Phng php lm mt t nhinKhi nc bay hi, khng kh xung quanh tr nn mt hn v m hn. Qu trnh lm mt t nhin ny khng cn bt c mt ngung nng lng t nhin no t bn ngoi cung cp. Tm lm mt CELdek ca Munters ch to ra da trn nguyn l t nhin .

H thng lm mt bng nguyn l bay hi:

Mt h thng lm mt bng nguyn l bay hi to ra hi mt hiu qu bng cch kt hp qu trnh t nhin s bay hi vi h thng thi gi n nh. Khng kh trong lnh t bn ngai s c y qua nhng tm lm mt c lm t, qu trnh bay hi xy ra v lung khng kh c lm lnh c thi qua khng gian nh xng bng qut. H thng lm vic nh th no Nc c cung cp thng qua cc ng nc ti cc tm phn phi nc nm bn trn cc tm lm mt. Cc tm phn phi m bo s cung cp nc ng u ln ton b tm lm mt. Qu trnh bay hi xy ra khi khng kh kh v nng bn ngoi i qua tm lm mt. Nhit lng cn thit cho qu trnh bay hi ly trc tip t khng kh nng bn ngoi. Khng kh sau khi ra khi tm lm mt c lm lnh cng nh lm m cng lc. Nc cn d khng tham gia qu trnh bay hi s c dn ngc tr li bn cp nc nh h thng mng nm bn di tm lm mt. Hiu qu lm lnh cao m t thit k c o ca tm lm mt do hng Munters ch to, chng ta s ly loi 7090-15 lm v d in hnh. Mt tm lm mt c cu to bi nhiu tm cellulose c dng ln sng c lin kt vi nhau theo nhng gc ln sng khc nhau. Tm cellulose th nht c gc nghing ca ng ln sng l 60 v tm cellulose th hai c gc nghing 30 . Chnh nh cu trc cho gc 90 (60+30) gia hai tm cellulose k nhau nn khi gi thi vo tm lm mt s c s tip xc cc mnh vi b mt ca n to nn s bay hi mnh lit. Kt qu l tm lm mt c hiu sut lm mt cao cng nh gi thnh r v thn thin vi mi trng.

Lm m hiu qu Cc chuyn gia ca chng ti pht trin mt lai vt liu cellulose c bit c kh nng thm ht cao dng ch to tm lm mt CELdek vi tnh ht nc mnh trn ton b b mt tip xc ca tm lm mt. Vi tnh cht c o ny, n c th hp th mt lng nc ln v cho php phn tn nhanh nn gim thiu hin tng nhiu nc ra ngoi nhng vn gi c m cn thit.

Tui th cao Kh nng thm ht cao cng lm cho vt liu tr nn cng hn v gip vt liu n nh hn trong cu trc ca n. ng thi n m bo hiu qu trong vic chng li kh nng mc ra do nc v gi tc ng vo. Tm lm mt c thit k c gc nghing 60 theo hng thng xung di vi hng gi i vo. Do nc c chy theo hng gi vo nhiu nht nn to ra s bay hi mnh lit nht, ng thi cng lm gim thiu s ng cn trn b mt tm bay hi. Kt lun: Tm lm mt c tui th cao cng nh chi ph bo tr thp. CELdek, s la chn cht lng. CELdek l tm lm mt c cu trc nguyn thy. N c sn xut trong hn 30 nm qua vi s n nh c chng minh v khng c i th. CELdek c sn xut theo tiu chun cht lng ISO-9001. La chn CELdek chnh l s la chn hiu qu v cht lng.

Hng dn thit k - KhLm th no tnh tan iu kin khng kh sau khi qua tm lm mt v t l bay hi. Chng ta c th ly v d sau y Lng gi q Chiu di tm lm mt L Chiu cao tm lm mt H Chiu su tm lm mt D Lai tm lm mt 720 000 m3/h 100m 2m 0.1m 7090-15

Hng dn thit k - NcTrong h thng phn phi nc, c 5 yu t v lng nc c nh ngha nh sau theo minh ha di y. E = Evaporation (lng nc bay hi) B = Bleed-off (lng nc x) F = Fresh water (lng nc sch cung cp cho h thng) D = Distribution (lng nc cung cp cho tm lm mt) P = Pump capacity (lng nc bm ln) Tnh tan lng nc x B tnh tan lng nc x B, bn cn phn tch ngun nc cung. Ty thuc vo cht lng nc

iu kin mi trng xung quanh: Nhit khng 40C kh kh, t(idb) Nhit khng 19C

kh t, t(lwb) 1. Tnh tan vn tc gi: v= v= q L H 3600 720 000 100 2 3600 m/s = 1.0m/s

ta c hng s cB c tm thy biu di y. Cho rng ta c mu nc phn tch nh sau: pH Bicarbonate concentration HCO3 Calcium concentration Ca2 71 200 mg/l 20 mg/l

2. Xc nh gim p p v hiu sut n T biu ca pad type 7090-15, n = 78C and p = 9 Pa vi v = 1.0m/s 3. Tnh nhit khng kh kh t(2db) t(2db) =t(1db) t(2db) =40 n t1db - t(1wb) 100 78 (40-19) 100 C =23.6C

