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The gasoline engine on a hay bailer has rectangular fins for cooling. The outer part of the engine is kept at 140 F = 60 C, while the surrounding air has T = 20 C. The fins are thin, are made of ordinary 1.5% carbon steel, have a thickness t = 1/16" = 1.59 mm, a width of w = 1.0 cm, and a length L = 4.0 cm. The fins operate in an environment that gives a heat transfer coefficient of h = 18.7 W/m2-K. How many fins are required to remove 5.0 hp = 3.68 kW of waste heat? Also calculate the efficiency of the fins. Number of fins = __________? Efficiency = _________?
use entropy balance for a closed system to determine whether the entropy change of the following processes is positive
steam enters one inlet of an adiabatic mixing chamber at 1.4mpa and 300 c. at the second inlet steam enters at 1.4mpa
a long rod is exposed at air at 298oc. it is heated at one end. a steady state condition the temp at 2points along the
If an elevator starting from rest accelerates at 10 m/s^2 and then decelerates at -1 m/s^2 until it reaches the top floor at 100m, calculate the shortest time it takes for it to reach the top floor (ignore gravitational acceleration, assume g=0). plo..
air at 5 bar and 177oc state 1 is expanded through a turbine to 1 bar and 27oc state2. the mass flow rate of air
Compute and plot the tube surface temperature as a function of heat flux for 0.25 qs"/q"max 0.90. On the same graph, plot the corresponding num- ber of tubes needed to provide the prescribed vapor production rate.
the block is subjected to a compressive force of 2kn. determine the average normal and average shear stress developed
1.Determine the impulse exerted on the plate of Prob. 18.31 during the impact by
Calcium oxide (CaO) is formed by decomposing limestone (pure CaCO3). In one kiln the reaction goes to 70% completion. What is the composition (by mass) of the solid product (CaO) withdrawn from the kiln? (Hint: there will be two separate product s..
What is the nozzle-exit-to-throat area ratio for case (a)? The gross thrust is the contribution to engine thrust made by the exhaust nozzle only.
air enters a compressor operating at steady state with a pressure of 1 bar a temperature of 20degc and a volumetric
Determine an equation for the efficiency of the gear train in terms of the load (torque) on shaft 2 (all other factors remaining constant).
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