Zonal Models and its applications.

8/18/2019 Zonal Models and its applications.

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Zonal Model

NIVAS BUVAN

03



Introducton

• Varou! "odelln# a$$roac%e! %a&e 'eende&elo$ed and a$$led (or t%e ener#)con!u"$ton* ar+o, "o&e"ent* %eat trat%e te"$erature d!tr'uton ,t%n a roo"

'uldn#!-

• In #eneral* Mult.roo" "odel! and o"$ulud )na"c! "odel! are u!ed et



Mult.roo" "odel

•

Mult.roo" "odel ! a !"$l5ed co""on toocalculatn# ar and conta"nant ec%an#e 'eroo"! o( a 'uldn# and 'et,een 'uldn# anoutdoor!-

• In t%! "odel* t%e ndoor ar &ara'le! are a!!

'e to con!tant n eac% roo"* ,%c% "ae! t%calculaton &er) ea!) to $roce!!-

• But t%e!e a!!u"$ton re!ult! n naccurac)-

Sn#le node



o"$utatonal lud d)na"c!

•

o"$utatonal lud )na"c! ! t%e !ce$redctn# +ud +o,* %eat tran!(er* "a!! tran!(c%e"cal reacton!* and related $%eno"ena ')t%e "at%e"atcal e7uaton! ,%c% #o&ern t%e!$roce!!e! u!n# a nu"ercal $roce!!-

•

! #&e accurate re!ult! ,%en co"$ared toroo" "odel-• !u'.d&de! a roo" nto 10*000 cell! and

"o"entu" and ener#) e7uaton! are a$$led-



o"$utatonal +ud d)na"ccont--

• 8%e "an d!ad&anta#e o( "odelln# ! 98are too t"e con!u"n#:

• !"ulaton tae! !e&eral %our! e&en "an)to do a !"ulaton o( a roo"-

• ;o,er(ul ,or!taton ! re7ured (or t%e"$le"entaton and !o(t,are ! &er) e$e

• And al!o* de5nn# t%e 'oundar) condton! re7#reat e<ort (ro" t%e u!er-



Zonal "odel• 8%e ter"- 9Zonal "odel=* was 5r!t $ro$o!ed '

n %! ;%- t%e!! n 1>?0 Allard and Inard, 1>• Zonal "odel ! a !"$l5ed "odel and t ! t%e

nter"edate o( t%e Mult.roo" "odel and "• It !at!5e! t%e nece!!ar) to e&aluate t%e local t%

co"(ort and ndoor ar 7ualt) ,t%n &arou! @on'uldn#-

• Zonal "odel $ro&de! t%e detaled no,led#e o(and te"$erature d!tr'uton ,%c% ,a! (aled to') t%e Mult.roo" "odel and t ! ea!) to u!e an

!u<er (ro" %#% co"$utaton le "odel-



Zonal "odel ont--

• In t%! "odel* roo" is d&ded nto a nu"'er o( n ,ell."!ot%er"al "acro!co$c @one! (Should obey ConservMass and Energy ) n ,%c% $ara"eter !uc% a! te"$conta"nant concentraton! are a!!u"ed to 'e un(or"

• ro" t%e o"o#enou! @one!* t ,ll 'e ea!) (or t%e u!et%e $ro'le" and al!o ncor$orated nto 'uldn# 8%er"So(t,are-

Zonal "odel



Ma!! and Ener#) Balance

E7uaton



a!! o, acro!! or"aBoundar)

;o,er a, ModelC Non.lnearl) relatn# t%e d<erental "a!! +o, rate-



8%e ar +o, "a!! rate acro!! t%e &ertcal 'oundar)



eat +o, "odelln#

• In eac% %eat @one* t%e +o, ! a co"'naton o(con&ect&e %eat tran!(er and t%e %eat carred ')+o,-

• B) Ne,ton ooln# la,*

• And t%e %eat carred ') t%e "a!! +o, can 'e "a!*

< ' t d



<erence 'et,een andZonal

• 8%e #rd! n t%e Zonal "odel ! not "uc% den!en -

• 8ur'ulence ! not taen nto account-• Mo"entu" con!er&aton ! taen nto account

In !o"e Zonal "odel* ;o,er la, ! ne#lected-

• U!er can $redct t%e ar +o, $attern n t%e Zonaand t can 'e u!ed to !tud) t%e "$act o( roo" ar !u$$l) d<u!er* $artton! o( %e#%t! on t%erco"(ort and ndoor ar 7ualt)-

• 8%e ad&anta#e o( Zonal "odel ! t! a'lt) to '

nte#rated nto e!tn# Mult.roo" "odel n t%e

Zonal Models and its applications.

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