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A thick oak wall, initially at 25°C, is suddenly exposed to combustion products for which T∞ = 800°C and h = 20 W/m2 · K.
(a) Determine the time of exposure required for the surface to reach the ignition temperature of 400 C.
(b) Plot the temperature distribution T(x) in the medium at t = 325 s. The distribution should extend to a location for which T ≈ 25°C.
A refrigeration system is to cool bread loaves with an average mass of 450 g from 22 to -10°C at a rate of 500 loaves per hour by refrigerated air at -30°C. Taking the average specific and latent heats of bread to be 2.93 kJ/kg · °C and 109.3 kJ/k..
Explore the effect of the insulation thickness on the temperature of the aluminum and the heat loss per unit tube length
saturated liquid water at 25 degrees c is pumped to a pressure of 5 mpa in an isothermal process. the specific work
Consider two shafts in torsion, each of the same material, length, and crosssectional area. One shaft has a solid square cross section and the other shaft has a solid circular section. Which shaft has the greater maximum shear stress and by what ..
calculate normalised values of the mid-point values. Compare these to normalised end-point values and discuss why there may be differences. Use European and Worldwide values.
Air is expanded from 1.5MPa and 177°C to 90kPa in an adiabatic turbine. Determine the isentropic efficiency of this turbine if the air is exhausted at 0°C
The static design yields a mass of 50 kg and that the bar be made of steel of length 0.25 m with a cross sectional area of 0.01 m2 . Compute the system's natural frequency
According to data provided by Motor Trend, the 2011 Chevrolet Silverado Diesel HD is powered by an 8 cylinder diesel engine having a total displacement of 6599 cc (6.599 L). The compression ratio is 16:1, and the total power output is 397 hp (296.0 k..
Using the SLR method, calculate the auxiliary energy required in March for a 2000 ft2, NLC 12,000 Btu/F-day house in Boston with a 150 ft2, night-insulated double-glazed direct gain system with 6 in thick storage floors of 45 Btu/ft2 F capacity.
Water initially exists as a saturated liquid at 186oC is contained in a piston-cylinder assembly. The water undergoes a process to the corresponding saturated vapor state, during which the piston moves freely in the cylinder
a sled is traveling down a curve which can be approxmiated by a parabola y .01x2. find the magnitdue of the
agas turbine plant operates on the regenerative brayton cycle with two stages of reheating and two stages of
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