Exercise 1

I. Determine the state & properties of the following (Use Steam Tables): 1.) Liquid having a pressure of 913.2 KPa and temperature 176 C.

a. State of the given properties

b. Specific Volume

c. Internal Energy

d. Enthalpy

e. Entropy

2.) Determine the properties of a vapor having a pressure of 14 MPa and temperature 336.75 C.

a. State of the given properties

b. Specific Volume

c. Internal Energy

d. Enthalpy

e. Entropy

3.) Temperature = 250 C and Pressure = 3 MPa

a. State of the given properties

b. Specific Volume

c. Internal Energy

d. Enthalpy

e. Entropy

4.) Pressure = 2.5 MPa and Temperature = 200 C.

a. State of the given properties

b. Specific Volume

c. Internal Energy

d. Enthalpy

e. Entropy

5.) Pressure = 1.2 MPa and Temperature = 265 C.

a. State of the given properties

b. Specific Volume

c. Internal Energy

d. Enthalpy

e. Entropy

6.) Pressure = 12 MPa and Entropy = 4.5 Kj/Kg-C

a. State of the given properties

b. Saturation Temperature

c. Specific Volume

d. Internal Energy

e. Enthalpy

II. Answer the following problem. Draw and label the pV and TS planes.

1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 ft3 and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90oF.

Find (a) QA, (b) QR, (c) V3, (d)

P3, (e) V4, (f) p4, (g) MEP, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression.

2. A Carnot engine operating between 775K and 305K produces 54 kJ of work.

Determine (a) QA, (b) during heat rejection, and (c) e.