Heating Systems

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Heating Systems

• HVAC 11a
• CNST 305
• Environmental Systems 1
• Dr. Berryman

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Types of Heating Systems

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Energy Sources
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Circulating Air Systems
Must make good cost projections to assure an
economical selection

• Heat distributed by an air stream through a
  heating unit to supply ducts
• ductlt 200

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Simple Basics
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Heating Units - Air
Split System - w/ Gas Furnace upflow downflow h
orizontal
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Heating Units (cont.)
Single Package w/ electric heating
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Water Systems

• Heat is distributed by a pumped water system
  though a heating unit to supply piping

Different piping arrangements are used Hydronic
Piping
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Boilers

• Water Tube Low Fire Box
• Gasses pass around tubes
• Responds quickly to load fluctuations.
• Types range from small (residential) to large
  (commercial)

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Boilers (cont.)

• Water Tube High Fire Box

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Piping Configurations

• Series Loop
• One Pipe
• Two Pipe
• Three Pipe
• Four Pipe

One pipe system
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Series Loop

• Maintenance or repair requires shutdown
• Temp control at each unit impossible
• units limited
• Only heating or cooling

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One Pipe System
Diverting Tee

• Allows for each unit to be controlled
• Limited of units that can be serviced
• Needs special fittings
• Only heating or cooling

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Two Pipe Reverse Return

• Each unit fed by individual supply branch
• Each unit can be controlled
• Flow rates are balanced (heat or cool only)

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Three Pipe System

• Similar to two pipe systems
• Allows for simultaneous heating and cooling
• Mixed return
• Prohibited by some energy codes

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Four Pipe System

• It is actually 2- two pipe systems
• Allows for simultaneous heating and cooling
• Separate water return for heating and cooling
• Most efficient
• Most expensive initial cost

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Steam

• Expands 1000 its original state
• Creates its own transport system
• No pumps
• Piping configurations same for water only at
  low pressures
• Operating temps 220 250oF
• About 15 pisg
• High Pressures (60 350 psig)
• Use heat exchanges
• Need steam traps

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Steam to Water Heat Exchanger
Steam in tube
Circulating pump
Water in tube
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Radiant Systems
Iron Sectional
Fin-tube radiator
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Next Time

• Basics of Air Conditioning