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1. Refrigerant 134a as saturated vapor at 210°C enters a compressor operating at steady state with a mass flow rate of 0.3 kg/s. At the compressor exit the pressure of the refrigerant is 5 bar. Stray heat transfer and the effects of motion and gravity can be ignored. If the rate of exergy destruction within the compressor must be kept less than 2.4 kW, determine the allowed ranges for (a) the power required by the compressor, in kW, and (b) the exergetic compressor efficiency. Let T0 5 298 K, p0 5 1 bar.
2. For the turbine-compressor arrangement of Problem 6.164, determine the exergetic efficiency for (a) the turbine, (b) the compressor, (c) an overall control volume enclosing the turbine and compressor. Let T0 5 300 K.
water is contained in a pistoncylinder at 200 kpa 200degc and a volume of 20 l. the piston moves slowly compressing
The problem belongs to Mechanical Engineering and the problem is about ice-hockey puck being struck with the hockey stick. The average magnitude of force exerted by stick on the puck and the direction and the angle of the puck needs to be calculat..
a pressure gage connected to a tank of oxygen reads 50 psi and the temperature of the oxygen is 80degf. if the local
The equation of state of a gas is given as bar v(P+10/bar v^2) = RsubuT, where the units of bar v and P are m^3/kmol and kPa respectively. Now 0.2 kmol of this gas is expanded in a quasi-equilibrium manner from 2 to 4 m^3 at a constant temperature of..
1. An aluminum bar 125 mm (5.0 in.) long and having a square cross section 16.5 mm (0.65 in.) on an edge is pulled in tension with a load of 66,700 N (15,000 lbf), and experiences an elongation of 0.43 mm (1.7 X 10-2 in.). Assuming that the defo..
Assuming that within metal crystals, the atoms can be considered as hard spheres in contact, sketch arrangement of atoms in a (100) plane, a (110) plane and a (111) plane of face-centered cubic structure. Determine the number of atoms contained wi..
the mean solar flux at the earths surface is 2.00 jcm-2min-1. in a nonfocusing solar collector the temperature can
A collar (A) that slides along a smooth horizontal bar. The mass of the collar is 14 kg, and the mass of block (B) is 18 kg. The spring constant for the spring connecting the collar to the frame is 700 N/m.
two perfectely black squares 10 ft x 10 ft are spaced 20 feet apart. what is the net rate of heat exchange between them
the 50-kg flywheel has a radius of gyration about its center of mass of ko 250 mm. it rotates with a constant angular
suppose that two plates thickness t0.027 m and area a1.2 m2 for each plate are mated together. the thermal conductivity
a flat plate solar collector 6 ft by 12 ft is mounted on the roof of a house. the outer surface of the collector is at
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