3.3 Hvac
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Transcript of 3.3 Hvac
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Heating, Ventilating, and Air-Conditioning
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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
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Types of Systems
• Central Forced-Air Systems• Hot Water Systems• Zone Control Systems• Radiant Heat
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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
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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
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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
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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
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Wikimedia
1. Supply duct2. Fan compartment3. Flexible connection4. Heating and/or cooling coil5. Filter compartment6. Return and fresh air duct
Typical AHU components:
Air Handling Unit (AHU)
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Hot Water System
• Water heated in boiler and circulated through pipes to radiators
• Requires plumbing rather than ductwork
©iStockphoto.com
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Zone Control System
• One heater and one thermostat per room• No ductwork• Often used in hotel rooms
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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
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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
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HVAC Plans
Image Courtesy Novus Architects
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HVAC (Mechanical) Plans
Image Courtesy Novus Architects
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HVAC Mechanical Plans
Image Courtesy Novus Architects
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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
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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.
Image Sources
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Heating, Ventilating, and Air-Conditioning