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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.
An airplane flying at 185 kts with heading 320? Towards a target 300 nmi (nautical miles) away, experiences a steady wind of 23 kts from 020? If the time, without wind, to fly to the target was t.
The DNA has N links; each link has a state in which it is closed with energy 0, and a state in which it is open with energy 'e'. The DNA can only unwind from the left; in other words, the sth link can open if all the links to the left (1, 2, 3,..
Construct the homogeneous solution in terms of four constant that could be determined from initial conditions and show the equations of motion
If the peak pressure and peak temperature of the cycle are 4.8 MPa and 2500, determine the net work done per cycle (kJ/kg) and the cycle thermal efficiency .
1. a hydro-electric plant is used to convert the potential energy of the water behind the dam into electricity. the
A Car Costs 25,000 dollars. You can buy it for cash for 21000 (right now) or buy it over time with a down payment of 8000 dollars and pay the remaining 17000 over 72 months at 12% interest compounded monthly.
Initially open and at rest,the door is struck at its center by a handfuIof sticky mud w ith mass O.5 kg, travelling perpendicular to the door at 12.0 m/s just before impact. Find the final angular speed of the door.
a mixture of methanol and water is to be separated in a flash drum operating at a pressure of 1atm. the feed rate is 25
one structure is made from a si3n4 plate which has a plane strain fracture toughness of 3.6 and is alternatively loaded
.How does data screening differ from data cleaning?
a cantilever beam member made from steel with hollow circular cross section experiences an axial load of 300 kn f1 and
This activity will involve researching a concept or component related to the turbine engine lubrication system. The concept can be on the different types of synthetic oils used in turbine engines or an explanation of oil analysis. It can be on a c..
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