1. Next Class: Text 1.5 hour long Open book, open notes - Comprehensive
Bee in class at 12:20 pm
Open book, open notes
- Comprehensive
Next week (Monday at 10-12) extra office hours related to the Test

2. Objectives Finish with Ducts design Review for the Exam Example
Answer your

3. Frictional Losses

4. Non-circular Ducts
Parallel concept to wetted perimeter

5. Dynamic losses Losses associated with Two methods
Changes in velocity
Obstructions
Bends
Fittings and transitions
Two methods
Equivalent length and loss coefficients

6. Loss Coefficients
ΔPt = CoPv,0

7. Electrical Resistance Analogy

8. Example 18.7
Determine total pressure drop from 0 to 4

9. Fan selection
Calculated DP and V

10. Fan Performance

11. Conversion Between Methods
Se Example 18.8 and compare with 18.7

12. Review for the Exam
Should be able to do all calculations associated with lectures as well as HWs
Problems may deal with context
i.e. Explain how thermal conductivity influences fin efficiency? Holding all other parameters equal, how important is increasing the thermal conductivity

13. Psychrometrics and Processes (7 & 8)
Know all parameters and their location/orientation on a psychrometric chart
Be able to look up conversions of parameters on a psychrometric chart and with calculations
Use protractor to calculate SHR and ΔW/Δh
Plot processes on a chart for real buildings
List what is held constant for different processes
Describe processes in AHUs in psychrometric chat

14. Direct Contact (10) Purpose of cooling towers Psychrometrics
Describe how a cooling tower works

15. Cycles (3), Refrigerants (4)
Describe Carnot cycle and components
Understand constant variables for each component
List, describe, and calculate inefficiencies
Use figures, refrigerant tables and equations for different substances
List important parameters for refrigerant selection/differentiation

16. Heat Exchangers (11) Differentiate types Calculate ε, and UA, etc.
Complete broad analysis
Which m is larger, which Δt is larger?
Within and between heat exchangers

17. Heat Exchangers (11)
Calculate and compare different thermal resistances
Describe influence of key factors
Integrate different parameters/resistances
Manipulate UA equation
Describe differences for wet and dry heat exchangers

18. Diffusers, Duct Components (18)
Select diffusers
Define all terms on manufacturer data sheets
Calculate pressure drop of:
Straight duct
Duct fittings
Differentiate fans and describe fan curves

19. Duct layout/design (18) Equal friction method Supply or return systems
Balance the system