7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

1/13

Exercise 1: to know the PT curve

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

2/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

3/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

4/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

5/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

6/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

7/13

CASE1-compare 3 envelope and critical

Refrigerated Gas Plant

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

8/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

9/13

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

10/13

Use HE(weighted)-5 intervals

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

11/13

See the graph of T vs Heat flow

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

12/13

***Important Points

1. Always save your case!2. Know the objectives of your simulation. Models are purpose built.3. Must always do material and energy balance before starting your modeling4. Always know your phase envelope5. Thermal state variables in HYSYS are generally:

a. Vfb. Tc. Pd. Molar enthalpy

Of these only two can be specified

6. Make sure u understand the system u are working with when choosing the thermodynamicpackage. Components, processes.

a. Parafic o&gb. .

7. Keep track of your dof. They can be user defined (blue) or defined by some unit op (black).8. Always imagine what is happening in the simulation/problem9. Always ASK what is the definition of standard/normal conditions, HYSYS Standard conditions are

T=60F, P=1atm

10.When using HE module in HYSYS as a heat balance/ designa. Single phase: end pointb. Phase change: weighted

11.Always use meaning labels when labeling utilities, etc12.Use of Adjust

a. Only on monotonic functions or when the bounded region is monotonicb. Cant use if the line gets flatc. Spec min max step sized. Spec min and max boundaries

13.Learn how to calculate T, P, DP(vf=1), and BP(Vf=0).a. Make sure u plot the phase env u may hv a retrograde region

14.Hypotheticals, need:a. Normal boiling pointb. Std liq densityc. MW

Recommended to have at least (a) and (b)

15.Shortcut labels: Shift T, P, F, M to view variables values instead of stream names for labels16.When doing some design, make sure u always have some margin!17.When using the UO, make sure u understand the thermodynamics behind them

Eg:

a. Valve: isenthalpicb. Mixer: adiabetic

7/31/2019 RefreshRefresh (dynamic_bypass_reload)Click here if you are not automatically redirected.For assistance, contact

13/13

c. Compressor/pump: isentropic/polytropic18. for case study, make sure you specify the upper and lower limit19. intensive properties dont depend on how much material there is20.when defining phases, you must be specific:

a. subcooledb. saturatedc. critical

21. for mixed component system with broad boiling point component instead of the critical point ofdefining maxima, u will have the cricon and cricon

22. for HE u can use approach fuction to fix the temp approachyou could also simply define stream temp but u will need ti update them when condition change

23.provide meaningful name for utilities other obj in ur simulation., it will make them easier toindentify in list

24.process sim software cant make a bad eng better25.make sure you RTFM!!!