engr2010-f11-hw02

# engr2010-f11-hw02 - 50 2000 250 0.01 500 0.5 333 777 0.5...

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ENGR 2010 Thermodynamics I: Homework Set 2 1. Determine the ocean depth at which the water becomes supercritical. Assume the density of the water is that of fresh water at 20 C. 2. A closed system contains m = 10 kg of water at 120 C. The water is a saturated mixture, and 90% of the water by volume is in the liquid phase. Find the total volume of the water and the pressure. Use the text water tables for property data. 3. Fill in the missing property ( T , P , v , and x , if applicable) and denote the phase (compressed liquid, saturated mixture, superheated vapor). The substance is water. Use the water tables to arrive at a solution. You can check your work with the H2O.exe code on the website, or with the text–supplied software. The last two entries are especially difficult when using the tables; the first involves a double interpolation, and the second involves trial–and–error. T, C P , kPa v , m 3 /kg x phase 150 2.00 300 0.5 450 2000
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Unformatted text preview: 50 2000 250 0.01 500 0.5 333 777 0.5 0.5 4. A rigid container, of volume V = 0 . 1 m 3 , contains 1 kg of water. Initially the system is at a temperature of T 1 = 30 ◦ C. (a) What is the initial pressure and quality (if applicable) of the water? (b) Heat is now added to the container and the temperature increases. The process stops when the water exists as a single phase. What is the ﬁnal pressure? To work part b), you need to recognize the type of process going from the initial to the ﬁnal state. What property stays constant? 5. A mass of 1 kg of R–134a is contained in a rigid glass vessel of volume V = 0 . 05 m 3 . The system is initially at T 1 = 30 ◦ C. (a) What is the initial pressure of the R–134a? (b) The system is now cooled, and the process is stopped when liquid is ﬁrst observed to condense onto the glass. What is the ﬁnal temperature?...
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