NGHIEN CU'U-TRAO D 6 |
NGHIEN CO'U THLTC NGHIEM CAC Y^U T 6 ANH HU'dNG CHE DO LAM VlEC C O A THltT Bj LAM MAT BAY HQI
EXPERIMENTAL STUDY FACTORS AFFECTING THE PERFORMANCE OF EVAPORATIVE COOLING SYSTEMS
Nguyln Thfi Bao', Nguyen Bao Toan^ L6c Chac Hoang^
'Vifin Phat trifin Nang lugng Ben viing ISED
^Trudng Dai hgc Su pham Ky thuat TP. Hd Chi Minh
TOM TAT
Nhdm gidm phu thugc vdo mdy lgnh vd diiu hoa khong khi truyen thong dang sii: dung mdy nen vd tdc nhdn lgnh CFC hay HCFC, thi viec nghiin ciru vd trng dung thiet bi ldm mdt bay hai thdn thien vdi moi trudng vd tiit kiim ndng lugng Id cdn thiit. Bdi bdo trinh bdy nghien cuu thycc nghiem moi quan hi giira lieu lugmg khong khi Q^ luu luang nuac Q^ hiiu sudt tgo dm rj, ti so luu lugmg nuac vd khong khi E den hiiu sudt ldm viec cda thiit bi ldm mdt bay hai. Bdi bdo cUng nghien cuu dnh huang cua cdc thong so noi tren den hogt dgng cua thiit bi ldm lgnh bay hai a cdc nhi^t do nuac vdo khdc nhau, cdc vdn de ndy chua dug'c de cap a cdc nghien cuu tren the gi&i. Tir do bdi bdo de xudt cdc thong so phit hcrp cho thiet bj ldm mdt bay hai img vol dieu kien khi hgu dm Vtet Nam.
Tir khoa: Ldm mdt bay hai; Bay hai true tiip; Bay hai gidn tiep; Dieu hoa khong khi.
ABSTRACT
In order to reduce the dependence on traditional refrigeration and air conditioning systems using CFC and HCFC refrigerants, the research and development of environmental friendly and energy saving evaporative cooling systems are necessary. This article presents the experimental study in the effects ofairfiow rates Q^ water flow rates Q^ humidlfication factor rj, the ratio of entering water and airflows E on the performance of evaporative coolers. Thepaperalso investigates the effects ofthe above mentioned parameters on the effectiveness of evaporative cooling systems at different water temperatures that has not been reported before. Then suitable parameters of evaporative cooling systems in humid climates like Vietnam are suggested.
Keyword: Evaporative cooling. Direct evaporative cooling. Indirect evaporative cooling, Air conditioning.
ISSN 0866 - 7056
NGHIEN CLTU - TRAO D6\
1. TONG QUAN VE LAM MAT BAY HOI Nu'dc
nhau, bao gdm 2 loai: Loai chu ddng va thu dgng.
Theo cac thdng kfi, cdng suat dien tifiu hao cho he thdng difiu hda trong cac cdng trinh nhu: Cao 6c van phdng, khach san chiem tir 45-55% tdng lugng difin tifiu thu [1]. Mac du hifin nay cd rat nhieu he thdng difiu hda khdng khi dugc cai tifin nham tifit kiem nang lugng nhu hfi thdng difiu hda tnmg tam cd luu lugng nudc, luu lugng gid thay ddi theo phu tai,...
Trfin CO sd hifiu chinh nang suat lanh sat vdi phu tai thuc te, tuy nhifin cac he thdng nay deu sir dung nang lugng dien. Cac he thdng dieu hda ndi trfin dfiu phai lam lanh ca nhiet hifin lln nhifit an, ma lugng nhiet an thudng chiem tir 20%-60% tdng tai nhiet ciia he thdng. Thuc tfi, tdng nang suat lanh tuy loai cdng trinh van phdng, nha hang, sieu thi, difiu kifin thdi tiet bfin ngoai.
