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

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
duct< 200’

5. Simple Basics

6. Heating Units - Air Split System - w/ Gas Furnace upflow downflow
horizontal

7. Heating Units (cont.)
Single Package
w/ electric heating

8. Water Systems
boiler on
cooling tower
off
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 Allows for each unit to be controlled
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
Water in tube
Circulating pump

19. Radiant Systems
Iron Sectional
Fin-tube radiator

20. Next Time Basics of Air Conditioning 12
Cooling Systems; Refrigerants; Condenser/Evaporator Compressive; Absorption; Evaporative; Chillers; Heat Sinks
Chapter 4 (Toa)