Problem HY.4 Questions
team_name
date
0. What are the molar flow rates (lbmol/h) and mass fractions of the exit streams leaving the tee
divider in the below chemical process?
Property
total flow in lbmol/h:
mass frac.of methanol:
mass frac.of ethanol:
mass frac.of water:
Stream E1
Stream E2
________
________
Each property value was obtained by copying it from HYSYS and pasting it here.
1. Which HYSYS stream mixer simulation algorithm in Appendix D would you use to solve the
mixer section of this problem?
 ____________   mixer__  ____________,
____________ 
What other unit parameter, which is not referred to in the algorithm, must you specify in
HYSYS?
You must also set the outlet pressure to be the lowest of the inlet pressures.
2. Which HYSYS stream tee simulation algorithm in Appendix B would you use to solve the tee
section of this problem?
 ____________,
____________   tee__  ____________, _________ 
Note that the tee divider operation is analogous to a batch process of taking a liquid mixture in
a large beaker and pouring it into two smaller beakers. What is true about the state of the
material in all three beakers? About the amounts?
They have the ______ temperature, pressure, and composition, but the amounts _______.
3. What are the temperature in F, molar enthalpy in kcal/kgmole, mass density in kg/m3, molar
volume in m3/kgmole, and mole fractions of the tee’s inlet and exit streams?
Property
Temperature, oF:
Molar Enthalpy, kcal/kgmol
Mass Density, kg/m3
Molar Volume, m3/kgmol
mole frac.of methanol:
mole frac.of ethanol:
mole frac.of water:
Stream Mix
Stream E1
Stream E2
________
________
________
Each property value was obtained by copying it from HYSYS and pasting it here.
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Problem HY.4 Questions
team_name
date
What is unique about these values?
All of these property values for the tee inlet and exit streams are the ________.
What are the temperature, molar enthalpy, mass density, molar volume and mole fractions, in
the same units, of the mixer’s inlet and exit streams?
Property
Temperature, oF:
Molar Enthalpy, kcal/kgmol
Mass Density, kg/m3
Molar Volume, m3/kgmol
mole frac.of methanol:
mole frac.of ethanol:
mole frac.of water:
Stream Alcohol
Stream Water
Stream Mix
________
________
________
Each property value was obtained by copying it from HYSYS and pasting it here.
How do these values for the mixer streams differ from those for the tee? Why?
The property values of the mixer inlet and exit streams are __________________.
The tee divides one stream into two identical streams with only __________________.
The mixer combines two unlike inlet streams into __________________________.
4. What is the material relative imbalance (%RIB) for the process flowsheet? Show your
calculations. The material %RIB equals 100*(mass flow in – mass flow out) / (mass flow in).
You are to draw an overall system boundary around the flowsheet, which contains the mixer and tee
operations. The only material and energy streams you are to consider in your imbalance calculation
are those that cut your overall system boundary. Therefore, you would not consider Stream Mix in
your calculations.
% RIBMB 
_________________
mA  mW
 100
  ________ +________  ________  ________  kg/h 
  100
 ________ +________  kg/h


 ______
% RIBMB  
% RIBMB
Each total flow value was obtained by copying it from HYSYS and pasting it here.
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Problem HY.4 Questions
team_name
date
5. What is the energy relative imbalance (%RIB) for the process flowsheet? Show your
calculations. The energy %RIB equals 100*(energy flow in – energy flow out) / (energy flow
in).
% RIBEB 
_________________
E A  EW
 100
  __________    __________    __________    __________   kJ/h 
  100

__________

__________
kJ/h










% RIBEB  __________
% RIBEB   
Each energy flow value was obtained by copying it from HYSYS and pasting it here.
In the HYSYS software, the Mass/Energy Balance page within the Flowsheet/Flowsheet Summary
menu provides the relative imbalances for material and energy.
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