Cd rat nhifiu nghien ciiu trfin the gidi ve ly thuyfit va thuc nghifim cdng nghe lam mat bay hoi cho dieu hda khdng khi [2]. Theo Duan va cgng su [3], nfiu he sd lam lanh COP ciia cac he thfing dieu hda khdng khi su dung may nen tii 2 dfin 4 va may lanh hap thu tii 0,6 dfin 1,2 thi COP ciia he thdng lam lanh bay hoi la tu 15 den 20. Lam mat bay hoi cd the dugc chia lam 3 loai chinh: (i) Lam mat bay hoi true tifip (DEC: Direct Evaporative Cooling);
(ii) Lam mat bay hoi gian tiep (IEC: Indirect Evaporative Cooling) va (iii) lam mat bay hoi kfit hgp (Combined DEC/IEC). Hinh 1, chi ra su phSn loai cac hfi thdng lam mat bay hoi dang dugc nghifin ciiu va img dung hien nay tren the gidi.
Lam mat bay hoi true tiep (DEC) la loai lam mat lau ddi va don gian nh4t, trong dd, khdng khi ngoai trdi dugc tiep xiic true tifip vdi nudc. Ky thuat nay da dugc sit dung hang ngan nam trudc vdi nhieu hinh dang khac
He thdng lam mat bay hoi trgc tifip loai chu dgng it tdn kem nang lugng, tifit kiem len dfin 90%, hieu qua ban udt cd thfi d^t dugc 70% -80% [4], tromg khi dd thi he thdng lam mat bay hoi true tiep loai thu dgng cd thfi lam giam nhifit do khdng khi khoang 9''C [5].
Bagia dofn mODSClhi
lEODEGli?
Ili6ngUiac
Hinh 1: Phdn logi cdc hi thong ldm mdt bay hai
He thdng lam mat bay hoi gian tiep (IEC) cd thfi lam giam nhiet do khdng khi ma van giir nguyen do am. Dd la mdt im difim so vdi he thdng lam mat bay hoi true tiep. He thdng nay cung dugc chia lam 2 loai: He thdng lam mat bay hoi gian tifip nhifit do bau udt va he thdng lam mat bay hoi gian tifip diem suong [3].
He thdng lam mat bay hoi gian tifip nhifit do bau udt cd thfi lam giam nhifit do khdng khi xuong thap, nhung khdng thfi thap hon nhiet do bau udt ciia khdng khi vao. He thdng nay bao gdm 3 loai IEC dang tam, IEC dang hinh dng va IEC dang ong nhifit.
He thdng lam mat bay hoi gian tifip difim suong cd the lam giam nhifit do khdng khi ra khdi thifit bi xudng thap hon nhifit do ban udt va tiem can nhifit do difim suong cua
khdng khi vao thifit bi. '^
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NGHIEN C L T U - T R A O D O I He thdng lam lanh bay hoi ket hgp (Combined DEC/IEC) cd do am thap hon, hieu suat cao hon va do am dugc kifim soat hon so vdi ca hai he thdng kieu true tiep va gian tifip, tuy nhifin he thdng nay c§n chi phi ban dau cao va he thdng phiic tap. He thdng nay phd bifin d cac d£Lng hai giai doan, ba giai doan va nhifiu giai doan, cu thfi bao gdm:
Lam lanh bay hoi kfit hgp hai giai doan bao gdm thifit bi lam lanh bay hoi gian tifip (giai doan 1), theo sau lam thifit bi lam lanh bay hoi true tiep (giai doan 2). Loai nay hifiu qua dat dugc khoang 90-120%, nhung miic tifiu thu nudc tang 55% [6].
Liim lanh bay hoi ket hgp ba giai doan la loai hai giai doan ket hgp vdi giai doan tach am bang chat hiit am, cd thfi tifit kifim nang lugng 54% -82% so vdi cac he thdng lam lanh Sli dung may nen truyen thdng [7].
Lam lanh bay hoi kfit hgp nhieu giai doan la mgt he thdng lam lanh bay hoi hai giai doan kfit hgp vdi cac chu ky lam lanh khac, vdi miic tifit kifim nang lugng tit 75-79% cao hon so vdi he thdng lam lanh sit dung may nen truyen thdng [8].
Mehere va cac cdng su [9] da phan tich va tdi uu hda qua trinh truyen nhifit va truyfin chat trong he thdng lam lanh bay hoi true tifip.
Phan tich da chi ra rang, luu lugng khdng khi va sd t3m cooling pad la hai yfiu td anh hudng chinh dfin hifiu suat lam mat cua mgt he thdng lam mat bay hoi true tifip. Vdi sd lugng tam cooling pad tdi uu, nhiet do khdng khi dau ra dat dugc 25,5°C, do am tuong ddi dat 75% va hifiu suat dat dugc 82,6% vdi difiu kien mdi trudng xung quanh 35''C. Tdc do Iudng khdng khi tdi uu la 0.0135 kg/s. Tuy nhifin, anh hudng cua hai thdng sd quan trgng la nhiet do va luu lugng nudc vao he thdng lam mat khdng dugc dfi cap trong nghien ciiu nay.
