daysim manual

8/12/2019 Daysim Manual

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Daysim PSU

User Manual

May 2010

Authored by Richard Mistrick, Ph.D.

Penn State Universit

This version of Daysim is a revision/expansion to the existing Daysim

program distr ibuted by the National Research Council of Canada. These

revisions were erformed at the Penns lvania State Universit Universit

Park, PA, USA under the direction of Richard Mistr ick, and were funded by

Samsung C&T of Seoul, Korea.

[Program Setup: Install the downloadable version of Daysim, then copy the Daysim PSU

1

_ , .


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1

2

StartDaysimbutexecutingtheshortcuttotheDaysimEXE.jarfileinthe

_ .

[1]Tobegincreatinganewfile,selectFILEthenNEW.

[2]Enterthepathandnameoftheprojectheaderfileyouwouldliketouse,

thenclickOK.The.heaextensionisrequired.

TIPInmostcases,itisbesttocreateanewfolderonyourharddriveinwhich

the

header

file

and

all

associated

files

for

this

project

will

be

located.

Otherwise,youwillhavefilesfrommultipleprojectsinthesamefolder.

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1

2

[1]SelectSITEthen LOADCLIMATEFILE.

[2]Selectthetypeofweatherfile,.EPWor.WEA,thatyouhavedownloaded

andhaveavailableforyoursite,thenclicknextandbrowseforyourfile.

Agoodsourcefor.EPWfilesis:

http://apps1.eere.energy.gov/buildings/energyplus/cfm/weather_data.cfm

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1

[1] UndertheBUILDINGtab,selectIMPORTOCCUPANCYFILEtoloadaDaysim

.occfile

that

lists

the

hours

of

operation

for

the

space.

More

details

on

the

structureofthisfileareprovidedonthefollowingpage.

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Anoccupancyfile(.occ)isanASCIItextfile

indicatingwhenthespaceisoccupiedwith

OccupancyFile

Format 1

t e g ts noperat onan stst ese

operatingconditionsovertheentireyear.

Thedaysoftheweekareenteredintothis

fileasMo,Tu,We,Th,Fr,Sa,Su.Thefirst

lineofthefile[1]initializestheyearbased

2

assignedtoJanuary1.

[2] Enterdifferentspansofdatestospecify

occupancybasedonthedaysoftheweek,

withthehoursofthedayrangingfrom024

asshown. Occupancycanrangefrom0to1,

with1indicatingoccupancy100%ofthe

timeduringthistimeinterval. Fractionsof

fulloccupancy

are

applied

to

the

annual

energycalculationsthatDaysimperforms.

3

ay g au onomyan res o

illuminancecalculationswillbeperformed

fortimesthathaveoccupancyof50%or

greater.

,

holidays,mayalsobeentered.

Daylightsavingstimeislikelytobeafuture

addition,butmustbeenteredasachangeto

thescheduleatthepresenttime.

6


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1

3

2

[1] SelectBUILDING,

then

IMPORT

3D

BUILDING

MODEL,

then

select

one

of

the

availableformats.

[2] Ifyouareusingthe.radformat,youcanbuildyourmodelinAutoCAD,then

useDXF2RAD(http://www.schorsch.com/download/dxf2rad/)toconvertthe

polygonsinyour.dxffiletothe.radformat. Itisbesttobuildmodelsas3dfaces.

YouwillthenneedtoaddRadiancematerialdescriptionsatthebeginningofthe

.radfile,orinaseparate.radfile. Withdxf2rad,layernamesareconvertedto

materialnamesbyplacinganl_infrontoftheAutoCADlayername. For

example,polygonsinalayernamedfloorwillbeassignedamaterialnamethat

isl_floor.

Material

descriptions

and

formats

can

be

found

at

the

Radiance

website:http://radsite.lbl.gov/radiance/refer/ray.html#Materials .

