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Hot water heating Hot water heating … and today… and today
PrinciplePrinciple– Heating systemHeating system
Heat sourceHeat source Distribution Distribution
networknetwork Heat emitterHeat emitter
– Heat transfer Heat transfer mediummedium
waterwater steamsteam airair
Expansion vessel
Heat emmiter
Boilerl
H
T 1 , 1
T 2 , 2 Supply
Return
Expansion vessel
Heat emmiter
Boilerl
H
T 1 , 1
T 2 , 2 Supply
Return
Hot-water heatingHot-water heating
TerminologyTerminology
Boiler
Radiator
Main supply/return pipe
Branch supply/return pipe
Radiator valve
Ventcock
Drain/feed cock
Shutoff valves
Expansion tank
Manual Control valve
Radiator
Heating system designHeating system designInitial information about Initial information about
the buildingthe building– TypeType
industrial, office, dwellingindustrial, office, dwelling
– OperationOperation continuous, intermittentcontinuous, intermittent single, multiplesingle, multiple
– StructureStructure heavy, light heavy, light new, reconstructionnew, reconstruction
Heating system design Heating system design Functional requirFunctional requireementsments
Connection of the heat emitters Connection of the heat emitters with the heat sourcewith the heat source
DeaerationDeaeration DrainingDraining Integration into the buildingIntegration into the building
Heating system design Heating system design Optimisation criterionsOptimisation criterions
Length of the pipes Location of the heat emmiters Control of the system Investment costs Operational costs Maintenance
Design parameters of hot Design parameters of hot water heating systemswater heating systems
– (1) Water circulation– (2) Geometry of the system– (3) Water temperature– (4) Expansion vessel – (5) Materials
Water circulationWater circulation
Natural – without Natural – without pumppump
Expansion vessel
Heat emmiter
Boilerl
H
T 1 , 1
T 2 , 2 Supply
Return
Expansion vessel
Heat emmiter
Boilerl
H
T 1 , 1
T 2 , 2 Supply
Return
P1=h.ρ1 .g
P2=h.ρ2.g
ΔPF=ΔPn + ΔPP
Forced – with pumpForced – with pump
ΔPn=P2-P1=h.(ρ2- ρ1 ).g
P2P1
Geometry of the systemGeometry of the system
Relative connection of the heat Relative connection of the heat emittersemitters– One-pipe, two-pipeOne-pipe, two-pipe
Main pipe lay-outMain pipe lay-out– Upper, lower, combinedUpper, lower, combined
Branch pipes lay-out Branch pipes lay-out – vertical, horizontal , microborevertical, horizontal , microbore
Geometry of the system Geometry of the system Relative connection of the heat Relative connection of the heat
emittersemitters
Relative connection of the heat Relative connection of the heat emittersemitters
– Two-pipe systemTwo-pipe system
– One-pipe systemOne-pipe system
One-pipe systemsBasic schemes of the connection
•With mixing valveWith mixing valve •Two-point•One-point
• With By-PassWith By-Pass –“Horse Rider“ – Controlled by-pass
•SerialSerial
Relative connection of the Relative connection of the heat emittersheat emitters
ConclusionConclusion
Two-pipe X one-pipe system
– Length of the pipes– Water circulation – Measuring and control– Pressures in the system