DOCKETED

Docket Number:

15-WATER-01

Project Title: Water Energy Technology (WET) Program

TN #: 205058

Document Title:

Baltimore Aircoil Company Comments on Three Proposals to Meet Objectives and Requirements of the WET Program

Description: N/A

Filer: Patty Paul

Organization: Baltimore Aircoil Company/Larry Wei

Submitter Role: Public

Submission Date:

6/17/2015 8:54:15 AM

Docketed Date:

6/16/2015

• BALTIMORE AIRCOIL COMPANY

7600 Dorsey Run oad Jessup MD 20794 • tel 410 799 6200 faa 410 799.6 5 • w... w.BallimoreAlrcoll.comI

June 15,2015

Pamela Doughman

California Energy Commission

Water Energy Technology (WET) Program

Baltimore Aircoil Company (BAC) designs and manufactures a complete product portfolio that helps our

customers save both energy and water. BAC has three proposals to meet the objectives and

requirements of the WET Program relative to evaporative cooling equipment on both new and existing

installations.

1. Hybrid Closed Circuit Cooling Tower Optimizes Energy and Water Usage

2. EVERTOUGWM Construction Reducing Corrosion and Increasing Cycles of Concentration Thus

Reducing Water Usage

3. Energy and Water Savings Retrofit For Cooling Towers

We appreciate consideration of these existing solutions that have proven to save energy and water and

will also make an immediate and significant impact when implemented. Thank you for your

consideration and we look forward to feedback and questions.

Sincerely,

larry Wei

Director of Marketing

1: Hybrid Closed Circuit Cooling Tower Optimizes Energy and Water Usage

The HXV Hybrid Closed Circuit Cooling Tower has both evaporative (wet) and dry heat exchange sections

that increase the efficiency of the system and allows the tower to operate in a number of modes to

optimize energy and water usage.

Benefit: For San Francisco, CA, the HXV Closed Circuit Cooling Tower will operate dry approximately 50%

of the time. A 900 gpm system will save approximately 500,000 gallons of water annually at

93°F/85°F/78°F design conditions compared to traditional closed circuit cooling towers.

!iuimlllll' HCh Temponbft Procon f.-l 0lbDw 1BO"f

Wa Clns II

fil1llell and Tn II!

COMBI ED WETIDRY ODE: TIl,s m. ~lIIplo)'S lhe lI\ll aI Qaln ClIIl~ tile dry finned ClIW and Ute prune s~rtate coo VIa eo' is SPI1l'jOO wertlle prime mta.-e COII.I IIifltalDl1t!lll C IInrl0 oct1Jr. belil1l! rallllll o~er the" II. furttlet cooIln& tile spray ler

ENEFITS: Pruv d~ tOO m9 C CIt; byell1pkl~nr l1euseof IXltll co\l$ V. er 11 sm<1

In InlS me as t efinned, IJ cOIl. red~CES tile amo 01 at 1~31l1ee:lls

Qbe rejeded In lhe prone surtn (lIlFlow 1lmU&lt I wet (lid ClIO Iso bii artmlled ancLlllj012d as bien I peRfure andforllellllOild!hils

ADIABATIC MODE: -_. ttt ...·,....;;-~ ..!III.-iii..i'·__~~

BE EFITS: PrtJMes J mkll1lecapa::lttranre WIlen aut ide lemperallJre.s ,nat at for d cctili. arClns 10

D Y COOLING MODE: nIhls lode, tile ,p' er " tUmed ~!.

t he cooled " cmll~led l/1T'l \flll<:th III

8clth colis rec2iYe full ulillllll8 m

BENEFITS: He' tel ClIISl1Ilp!ioo IlCClI$ in lilis mllllll and p .1,,,, lIed. This;, b·!le rnodeullll"'llUondunnr

