Condair Mk5 - Steam Installation Procedures

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5.3 Steam installation
5.3.1 Positioning and mounting of the steam distribution pipes
The location for the steam distribution pipes should be determined at the time of dimensioning the
airconditioningsystem.Pleasenotethefollowinginstructionstoensureproperhumidicationofthe
duct air.
Calculating the humidication distance
Thewatervapor,emittingfromthesteamdistributionpipes,requiresacertaindistancetobeabsorbed
by the ambient air so that it is no longer visible as steam. This distance is referred to as humidica-
tion distance “B
N
” and serves as a basis for the determination of the minimum distances from the
upstream components in the system.
Humidication
distance B
N
Expansionandmixingzone
φ1: Incoming air humidity beforehumidication
φ2: Air humidity afterhumidication
Thecalculationofthehumidicationdistance“B
N
” is dependent on several factors. For a rough estima-
tionofthehumidicationdistance“B
N
”,thefollowingtableisuseful.Recommendedstandardvalues
listedinthistablearebasedonasupply-airtemperaturerangeof15°Cto30°C.Thevaluesgivenin
bold type only apply to steam distribution pipes 81-..., the values in brackets apply to the OptiSorp
steam distribution system.
Humidity at inlet
φ1 in %rh
Humidication distance B
N
in m
Humidity at outlet φ2 in %rh
40 50 60 70 80 90
5
0,9 (0,22) 1,1 (0,28) 1,4 (0,36) 1,8 (0,48) 2,3 (0,66) 3,5 (1,08)
10
0,8 (0,20) 1,0 (0,26) 1,3 (0,34) 1,7 (0,45) 2,2 (0,64) 3,4 (1,04)
20
0,7 (0,16) 0,9 (0,22) 1,2 (0,30) 1,5 (0,41) 2,1 (0,58) 3,2 (0,96)
30
0,5 (0,10) 0,8 (0,17) 1,0 (0,25) 1,4 (0,36) 1,9 (0,52) 2,9 (0,88)
40
− 0,5 (0,11) 0,8 (0,20) 1,2 (0,30) 1,7 (0,45) 2,7 (0,79)
50
− − 0,5 (0,13) 1,0 (0,24) 1,5 (0,38) 2,4 (0,69)
60
− − − 0,7 (0,16) 1,2 (0,30) 2,1 (0,58)
70
− − − − 0,8 (0,20) 1,7 (0,45)
Forductwidths<600mmthehumidicationdistancefortheOptiSorpsystemincreasesbyapprox.50%
φ1in%rh: Relativesupplyairhumiditypriortohumidicationatthelowestsupplyairtemperature
φ2in%rh: Relativesupplyairhumidityafterthesteamdistributionpipeatmaximumcapacity
Example
given: φ1=30%rh,φ2=70%rh
humidicationdistanceB
N
: 1,4 m (0.36mforOptiSorpsteamdistributionsystem)
Note:Ifthehumidicationdistancehastobereducedfortechnicalreasons,theamountofsteamper
basicunitmustbedividedbetweentwosteamdistributionpipesortheOptiSorp steam distribution
system must be used. If this is the case, contact your supplier.