O Viet Nam hifin nay, cd kha it cdng trinh nghien ciiu ve cdng nghfi lam mdt bay hoi, mac du cdng nghfi nay da dugc iing dung kha phd bifin trong mgt sd nganh cdng nghifip va dan dung, ciing nhu trong cac thifit bi gia dung [10, 11]. Bai bao dugc tac gia vifit nham gop phan vao viec nghifin ciiu cac yfiu td anh hudng den qua trinh lam lanh bay hoi true tifip de dfi ra cac che do lam vific hgp ly cua thifit bi lam mat bay hoi trong dieu kien khi hau Viet Nam.
2. M 6 H I N H THf NGHIEM
2.1. Thiet bi thi nghiem
Tdng quat md hinh dugc lap dat tai Trudng Dai hgc Su pham Ky thuat TP.Hd Chi Minh [12] dimg dfi do dac thuc nghiem dugc cho trong Hinh 2. Md hinh nay la kieu lam mat bay hoi true tifip dugc thifit kfi bao gom mgt so bd phan: Quat hiit, bom nudc, bifin tan diing difiu chinh tdc do qugt va bom, thiing chua nudc, tam trao ddi nhifit cooling pad. Thfing sd kich thudc cac thifit bi gdm: Bom, cdng suat 400W, sir dung difin 3 pha 220V; Quat, cong suat 400W, cung su dung difin 3 pha 220V, toe do quay 1425v/ph; TSm trao ddi nhifit cool- mg pad: Cao 80cm, dai 62cm va rdng 15,6cm;
Thiing chiia nudc tuan hoan vdi thfi tich chiia 150 lit; Bifin tSn hifiu DELTA VFD-L cdng suat 1 HP, loai 1 pha dugc sii dung de thay ddi lim lugng cua bom va quat.
Hinh 2: Sa do nguyen ly cua hi thong ihi nghiim ldm lgnh bay hai nuac:
1) Vi tri do nhiet dp vd dg dm khong khi ddu ra;
2) Vi tri do nhiel dp vd dg dm khong khi dau vdo;
3) Vi tri do nhiel do cua mrdc
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NGHIEN CLTU - TRAO OCl Nhifit do va do am cua khdng khi vao va ra khdi thiet bi dugc xac dinh bang dung cu do cd thdng sd trong Bang 1 dudi day:
J-1. Thong so thiet bi do:
STT 1
Ten thiet bi Apech TH-05/ Jumbo Digit
Dai lioat dSng Indoor: 0-50»C Outdoor:-50"-70»C Dpim: 15 + 95%
Do cliinti xac Nhiet do: ± 1°C Dp im: ± 5%
Difiu kifin mdi trudng trong qua trinh do dat thuc nghifim: Nhifit do tnmg binh: t = 30°C; Do am tmng binh: cp ^ 75 %.
Luu lugng nudc va luu lugng khdng khi dugc thay doi bang bien tan dfi difiu khifin tSn sd ciia ddng co bom va quat. Da cay dugc sir dgng dfi lam lanh nudc va nhiet do nudc trong thimg chiia dugc difiu chinh dfin nhiet do yeu cau ciia thi nghifim bang each difiu chinh lugng nudc va lugng da trong thimg.
Nhiing thi nghifim chu yeu da dugc thuc hien tren mo binh nham xac dinh cac ndi dung.
- Xac dinh anh hudng cua nhifit do nudc dfin hieu qua lam vific cua he thdng lam mat bay hoi nudc.
- Xac dinh anh hudng cua luu lugng nudc dfin hifiu qua lam viec ciia he thdng.
- Xac dinh anh hudng cua luu lugng khdng khi dfin hifiu qua lim viec cua he thdng.
Ket qua ciia cac thi nghifim nay dugc trinh bay ben dudi.
