Reminder about the Filed Trip

1
Reminder about the Filed Trip

• Tomorrow 8 am St. Edward's University
• We will meet at 800 am at the south entrance of
  the new Science building (visitor parking is on
  the east side outside of the garage which is on
  the east side of the softball field).
• http//www.stedwards.edu/map/maincampus
• Wesley Stidham, PE
• Principal, Shah Smith and Associates, Inc
• Very important
• Standard safety protocol is to apply no open
  toed shoes, ties or loose clothing, etc.

2
Extra office hours

• Questions related to the final project
• Tomorrow my office scheduling at
• http//doodle.com/aksyssfr58yk58xy

3
Course project presentation

• Monday, May 5th 930 am, same classroom
• Timing 6 minutes
• Approximately 1 PowerPoint Slides per minute
• For example
• Specify the project (1slide)
• Provide some basic floor layout and input
  variable assumptions
• Results (form calculation and manufacturer
  catalogs)
• Disuses you system challenges and modifications
  related to your design solutions
• 2-3 minutes for Question and Answers
• I will need you power point before the class
• You can email it to me.

4
Class Objectives

• 10 minutes presentation about HVAC and Building
  Acoustics
• Continue about the Economizer and Heat recovery
• Discuss hydronic system and advance HVAC systems
• Summarize the course
• - course evaluation

5
Pumps and Plumbing

• Very similar to fans and ducts
• Same principles based on fluid dynamics
• With some specifics

6
Pumps

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

Pump curves
7
Plumbing system design
Head loss
8
Economizer

• Fresh air volume flow rate control

Controlled device is damper - Damper for the
air - Valve for CC
fresh air
damper
mixing
recirc. air
T RH sensors
9
Economizer
fresh air

• Fresh air volume flow rate control

100
enthalpy
Fresh (outdoor) air
TOA (hOA)
Minimum for ventilation
damper
mixing
Recirc. air
T RH sensors
10
Economizer cooling regime
Example of SEQUENCE OF OERATIONS If TOA lt
Tset-point open the fresh air damper the maximum
position Then, if Tindoor air lt Tset-point
start closing the cooling coil valve If cooling
coil valve is closed and T indoor air lt
Tset-point start closing the damper till you
get T indoor air T set-point Other
variations are possible
11
Heat recovery
12
Heat recovery
13
Desiccant wheel
14
Residential vs. Commercial systems

• Course focus was on HVAC equipment that is used
  in both residential and commercial systems
• Emphasize on the application in commercial
  systems

15
Commercial HVAC Systems
Multi zone
Single zone
All Hydroinic that relay on infiltration
VAV
CAV
VAV
CAV
With and without humidity control
With and without reheaters
Dual duct
Dual duct
With reheaters
DOAS with fan coils
DOAS with fan coils or radiant ceilings
This is not the complete list !
16
(No Transcript)
17
Course overview

•  
• Topics
• Background, Introduction and Review 2 wks
• Heating and Cooling Loads 1 wk
• Psychrometrics and mass transfer 1 wk
• Air conditioning and refrigerant cycles 2 wks
• Chillers and Boilers 1 wk
• Coils and heat exchangers 2 wks
• Ducts, air, and water systems 2 wks
• Large HVAC Systems 2 wk
• HVAC Control 2 wk
• Final Project, field trip 1 wk

18
Course objectives

• Apply fundamental physical principles to HVAC
  design
• Describe and size each component in an HVAC
  system
• Design HVAC systems based on manufacturers
  datasheets
• Contrast residential systems with commercial
  systems and use appropriate design techniques for
  each type of system
• Solve HVAC design problems with high-quality
  references