Wa rCo

----

HXV First Cost Benefits

HXV Operating Cost Benefits Due t[; I Swa·Er s4V1ng o:n:epl and QlfTlblned design. the HXV olli!rs SlRflrtlCaIll

Otlel3tmll cost benefrtl. Yi.lter consumption IS mlmmlZl!d til ughoul rhe \'l!:V, Dunng peak summer operallao a large amount of heat load IS anady ransfP.rred by Iw

oned COIl. t amblenllernper re andtOf heat ioa(j droIls. tne amount of e'i3paal1'le heal transfer 15 furt!loi r1!du~ by CIIl'\TQjlmg tile fbw thlOulin Ire M!t

COIl This leduc the l!\I3pcr"~01 kJ" lid bPw.«J.m as well as .... lei' Ir'!.llme!lt

requirem~ntscompal'f(j con lltiooal eYilpclati· cooling fQUlpm!fltln n adiabatIC mode only asmall amount of ....teI IS needed to saturate tile air and tilt amoun of blow-dawn 1$ ralIad ~n furthel. Finally In th! ty modi: no water IS

used al all (wmlle saYIng the eIlfI&V as\llClJlfd tn running he spra PlIl1P) With HXV hibnd un~s, er savings p10 70% as compared to traditOJ I closed cin:ult

~vstems IS pass ble Dependllg on local water cosls and a llab , thiS advantage

alol1l:' can pay for he "'lull/ment as Ii as two \'l!a1S thrau hcost Sd\Im~ 0

water u \'rater treatmenl dBl1Ical . and hlgb!!! tern !!IfJcieOCIl!'S. In addi lon,

fouling pctential mocialed with Oll"" cm:uit CllllIing towers IS elmioJted iJlIDugh both the closed loop coolmg s~tem and 1he Combmed Fb¥ Technoiog;' des1i" at the

HXV, 8ssunng peak effiCiency and enErgy Sc1VIngs over time. Fmally. the mduced draft propeller fan design resul In low fan nergy requJremenlS compared to centnfugal

ian units

D~-lIIllbDIlIeIll1tI YmlIS Clillall Zan.

A" W.,.., H"t!, ,. '111~··1'.1111"~

Closed Circ~ Comllng SyS1eI1lS oller lhl lowen FlUid Tern eratrres

• o

D'" AtaMA'nt;

.~,.......

Typical Annual Dlstr1~11ll1lf Allblenl Temperature with the Three operating Moilils

2: EVERTOUGH'" Construction Reducing Corrosion and I creasing Cycles of Concentration

EVERTOUGWM Construction combines SAC's 'innovative corrosion-protection features to allow for higher

cycles of concentration that reduce water usage due to blowdown compared to standard materials of

construction for new evaporative heat rejection units, !,neluding open circuit cooling towers, closed

circuit cooling towers, and evaporative condensers, Additionally, reduced corrosion leads to reduced

leakage and wasted water. Benefit: Doubling the cyeles of concentration from an industry average of 3

to 6 will result in 20% in water savings. A 300 ton system wi I save approximately 200,000 gallons

annually.

What is BAC's EVER OUGHT Construction? EVERTOUGHTV Construction combines OJ number of BAC's innovative corrosion procection features in a single cost-effective package.

TrtArm C~n Protection System

PfRP CornpcY.ltl! Pan

"

Component-Specifi Protection Cold Wor r 80l'n Protene<f w

COInIs'on ProtKtlon Syn m TnArm Thermol tt/n

Mem~n

Hyl>tfd Potym r Prorected Structural

PFRP Hot Wot r Olltnbu Ion 8GsJnt (S M s lOOOJ

pv Spray 01 r1&urJon IPn,VCAI • r

I've FTII

FRP COlIn

Plies

Pan Is ond Lou

(PT2)

3: Energy and Water Savings Retrofit For Cooling Towers

Cooling tower energy and water efficiency for the existing stock of evaporative heat rejection

equipment will increase through various feature upgrades. This is analogous to retrofitting mechanical

equipment with variable frequency drives (VFDs), or inspecting and maintaining economizers on

packaged rooftop units to reduce energy usage. Incentives to encourage feature upgrades and retrofits

will yield the most immediate and largest benefits.