2.2. Anh huong cua nhiet (to nirofc den hieu qua Um vific cua he thdng
Nhu bieu dien trfin Hmh 3, cd 7 trudng hgp cd thfi xay ra trong qua trinh truyfin nhifit
va chat giiia nudc va khdng khi, tuy thudc vao nhifit do Clia nudc so vdi nhifit do ciia khdng khi. Trfin thuc tfi, qua trinh A-1 vaA-2 khdng cd y nghTa trong he thdng lam mat (hic nhifit do khdng khi tang lfin hay khdng ddi sau khi tham gia qua trinh). Vi vay, thi nghiem dugc thuc hien vdi 5 trudng hgp cdn lai, bao gdm:
(i) Nhiet do nudc t^ nam giiia nhifit do nhiet kfi khd tjj^ va nhiet do nhifit kfi udt twb cua khdng khi; (ii) Nhifit do nudc bang nhifit do bau udt t = t^j^; (iii) Nhiet do nudc nam giira nhifit do bau udt va nhifit do difim suong t^ "^ t^ *^ t^^;
(iv) nhifit do nudc bang nhiet do diem suong t^ ^ tj va (v) Nhiet do nudc thap hon nhifit do difim suong t^ < t^. Kfit qua cua 5 thi nghiem nay dugc cho trong Bang 2.
Hinh 3 Trgng thdi thay doi ciia qud trinh truyin nhiet vd chdt giira nuac vd khong khi
ISSN 0866 - 7056
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NGHIEN CLfU-TRAO DOI
STT i ii lii iv
V
Bdng 2. Ket qud thi nghi&m vai nhiet do
Thi nghi&m twb<twl<tdb
tw2 = twb tdp < tw3 < twb
tw4 = tdp tw5 < tdp
V,.
27.9''C 29.0"C 32.0»C 32.5"C 28.0"C
U,.
24.8»C 26.A'C 26.9°C
n.ifc
24.8°C
"Pl.
79%
82%
68%
66%
78%
nwac khdc nhau:
' d p - l n
23.5"C 25.6"C 25.3°C 25.3"C 23.8"C
*s.-,d
25.8"C 26.4''C 26.0»C 25.3»C 22.0°C
dlMIIil
26.0"C 26.8°C 27.8"C 27.5°C 25.0"C
f...
82%
82%
69%
67%
76%
Neu dinh nghia hifiu suSt tao am i\ theo bieu thlic dudi day:
tdb- tvtb-in (1)
- Nhifit do nhiet kfi khd Trong dd: t^
dau vao ("C);
tjj^^^j - Nhifit dd nhifit kfi kho dSu ra ("C);
X^^^ - Nhifit dfi nhifit kfi udt dau vao ("C).
Ta cd mdi quan he giiia luu lugng nudc lam mat Qw va hifiu suat tao am i\ img vdi nhifit do nudc lam mat khac nhau dugc bifiu difin trfin Hmh 4. Tuong tu, mdi quan he giiia luu lugng nudc lam mat Q^ va nhiet do khdng khi ra khdi thiet bi lam mat t^^^^^^ iing vdi nhifit do nudc lam mat khac nhau dugc bieu dien trfin Hinh 5.
Tir kfit qua Bang 2 va Hinh 4, 5, ta thiy:
Nhifit do khong khi ra khdi thifit bi lam mat ludn cao hon nhiet do nhifit kfi udt cua khdng khi ngd vao. Difiu nay ddng nghia vdi vific he thdng lam mat kieu bay hoi nudc se lam vific hieu qua ddi vdi nhiing vimg khi hau cd nhifit do nhifit kfi udt thap, tiic cd do Sm khdng khi thap hay do khd cao.
-
^ - -
^
- - - -- "1
Htnh 4. Mdi quan he giira ij vd 2„, w«g vol' nhi§t dg nudc khdc nhau
Hinh 5. Moi quan he giira l^^^^^^ vd Q^ ung vdi nhiet do nuac khdc nhau
Khi nhifit do nudc cao hon nhifit do diem suong t^ > t , nhifit do khdng khi ra khoi thiet bi giam nhiet do nhung it. Ngugc lai khi t^ < tj , nhifit do khdng khi ra khdi thifit bi giam nhifiu. Dieu nay din dfin khuyfin nghi la nen co ngudn nudc cd nhiet do cang thap cang tdt dS giai nhifit cho thiet bi nham tang hieu qua lam ISSN 0866 - 7056
T^P CHf CO KHf VIET NAM, So 6 nam 2017
NGHIEN CU'U-TRAOOOl
viec cua thifit bi lam mat bay hoi.
