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An ice skating rink is located in a building where the air is Tair = 20C and the walls are at Tw = 25C. The convection heat transfer coefficient between the ice and the surrounding air is h = 10 W/m^2K. The emissivity of the ice is e = 0.95. the latent heat of fusion of ice is hif = 333.7 kJ/kg and it's density is 920 kg/m^3. Calculate the refrigeration load of the system necessary to maintain the ice at Ts = 0C for an ice rink of 12m by 40m. How long would it take to melt e = 3mm of ice from the surface of the rink if no cooling is supplied and the surface is considered insulated on the back side?
Analyze the given plant for its performance in time and frequency domains (transient response, Routh-Hurwitz test, root locus, Nyquist criterion, Bode plot, Nichols chart).
assume the depth of water in the pvc pipe that you are using for the fish tank reservoir is two inches. a. compute the
Consider a magnet moving in a coil of N, turns. This system can be modelled as mass spring damper system. The damping coefficient consist of both mechanical and electromagnetic damping. How can I calculate the mechanical electromagnetic damping?
a steam turbine has extractions to provide heating steam for the feedwater heaters in a power plant. the following
determine diameter of a circular rod of ductile material with a fatigue strength ,e=280 Mpa. Add a tensile yield strength of 350 Mpa. The member is subjected to a varying axial load from 700 kN to -300kN. Assume Kt=1.8 and factor of safety=2.
a motorist traveling along a straight portion of a highway is decreasing the speed of his automobile at a constant rate
a 6 lb collar is constrained to travel along a frictionless vertical ring of r3 ft. the spring is attached to the
a force of 3 n stretches a spring by 1 m. a mass of 4 kg is attached to the spring. at t0 thenbspmass is pulled down a
5 kg of air initially at 10oc and 100 kpa is in piston-cylinder device. initially the piston is resting on a set of
a 850-kg meteoroid happens to be composed of aluminum. when it is far from the earth its temperature is -13.5 degc and
a desuperheater is a steady-flow adiabatic mixing process that mixes superheated water vapor with colder liquid water
determine the rate of diffusion of cu in al at 300k using d do exp -edrt where do 0.15 cm2sec and ed 125 kjmole.
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