HVAC Systems: Overview
HVAC Systems:
Overview
Michael J. Brandemuehl, Ph.D, P.E.
University of Colorado
Boulder, CO, USA
Overview
?
?
System Description
Secondary HVAC
Systems
?
Electric chillers
?
?
Air distribution
?
?
?
?
?
?
Michael Brandemuehl
University of Colorado
?
Room diffusers and air
terminals
Duct Design
Fan characteristics
Air Handling Units
Water distribution
Cooling coils
Pipes and pumps
Primary HVAC Systems
Air and water cooled
Compressor technologies
Performance
Thermal chillers
?
?
Absorption
Engine-driven
Cooling towers
?
Overall Design Process
1
System Overview
?
Core Objectives: healthy, productive,
comfortable indoor environment
Heating to perimeter spaces
Cooling to perimeter and core spaces
Humidification or dehumidification as needed
Ventilation to occupied spaces
?
Deliver over time and space
Time and Space
HVAC needs in each room change over
day and over year
? At any time, may need heating and cooling
in different rooms of building
?
Core needs cooling even in winter
?
Michael Brandemuehl
University of Colorado
HVAC system must meet simultaneous
diverse loads
2
System Options
?
Separate HVAC system for every zone
Residential
Motel
Strip mall
?
One HVAC system for entire building
Distribute heating, cooling, ventilation to
individual zones
AIRFLOW
Typical Home System
(WITH FAN AND FILTER)
(AIR CONDITIONING)
AIRFLOW
Michael Brandemuehl
University of Colorado
3
Typical Large Commercial System
Distributed HVAC Systems
Packaged terminal air conditioner (PTAC)
? Water loop heat pump (WLHP)
? Packaged rooftop unit (RTU)
?
Michael Brandemuehl
University of Colorado
4
Typical Small Commercial System
With Rooftop Units
Packaged Rooftop Unit (RTU)
Michael Brandemuehl
University of Colorado
5
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