Cotes CR300 - 1. PRINCIPLE OF OPERATION; CAPACITY DIAGRAM, R618

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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airflowsinthedehumidifierdividestherotorintwo
parts:dryingpartandreg.-part.
Twoseparateairflowspassesthroughtherotor:
-themainair(moistairinlet)goesthroughthedrying
part,andleavesthedehumidifierasdryair
-thereg.-aircomingfromthereg.-airfan,passingthe
electricheaterandleavestheheaterwithatemperature
of135C.Thiswarmreg.-airnowgoesthroughthereg.-
partandtheenergyisusedforevaporationoftheadsorp-
edwater.Thiswatervapournowleavesthedehumidifier
withinthereg.-air.(seeprinciplefig.1,page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)
-inletairconditions20C,60%RH,giveswatercontent8,7
g/kg
-thediagramshowsthendryairconditionofX=3,2g/kg
-removedperkgairisthen:8,7-3,2=5,5g/kg
Dryairflowisnominal300m3/h=(x1,2)=360kg/h
Capacity,removedwaterperhour=360x5,5=1980g/h
=47kg/24h
-at400V.
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,R618.
Example:
CapacityCR300atthiscondition: