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). 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:

Course project presentation Monday, May 5 th 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 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 mixing damper fresh air T & RH sensors recirc. air Controlled device is damper - Damper for the air - Valve for CC

Economizer Fresh air volume flow rate control mixing damper Fresh (outdoor) air T & RH sensors Recirc. air % fresh air Minimum for ventilation 100% T OA (h OA ) enthalpy

Economizer – cooling regime Example of SEQUENCE OF OERATIONS: If T OA < T set-point open the fresh air damper the maximum position Then, if T indoor air < T set-point start closing the cooling coil valve If cooling coil valve is closed and T indoor air < T set-point start closing the damper till you get T indoor air = T set-point Other variations are possible

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 Single zone Multi zone VAVCAV VAVCAV All Hydroinic that relay on infiltration With and without reheaters DOAS with fan coils or radiant ceilings With reheaters Dual duct Dual duct DOAS with fan coils With and without humidity control This is not the complete list !

Course overview Topics: 1.Background, Introduction and Review2 wks 2.Heating and Cooling Loads1 wk 3.Psychrometrics and mass transfer1 wk 4.Air conditioning and refrigerant cycles2 wks 5.Chillers and Boilers1 wk 6.Coils and heat exchangers2 wks 7.Ducts, air, and water systems2 wks 8.Large HVAC Systems2 wk 9.HVAC Control2 wk 10.Final Project, field trip1 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