Cotes CR100 - Principle of Operation

Page1
Thedehumidifierremoveswaterfromanairflowthrough,and
theremovedwateriscarriedawayfromthedehumidifierwith
theregenerationair(henceforwardcalledreg.-air).
Wateradsorptionand-extractiontakesplaceinanrotormade
ofwaterresistantsilicagel.
Theairflowsinthedehumidifierdividestherotorintwo
parts:dryingpartandreg.-part.
Twoseparateairflowsgoesthroughtherotorasthis:
-themainair(moistairinlet)goesthroughthedrying
part,andleavesthedehumidifierasdryair
-thereg.-aircomingfromtheoutsidethroughtheinternal
hosetothereg.-airfan,goesthroughtheelectricPTC-
heaterandwillbeheatedto130C(at20Cinlet).
Goingthroughthereg.-partthisenergywillbeusedfor
evaporationoftheadsorbedwater.Thewatervapoursand
thereg.-airnowleavesthedehumidifierthroughthereg.
-airoutlet(seepage2,fig.2).
Thetwoairflowsarefixedandtherotorturns-thisgives
anautomaticprocessofsimultaneouswateradsorptionandwa-
terextraction.
Theinletconditionsoftheairtobedried,determineshow
muchwaterthedehumidifierwillremove.
Onpage8thecapacitydiagramshowshowmuchwaterwillbe
removedperkgairgoingthrough.
(showninthediagramR617)
-inletairconditions20C,60%RH,giveswatercontent8,7
g/kg
-thediagramshowsthendryairconditionofX=3,9g/kg
-removedperkgairisthen:8,7-3,9=4,8g/kg
Dryairflowisnominal100m3/h=(x1,2)=120kg/h
Capacity,removedwaterperhour=120x5,0=600g/h
=14,4kg/24h
-at230V.
Thetemperatureofthedryairishigherthanfortheinlet
air.Thisiscausedbytheevaporationheatreleaseandheat
gainfromtherotor.Thetemperatureisshowntobe42C.
1.PRINCIPLEOFOPERATION.
CAPACITYDIAGRAMR617.
Example:
CapacityofCR100atthiscondition: