Objectives

1
Objectives

• Continue with advance HVAC systems
• Compare Residential and Commercial Systems
• - Trends in residential HVAC

2
Sensible and Enthalpy Wheels
3
Heat recovery system in NSM building at UT
4
Desiccant wheel
5
ReviewComputer software for load calculation

• http//www.xpedio.carrier.com/idc/groups/public/do
  cuments/marketing/hap_ehelp_009.pdf
• http//www.doe2.com/equest/
• http//apps1.eere.energy.gov/buildings/tools_direc
  tory/subjects.cfm/pagenamesubjects/pagename_menu
  whole_building_analysis/pagename_submenuenergy_si
  mulation

6
Review 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

7
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 ! There is no
strict division!
8
Typical Components in Commercial systems

• Constant operation
• Outdoor air supply
• Two fans (supply and return)
• Multizone system
• Control
• ..

9
Residential Systems

• Buildings are responsible for 40 of US energy
  use
• 1/3-1/2 houses
• There is a large push for conservation in this
  sector
• Zero Energy homes
• http//www.eere.energy.gov/buildings/building_amer
  ica/pdfs/29915_zeb_path.pdf
• http//www.toolbase.org/ToolbaseResources/level3.a
  spx?BucketID2CategoryID58

10
Residential System
11
Residential system

• Technology is feasible and cost-effective
• Several barriers to widespread use
• Up-front costs are still higher
• Insufficient data on resale costs
• Lack of experienced designers