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Heating Systems

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11a Heating Systems; Fuels; Boilers; Furnaces; Hydronics, Radiant Heat Chapter 5 (Toa) Heating Systems HVAC 11a CNST 305 Environmental Systems 1 Dr. Berryman – PowerPoint PPT presentation

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Title: Heating Systems


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

2
Types of Heating Systems

3
Energy Sources
4
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

5
Simple Basics
6
Heating Units - Air
Split System - w/ Gas Furnace upflow downflow h
orizontal
7
Heating Units (cont.)
Single Package w/ electric heating
8
Water Systems
  • Heat is distributed by a pumped water system
    though a heating unit to supply piping

Different piping arrangements are used Hydronic
Piping
9
Boilers
  • Water Tube Low Fire Box
  • Gasses pass around tubes
  • Responds quickly to load fluctuations.
  • Types range from small (residential) to large
    (commercial)

10
Boilers (cont.)
  • Water Tube High Fire Box

11
Piping Configurations
  • Series Loop
  • One Pipe
  • Two Pipe
  • Three Pipe
  • Four Pipe

One pipe system
12
Series Loop
  • Maintenance or repair requires shutdown
  • Temp control at each unit impossible
  • units limited
  • Only heating or cooling

13
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

14
Two Pipe Reverse Return
  • Each unit fed by individual supply branch
  • Each unit can be controlled
  • Flow rates are balanced (heat or cool only)

15
Three Pipe System
  • Similar to two pipe systems
  • Allows for simultaneous heating and cooling
  • Mixed return
  • Prohibited by some energy codes

16
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

17
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

18
Steam to Water Heat Exchanger
Steam in tube
Circulating pump
Water in tube
19
Radiant Systems
Iron Sectional
Fin-tube radiator
20
Next Time
  • Basics of Air Conditioning
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