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3

1

4

[1] Toimportabuildingmodel,browsetoaddthe.RADfilesforthebaseroom

.

morethanonefileatatimeusingtheCTRLkey.[2] ClickonADDFILEonceyou

havethefilesselected.[3] Ifyouhaveamaterialfile,placeitatthetopofthelist

usingMOVEUP,otherwiseRadiancewillencounteranerrorifamaterialthatis

assignedtoapolygonhasnotyetbeendefinedasDaysimprocessesthesefiles.

,

EXISTINGPROJECT.

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2

45

1

[1] Afterafewseconds,yourbuilding/roommodelshouldappearonthe

screen. YoucanchangetheVIEWPOINTandUPDATEVIEWtoviewthe

modelfromadifferentangle. Ifyourbuildingisrotatedunderthe

BUILDINGtab,itwillberotatedwithinthisview.

[2] SelecttheappropriateIMPORTUNITS,thenselectCONFIRM. Next,

selecttheDISPLAYUNITSyouwouldlikeDaysimtodisplay. [3]

[4] ClickonCREATESENSORtocreateananalysisgridacrossthespace,or

enterthenameofanexistingpointfileunderLOADSENSORS[5].

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1

2

,

graphicimage.

[2] Ifthelayoutisacceptable,clickonSAVEandenteranameforthe.PTS

file. Torevisethepoints,enternewgriddataandclickonCREATEGRID

a ain,thenSAVEtheresultin anal sis ointlocationstoafile.

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1

[1] Toinclude

operable

shading

devices

in

your

room

model,

you

can

change

fromtheSTATICSHADINGDEVICEsetting,whichconsidersonlythebasemodel,

toaDYNAMICSHADINGDEVICEMODEL,wheretheshadingconditionsare

selectedbasedonthedaylightconditionspresent. Youcanentertwoshading

conditionsinadditiontoabasecasefortwodifferentgroupsofwindows.

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1

1 Toaddshadin materialstoa rou ofwindows, ouhavetheo tionof

enteringabaseorOFFcondition,aswellastwoadditionalshadingdevice

descriptionsas.radfiles. TheshadingdeviceOFFconditionwilltypicallyremain

blank,butyoumayalsoenterafilethatwillberemovedfromtheanalysis

modelwhenthegeometryforeitherSETTING1or2isapplied(suchaswhen

thebaseconditionconsidersadifferentblindangle,differenttransmittance,or

differentshadeheight). Browseforthe.radfilestoincludeinthesecells.

These.radfilesshoulddescribetheblinds,shades,etc.thataretobeaddedto

thewindow

apertures

and

include

their

material

descriptions,

unless

these

materialshavealreadybeendefinedinthemainroommodel. Avoidincluding

polygonsintheshadefilesthatwillintersectpolygonsinyourbaseroom

13

.


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1

[1] Thebuilding

model

you

entered

can

be

rotated

under

the

BUILDING

menu. Buildingrotationwillonlyappearinthe3Dviewonthisscreen. All

ot erp anv ewso t espacew sp ayt eroom nanunrotate pos t on,

withaNortharrowindicatingthedirectionofpolarNorth.

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Afterenteringtheroomandanalysispoints,youwillneedtodescribethe

electriclightingsystem. First,selectLUMINAIRES,thenCREATENEW

SCHEDULE[1].

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2 3 4 5

, .

TYPE[2] referstoaschedulelabelforthisluminaire. BFMIN[3] isthe

minimumdimminglevelfortheballastorlampandPOWERMIN[4] isthe

inputpowerattheminimumdimminglevel. Ifastandardnondimming

ballastisbeingused,BFMINshouldremainblank. Includealllightloss

factors exce ttheballastfactor intheOTHERLLFscolumn 5 . Youma

enterasmanyluminairetypesasyouwish.Whenfinished,clickonSAVE

TABLE[6]

,thenclickonLAYOUTTABLE[7]

.

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32 4

1

Inthe

layout

table

screen,

luminaire

locations

are

specified

through

arrays

(columnsandrows)ofluminaires. ClickonADDLUMINAIRETYPE[1] togeta

newentryline. Entertheluminairetype[2],thenentertheX,Y,andZ

coordinatesforthelowerleftluminaireinanarray,thenthenumberof

columnsandrowsfollowedbythespacingtouse[3] . Zspacingcanbeused

toincreaseordecreaseluminaireheightfromrowtorow(movingintheY

direction).Avoidplacingluminairesoutsidetheroom,particularlyinthez

imension. Notet atZspacing ora uminairearraywi typica y ezero.

