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Heating Systems

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

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Heating Systems

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

  2. Types of Heating Systems

  3. Energy Sources

  4. Circulating Air Systems • Heat distributed by an air stream through a heating unit to supply ducts • duct< 200’ Must make good cost projections to assure an economical selection

  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. cooling tower off boiler on 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 Water in tube Circulating pump

  19. Radiant Systems Iron Sectional Fin-tube radiator

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

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