ENDURADRIVE™ Fan System Retrofit- a belt or gear-drive motor/fan assembly will have inherent power

transmission losses by design. The ENDURADRIVE Fan System retrofit kit is a direct-drive solution that

includes a new mechanical support, a new direct-drive fan/motor assembly, and a custom-programmed

VFD, eliminating power transmission losses associated with gears and belt systems.

Benefit: 10% energy savings by eliminating mechanical losses from power transmission components.

PAPER 0: TP05·1S

CATEGORY: FANS

COO ING TECHNOLOGY INSTITUTE

RECENT DEVELOPMENTS IN MOTOR TECHNOLOGY ALLOW DIRECT DRIVE OF

LOW SPEED COOLING TOWER FANS

ROBBIE MCELVEEN BILL ARTIN RYAN SMI'TH

BALDOR ELECTRIC

_ ...... "'" = CocIn; .ct>nc*>qy """""I C ~A.I"lD"tO i· .Fel::ln.larvS-t~~

_ ThTROD C 10.­

The moSt c= solunou for drivmg the fan Ul C1.l.<rent rooting (0\1;(1 ~~ u1lhzes :m induction motOf. dri\"tsll:\d disc couphng and geartlol; :uTal1!!~I, as. >hoWll in f >.gW"~ 1 F ch:lng' to this deSign h;n'.. ~ ulJde 111 the l\ 'enry em-

The ll'.c of \'. bk Y 've" ) !l.l" b« m mmore eGIllIuonpl.1 111 ree . 3 Da from 3 UO ed coolmg 10 '~wanmacrurefUldu:alts th3 VF ;; are bong lIIStIlled III the lll3J<Wi. of all ~\\'

10WelS ~mg conslIt 1M _ ddilionaIly. mOSI 10\\'= beinl! up~ or refurtllsbed arc abo bemg ~ \\itb VFD Thelie drives M""" !be advantage of d soft mechJnlcal no Urge, g (UlTCIlt diiw md tllr abihly t run the an desJted d fiom zm 10

the m:t.:wulIllllkslg,l spted f(X" tilt 3pphc.1 I) I3J The energy S3\"Ut.gl. realized bv usim! 3 ,,'FD are 11: ell r~ an dOCUlJlL'nkd.. so ~ fmth,n- dl.5CU >ion will be ' hm 1 Sevnal f3C11l1"S that must ~ c ed' en app')' g a VII> = any cmicaJ spttd!. of mechan1cal C5 ~l. e oollng abtl _' of the mduCUOll mOtM 31 10 - ~ aM thi: pr~

!t.lbnC2tiOO f g arbo 31 slow ~ For prxtia1l ~ fUI' et=:I1ly not ron :u below 30". of ' al 'gn;peed.

Hislorially the mech< 'cal COfIllOll 0 1M f3D dm'" ~ on. ~i:fically the nght ;mgre g-ead!l:lx. ~ bcc:Il the m~ nuin:en.mce . f coo u-er IIIS"~ - [-) Gearbox" . ures.. 0t1 e.~ ail CODI:lIlllIl;WOO bile<! dnw shaft>.. mis:I.h. d1we.

3Dd exc ...~ \lbrabOll are a.ll -!il mmC2DI

prob rda~1I 10 s f f;m \-e syUel1l (6] II

_ ]MPRO\"E IS _ MOTOR TEC~OLOGY

--

conrrol as men iIS ~t Imlmal pmormm::e ami COSL ha\~ ~-erdy~ lISe Doe 10 Ie

impro =lelIIS 1IlOI~l1C and lhenn.1l propnti of P ~ 0 '!f the pmt _0 featS ',y! lQU<, p~

013 DOW ~. allemali1,l"S Figures _ $:: 3 5110\\' /ptca1 e~ ;md ~ tletor.\ for \<:Irious D1'Jtor types [8}.

l-··~~-·

I

/ ,­

/ / --­.... -.-.~ . , ­

, ,

~

o

Figure 2 - Typi~1 P~rtl Load Effic!encies of 75 HP. TEFC. 1800 RP Motors

=: :co ,­

----.