Luminairescan

be

rotated

within

the

grid

or

the

entire

grid

can

be

rotated

aboutthelowerleftluminaire[4] . Positivetiltraisestheluminairenadirin

thezerodegreehorizontalphotometricplane. Spinrotatestheluminaire

17

.


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1

Controlzonesare rou sofli htin e ui mentthatwillbecontrolledto ether.

SelectthecontrolzonesfromthepulldownmenuintheZONEcolumn[1]. Up

tofourpossiblelightingcontrolzonesarepermittedinasingleDaysimrun. You

willbeabletoturnindividualzonesonandofflateraftertheyhavebeen

analyzed. Differentluminairelayoutlinesinthetablemayrefertothesame

controlzone. Thegraphicimageillustratestheluminairelocationswithinthe

roomanddifferentiatescontrolzonesbythecoloroftheluminaire.

Currently,only

one

zone

may

be

dimmed

at

atime.

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13

2

Aftertheluminaireshavebeenentered,youarenowreadytoruna

simulation. DoubleclickonSIMULATION[1] toviewtheRadianceparameter

settings [2],whichmaybechangedtofinetunetheanalysis. Thedefault

conditionsshouldbesatisfactoryformostruns. SelectRUNSIMULATION[3]

tostartthecalculationprocess.

Forarelativelyfastcalculationtovalidatethatamodelappearstobeworking

andfor

general

tutorial

purposes,

ambient

bounces

may

be

reduced

to

3or

4,

ambientdensitymaybereducedto300andambientresolutionreducedto

150tospeeduptherun.

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1

2

33

,

andwhetheryouwanttostartthecalculationsimmediatelyorrunthem

laterin

batch

mode [2].

Once

the

daylight

calculations

begin,

aDOS

windowwillappear [3]thatshowstheRadianceoperationsinprogress.

Thisprocesswilllikelytakeafewminutes,andlongerwhenmultipleblind

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, .


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1

Whenthecalculationsarecom lete,the ro ramwillreturntothecalculation

parametersscreen. SelectANALYSIS,thenCONTOURS,thenILLUMINANCE [1]to

viewthesystemsperformance.

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1 234

5

Whenthecalculationsarecom lete,the ro ramwillreturntothecalculation

parametersscreen. SelectANALYSIS,thenCONTOURS [1]toviewthesystems

performanceintermsofeitherIlluminancecontours[2],DaylightFactor[3] ,

DaylightingAutonomy(DA),ContinuousDaylightAutonomy(DAcon),orUseful

DaylightIlluminance(UDI)(thesefinalthreeareallavailableundertheContinuous

DaylightAutonomytab[4]).

ThresholdIllumination[5] permitsafullannualanalysisoftheentireworkplane

sensorgrid

to

evaluate

the

fraction

of

time

that

total

illuminance

from

daylight

and

electriclightingiseitheraboveorbelowaselectedtargetpoint. Alltimeswithan

occupancyvalueof0.5orhigherareincludedinthisanalysis. Thisanalysiscanonly

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, .


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1

2

Afterselectingilluminancecontoursandmostoftheothertypesofanalysis,you

willbeaskedtoindicatethedaylightconditiontodisplay. Selectthedesireddate

.

andovercastday [2](clear&overcastskiesarenotyetoperational).

Ifyouhaveentereddynamicshadingdevices,youwillneedtodeterminehowthese

aretobeappliedintheBlind/ShadeControltableasdescribedonthefollowing

page.Ifyouhavenotenteredshadeinformationonthebuildinginformation

screen,thetableatthebottomofthescreenwillnotbeshown.

Ifyou

have

only

entered

asingle

shade

or

shades

on

asingle

window

group

(the

windowgroupsaredesignatedabovebyShade1andShade2),onlythosedata

entrycellswillused.

