ENT 143 Tutorials Questions Tutorial 2 Properties of

Solution 2. We know that it is a saturated mixture, so, the temperature is

6. From these value, we can identify the phase. When P= 1000 Kpa ,

PRACTICE PROBLEM Complete this table for R-134 a T, °C a) P, k. Pa

SOLUTION Complete this table for R-134 a T, °C a) P, k. Pa x

QUESTION Superheated water vapor at 1. 4 MPa and 250 °C is allowed to

PRACTICE PROBLEM A piston-cylinder device contains 0. 6 kg of steam at 200 °C

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ENT 143 Tutorial’s Questions Tutorial 2 Properties of Pure Substance

EXAMPLE 1 2

Solution 2. We know that it is a saturated mixture, so, the temperature is equals to the saturation temperature (Tsat) 1. If x has a value higher then 0, we know it is a saturated mixture 3. Use equation u = uf + xufg 120. 21 (Table A-5) 1719. 26 232. 23 (Table A-4) Saturated mixture 0. 535 Saturated mixture 2. We know that it is a saturated mixture, so, the pressure is equals to the saturation pressure (Psat) 4. From these value, we can identify the phase. When T= 125 o. C , uf= 524. 83 kj/kg, ug= 2534. 3 kj/kg. But u=1600 kj/kg. So, uf<u<ug. So, it is in saturated mixture phase 3

6. From these value, we can identify the phase. When P= 1000 Kpa , uf= 761. 39, ug= 2582. 8 kj/kg. But u=2950 kj/kg. u>ug. So, it is in superheated vapour phase 7. Refer table A-6 and interpolate 120. 21 (Table A-5) 1719. 26 232. 23 (Table A-4) 0. 535 395. 2(Table A-6) 313. 99 172. 94(Table A-5) Saturated mixture 731. 0 (Table A-5) - Saturated mixture Superheated Vapour Compressed liquid Saturated Liquid 9. 8. 10. x=0 means that it is a saturated liquid. 4

PRACTICE PROBLEM Complete this table for R-134 a T, °C a) P, k. Pa x -24 170 c) 600 d) -10 e) -14 f) 1 180 0. 6 500 1200 44 Phase description Saturated Liquid b) g) h, k. J/kg 300. 63 1. 0 5

SOLUTION Complete this table for R-134 a T, °C a) P, k. Pa x -24 170 c) 600 d) -10 e) -14 f) 1 180 0. 6 500 1200 44 Phase description Saturated Liquid b) g) h, k. J/kg 300. 63 1. 0 6

QUESTION 3 -48 7

SOLUTION 8

Example 3 9

Example 3 - Solution 10

QUESTION Superheated water vapor at 1. 4 MPa and 250 °C is allowed to cool at constant volume until the temperature drops 120 °C. At the final state, determine a) The pressure, b) The phase, and quality, x c) The enthalpy. d) Show the process on a T-v diagram with respect to saturation lines. 11

SOLUTION 12

PRACTICE PROBLEM A piston-cylinder device contains 0. 6 kg of steam at 200 °C and 0. 5 Mpa. Steam is cooled at constant pressure until one half of the mass condenses. a) Find the final temperature b) Determine the volume change c) Show the process on a T-v diagram 13

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