...... --0­ I

r I'

",.I'

;

100 III

Figure 3 - Typical Partial L(),)d Power F~ctors of 75HP, TEFC, 1800 RPM Motors

.~tz innov:nion which mmts discussion is the 1a=1<!'d frame molor t«hll.ol~~ m this destgn. Lan.unal<!'d fuuu., morors eonstst of J tack: of laminaliom ~. ri\~led Ulll!t:f conrrol!.ed pressure The c:lSl iron outer fr:lme is elimin:ued. .11 owUJg more room for 3d!'.-., (lCl'qUC produculg) ma~ lIl3lerial F_ c" btlow is 3 rqn=ration .IDO'i'ang bo . me lQl' fJ'anlI, IS COlIS <!'d.

Figure 4 - U1mlnated Frnme Construction

.-\noth~ adV;mb~e of this coll5lrucnQu is ib:Il the illl' ~ cool the IllOlIlr r; m dlreCl contact nth tile e~ical steel. There l, no lhl!mlill relistlnce path as that Whleb e'til in a traditional GIst iron frame wit COIll3Ct to the or laIJr; The heat er nxdI:uusm In troD. tiame trolQf is Illghly ~t upon :e St3IOl' I mme IiI. I...;iIlIUI3 frame COllSTIUCllon e~tes tlns ISSIZ.

In =r y= lnduslry' dm~ ha\~ forced tht de-\..,Iopmmi of au oplUD:I.Ud. . \amw:ated motor doeslgJl. To l.lIIpwye coolmg md Ulcre35e po\\'er deuslry 6n.s h.we been ~ 10 the exterior of me

ator l:uuiJlariollS ~ addi 'on of the optinuzed cool fuIs ~ the su1face area a -aLIa Ie for he:! disstpa 'on. The remit IS IIIIpfO\'ed heat tr.msfer and a power UlC'l'e3Se of 20-! 5% IS typical f...'l a given lamination diamel~ and C~ length, Figure; bows the ~ 5Urface area achieved bi' including these oolmg fins.

Figure 5 - Fjnned \/S, Non-finned lamination

It is thIS impro,,~ cooling method. aloug \\1th I e effi~y and power fie or aclllC'\'cd ....ub the

PM logy that allows for increased po. 'er densi;:.· m Ihe:sc molor dt$lgn; Po~ dcn£1 1$ the k~ f r bring ab e 0 IIl3lch tbe be1ght restnetion of the exISting

g=OO:\ For a paper STUd)" " 10 ~. tht appl1l.XJJU:l e

\=' mo for III 11 r art shOI 11 III T bk 1 bdow The Will!! b~ ~'cr I .08 tp1l Uch motor ~~ dt51l!Md Or ~ ~n~ ­

Figure 6 - Onglnal Installation

T.1ble 1 - Motor Sin Comp "50nS

m CA'E~TL"D

Tht GISt srud\' lIl'

coo1lru1 at 'ef" c ed Unr. - Sourb CJfohm

foll

18 -{)"

Flo . (G~r

hfCll1Da1KlD Fnmt - 3~

HP-50L: $pt-ed - I 65 : rpm

Ge.art:oo. '

LocariQU VoLls. meaIl

Amix> =

lnpUl kW

Power Facror~')

InpUlIO fnducnon 4 46.7 3\ ­ g .7

Input 10 VFD,PM

477 <H.~ ~8 - 76

Input to ~

4j9 .JO.9 ~8 0 86 \

Tilble 2 - Power ConsWT\ptlon Comp;lrlson. Ong,";'! blade pitch. milnut.1eturer dotll

