Condair EL2 - Notes for the Planning Engineer; Selecting the Unit Version; Calculating the Maximum Required Steam Capacity

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4.1 Selecting the unit version
Themaximumrequiredsteamcapacitymustbecalculatedbasedononeofthefollowingformulas:
 V•ρ 
m
D
=  •(x
2
- x
1
)
1000
or
V
m
D
=  •(x
2
- x
1
)
 1000•ε
m
D
: maximumsteamdemandinkg/h
V: volumeofsupplyairportionperhourinm
3
/h(forindirectroomhumidication)orroomvolume
tobehumidiedperhourinm
3
/h(fordirectroomhumidication)
ρ: specicgravityofairinkg/m
3
ε: specicvolumeofairinm
3
/kg
x
2
: desiredabsoluteroomairhumiditying/kg
x
1
: minimumabsolutesupplyairhumidityin g/kg
Thevaluesforρ, ε, x
2
and x
1
canbegatheredfromtheh,x-diagram or the Carrier-Diagramfor
moist air respectively.
Important notes:
– Therequiredmaximumsteamcapacitydependsonthespecicapplicationandtheinstallation.
Thecalculatedsteamcapacitybasedontheaboveformulas,theh,xdiagramandtheconditionof
theairtobehumidieddoesnotconsideranysteamloss(e.g.duetocondensationinthesteam
hosesandthesteamdistributors),anyheatlossoftheunitaswellasanyabsorptionorrelease
ofhumidityofmaterialslocatedintheroombeinghumidied.
In addition, the calculated steam capacity does not consider any losses caused by the draining
ratedependingonthewaterqualityaswellasanylossesoccurifthesteamhumidierisoperated
onamainscircuitwithagroundfaultcircuitinterrupter.
Thetotalamountoflossesdependsontheentiresystemandmustbetakenintoconsideration
whencalculatingtherequiredsteamcapacity.Ifyouhave
anyquestions
regardingthecalculation
ofthesteamcapacitypleasecontactyourCondairsupplier.
– Forsystemswherethemax.requiredsteamcapacityvariesextensively(e.g.fortestfacilitiesor
forsystemswithvariableairvolumeow,etc.),pleasecontactyourCondairsupplier.
4 Notes for the planning engineer
Toselecttheunitversionthefollowingplanningstepsarerequired:
1. Calculating the required maximum steam capacity according chapter 4.1.1
2. Selectingtheunitversionfromthetableinchapter4.1.2
4.1.1 Calculatingthemaximumrequiredsteamcapacity