Condair Mk5 - Page 11

11
3. Calculating the maximum required steam capacity
Themaximumrequiredsteamcapacityiscalculatedfromthefollowingformulas:
V • ρ
m
D
= • (x
2
- x
1
)
1000
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.
Foraroughestimateofthecalculatedsteamcapacity,thefollowingtablecanbeused.Thevalues
listedinthetablearebasedonadesiredroomairtemperatureof20°Candadesiredrelativeroom
air humidity of 45 %rh.
Max.portionofsupplyairinm
3
/hr or
roomvolumetobehumidiedperhourinm
3
/hr
max. steam
capacity
in kg/h
Temperature/rel.humidityofsupplyair
-15 °C/90 %rh -5 °C/80 %rh 5 °C/60 %rh
650
1000
2000
2500
3000
3750
5000
6250
7500
10000
850
1350
2650
3300
4000
5000
6600
8250
9900
13200
1000
1600
3200
4000
4800
6000
8000
10000
12000
16000
5
8
16
20
24
30
40
50
60
80
Example:
Max.portionofsupplyair3000m
3
/h, temperature/rel.
humidityofsupplyair-15°C/90%rh
or
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.
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 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supplier.
Mk5 Visual VE 24-400V/3~