Reminder about the Filed Trip
Tomorrow 8 am St. Edward's University
We will meet at 8:00 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.
Extra office hours
Questions related to the final project
Tomorrow my office scheduling at:
• http://doodle.com/aksyssfr58yk58xy
Course project presentation
• Monday, May 5th 9:30 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.
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
Pumps and Plumbing
• Very similar to fans and ducts
• Same principles based on fluid dynamics
• With some specifics
Pumps
• Driving force to move air water in buildings
• Raise pressure and produce flow
• One main type
• Centrifugal
Pump curves
Plumbing system design
Head loss
Economizer
Fresh air volume flow rate control
Controlled device is damper
damper
fresh
air
- Damper for the air
- Valve for CC
mixing
recirc.
air
T & RH sensors
Economizer
% fresh air
Fresh air volume flow rate control
enthalpy
damper
Fresh
(outdoor)
air
TOA (hOA)
mixing
Recirc.
air
T & RH sensors
100%
Minimum for
ventilation
Economizer – cooling regime
Example of SEQUENCE OF OERATIONS:
If TOA < Tset-point open the fresh air damper the maximum position
Then, if Tindoor air < Tset-point start closing the cooling coil valve
If cooling coil valve is closed and T indoor air < Tset-point start closing
the damper till you get T indoor air = T set-point
Other variations are possible
Heat recovery
Heat recovery
Desiccant wheel
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
Commercial HVAC Systems
Multi zone
Single zone
CAV
With and
without
humidity
control
VAV
VAV
With and Dual
without
duct
reheaters
This is not the complete list !
CAV
Dual
With
reheaters duct
DOAS with
fan coils
or radiant
ceilings
All Hydroinic
that relay on
infiltration
DOAS with
fan coils
Course overview
Topics:
1. Background, Introduction and Review
2. Heating and Cooling Loads
3. Psychrometrics and mass transfer
4. Air conditioning and refrigerant cycles
5. Chillers and Boilers
6. Coils and heat exchangers
7. Ducts, air, and water systems
8. Large HVAC Systems
9. HVAC Control
10.Final Project, field trip
2 wks
1 wk
1 wk
2 wks
1 wk
2 wks
2 wks
2 wk
2 wk
1 wk
Course objectives
•
•
•
•
•
Apply fundamental physical principles to HVAC design
Describe and size each component in an HVAC system
Design HVAC systems based on manufacturer’s 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