From tills data tl ~ del=umrd thaI both .lis \\'eT'l'

= at to:!» tb;m full load and that !he load should ~ on each cell. To tlns end.. !he pilch of !he blades on eac,h Em w;r; IIIl:!'e:I.'ied ro I~ ~

of pilCh caur;.ed f3ns 10 dn . more ;ur. ltws Lllcreasmg !he load on ~ch n1Dlor FUfltrt lI:L~

increas.ed au Ilow i.u:Jprot.'t'd 1M ~tRctt\'eIles.s of lIle o\~ ower perfu= .4.pin. power ~ \l\~ ~ and a p;lll}' oestul,g mlCe was m~ to =Uy !he mam.r:facrurer's

r '. The dati is shaII"tl III abies j & 4 ~1Qw.

L~on Volts, -~. InpulkW IDI:aIl nus

Inpul lo lru:hIc1iDn

'In 8 38.\

Inpwto VFDPM 4 I 49 53.6

Table 3 - Power Consuptlon COmpilriSon. 12" blilde pitch. milnllfaeturer dilt.:l

Location Volts=.n Amps rms [npUl kW lnPUllO lnducnon

478 5,U 3 ,9

lnpu! to VFDPM 477 49.8 330

Table 4 - Pow r Consumption Comparison. 12" blilde pitch, testing se ce diJ'til [9]

for ~ fulaj bl3de pilch. 4 5 . 1= power cOIISUDI:ption was obsen't'd on the c~lI wilh the P. { molor 1Illll2ll.~. In order \) documenl ~ S3\'in,gs neahz~ at ,'aliotL5 ~ on ibis :zppliarian. inpuI power W3S rccOIdcd at ~e ~ for thr PM DlOIor ceIL F~ 8 below S If> acruaI ~

inpUl power for !he UIductton DlO'or ~l( solution aDd !he P 1lD>lor solution atl.'arious ~.

..... : ...1--------.7,,'-----­.-+-------:-",-L-----­

:+.1-_-_-_--------:::'

Figure 8 - Input Powe V5. Speed. 12" blilde pitch

•.<\.s shown in Tab 2-1 !he PM IOOlor solution require; kss .1IlpUl power for each load II1l ~ PilCh) FlguR 8 soows lb~ lotll inplll power m k1Iowal15 for each solutton O\"er a range of ~ling~ from 50­

()()"r'. ~~,!be PM motor !las an OO~ ntlgt O\~ !he rndt:cllQIl molor leartJolt sohmon. Using; an a~-erage pnc:c Qi .. OS lcl,Vh. !he cost s;n,-mgs for \dfI0US

appucaooo:; and duty cydes are shov.'U m Table:). Tlus table does not ilCCQUI1l for me ;;ddl. onaI savings adu~-ed bv 1ISUll! a VFD and !Ln'inl! the abilirv lUll

at ~~~ ~~ -O"~ and 100'. of~t~ .

.-\mImI Sa\"1Ms (".HJ.h Sum'"ol.c';: 5~ed)

Application Dally r;~

100 0 75 ,­ 50 50

Po....orPlmt 24 llrs S3154 ')2488 S18n HosP1taJ IS Ilrs, S2365 S1866 S1367 vwvcmr,' \ ~ Ilrs SIS77 SI2M .,911

T~le 5 - AnnUillEnergy Silvings Bilsed on Vanous Duty Cycles

1\' ELECTRICAL CO)/SIDERATIO~S

PM CObltol AIgonthm In addition to lI:Le P.:{ llll) or dtsign fearures already ~ anotber challenge of Ibis applicahOO Wi\:; Ih,ll the ~ lIIOtor had 10 be run semodc:ss. ~ was DO room to install a speed -cedbad: <k\.;ce. sucb as <II

encoder or = 'er and SIlIl ~I e ht'ighI restricnon of !be existrng gearoo. [n ibs harsh en 'l.'C!lllIlCIl a f~.k de\'lCe u'ou!d be a liabili as fur as rcitalllli j