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33 44 5

61

Ifshadingdeviceshavebeenentered,usethepulldownmenuontheleftside [1]to

settheshadesonawindowgrouptooneofthethreepossibleblindmodels(OFF,

ON1,ON2)foralltimesoftheyear,orapplyoneofthreeavailableautomaticcontrol

strategiestoselecttheappropriateshadingdevice:SIGNAL,ANGLEORBOTH.

e st ato anopenoopp otosensorw c cons erst e a y g t

receivedbythatdeviceunderthebasecase.Aphotosensorfile,locationand

orientation[2] mustbeentered,alongwiththephotosenorsignalthatwillactivate

thefirstandsecondshadesetting[3]. WhenusingSIGNALmode,thefirstsignalmust

bethesmallerofthetwosignals.

ForsolarANGLEcontrol [4],thesolarprofileanglesbelowwhichthefirstandsecond

shadeconditionsaretobeappliedmustbeentered. Thefirstangle(Ang1)must

haveahighersolaraltitudeanglethanthesecond(Ang2).

Toconsiderbothsignalsandanglesindeterminingwhichshadesettingtoapply,a

settingwillbeappliedwhenthesunisbelowtheprofileangleandthelistedsignalis

exceeded. Ang1mustbelargerthanAng2,withnorestrictionsonthesignals.

ELAZ[5]istheorientationofthefaade(itselevationazimuth).South=0, with

positiveanglestotheWestandnegativeanglestotheEast.

24

Afterenteringtheshadecontrolinformation,clickonCALCULATE[6]to applythis

controlalgorithmtothedaylightconditions.


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12

DaylightAutonomyconsistsofanannualanalysistodeterminethefractionofthe

occupiedtimewhendaylightlevelsexceedaspecifiedtargetilluminance[1]. Press

theCALbutton[2] toprocessthedataandrevisethecontourgraphforanew

targetilluminanceentry.Thetimesconsideredarealltimeswithanoccupancyof

. orgreater.

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1

2

ContinuousDaylightAutonomyconsistsofanannualanalysistodeterminethe

fractionoftheoccupiedtimewhendaylightlevelsexceedaspecifiedtarget

illuminance with artialcreditassi nedfortimeswhena ortionofthisvalueis

metbydaylight[1].PresstheCALbutton [2] toprocessthedataandrevisethe

contourgraphforanewtargetilluminanceentry. Thetimesconsideredareall

timeswithanoccupancyof0.5(50%)orgreater.

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1 2

UsefulDa li htIlluminance(UDI)determinesthefractionofthe earthatda li ht

fallsbetweenagivenrangeofvalues.[1].PresstheCALbutton [2] toprocessthe

dataandrevisethecontourgraphforanewtargetilluminanceentry.Thetimes

consideredarealltimeswithanoccupancyof0.5(50%)orgreater.

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1

If ouhaveselectedtoviewilluminancecontours,thenextwindowtoa earis

3

fortheElectricLightSettings. Ifthisisthefirstappearanceofthiswindow,you

willneedtoADDanewcontrolsetting [1]. Youwillthenseeatablelistingthe

electriclightingzones.Initially,controlzonesshouldbesettoONinthesecond

column [2] . Afterselectedacriticaltasklocation,whichwillbedescribedon

thefollowingpages,youcanaddaphotosensortothelightingzonebeing

controlled.

Whenyouarereadytoviewthecontours,clickonCONTINUE [3].

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32 1

6

7

4

5

Thisscreendisplaysilluminancecontoursfordaylightacrossthespaceata

. ,

combination,byclickingontheappropriateboxes [1]. Thecontoursandpseudo

colorshadingmaybetoggledonandoffseparately[2] alongwithacolorbarscale

[3]. EachcoloredboxIntheimagerepresentsthevalueatoneanalysispoint.

Finerpointspacingwillprovidehigherresolutionandsmoothershading,butwill

takelon ertocalculate.Intheu erleftcorner oucanadvancethetime

conditiononestepatatime [4],oryoumaychangethedateandtimemanually

usingtheSETDAYLIGHTbutton[5]

.

