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Air at 300 kPa, 63oC, and a velocity of 423 m/s enters an insulated duct of varying cross-sectional area. The air exits at 150 kPa, 88oC. At the inlet, the cross-sectional area is 6.57 cm2. Assuming the ideal gas model for the air and variable specific heats,
Determine: (a) the exit velocity, in m/s, and (b) the rate of entropy production within the duct, in kW/K if the mass flow rate of air is 0.5 kg/s. (with sketches)
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 20C on a day when the outside temperature is -5C. If electricity costs 8.5 cents per kW*h
Calculate the temperature of the water exiting the absorber tubes. Calculate the rate of exergy transfer accompanying the heat transferred from the absorber tubes to the water. Calculate the amount of exergy destroyed in the absorber tubes.
two lb of water vapor in a piston cylinder assembly is compressed at a constant pressure of of 250 lbfin2 from a volume
A central heating system has a 60 W fan used to circulate air through the building ducts. A previous flow analysis showed that the fan needs to raise the air pressure by 50 Pa to maintain proper flow through the ducts. The fan is located in a horizon..
r-134a is flowed into an insulated 0.2m3 initially container from a line at 500kpa saturated vapor until the flow stops
Calculate the specific removal rate and MRR (Volume of metal removed/sec) of Nickel in a certain electro chemical dissolution process, when a current of 500 A is being passed through the cell. Assume current efficiency = 100%.
Starting from rest the motorboat travels around the circular path,P = 50m , at a speed v=(0.8t)m/s, where t is in seconds. Determine the magnitude of the boat's velocity when it has traveled 40m. Determine the magnitude of the boat's acceleration ..
Calcium Silicate has replaced asbestos as the preferred insulation for steam lines in power plants. Consider a 40 cm O.D., 4 cm wall thickness steel steam line insulated with a 12 cm thickness of calcium silicate. The insulation is protected from dam..
a feeder heater extracts steam from a turbine at 600kpa and 250c which it combines with 0.3 kgs of liquid at 600 kpa
a fire clay brick rho 2000 kgm2 k 1.0 wm-k cp 800 jkg-k of dimensions 5 cm by 10 cm by 15 cm is removed from a kiln
Let A, B, C and D denote four reference frames, composed of mutuality orthogonal unit vectors ai, bi, ci and di (i=1,2,3), respectively. Assume that rotation matrices aRc, aRd and bRd are given. Let x, y, z and t denote some specified constants. Give..
A concentric cylinder viscometer may be formed by rotating the inner member of a pair of closely fitting cylinders (see Figure 1). For small clearances, a linear velocity profile may be assumed in the liquid filling the annular clearance gap. A visco..
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