I conamed. Th~forc. a ~ P),1 COIllIO.

scMme was dt-vdoped to S3IlSf'}' ttu: ~en1ClllS oi !his appllcallOll. Se\;'er:JI things had to be cOIlS1dcred when fOf!lling this algorithm. Oneball~e was the merna of tilt Thts wa5 laJr,;en mlo accounl 0 ~=:r me LUOlor from fallmg OUT of 5) chrowsw

1

Wh~l ~ and dl:In~ ~ f- e 9 15 a on of 3. typl al ran from res.1 _ 0 e'!be smoo'

a ~IO"a 10 low ~ • curr~r r lure-,i .~• . 'jllcal .!.SO valt Ulducl'01l IllOlor st3l1e-d 3. 0 .e ~

'ould dr3\\ 3 .uups 10]. cOlllpJfed 10 12 amps f r tills P).J &es1~ 'il:ul~ on the ~

I· MSor ..."t.bQIt - ........~ "'~14!!91 .·

I:;; f.. ·

/ · /

~~ / eo

/ / ·1

J~ / ):

/1,./__ ..

. /

- -.. - ­. - '--1,l!>II

Fig e 9 - otor St ng Perform:lnce

----e~..~ - :-.... - I--..1 - ­! .\ - ­

'"'--~.:.--. ' --"_./ -1h ::~ ~......::.

~

h I -1 I"·a -

'" .,. .. ., .'. - ".­-FI e 1 tor Spee-d on C ; Hut Lo:1ld

S tnckk l llTml ;lliQ 3.CIS a:. :l.ll eruaJ by r.lWllg the W1Ddm. <:DJPO"'lllR. candensauon w en lilt IlltltOf is nOl n

losuhll1on S;'> em Inside e fan stlck IS an e. tr~ldy III 'd em'!r ICnl. ~cre. the !Il5II[anon tOll on the 1 'or \\ lh~

mU;T be robust and !>jEbl, moisture resJ tall To tIus an lIl5Ula S)':sr~ denwd from J S)''Sltm

ongm..1Uy dt\'doped. for use by tile ·S. av'Y was emplO)~d. Thi5 . an epo~..}' compo app1Jtd \'i:i a '::lamrn p unpregnanon;P system. The \1'1 SYSleln 1$ wide!. recognIZed as a superior msulallOD ~ystem for harsh apphc nons such as this. 'partirnlz ''j'St= has beell SUCttSSfully employed on -~- molors ll1 ough appu a ODS sucll as oil pia oons ~fUlg In the . . Se...

V. MECHA:'ICAL 0 'SIDERATIO 'S

Shaft Seal Due to the h.U'5il mvrronmenI inlltrent u1Ill coobn$' IOU'ef" app :c3J'i e- motor'"s drive end' pfOlteted by a lCIalllt. an-i:on1actlllg. 1lCll' -e . _ pt'.fDlJJlent rompomd bb)'IUI >ll3ft s.eal l!lcoqxua' a 'apOf

b . g JIll!! preven m mgress of mo1Sl'U:'e.. This. seal .:11 been pro\.=! ex ;lll:pes of be,aruu; cmt:lIDi:llatJOIl and nrets ~ rfOquiranems of~ IEEE·

841 motar sptafirn an for 5("\"e!"e _. apphcanons I)~ of ~ ba5 hem suee y used III coolmg

tower ge~ far mllIj' -t'.:')[';! 111_

e \ CD can p qde ~ . k1e CIllTeIll ttl lr.l tbe mtor '~t a mpo!r.IlUre sh!!htly abo... ambteoI 10

pr,~venl tllOL,>IUR' fortwng mslde the motor.