Notethatasmallarrowappearsintheupperleftcorneroftheroomindicatingthe

locationofthepolarnorthdirection [6]. Astheroommodelisrotatedunderthe

29

BUILDINGtab,thisarrowwillrotatetoshowthepolarnorthlocation.Dataonthe

shadingdevicesandluminairezonesettingsarealsoprovided [7] .


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3

1

2

Thisscreenshowsilluminancecontoursfortheelectriclightdistributionacross

theanalysisgrid(i.e.,onlyelectriclightisturnedon)[1].

Ifyouwishtochangethevaluesassignedtothecontours,clickonCUSTOMIZE

DISPLAY[2].

Currently,ifyouremovebothelectriclightanddaylightfromthedisplayyouwill

needto

click

the

COLOR

and

CONTOURS

button

after

requesting

one

or

the

other

toberedisplayed[3].

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IntheCustomizeDisplayscreen,settingssuchasthecontourfontsizeandvalues

maybechanged. Dimminglevelsettingsfortheanalysisofthecriticaltaskpoint

mayalsobemodified.

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2

3

5

1

4

Inordertocalibrateaphotosensorthatwillcontrolanelectriclightingzone,

you

must

first

indicate

the

critical

task

point

to

be

used

for

calibrating

the

system. Turnondaylightandallelectriclightingzones,thenclickonthe

.

Next,selectthelightingzonethatwillbedimmedorswitched [2]. Inputthe

targetilluminanceyouwouldliketomaintainatthecriticalworkplanepoint,

thenclicktheCALbutton [3].Contoursofthedimminglevelrequiredfrom

theselectedli htin zonetoachievethetar etilluminanceateachanal sis

pointwithintheroomwillappear,Asmallblacksquare [4] indicatesthe

pointrequiringthehighestlightoutputfromthecontrolledzone. Ifthe

selectedtimeprovidestoomuchdaylight,nocontoursmaybedisplayed.

Youmayenteranilluminancethreshold[5] tohaveDaysimconsideronly

32

pointsthatreceiveanilluminancegreaterthanthisvaluefromthecontrolled

lightingzoneinselectingthecriticalpoint.OpentheCPTool[6] forfurther

refinementandtolocatethecriticalpoint. MovetheXtothedesired

locationandclickontheSETCPbuttontofinalizethepointlocation,which

willturntheXblack.


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5

1

2

Thegrayareaonthisscreen[1] representstheareathatreceiveslessthan

100luxfromzone1sinceanilluminancethresholdhasbeenentered(the

criticalpointwillnotbelocatedatpositionswherethecontrolledlighting

zoneprovidesilluminancebelowthisvalue). Thesquare[2] isthepoint

requ r ng e g es ou pu romzone . enyouopen e oo ,you

willseeawhiteXonyourscreen,typicallyatthelocationofthesquare.

Movethis

Xto

the

work

plane

location

at

which

you

wish

to

place

the

critical

pointusingthearrowbuttons [3]. ClickSETCP [4]andtheXwillturnblack,

indicatingthelocationofthecriticalpoint.Youcaneliminateadditional

33

, ,

usingthemaskingtool[5]. Pointsorareasthathavebeenmaskedwill

appeargray.


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2

Afterlocatingthecriticalworkplanepointtouseforcalibration,selecttheSET4

3

ELECTRICbuttononthecontourscreentodisplaythewindowshownhere.

ChangethecontrolforthedesiredzonetoeitherDIMMEDorSWITCHED [1].

Notethatonlyonezonecancurrentlybecontrolledviaaphotosensor. Forthe

controlledzone,

enter

the

location

and

orientation

of

the

photosensor [2],

then

importaphotosensordistributionfile [3]. Afterenteringthisinformation,click

.

