Specifications

13
4 Basic planning
Condair GS 80 C G20 RS
1. Requiredmaximumsteamcapacity
2. Required combustion gas
3. Combustion air supply
4.1 Selecting the unit
Theselectionoftheunitisreectedinthetypedescription:
4.1.1 Calculatingthemaximumrequiredsteamcapacity
Themaximumrequiredsteamcapacityiscalculatedfromthefollowingformulas:
 V•ρ
m
D
=  •(x2-x1)
1000
or
V
m
D
=  •(x2-x1)
 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,x2andx1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.
Note:Toroughlyestimatethecalculatedmaximumsteamcapacityforlargersupplyairportionsor
room volumes, the values listed in the table can be projected accordingly.
Max.portionofsupplyairinm3/hrorroomvol-
umetobehumidiedperhourinm3/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
5000 6600 8000 40
10000 13200 16000 80
15000 19800 24000 120
20000 26400 32000 160
25000 33000 40000 200
30000 39600 48000 240
Example:
Max.portionofsupplyair10000m
3
/h,
temperature/rel. humidity of supply air
-15°C/90%rh
Condair GS 80 C G20 RS