel cell body. The contact joint has a thermal resistance of R"t,c = 10-3 m2 · K/W, and the base of the heat sink is of thickness tb = 2 mm. Each of the N rectangular fins is of lengthLf = 8 mm and thickness tf = 1 mm, and spans the entire length of the fuel cell, Lc = 50 mm. With the heat sink in place, radiation losses are negligible and the convective heat transfer coef- ficient may be related to the size and geometry of a typical air channel by an expression of the form h = 1.78 kair (Lf +a)/(Lf · a), where a is the distance between fins. Draw an equivalent thermal circuit for part 2 and determine the total number of fins needed to reduce the fan power consumption to half of the value found in part 1.
a closed and rigid tank with 1.5 m3 volume initially contains saturated vapor refrigerant 134a at 50deg c. the system
a car with a mass of 1570 kg is supported by four springs each with a spring constant of 25 nmm. in traveling over an
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Assuming ideal flow, use the method of separation of variables in polar coordinates to find the stream function for uniform flow at speed U? over a circular cylinder of radius R. At what points on the cylinder is the fluid speed exactly equal to the ..
Collar C moves along rod BA with a velocity of 3 m/s and an acceleration of .5 m/s^2 both directed from B towards A and measured relative to the the rod. At the same instant, rod AB rotates with the angular velocity and angular acceleration shown. De..
How we say that motion of the follower is simple harmonic motion describe in practical approch
Find the magnitude of the angular momentum of the second hand on a clock about an axis through the center of the clock face. The clock hand has a length of 15.0 cm and a mass of 6.00 g.
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water pressure of 10 kpa is pumped to a pressure of 4mpa. what is minimum energy requirement of the pump in kjkg.
a simple ideal rankine cycle which uses water as the working fluid operates it condenser at 40 degrees celsius and its
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