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21

Afterthesensorsignalshavebeencalculated,youarereadytoselectand

calibrateacontrolalgorithm. Selectoneofthestandardcontrolalgorithmsfrom

thepulldownmenu [1],thenclickontheCALIBRATIONbutton [2]tosetupthe

controlalgorithm.Thedaylightconditionappliedincalibratingthephotosensor

isimportantandwillbetheonethatlastappearedinthecontourwindow.For

dimmingsystems,thedaylightconditionmustrequireadimminglevelforthe

dimmedlighting

zone

that

is

above

the

minimum

setting

(BFmin).

It

is

best

ifit

isclosetotheminimumvalue(below50%lightoutput).

Thecalibrationwindowsforthedifferentcontrolalgorithmsareshownonthe

followingpages.

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2

1

3

4

Thisisthein utwindowforanOPENLOOPDIMMINGcontrolal orithm.

5

Thisalgorithmassumesthephotosensorreceivesnosignalfromthe

electriclightingsystematnightandprovidesfulllightoutputatthissignal.

Enterthetargetilluminance [1]forthedaytimecalibrationcondition,

thenselect

UPDATE [2]and

SAVE [3].

You

may

change

the

daylight

conditionusingtheRESETbutton [4]ontheright. Ifthecontrolalgorithm

istoalsoturnthecontrolledzoneoffafteritreachestheminimum

dimminglevel,clicktheOFFCONDITIONbox [5].

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3

1

2

4

5

HereistheinputwindowforaCLOSEDLOOPPROPORTIONALDIMMINGcontrol

6

.

targetilluminanceatthecriticalpointundertheselecteddaylightcondition [2].

Enterthesetwovalues,thenselectUPDATE [3]andSAVE [4]. Youmaychange

thedaylightconditionusingtheRESETDAYLIGHTCONDITION[5]buttononthe

right.If

the

system

will

turn

the

controlled

zone

off

after

reaching

the

minimum

dimmin level,clicktheOFFCONDITIONbox 6 .

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2

1

3

ThisistheinputwindowforaCLOSEDLOOPCONSTANTSETPOINT

.

photosensorsignal[1]thatthecontrolsystemwillattempttomaintainby

dimmingtheelectriclightingzone.Enteratargetilluminanceateithera

nighttimeordaytimeconditiontoestablishthissignal,thenselectUPDATE

[2]andSAVE

[3].

If

you

want

the

system

to

turn

off

the

controlled

zone

afterreachin theminimumdimmin level,clicktheOFFCONDITIONbox

[4].

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2

1

Thisisthein utwindowforanOPENLOOPSWITCHINGcontrolal orithm.

Openloopcontrolshouldhavenoelectriclightcontributiontothe

photosensorsignal. ThedifferencebetweentheOFFandONsignal,known

asthedeadband,canthereforeberelativelysmall. Entervaluesforthe

OFFand

ON

signal

[1],

and

the

desired

TARGET

ILLUMINANCE

[2]to

apply

forcomparisontoanoptimalcontrolcondition,thenselectUPDATE[3]and

SAVE[4].

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2

3

ThisistheinputwindowfortheCLOSEDLOOPSWITCHINGcontrol

14

algorithm.ThedifferencebetweentheONandOFFsignal(thedead

band)mustbegreaterthanthesignalfromtheswitchedzonetoavoid

oscillationsinswitchingcontrol. EntertheONsignalandOFFsignal[1],

then

select

UPDATE

[2] and

SAVE

[3].

The

target

illuminance

[4] is

used

toestablishanoptimumcontrolconditionthatexactlymeetsthetarget

.

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12

Thresholdillumination,whichcanbeaccessedfromtheANALYSISpulldownmenu,

addressestheperformanceofthecontrolsystemovertheentireyearrelativetoa

singletargetilluminancevalueisappliedateachpoint[1]. Thefractionoftimethat

thecombinationofdaylightandelectriclightiseitheraboveorbelowaspecified

targetvalue,indicatedbyeither[2], iscomputedandgraphedforallwork

planeanalysispoints. Sincethisanalysisisforanoperatingcontrolsystem,itcanonly

eapp e o ow ngca ra onan process ngo a g ngcon ro p o osensoran

algorithm.Onlythosetimesoftheyearwithanoccupancyvalueof0.5(50%)or

higherare

included

in

this

analysis.

