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TAREA #1 IQ205 Entregar enero 28 (mircoles), 2015

1. The following table lists temperatures and specific volumes of water vapor at two pressures:

p = 0.1 MPa p = 0.12 MPa T (C) v (m3/kg) T (C) v (m3/kg)

200 2.172 200 1.808

240 2.359 240 1.965

280 2.546 280 2.120

Using the data provided here, estimate:

a .a . The specific volume, in m3/kg, at T = 200C, p = 0.113 Mpa b .b . The temperature, in C, at p = 0.12 Mpa, v = 1.85 m3/kg c .c . The temperature, in K, at p = 0.11 Mpa, v = 2.20 m3/kg

2 .2 . A manometer is attached to a tank of gas in which the pressure is greater than that of the surroundings. The manometer liquid is mercury, with a density of 13.59 g/cm3. The difference in mercury levels in the manometer is 2 cm. The acceleration of gravity is g = 9.81 m/s2. The atmospheric pressure is 93.0 kPa. Calculate in kPa:

a .a . The gage pressure of the gas. b .b . The absolute pressure of the gas.

3 .3 . The absolute pressure inside a tank is 0.2 bar, and the surroundings atmospheric pressure is 101 kPa. What reading would a Bourdon gage mounted in the tank will give, in kPa? Is this a gage or vacuum reading?