E234-Assignment4-F2009

E234-Assignment4-F2009 - Stevens Institute of Technology...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Stevens Institute of Technology E234 - Thermodynamics Assignment 4 Due Date: Sections A and B : Tuesday, October 6, 2009 Section C: Thursday, October 8, 2009 There will be a quiz at the end of the recitation. Learning Objectives You should be able to: a) Define the first law of thermodynamics, internal energy, heat, work b) Determine various forms of work such as electrical, boundary, shaft and spring c) Define triple point, saturation curve, superheated vapor, saturated liquid, vapor and solid, compressed liquid d) Draw T-v and P-v curves at various pressures e) Draw P-T diagram Reading and Study Assignment: 1. Chapter 2 2. Lecture notes – Module 2 3. Chapter 3 to Section 3-4 inclusive 4. Module 3 to slide 20 Homework 1. Dry ice is the name of solid carbon dioxide. How cold must it be at atmospheric (100 kPa) pressure? If it is heated at 100 kPa what eventually happens? 2. How accurate is it to assume propane is an ideal gas at room conditions? (Critical properties are listed inTable A-1); How about hydrogen? How about water? Please explain your reasoning carefully. ??? Calculate the ideal gas constant for argon and hydrogen Table A-2 Rg = Ru/M Ar 0.2081 kJ/kg.K H2 4.1240akJ/kg.K 3. Modern extraction techniques can be based on dissolving material in supercritical fluids such as ethyl alcohol. How high are pressure and density of ethyl alcohol when the pressure and temperature are around the critical point. You may need to get the P-T diagram for CO2 FALL 08 Fall 2009 Modern extraction techniques can be based on dissolving material in supercritical fluids such as carbon dioxide (e.g. caffeine in making decaf). How high are pressure and density of carbon dioxide when the pressure and temperature are around the critical point. Repeat for methyl alcohol. CO2 : Table A.1: Pc = 7.39 MPa, Tc = 304.2 K, vc = 0.0943 m3/kmol ρc = 1/vc = 1/0.00212 = 472 kg/m3 CH3OH: Table A.1: Pc = 7.95 MPa, Tc = 513.2 K, vc = 0.1180 m3/kmol ρc = 1/vc = 1/0.00363 = 275 kg/m3 4. Determine whether water at each of the following states is a compressed liquid, a superheated vapor, or a mixture of saturated liquid and vapor (Tables A-4 to A-9). a. P = 20 MPa, v = 0.003 m3/kg b. 1 MPa, 190°C c. 200°C, 0.1 m3/kg d. 10 kPa, 10°C FALL 07 Determine whether water at each of the following states is a compressed liquid, a superheated vapor, or a mixture of saturated liquid and vapor. a. P = 50 MPa, v = 0.003 m3/kg Pressure is above critical pressure; Table A-6 superheated around 455 oC b. 1 MPa, 180°C Table A-4, at 180 °C, Psat = 1002.8 kPa, P >Psat compressed liquid c. 200°C, 0.102 m3/kg Table A-4, at 200°C, 0.001157< v < 0.12721 saturated mixture d. 15 kPa, 10°C Table A-4, at 10 °C, Psat = 1.2281 kPa, P > Psat compressed liquid Fall 2009 ...
View Full Document

Ask a homework question - tutors are online