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1

Thegeneral

performance

and

the

energy

savings

provided

by

the

photosensor

control s stem can be anal zed b selectin ANALYSIS then GRAPHS then

eitherTIMEPLOT,HISTOGRAM,orPHOTOSENSORSIGNALVSDIMMINGLEVEL

[1]. Forthetimeplotandhistogram,youwillbeaskedtoselectadateand

starttimeforthesegraphs.

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1

3

24

systemcomparedtotheilluminanceunderoptimumcontrol(thedimminglevel

thatmeetsthetargetilluminancewheneverpossible).Youcanchangethe

lengthoftheplotfromasingledaytoaweekundertheLENGTHpulldown

menu[1].Anylongertimeperiodisgenerallynotusefulduetothelimitedsize

ofthegraph. Notethatthetimeintervalbetweenpointsonthegraphcanbe

changedusingtheINTERVALpulldownmenu[2]. Inaddition,thedatagraphed

canbechangedfromthecriticalpointtotheaverageilluminanceacrossthe

entirecalculation

grid

[3].

To

display

asingle

day

of

data,

move

the

TIME

to

1:00:00AM[4],otherwisethegraphwillstartinthemiddleofaday.Notethat

abovethetargetIlluminance,ifboththeoptimumandalgorithmsettheelectric

43

g om n mumoro , e um nanceprov e y ea gor mw exac y

coincidewiththeoptimum. Differenceswillappearwhenthedimminglevelis

betweenthemaximumandminimumoutput.


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51

32

4

TheHISTOGRAMoutputcontainsbinsofdataforthetotallightprovidedat

thecriticalpointfromthecontrolalgorithm(blue)comparedtoasystem

thatprovidesoptimalcontrol(green)inmaintainingthetargetilluminance

atthecriticalpoint. Inadditiontoilluminance,thedataplottedmaybe

shownasdimminglevelorlightingpowervalues[1]. Whenilluminanceis

plotted,theilluminanceatthecriticalpointortheaverageofallpointsmay

beplotted[2]. Thelengthofthisstudymaybeselectedbytheuserto

includeeither

aday,

week,

month

or

year

[3] with

the

start

point

being

the

dateandtimeenteredatthetopofthescreen[4]. ClickontheUPDATE

button[5] torefreshtheresultsafterchangingthesettings.Inspaceswith

44

g ay g con ons a se e mm ng eve om n muma arge

fractionofthetime,thetwoconditionswillshowverysimilarperformance.


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ThisgraphshowsdatafortheDIMMINGLEVELplottedoveranentireweek.Youcan

changethedatathatareplottedfromILLUMINANCEtoDIMMINGLEVELorPOWER

INPUTundertheDATAmenu [1].Poorperformanceislikelytooccuratdaylight

conditionsthatrequirealevelofdimmingabovetheminimum.

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1

2

IftheEnergyTablebuttonisselected [1],Daysimwillcomputetheenergysavings

overtheentireyear,monthbymonth. Energyconsumptionislistedseparatelyfor

thecontrolledzoneandtheentireroom(seetabs[2]).Thebasecaseincorporatesno

lightingcontrol. Theoptimalcasedimsorswitchestomaintainthetargetilluminance

atthecriticalpointwithminimalenergyconsumption,whilethealgorithmcase

appliesthephotosensorsignalprocessedthroughthecalibratedcontrolalgorithmat

every meper o . epercen occupancy suse owe g eenergyva uesa

everyhouroftheyearincomputingtotalenergyinalofthesecases.

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2

15

3

4

TheECONOMICANALYSISbutton[1] permitstheusertocomputethesimplepayback

periodandrateofreturnforthecontrolsystem. Thisanalysisisbasedonthefirst

costofthecontrolsystem[2],energycosts[3],andademandcharge[4],if

applicable. Thepeakdemandreductionisassumedtobetheaverageofthelargest

fivedemandloadreductionsatthepeakdemandhour[5] foreachmonthoftheyear.

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