NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1000-30-i!-830 SeptemToer 2k, 1953 2813

ESEFORMAJMCE 1ESTS OF A TRION

EIUCTRIC AIR FILTER

'oy

Thoraas W. Watson

and

Henry S. Robinson

Heating and Air Conditioning Section

Building Technology Division

to

Corps of Engineers, U. S. Army

Office of the District Engineer

Galveston, Texas

<N^

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publlcat lole or In part, Is prohibited

unlesspermh Approved for public release by the .ofStandards, Washington 25.D.C. Si Director of the National Institute of oh a report has been specifically prepar Standards and Technology (NIST) :uiar report for its own use. on October 9, 2015.

icigrosRMAiiCK 7ms or a thxc^ elsctbzc axs Fumi

l9y

timma W« Vm%am tod Umxrf S« ^e^Uaim

1* ismmmm

At ttm r&quMt of th» Oowpa of WagAoi^n, U» s* Azmr* Offleo of

tho Siotilot fiagiiioert i3olve«toa Sistslet, QoIirootOQ| Teaea* (i^oi^oe

lofetor tetod Ats&»»t S7g FUm taata «m mOa to

dotoxii^UM Va* porf^foosoo of oo *’E3Lootarlo Air GiMOior*' OHSufOeturod

by Trioo^ Xsooryosmtod^ Soeka^ ^nonylvoaio.

flio op«eifl<»Ktloa roqoirMN^to th& Coainr*

^

EagiiiMre o«r«

•totod in tlio tost os foUovst ”7hs yrooi^totors sboll bo

of tbs froysr typo «aA also to olooa ths spoeifiod voiiaw of Mr oith

an afftoiooey c€ mot loss tban 9^ W tbs 9* S« Boraan of standards

Sisaoloratida Hatbad of fast and ttm r^iataiieo to Mr flov Mall not

aiai^id 0»f0 ** ¥• &• at too f|si fa<^ raloMty.''

a. or TIBS ASH ci^ai^

Tbs elaansr sas aamsfaetarod by frloa, Im*, of ^seKasa Booka^

lOQO Zalaod AracHia^ PanaaylvaMa^ and ana of tb« slaotsoatatle typo.

Xt ana idantlfisd nansplata aa a Tri<»9i Blsetrie Air Flltsr^ mM.

7«X0a«00 C • iwrlal 1S31T 115 rolts^oyolsa*

Tlia bad aotiaal otital^ dinnttaioaa of

^x l/k as^ aea

at laobaa long (erosa^aaetloaal araa of sail aaelosors 3.71 ft^)«

Tbs upatarsan and doanstreiai faosa wars flnrad out forMag flaiagsa

30 inabaa a^uars ao that t^ unit could ba fitted into tha test

appara^ia. Tba doaastrsaa fb^ of Ms oMt URia boused to rscMvs a

neMnal SO x SO x 1 or £*iiiob aftsr^flltar. Tbe bcHiaing opaMag had

not diaNBsaiona of iS 5/l5 x IS $/llS tadisa. A SO x SO x 1 iaab

Bsaoerob Prodaota HF ^OS air filter ina used aa the aftar-filter In

these teats.

the aanufaeturar furnished an adhesive dealgaatad aa 'Trioa

m, 363"*^^ and aa afflieator tor oUii^ the eollaotiag plates of tha

call by spraying than froa tha upatraasi faoa« This uaa done la

praparatioo for tha testa by a r^prasaatativa M tba oanufactoror

Mo aaa proaant during Me testa* Tha poaar padk^ connected to a

115 rolt 60 eyela su^ly^ aaa adjusted by the aamifaeturar's r«pra»

oaatatira to a setting of X*1 mllllaisparaa 00 tha poeer paok tnatm*

oantf tha lonitar and Mate valtagea that raaaltad eare aaaaurad by

aeana of a MM raaiatanee voltaatar uMeh uaa ooa^arad vith an

aoeurate alaatroatatle voXtsMttor*
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V^ §i%j£-.tC4^w iStm; m a»£mr i^.44<-n£m't

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3. issf imm> Asm mocmim

B^ffieiCQoy detendxwti^me wmdie

^ tkm XBS DiMtt l^etsgsd^

uaing outiSocnr air Srawik tbr&uglsi tba XaS^ratory Mittimt addition of

othor doat or ooniaaiitiBit. fho test aetlK^ is deseribed la t£w ps^er

’'A 1S?est Mstbod Ibr Air FUters^' Isy B« S, BiU <AWI ?misaoti09^»

Vol. kk, p, 3T9# 1^^)*

For t^itm testa, tl» Moa oait sbs iastaAiod ia tbe test dust

sad oarefuliF sealed to previ^ laXeslsaie of air. Tbe desired mts

of {dr flov tbs air oXssaer ms establlsbsd, and ssapies of

air mrs drava fro® polzxts Of» foot upstrsse sad el^t feet iigfm^tvmsi

of tbe air oleaner at e^iml rates sad passed trough e^^ttaX areas of

vnsstmn m, hX filter •pmp&r {%/k-^is^ diit®ster spots). fi»

ffsiiTilff ms drsm eostlau^i^jalF test| opstmefs ms

dram lotsstdtte^tly is a isadber of sIk^ periods ui^oraXy distributed

<mr tbe durati<^ of Vm test, S4^gressti»i^ on«*t^tb of tbe domstreaa

ssospliag pt^od. uader these eotsditioas m sffieieQey of 9D peroest

muld be ladieated if upetraaa m& dsmstrem dust«spots o»

