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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.
steam enters a urbine at 25 mpa 550c and exits at 5 mpa 325c at a flow rate of 70 kgs. determine the total power output
A steel tube [k = 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k = 0.2 W/(m.°C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.°C) flows inside the tube. Th..
Ideal vapor-compression refrigeration cycle, An ideal vapor-compression refrigeration cycle, with ammonia as the working fluid, has an evaporator temperature of -20c and a condenser pressure of 12 bar
the diameter of a round wire is d in mm. put d 3.00 mm using d 3.00mm and calculate the following calculate the cross
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sketch a preliminary layout for the following heat exchanger systems. on the layout sketch indicate pipe work manifolds
the pressure in the vein is known as 1850 Pa. what force must be applied to the plunger, so that 1.5 x 10^-6 m^3 of solution can be injected in 5.0 s?
reinforced concrete highway pavement has a depth of 250 mm with 24 mm diameter steel rebars located 180 mm from the
the snowmobile is traveling at 10m/s when it leaves the embankment at A.determine the speed at which it strikes the ground at B and its maximum acceleration along the trajectory AB.
sketch the ttt diagram for a typical high hardenability fefe3c alloy with addition elements such as ni mn n etc. in
an electric wire made of c14500 copper is stretched between two street supports at 20degc so that a stress of 40 mpa is
water flows near a flat surface and soe measurments of the water velocity u parallel to the surface at different
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