'Imtlon

With the eliminatton of the blgh ~ to gearbox. Sj"Stml. dj. from a ~"lbr.mon

·>t;tudpoml ha\ bttn imp~ ~ au no. = any resouaDl:e LSSUO WIth the dnv~ ne maximum rotillLOll3. aGWlOll IS 11tlVl' . :e11 I) me rotlllonal ~ of tbr fan- ~ IJ.lIIIbcr (If bearin!!, in the dlwe ~ It:a- bttn reduc~ from si." 0 ,'0 for a swgle rrduchon gen'bo-x am from cighl 10 Iwo for a double redoc1lD!l ~x llus reduc~ ihe !lWlIber of fon:U1g ~:teS pr= in the ~

N ise eve :\tm.· cooling lowers are m oca OIlS where .!bon ooi:.e can be 3D 1S5lr. such as hOSJllttls am tIlIi" .:ties. To this end. a IhmI - g companv was engaged to coaduc ompar.I' ..... sound csts bmJ,'een the '0

ce115. D ""'as tlken ;}. both !ugh spte<l and low speed for both cells. The Ulducnon molor cell ...as dl!slgJlo1ttd as CeU F'1 ""'bile the PM I1J)TOr ell was I' ted ~'

Cen #. Sound leve. ~Is W I? on Cell =1 wtule Cell ,,2 was llued off TheJe \\~ :el:e 30­secood readings takm ax !ugh speed and ,\-elye 30· second teading5 t1ken at ow speed around I

perin:Jder f [he tower 3lIlI the fin motor. As lh.."'fe W<lS no moror out5ide of the fan stad: OIl e.u =2- on!" nine readmg. were t1ken on C~ =2 \\"Ith Cell;=\ ~ oiL .• wgIe point ~suremenI was taken where the old . OIl motor was OWlted on Cell ;=2 in rdcr [0 have some reference 0 Cell ;; l. II was DO possw TO IUlll 0tI ~ "I\..ter w for eubel: cd.! ax allY tlllIe so here W35;1 si¢= 3IlIOunl oCbackground noise, but

as this onditio' was ihe 'i3I:Ir for bot cells. it o;hould not aff~ the c m:p:n;u:i\,. data [9]. A\'erage .-\­welghl~ sound pr=u-e results are showll in Table 6 for both high speed and low opcr.Ilioa

A-wei,l!h[~ A.\'eT.l£e Cell HWIStxed I Lm>'Soeed IndUcnou Sl.3dBA I NAdBA

77.7dBA I 69 0 dBA~

T:lble 6 - So nd Pressure D:lla

A! high >peed. ~ PM rna r ~1I was is dBA lower than the mductiOll mo or cdl For lal\" ~ operation 1M PM lIlOIOf cell VI'aS :'i 4 dBA lower. Although ~

m:ty be ~ slight dl.ffere:ncts m the b3d:!!Jound ~

for each ceU the!.t iJRlv do nOI accOUIli fa! all of the fiObe 1e\.'e1 redut1i0l1 iealacd "'ith the P:\1 IDOlor ~lubOll. The removal of the blgh speed iWu.ctloo

1 'or from e OUlSlde of the fan stl£k appezs 10 ha -e

the In e;t influmce ou ~ nOise Ie -el f h~ rOWfi

Itself

"I CO~CL ·SiO :,

Cooltng ower fan drwes bave !lallgtd \l~f)' Imt over pas! '0 decades fai IIf!S of th'e ge<Utox.

dn.-eshaft. or disc coupl.ulg· biI'ie 1Joeeu me bllPg:esl relia.b' .' L>Sl:Je flci:Dg lower lUJIlufa lUl"er~ and end UStn lttcrea-~ melID" =;5 have placed a prmuUUl OIl po'o,-er Ul!:;umpllo fur aU IllDlors and applications.

