1. Material and Energy Balances Review
ChE 160 SI – Becca
Fall 2016

2. Exam Notes
Calculator
50/50 calculations and programming
Cumulative (including matlab functions)

3. Broad Topics ChemE professional problem format Material balances
Energy balances
Engineering economics
Write down:
Everything you remember about these topics on the front
Topics you’re questionable about or don’t quite remember on the back
Write for at least 1 minute

4. Specific Topics Problem presentation General closed energy balance
General material balance equation
E bal assumptions
Internal E (U) vs enthalpy (H)
Mat. balance assumptions
I, P, F, A, n, i
Continuous vs batch
APR
Degrees of Freedom
EUAC
Process flow diagram
Cash flow diagrams
Recycle and Bypass
General open energy balance

5. What is the standard chemical engineering problem presentation format?
Diagram Given Find Assume Solution Analysis

6. General material balance equation
In – Out + Generation – Consumption = Accumulation In – Out = 0

7. Degrees of Freedom
# Unknowns # Components or material balances # Physical constraints (x1 + x2 = 1) # Process specifications

8. General Energy Balance Equations
Closed Q - Ws = ΔKE + ΔPE + ΔU Open Q - Ws = ΔKE + ΔPE + ΔH

9. Energy Balance Term Cancellation
Q = 0
System and surroundings have same T or if the system is perfectly insulated (adiabatic)
W = 0
No moving parts, electrical currents, radiation
ΔKE = 0
System is not accelerating
ΔPE = 0
System does not rise or fall (no change in height)
ΔU = 0
No ΔT, no phase change, no reaction

10. Engineering Economics
I, P, F, A, n, i
APR
EUAC = Equivalent Uniform Annual Cost
Net present value
Cash Flow Diagrams

12. How did that go?