Cac trudng hgp khi nhifit do ciia nudc cao hon nhiet dg diem suong cua khdng khi, do am khi khi ra khdi thifit bi se tang. De giam do am Clia khdng khi ra khdi thiet bi, nhiet do nudc lam mat phai th3p hon nhiet do difim suong cua khong khi ngd vao.
Cac trudng hgp nhiet do nudc cao hon nhifit do diem suong ciia khdng khi t^ > t^, khi luu lugng nudc tang thi nhiet do khdng khi ra khdi thifit bi t^^^^^ tang va hifiu suit tao i m ri giam. Ly do la khi luu lugng nudc tang thi qua hmh bay hoi nudc dien ra lau hon lam tang thdi gian trao ddi nhifit giiia nudc va khdng khi, dan den viec lay di nhiet hifin trong khfing khi chSm hon.
Cdc trudng hgp nhifit do nudc thSp hon hay bang nhifit do diem suong ciia khdng khi t ^ t j , khi luu lugng nudc tang thi nhiet do khdng khi ra khdi thifit bi t_,^^^j giam va hifiu suat tao am ri tang. Vific nay dugc giai thich do nhifit do nudc thip hon difim suong se giiip ngung tu mdt phan hoi nudc cd trong khdng khi, tlic giiip giam nhifit an cua khdng khi, nfin khi luu lugng nudc tang se cang lam giam nhifit an ciia khong khi.
2.3. Anh huong cua luu lugng niro'c den hieu qua lam vi^c cua he thong
Tien hanh thi nghifim vdi che do luu lugng nudc va khdng khi khac nhau vdi nhifit do nudc khdng ddi (trudng hgp t^^^ < t^j < t^^), ta cd mdi quan hfi giiia luu lugng nudc lam mat Q^ va hifiu suat tao am ri trfin Hinh 6 va mdi quan he giiia luu lugng nudc lam mat Q^
va nhifit do khdng khi ra khdi thifit bi lam mat hu „.,. trfin Hinh 7.
Hinh 6. Anh huang ciia luu lugng nuac den hieu qud ldm viic ciia he thong
.,
Hinh 7. Moi quan he giira t^^^^ vd Q^ ung vai liru lugng khong khi khdc nhau
Qua Hinh 6 va 7 ta thay, iing vdi cac che do luu lugng khdng khi khac nhau, vific tang luu lugng nudc dfiu dSn dfin nhifit do khdng khi ra khdi thiet bi t^^^^^ tang va hifiu suat tao am T] giam. Ly do da dugc giai thich d phan trfin. Qua dd ta cd thfi kfit luan:
Khi nhifit do nudc lam mat ldn hon nhifit do difim suong cua khdng khi t^ > t^, nfin duy tri lugng nudc lam mat nhd di vao thifit bi dfi tang hifiu qua lam mat.
Khi nhiet do nudc lam mat nhd hon hay bang nhifit do difim suong cua khdng khi t ^ ^ t j , nfin duy tri lugng nudc lam mat ldn dfi phat huy hieu qua lam mat ciia thifit bi bay hoi lam mat.
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NGHIEN CU'U-TRAO D(!)l 2.4. Anh huong cua luu lirgng khdng khi den hieu qua lam viec ciia he thong
Tuong tu, ling vdi nhifit do nudc khdng ddi (trudng hgp t^^ < t^j < t^^^), ta cd mdi quan he giua luu lugng khdng khi Q^ va hifiu suat tao am r| tren Hinh 8 va mdi quan he giira luu lugng luu lugng khdng khi Q^ va nhifit do khdng khi ra khdi thifit bi lam mdt t^^^^^^ trfin Hmh 9. Qua Hinh 8 va 9 ta thiy, iing vdi cac chfi do luu lugng nudc khac nhau, viec tang luu lugng khdng khi dfiu din den nhiet do khdng khi ra khdi thifit bi t^^^^ giam va hifiu suat tao am T] tang. Viec nay cd the dugc giai thich khi tang luu lugng khdng khi, qua trinh bay hoi nudc tang din den giam nhifit an cua khdng khi, tir dd giiip nhifit do khdng khi ra khdi thifit bi se giam va hieu qua lam mat tang.
