The human body is a good example of a closed system. Radiation is the only mode

Question

The human body is a good example of a closed system. Radiation is the only mode of heat transfer that can occur in a vacuum. A saturated mixture containing 6 m3 of liquid and 4 m3 of vapor has a quality of 40%. The properties (v, u, h) of a compressed liquid can be approximated as that of a saturated liquid at the same temperature. Air at 2000 K and 15 MPa behaves as an ideal gas. Heat and work are known as path functions, which means that their values depend upon the process path. Pressure and temperature are considered intensive, independent properties for all phases of a pure substance. The phase of R-134a at 20 degree C and 535 kPa is a superheated vapor. Determine the phase and internal energy (u) of R- 134a at 30 degree C and 1 MPa. A pressure gage connected to a tank reads 150 kPa gage. The atmospheric pressure, as read from a barometer, is 768 mm Hg (mercury). What is the absolute pressure inside the tank? Take rho Hg = 13,600 kg/m3. Complete the following table. Show any calculations below the table in the space provided.

Explanation / Answer

1)

a) False

b) True

c) False

d) True

e) True

f) True

g) True

h) False

3) It will same as read by pressure gage i.e 150 KPa.

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