Review for the Exam

1
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

2
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 ?W/?h
• Plot processes on a chart for real buildings
• List what is held constant for different
  processes
• Describe processes in AHUs in psychrometric chat

3
Direct Contact (10)

• Purpose of cooling towers
• Psychrometrics
• Describe how a cooling tower works

4
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

5
Heat Exchangers (11)

• Differentiate types
• Calculate e, and UA, etc.
• Complete broad analysis
• Which m is larger, which ?t is larger?
• Within and between heat exchangers

6
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

7
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

8
Duct layout/design (18)

• Equal friction method
• Supply or return systems
• Balance the system

9
Final Project

• Think about the group members
• and your favorite topic

10
PumpsFans

• Driving force to move air water in buildings
• Raise pressure and produce flow
• One main type
• Centrifugal

11
Pump curves

• NPSHR Net Positive Suction Head Required

12
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13
Finding Volumetric Flow

• Same procedure as for air
• Intersection of pump curve and system curve
• How can you control flow?

14
Changing Pump Speed
15
Use Multiple Pumps
16
Plumbing Arrangements
17
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18
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19
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20
Example 19.7

• Similar to equal friction method
• Calculate head loss for common pieces of system
• Size pipes to have equal head loss between points
  2 and 3