Transcript 3.3 HVAC.ppt

Heating, Ventilating, and
Air-Conditioning
TABLE OF CONTENTS
• Types of Systems
• Central Forced Air
System
– Air Handling Unit
• Hot Water System
• Zoned Control System
• Radiant Heat
• Heat Pump
• HVAC Plans
Types of Systems
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Central Forced-Air Systems
Hot Water Systems
Zone Control Systems
Radiant Heat
Central Forced Air System
• Most Common HVAC System
• Circulates air through or around heating
and cooling devices.
• A fan forces air into ducts
• Supply ducts transport conditioned air into
building through diffusers or supply
registers
• Air is routed back to heating/cooling
device through return ducts
Air Handling Unit (AHU)
• Device used to condition and circulate air
as part of an HVAC system
• Large metal box containing a blower,
heating or cooling elements, filter, and
sound attenuators
• Connects to ductwork that distributes the
conditioned air through the building and
returns it to the AHU
Courtesy Eric Fisher
Air Handling Unit (AHU)
• May need to supply heating, cooling, or
both
• A furnace generates heat
– Fuel oil or natural gas
– Electric heating elements
– Heat pump
• A refrigeration system absorbs heat
– Air conditioner
– Heat pump
Air Handling Unit (AHU)
• Smaller air handlers may contain a fuel-burning
heater or a refrigeration evaporator placed
directly in the air stream
• Large commercial air handling units contain coils
that circulate water
– Boiler provides hot water or steam
– Chiller provides chilled water
©iStockphoto.com
©iStockphoto.com
Air Handling Unit (AHU)
Typical AHU components:
Wikimedia
1. Supply duct
2. Fan compartment
3. Flexible connection
4. Heating and/or cooling
coil
5. Filter compartment
6. Return and fresh air
duct
Hot Water System
• Water heated in boiler and circulated
through pipes to radiators
• Requires plumbing rather than ductwork
©iStockphoto.com
Zone Control System
• One heater and one thermostat per room
• No ductwork
• Often used in hotel rooms
Radiant Heat
• Supply heat directly to the floor, wall, or ceiling
• Hot water pipes or electric heating element runs
through building component
• Dependent on radiant heat
– Heat transferred from hot surface to people
and objects
Wikimedia
Heat Pump (HP)
• A machine or device that moves heat from one
location (the source) to another location (the
mechanical work)
• Can produce heating or cooling by reversing the
direction of heat flow
• Can be used in:
– Forced Air System
– Hot Water System
– Radiant Heat System
wikimedia
HVAC Plans
Image Courtesy Novus Architects
HVAC (Mechanical) Plans
Image Courtesy Novus Architects
HVAC Mechanical Plans
Image Courtesy Novus Architects
TABLE OF CONTENTS
• Types of Systems
• Central Forced Air
System
– Air Handling Unit
• Hot Water System
• Zoned Control System
• Radiant Heat
• Heat Pump
• HVAC Plans
Image Sources
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•
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en.wikimedia.org. Images retrieved Dec. 8, 2009.
Novus Architecture (formerly SGM Architects), Mt.
Pleasant, SC
www.istockphoto.com. Images retrieved Dec. 8, 2009.
Heating, Ventilating, and Air-Conditioning