Theo th cht lng nc hng s cB = 0.2, do lng nc x B c tnh nh sau: B = cB E = l/min B = 0.2 99 = 20 l/min Tnh lng nc sch tiu th F nh sau: F = E + B = l/min F = 99 + 20 = 119 l/min Tnh lng nc cung cp cho tm lm mt D c c m cn thit v tm lm mt hat ng ti u th phi cung cp lng nc nht nh cho 1 m2 b mt trn cng ca tm lm mt. Lng nc cD cho nhng lai tm lm mt khc nhau CELdek nh sau: Pad type Lng nc cD trn m2 b mt trn cng 7060-15 60 l/min 7090-15 60 l/min 5090-15 90 l/min

iu c ngha l khng kh c lm lnh 16.4C (t 40C n 23.66C) 4. Tnh tan lng nc bay hi E Xc nh im nhit khng kh kh t(1db) = 40C v t(2db) = 23.6C trn ng nhit khng kh m t(1wb) = 19C Xc nh c lng hi nc v sau tm lm mt x1 = 4.9g/kg v x2 = 11.8g/kg V sau tnh c lng nc bay hi E : E= 1.2 q (x2-x1) 1000 60 1/min

Lng nc cung cp D cho tan b chiu di c tnh nh sau: D = cD L D l/min

1.2 720 000 (11.8 - 4.9) E= 1000 60

=99 l/min

V d: CELdek pad 7090-15 L = 100m v D = 0.1m cho ra: D = 60 100 0.1 = 600 l/min Tnh tan lng nc bm ln nh sau:

P = D + B l/min P = 600 + 20 = 620 l/min

Tm quan trng ca vic x nc Lng nc x ra khi h thng l rt quan trng. Nu x qu t th cc cht khang cng nh cn s ng ln tm lm mt rt nhiu v phi thay pad thng xuyn. Nu nh x qu nhiu th s rt tn nc. Do vic tnh tan lng nc x ti u l rt quan trng, tnh ton hp l s ko di tui th ca tm lm mt cng nh t hiu qu s dng cao nht.

CELdel, Type 7060- CELdel, Type 7090- CELdel, Type 509015 15 15

CELdek Cooling PadEach cooling pad type is available in standard heights and depths. The standard width is 600mm. To understand the ordering key in greater detail let us take the type 7090-15 as example. Type 70(flute height,mm) 90(sheet angle, deg.) 15(bisector angle, deg.)

CELdek Water Distribution PadThe distribution pad has a special angle arrangement to disperse the water and thus ensure a uniform supply of water the cooling pads. In this wayl, the risk of dry spots that may occur i case of an uneven water flow is eliminated. A distribution pad is always advised. The distribution pad has to be ordered by itself and is available in standard heights and depths. the standard which is 600mm.

Ordering Key (Cooling Pads)CELdek XXXX-XX Type 7060-15 Type 7090-15 Type 5090-15 -H xD xW

Ordering Key (Water Distr. Pads)CELdek 70120 Height, mm Depth, mm Width, mm -0 x xD xH W

Height, mm Depth, mm Width, mm

Standards heightsH,mm 30 50

Standard heightsH,mm 500 600 900 1000 1200 1500 1800 2000

Standard depths, see under cooling pad.

Heights of cooling and distribution pad If distribution pads are used , do not forget to include the height in your framework.

Standard depthsD,mm 50 75 100 150 200 300 7060-15 7090-15 5090-15

= available in these depths

Cost Saving of Ventilation Cooling SystemProduct Area Measurement : 48m x 25m x 2.5m = 3,0003 x 2 = 6,000m3 Equipment : Fans Water Pump Remark : 12 units x 1HP : 2 units x 2HP : 1HP = 764w/hrs

Ventilation Cooling Ststem Cost Calculation

Case 1 : Production is assumed to be 8 hours x 26 days a month

Monthly electrical consumption Fans Water pump Cost Water consumption Cost : 1HP x 12 x 764w = 8,952w/hrs = 8.952kw/hrs : 2HP x 1 x 764w = 2,984w/hrs = 2.984kw/hrs : 11.936 x 8hrs x 26 days x 0.258 = RM640.54 : 36m x 1.5m x 1.3 litter= 0.0702m3 : 0.0702 x 8hrs x 26 days x 2.24 = RM32.71

Monthly water consumption

Cooling Factory Area with 220HP Air ConditionerMonthly electrical consumption for 220HP air conditioner Cost : 164.12 x 8hrs x 26 days x 0.258 = RM8,807.34

Utility SavingUtility saving per month : RM8,807.34 - RM640.54 - RM32.71 = RM8,134.09 Utility saving per years : RM8,134.09 x 12months = RM97,609.08Case 2 : Production is assumed to be 10 hours x 26 days a month

Monthly electrical consumption Fans Water pump Cost Water consumption Cost : 1HP x 12 x 764w = 8,952w/hrs = 8.952kw/hrs : 2HP x 1 x 764w = 2,984w/hrs = 2.984kw/hrs : 11.936 x 10hrs x 26 days x 0.258 = RM800.67 : 36m x 1.5m x 1.3 litter= 0.0702m3 : 0.0702 x 10hrs x 26 days x 2.24 = RM40.88

Monthly water consumption

Cooling Factory Area with 220HP Air ConditionerMonthly electrical consumption for 220HP air conditioner Cost : 164.12 x 10hrs x 26 days x 0.258 = RM11,009.17

Utility SavingUtility saving per month : RM11,009.17 - RM800.67 - RM40.88 = RM10,167.62 Utility saving per years : RM10,167.62 x 12months = RM122,011.44