Test_I_Sp_04

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

This preview shows pages 1–3. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
a) Sketch a P-v diagram of the process, showing the saturation dome.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern