Test_I_Sp_04 - Test I Howell 1(33 a Ammonia is at a...

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Test I: February 25, 2004, Howell 1 (33%) a): Ammonia is at a pressure of 200 kPa, and has a specific volume of 0.5000 m 3 /kg. What is the value of specific internal energy u of the refrigerant at this state (kJ/kg)? Using values from Table 18s, and b): Ammonia is at a temperature of 25 o F and pressure of 250 psia. What is the specific internal energy u of the ammonia at this state (Btu/lbm)? From Table 17e, find that at T=25 o F, P>P SAT (25 o F), so this state is a subcooled liquid. Therefore, u(T,P)=u L (T SAT =T=25 o F)=71.1 (Btu/lbm). c): What is the specific enthalpy of ammonia h (Btu/lbm) at the state given in part (b) above? For a subcooled liquid, Values again from Table 17e. 2 (33%) A piston-cylinder system contains 5 lbm of refrigerant R-134a. The piston is originally 2 ft above the bottom of the cylinder. The piston has a face area of 1 ft 2 . The piston has a mass of 763.2 lbm, and atmospheric pressure is 14.7 psia. A process occurs that causes the piston to travel 14 feet above its original position.
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a) Sketch a P-v diagram of the process, showing the saturation dome.
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