Many of the problems 3SSOCLiIted with cooling o\o\-er ~ and re1i4btliry are so 'eel wilh me P I

!Of design. The relati-.-ely high speed ( •pi . I 50 rpm) mducbon motor has been eliminated The m tor ilSdf Ins [IQ storu:al1} been a problem. but a.55OCia-td = and pote:lIlIal nbra on concerns h;m~ been L»Ue. drt>eshaft and 3>SOClaltd d <

coaphngs have beOl reDlO':ed. thus e1unlD.1W1!l problems associated \mlt misal( t im ropef ubrication. oatur.ll frequencies. or deiammatiwz of the

ivesb.aft il If (11) The righ ang e iral-bewle.d gearbox !las been remO\i\l!1. Dlfficull mamten:Ulce a.'iSOCIat~ with changing me oil. proper oil fill I~-els,

conlamination of the oil. oille.al'. Mel gearbox f.lt1ure IS I 0 OlIger a coocem.

~w moror technology no.... pro,ide-; an altema Ive solubon. tbe <hrect dn...,. of coolu1lr to",,:er fum P 1 mot echnol.ogy ~"Ombi.ned w· th~ fumed. laJ:mnared fuuue design oow allow:; tlle collStruetion of low speed. CompXlll1010!> fur ~ w place of the e.'\i~riug gearbox. D3ta t1iucl 0 date indlcate:; this solution WlU

el1ul1l\3.te the problttlls associated with the .at 3D" e gearbox and dri~,. :>haft design. 3v e~ting the gearbolL whicll I.~ 3 sJgllifi.;m ~m of 10 ~ the systOll. unpro\'td S} em clIictencies can be rea1.lzed.

\11. ACKKOWLEDGE. 8.1'

The aulbors f this per e:'."Iend tbe1r thank t C emson UIU -ers' i aIld Tov.:er ~. Inc. for thell" ContnbUllons and paniClpal.lOll !!l the P~OJec

\lII REFIRE, CIS

[I) Benjamin Cohen .. -ari.able Frequency Dm"l"S Operauon and AppllCOlllOll ...1m EvapoJanve Coolmg Equ!pm.', Cooling Tecl:Inology

Me Paper _TO IP07-2~.1.007

I.] .tIl.i.1lll F. Im~e.lL -Varulble Speed Fan Dffies for ooling Towers-. Coo.ing Te llnolo .' Instltu e Paper)/o TP96-0_'. 1996

New High Efficiency FiII- replacing scaled or clogged fill with BAC's high efficiency fill kits are designed

to increase the energy and water efficiency of the cooling tower

Benefit: 7% to 10% energy savings. Up to 5% reduction in water usage by reducing the amount of scale

and build-up that requires additional cleaning, drainage, and blowdown along with less splashout and

drift.

Nozzle Replacement - broken or clogged nozzles causes uneven water distribution over the fill, scale

build up, and decreased efficiency.

Benefit: 2% to 3% energy savings. Up to 5% reduction in water usage by reducing the amount of scale

and build-up that requi1res additional cleaning, drainage, and blowdown along with less splashout and

drift.

etrofi Opportu les

A2°r Dec e sa in Lea 'ng Water Tempera esa 6%' Elec ·city Costs

0. PlfICI1III1Y1I: Irs:- mas 2S~ " J 1lrIidiIII"s .1ectridIJ. 11m ~ iBl:raa ill cuIiIIc Ilnm 1uri111Rbf ~tDn 1riI r!SIfI D ~ IICI&tr man ClSI1I

Annual Cool" To er EJ1iclency S ving

Re ace azzles

P;y Back PellDd: lm Ulan I Yw

entsceUD21'3de or R

1-rF Decre2Sl! 111

Pay Back Penod: ~ tnan ! Yea

malnltatrl Ule peak pt'r1 om Inceol y(lUJ

Pay Back Penod: 2-3 Years