# Top-rated ScreenCasts

Text Section | Link to original post | Rating (out of 100) | Number of votes | Copy of rated post |
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05.4 - Refrigeration | Click here. | 100 | 2 |
Refrigeration Cycle Introduction (LearnChemE.com, 3min) explains each step in an ordinary vapor compression (OVC) refrigeration cycle and the energy balance for the step. You might also enjoy the more classical introduction (USAF, 11min) representing your tax dollars at work. The musical introduction is quite impressive and several common misconceptions are addressed near the end of the video. |

14.10 Solid-liquid Equilibria | Click here. | 100 | 2 |
Solid-liquid Equilibria using Excel (7:38min, msu) The strategy for solving SLE is discussed and an example generating a couple points from Figure 14.12 of the text are performed. Most of the concepts are not unique to UNIFAC or Excel. This screeencast shows how to use the solver tool to find solubility at at given temperature. |

10.08 - Concepts for Generalized Phase Equilibria | Click here. | 100 | 1 |
Concepts for General Phase Equilibria (12:33) (msu.edu) The calculus used in Chapter 6 needs to be generalized to add composition dependence. Also, we introduce partial molar properties and composition derivatives that are not partial molar properties. We introduce chemical potential These concepts are used to show that the chemical potentials and component fugacities are used as criteria for phase equilibria. |

11.02 - Calculations with Activity Coefficients | Click here. | 96 | 5 |
Dew Temperature (7:57) (msu.edu) The culmination of the activity coefficient method is application of the fitted activity coefficients to extrapolate from limited experiments in a Stage III calculation. The recommended order of study is 1) Bubble Pressure; 2) Bubble Temperature; 3) Dew Pressure; 4) Dew Temperature. Note that an entire Txy diagram can be generated with bubble temperature calculations; no dew calculations are required. However, many applications require dew calculations, so they cannot be avoided. The dew calculations are more complicated than bubble calculations, because the liquid activity coefficients are not known until the unknown liquid mole fractions are found. This screencast describes the procedure and how to implement the method in Matlab or Excel. |

10.01 - Introduction to Phase Diagrams | Click here. | 96 | 5 |
Introduction to Phase Behavior (9:37) (msu.edu) Comprehension Questions: 1. Referring to the Txy diagram on slide 3, estimate T, nature (ie. L,V, V+L, L+L), composition(s), and amount of the phase(s) for points: a, b. d, g. |

14.10 Solid-liquid Equilibria | Click here. | 93.3333 | 3 |
SLE using Excel with the M1 model (7min, uakron.edu)
Similar to LLE in Excel, the iteration feature can be used to quickly solve for SLE at multiple temperatures.
Comprehension Questions: |

07.09 -The Molecular Basis of Equations of State: Concepts and Notation | Click here. | 93.3333 | 3 |
Nature of Molecular Interactions - Macro To Nano(8min). (uakron.edu) Instead of matching the critical point, we can use experimental data for density vs. temperature from NIST as a means of characterizing the attractive energy and repulsive volume. A plot of compressibility factor vs. reciprocal temperature exhibits fairly linear behavior in the liquid region. Matching the slope and intercept of this line characterizes two parameters. This characterization may be even more useful than using the critical point if you are more interested in liquid densities than the critical point. In a similar manner, you could derive an EOS based on square-well (SW) simulations and use the SW EOS to match the NIST data(11min), as shown in this |

07.06 Solving The Cubic EOS for Z | Click here. | 93.3333 | 3 |
1. Peng-Robinson PVT Properties - Excel (3:30) (msu.edu) Introduction to PVT calculations using the Peng-Robinson workbook Preos.xlsx. Includes hints on changing the fluid and determining stable roots. Comprehension Questions: 1. At 180K, what value of pressure gives you the minimum value for Z of methane? Hint: don't call solver. 2. At 30 bar, what value of pressure gives Z=0.95 for methane? 3. Compute the molar volume(s) (cm |

08.08 - Reference States | Click here. | 90 | 2 |
Departure Functions: PREOS.xls Compressor and OVC Design (11min) (uakron.edu) Redesign the ordinary vapor compression cycle (OVC) using propane as discussed in Chapter 5, this time applying PREOS.xls instead of the chart. In this |

09.08 - Calculation of Fugacity (Liquids) | Click here. | 90 | 2 |
Liquid fugacity relative to vapor fugacity. (LearnChemE, 5 min) This screencast shows a ^{3}/mol.Comprehension Questions: 1. How much did raising the pressure to 60 bar change the liquid fugacity (bars) (+/- 1%)? ^{3}/mol, estimate the fugacity of liquid n-pentane at 460K and 600bar.5. Compare your answers for 3 and 4 to the PREOS. |