UNL CNST 305 - Heating Systems (20 pages)

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Heating Systems



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Heating Systems

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Lecture Notes


Pages:
20
School:
University of Nebraska-Lincoln
Course:
Cnst 305 - Building Environmental Technical Systems I

Unformatted text preview:

Heating Systems HVAC 11a CNST 305 Environmental Systems 1 Dr Berryman 11a Heating Systems Fuels Boilers Furnaces Hydronics Radiant Heat Chapter 5 Toa Types of Heating Systems Energy Sources 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 Simple Basics Heating Units Air Split System w Gas Furnace upflow downflow horizontal Heating Units cont Single Package w electric heating Water Systems Heat is distributed by a pumped water system though a heating unit to supply piping Different piping arrangements are used Hydronic Piping cooling tower off boiler on Boilers Water Tube Low Fire Box Gasses pass around tubes Responds quickly to load fluctuations Types range from small residential to large commercial Boilers cont Water Tube High Fire Box Piping Configurations Series Loop One Pipe Two Pipe Three Pipe Four Pipe One pipe system Series Loop Maintenance or repair requires shutdown Temp control at each unit impossible units limited Only heating or cooling 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 Two Pipe Reverse Return Each unit fed by individual supply branch Each unit can be controlled Flow rates are balanced heat or cool only Three Pipe System Similar to two pipe systems Allows for simultaneous heating and cooling Mixed return Prohibited by some energy codes 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 Steam Expands 1000 its original state Piping configurations same for water only at low pressures Creates its own transport system No pumps Operating temps 220 250oF About 15 pisg High Pressures 60 350 psig Use heat exchanges Need steam traps Steam to Water Heat Exchanger Steam in tube Water in tube



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