Свеж въздух

Freshairinlet

Freshairinletlocation

(1)Itshouldbelocatedinacleanoutdoorplace,andthecontentofharmfulsubstancesinoutdoorairattheairinletshouldnotbegreaterthanindoors30%ofthemaximumallowableconcentrationattheworksite.

(2)Whenarranging,keeptheexhaustventandtheairintakeasfarawayaspossible.Theairinletshouldbeplacedontheupwindsideoftheexhaustoutletasfaraspossible(referstotheupwindsideofthemainwinddirectionoftheseasonwhentheinletandexhaustareusedatthesametime),andtheairinletshouldbelowerthantheexhaustoutletfordischargingharmfulsubstances.

(3)Inordertoavoidinhalingoutdoorgrounddust,thebottomoftheairinletshouldnotbelessthan2mawayfromtheoutdoorfloor;whenitisarrangedinagreenbelt,itshouldnotbelessthan1m.

(4)Inordertolowertheoutdoorairtemperatureinsummer,theairinletshouldbesetintheshadeofthebuilding,onthenorthwall,andavoidontheroofandwestwall.

Други изисквания за нови въздушни изходи

(1)Theairinletshouldbeequippedwithshutterstopreventrainwaterfromentering,andtheshuttersshouldbefixedshutters.Inrainyareas,waterproofshuttersshouldbeused.

(2)Inordertopreventbirdsfromentering,metalnetsshouldbeinstalledintheblinds.

(3)Forcentralizedsystemsthatusealargeamountoffreshairduringthetransitionseason,itisadvisabletosetuptwofreshairoutlets,oneofwhichisthesmallestfreshairoutlet,anditsareaiscalculatedaccordingtotheminimumfreshairvolume;theotherisanewairvolumewithvariableairvolume.Theareaof​​thetuyereiscalculatedbysubtractingtheminimumfreshairvolumefromthemaximumfreshairvolumeofthesystem(thewindspeedcanbelarger).

Freshairunit

Главна функция

Themainfunctionofthefreshairunitistoprovideconstanttemperatureandhumidityairorfreshairfortheair-conditionedarea.Thecontrolofthefreshairunitincludessupplyairtemperaturecontrol,supplyairrelativehumiditycontrol,antifreezecontrol,carbondioxideconcentrationcontrol,andvariousinterlockingcontrols.

Структура

Thefreshairunitiscomposedofafreshairoutlet,asupplyairoutlet,afreshairvalve,afilter,asurfacecooler,ahumidifier,andablower.Thesensorsusedmainlyincludetemperatureandhumiditysensors,differentialpressureswitches,andantifreezeswitches:actuatorsincludefreshairvalvedrivers,electrictwo-wayvalvesthatcontroltheflowofchilledwater,andblowers.

Принцип на работа

Outdoorfreshairentersthefreshairunitthroughthefreshairoutlet,andthefreshairunitwillfiltertheincomingoutdoorairtofilterouttheparticulatedustintheair,andthencooltheair.Afterdehumidificationorhumidificationtreatment,thetreatedcoldairwithsuitabletemperatureandhumidityissenttotheair-conditionedareathroughtheblower.

Thefreshairunitisahorizontalstructurewithahighheatexchangeperformancecold(heat)exchanger(surfacecooler)andalow-noisefan.Thehorizontalfreshairairconditioningunitdoesnothaveitsowncoldandheatsource.Wheninuse,theairpassesthroughthefilter,andtheniscooledorheatedbythecold(heat)exchanger(surfacecooler),andthensenttoeachroombytheairduct.

Afterthefreshairunitintroducestheoutdoorfreshairandperformscoolingandhumidificationordehumidificationtreatment,thecoldairwithsuitabletemperatureandhumidityistransportedtodifferentroomsandareasofthebuildingthroughtheairsupplyduct,andsentoutfromtheairsupplyoutlet.asshowninpicture2.

Thesupplyairtemperaturecontrolandindoortemperaturecontrolofthefreshairunit

1, контрол на температурата на захранващия въздух

Ifthefreshairunitismainlytomeetthecleanandhygienicairintheair-conditionedareaTherequirementisnottocarrythecoolingloadorheatloadoftheair-conditioningarea,anditisnecessarytocontrolthesupplyairtemperature.Inthesupplyairtemperaturecontrolmode,thesupplyairtemperatureisalwaysmaintainedtomaintainaconstantvalue.Ofcourse,thesupplyairtemperaturehasasummertemperaturecontrolvalueinsummerandawintersupplyairtemperaturecontrolvalueinwinter.

Therefore,itisnecessarytoensurethenormalconversionofthecontrollerinsummerandwinteroperatingconditions.Thecontrolmethodoftheairsupplytemperatureofthefreshairunitinsummerismainlytoimplementcontrolbyadjustingtheflowofchilledwaterinthecoil;inwinter,thecontrolisimplementedbyadjustingtheflowofhotwaterinthecoil.

2. Контрол на вътрешната температура

Manyairconditioningareasrequirefreshairunitstobeabletocarryindoorcoolingorheatingloads,whichisreflectedintheneedtocontrolindoortemperature.Sincetheindoorcoolingloadorheatingloadisalwayschangingdynamically,onlytheconstanttemperaturecontrolofthesupplyairtemperaturecannotmeettherequirementsoftheindoordynamicloadchange.Itisnecessarytocontroltheindoortemperature.Thespecificcontrolmethodistodetecttheindoortemperaturethroughthesensor.Andinputthetemperaturesignaltothecontroller.Ifthetemperatureishigherthanthesettemperature,thecontrollerwillgothroughthefollowingprocessing:usethedifferencebetweenthedetectedtemperatureandthesettemperatureascontrolofthechilledwaterflowingthroughthecoilorThebasiccontrolparametersofhotwaterflow.Whenthedifferenceislarge,theopeningoftheelectricvalvethatcontrolstheflowincreases,andviceversa,theopeningdecreases,increasingtheflowofchilledwaterorhotwater,thatis,increasingthecoldorheatThesupply,andthenrealizethereal-timecontrolofthetemperatureoftheair-conditionedarea.

Fromtheperspectiveoftheannualoperationcontrolofthefreshairunitandconsideringtheoperationofthetransitionseason,thecombinedcontrolmethodofthesupplyairtemperatureandtheindoortemperatureshouldbeadopted.

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