Hinh 8: Moi quan hi giira tj vd Q^ ung vdi liru lugng nuac khdc nhau
2.5. Anh h u ^ g cua ti sh giira liru luong nud'c va luu lugng khdng khi E den hi^u qua lam vific cua hfi thong
Nfiu dinh nghia E la ti sd giua luu lugng nudc va luu lugng khdng khi vao thifit bi lam mat thi anh hudng cua nd den hifiu qua lam vific cua thifit bi dugc thfi hien tren Hinh 10, ling vdi trudng hgp nhiet do nudc nSm giiia nhifit do nhifit ke khd va nhifit do nhifit ke udt cua khdng khi t^^^ < t^ < t^^ va Hinh 11, iing vdi trudng hgp nhifit dg nudc thap hon nhiet do diem suong cua khdng khi t^ < t , .
27 26.8 S26.6 Z 26.A 1 26i 1 261 1 26
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-t-T70 -•-6SS - ^ « 7
Hinh 10: Moi quan hi giiia t^^^, vd E dng vdi trudng hgp t^^<t^<tj^
Hinh 9: Moi quan hi giira l^^^^^ vd Q^ ung vdi luu lugng nudc khdc nhau
Hinh 11: Moi quan hi giira tj^^^^ vd E img vol truang hgp t^_ < t^
Qua Hinh 10 va 11 ta thay:
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NGHIEN CU'U-TRAO D 6 |
Khi nhifit do nudc lam mat ldn hon nhifit dd difim suong cua khdng khi t^ > t^, khi E tang hic tang lugng nudc vao thifit bi lam mat, nhifit dd khdng khi ra khdi thifit bi tang ling vdi mgi chfi do luu lugng khdng khi vao thifit bi.
Khi nhifit do nudc lam mat nhd hon nhifit do diem suong cua khdng khi t^ < t^, khi E tang tlic tang lugng nudc vao thifit bi lam mat, nhifit do khfing khi ra khdi thiet bi giam img vdi mgi chfi do luu lugng khdng khi vao thifit bi.
Nguyen nhan cung dugc giai thich tuong tu nhu trong phan 2.2.
3. KET LUAN
Bai bao da nghifin ciiu thge nghifim mdi quan he giua luu lugng khdng khi Q,, luu lugng nudc Q^, hieu suat tao am i], ti sd luu lugng nudc va khdng khi E den hifiu suat lam viec cua thifit bi lam mat bay hoi. Bai bao cung da nghifin ciiu anh hudng cua cac thdng sd ndi tren den boat ddng cua thifit bi lam lanh bay hoi d cac nhigt do nudc vao khac nhau va xac dinh dugc:
Ci cac chfi do nhiet do nudc lam mat ldn hon nhiet do diem suong ciia khdng khi t^
> t , nfin duy tri lugng nudc lam mat nhd di vao thifit bi de tang hieu qua lam mat.
0 cac chfi do nhifit do nudc lam mat nhd hon hay bang nhiet do difim suong cua khdng khi t ^ t ^ , nen duy tri lugng nudc lam mat ldn dfi phat huy hieu qua lam mat ciia thifit bi bay hoi lam mat.
Luu lugng khdng khi tang se lam tang hifiu qua lam vific cua thifit bi bay hoi lam mat.
U"ng vdi difiu kien khi hau ndng am cua Viet Nam, nudc dua vao thifit bi lam mdt bay
hoi nfin cd nhifit do thap hon nhifit dd difim suong Clia khdng khi de lam giam nhifit dd va do am cua khdng khi ra khdi thifit bi. Ngudn nudc nay, cd the lay tir nhiing ngudn nudc ngam hay nudc thai tir cac he thdng, thifit bi hay qua trinh Iam lanh.<*
Ngay nhan bai: 28/5/2017 Ngay phan bifin: 15/6/2017 Tai lifiu tham khao:
in vd qudn ly nang Iteang
•a nha, NXB. Khoa hoc v i [1] Nguyen The Bao (2015); fid.
trong cong nghiep vd trong ci Ky Ihull.
[2], AinerO.BoukhanoufR-andIbrahimH,O.(2015)-Areview of evaporative cooling technologies Intemational Joumal of Environmental Science and Development 6 (2), pp 111 - 117
[3], Duan 2 et a l , (2012) - hidiiect evaporative cooling; past, present and future potentials Renewable and Sustainable Energy Reviews 16, pp 6823-6850.
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lao mo hinh dieu hoa khang khi bdng phirang phdp ldm mdt bay ho'i', De tSi nghien ciru khoa hgc cap trudng, Truong Dsn hoc Su phsm Ky thuiii TP H6 Chi Minh
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