^

filter papers liad tlie mm opaeitF, as measured, by the isiorease is

the opasitF of tbs filter paper deteradned by eeans of a photoaster

using trenecitted li^« If^

QipmS.tlm of the dust spots ddffer,

an approadaate mlue of the efflcdensy oexi be caloulated by aes»s of

the fonsula

^flcieaoF • 10© (»

peroeat.

there Op end ^ are the opa^tiea of the dust spots deieistreaa aaA

upstraea, respsetivelF, sad the fsator 30 is ^itevnliied % the ratio

of

^

demstream sad upstreesi ampHog periods.

The mit sa si;^«ltted hsd p3jsatie«liipreF;sated glass flh^ ebsets

2P a IS a 1/S io^ in sise hetmea the eoUeotix^ pistes aod the

housing, at ^le top and at the bottom, to laeu3;ate the plates from

the housing. The asaufaeturer rsqueeted that SS x 17 SA x lA iaeh

Sheets of glase be used in lieu of

^

glass fiber shmts. The glass

sheets mre suhstittirtMtd for the original sheets end used for all the

tests givstt in ^s mgoet.

t. tiaf mmtM

A sumranry of the test data t^bteiaed ia tests <»adu«ted at rates

of sir floe eeirespwndiiig to various fast veloeities (based on a face

area of 3*71 ft^) ie gtma in the tehle belov* It eas Observed that

throughout these tmts there me no iastaaee of eleetrloel tigoeMm

or flaeidUis in the unit audible to the ear*
• v*?i^ %,r«3t?<^ ^i# ^4^0&4‘i?C^ rfC£i8« «£ 4st»3g4>s;*«rs»-«!^ -64^^ m^-i

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ft*!? .tjfaft'' :i«?5 .'ll : fcite!«&£t- ntr.
TcO>Ie X

face

velocity

Zonisar

Voltage

yiste

Voltage

fresaure

&rop

Otisnstixm of

test Efficiency

fm SV Ito w«a. Minutes percent

15*1 T*3 0.09T lao 95.1

333 13*2 T.ii •207 lao aa*2

333 15.0 7.3 .207 ISO 68.1

ilOO 15.0 7*3 .5^5 I60 ^*3

koo 15.0 7.3 .2^5 200 83-3

mmm

fls» eftietmany the eir eleas»«r i& errestlag exi«t«st

tixt «lr drstn the t&ait depeaadad to o mtlusA 4ogree &n the

faee velocity »t tdiieh it esee o^emted* Xn ^sts ecmseetionj^ the

eechifeoturer ** ri^^seotetivee ett«i2iSe& the teuete stated that l^aey

teXieved the pgomfmm% efeeiiieatloa the air eXeaaere at

OeXvaataa ealXed to ^ toe velocity of about 533 ft/«io.

lathar thaa t<K) ft/nda*

the efficieaeiea are reporto to three slgaifleimt figuree

obtained toa the teet data* Xa reportiag thus, howiv^, it is

somldoT&d dseixuble to point ^»xt that ea t^soertaisty cm the mrCmt of

about 2 pexeeat is poaeihle in det«rsd.idjig i^fieiemies, aXthod^ the

c^vioua differeaeee appeariag In the results ate of lesser aa^oltude,

Tim saeasure dtep throui^ the t^st mit vm sli^tly 0preat«r, at

3^ ft/a^ face velodity, than is helle^ad to he required by the

speelfi^ttoi* fhe {tn^sure throng the ’<mit i^th tl»» after«filt«r

removed vns weaaured as 0«0t9 iaeb b» 9* at about 3^^ ft/min toe

valoeity* fhs greater part of the preesuse drop of the o^^dete ^aiit

vae duo therefore to the resistahse of the e^ter-fllter. It is

believed that substitutlsm of m (i^ter^fllter of loeer resietaaee eotild

not eauae a slgaifiamt ehaage in the doat-arreetlag efficiaasy of the

csoe^lete unit*

toedbis the c^mrae of some of theee testa, an operation involving

tho szediag and sieviag of coarse concrete aggregates ves in progress

in an axes ad^wNsat to the buildisg in idileh the air cleaner teats

sere oade. Some duet eas relsased into the atcanspbere by this procese*

Sovever, ainee tha ^enexal breese dlrsetion eao aivsy from to air

filter teet building, and the air draun into it for the teats entertad

thrott«d& a large uindxnr on its remote aide. It is believed to air

filter tests were not dgnlfloantly affected* The length of tlaa re- quired for obtaining suitehle dust spots is further evidacee that to

air reeeived at the teat unit eas not, in ganaral, unusually eostolaated.
41

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