bai4_quẠt và hỆ thỐng_r
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QUT v H THNG(FANS, BLOWERS AND SYSTEMS)
DN NHPCC LOI QUTCC THNG S:
C TNH, HNH HCCHN QUTCC QUI LUT NG DNGVN HNH, LP T
KHO NGHIM QUT TNH TR LC H THNG ( xem gio trnh) TNH TAN CC KCH THC CHNH CA QUT
Nguyn Hng Tm
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QUT v H THNG Qut c s dng nhiu
trong sinh hat, cng nghip,nhm cung cp go, tiu th> 15% ingm:
Qut, ng ng+co ni,mt+iu khin, thit b o,thit b u cui (B TN,
HKK..)
Fans: H< 1136mmWG
(t s nn 1.2 )
Nguyn Hng Tm
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QUT v H THNG
CC LOI QUT4 LOI CHNH: li tm ( centrifugal), hng trc (axial),hn hp (mixed flow) v ngang dng(cross flow)
Nguyn Hng Tm
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QUT v H THNG
QUT LITM: cu to v NLH
Ht vo
Thi ra
Nguyn Hng Tm
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Nguyn Hng Tm 5
QUT LITM: cu to v NLH
Plenum Fan Qut c 2ming ht
FC Fan( Sirocco
)
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Nguyn Hng Tm 6
Cu to rotor: Da sau, cnh, da trc
Da trc c th cn, phng hockhng c ty theo cng dng
Da sau phng hoc khng c
Cnh c hoc khng c gn tngcng ( bn)
Da sau
Cnh
Da Cn trc
Gn tng bn
Gn tng bn
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Nguyn Hng Tm 7
QUT v H THNG
CC DNG CNH:
Dng kh(AF)
Nghing lui (BI),Cong ti (FC)
Hng tm (RB)
u cnh hng tm (RT)
2 ming ht
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Nguyn Hng Tm 8
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Nguyn Hng Tm 9
Qut li tm nhiu tng cnh
V ngoi dng tr trn
Qut li tm 1 tng cnh c
v ngoi dng xon c
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QUT v H THNG
CC DNG CNH:phm vi s dngCnh AF: c hiu sut () cao nht, t n, dng trong
thng thang,HKK, TN.
Cnh BI: d ch to hn AF, dng trong HVAC, kh ctnh mi mn
Cnh FC: t n nht, Q ln, thp
Cnh RB: trung bnh, vn chuyn vt liuCnh RT: c cao hn RB
Nguyn Hng Tm
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QUT v H THNG
QUT HNG TRC: cu to v NLH
C 3 dng Qut chong chng,(propeller, panel)
Qut trc ng (tube axial, TAF)
Qut trc c hng dng (van axial, VAF)
Nguyn Hng Tm
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QUT v H THNG
QUT HNG TRC: 2 tng cnh,
nhm tng H, c 2 dng:
2 stage VAF 2 stage TAF
Nguyn Hng Tm
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13Nguyn Hng Tm
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ng c tnh ca qut HT
ng c tnh cacc lai qut HT ccng ng knh rotov s vng quay n
Nguyn Hng Tm
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QUT v H THNG
QUT mixed flow = axial +centrifugalDng 1
Dng 2
Nguyn Hng Tm
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QUT mixedflow = axial +centrifugal= inline centrifugal
Nguyn Hng Tm
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QUT v H THNG
QUT crossflow
Nguyn Hng Tm
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CC THNG S KCH THC QUT HT
ng knh rotor, Dro, ng knh trng, Dtr, Dh ng knh v, Dv Gc t cnh 1 2
Khe h u cnh < 1,5% chiu di cnh Cnh nn dng Chiu di ng vo
L1> 0,2Dtr
Chiu di v L2 > 0,7Dtr Bn knh loe r S cnh z, dng cnh kh
ng, hay cong phng
Nguyn Hng Tm
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nh hng ca cc thng s hnh hc
T s Dh/Dr n H
S cnh v B rng cnh n n v
Khe h u cnh n , n, H
Nguyn Hng Tm
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nh hng ca gc t cnh
Gc t cnh nh hng n Q, H
Nguyn Hng Tm
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CC THNG S KCH THC QUT LT ng knh roto D2, ng knh ming ht D1, b rng
roto B1, B2; b rng v B; gc t cnh 1, 2; C vngai trn, hoc xon vi cc bn knh to v R1, 2, 3, 4hoc khng c v
S cnh z, dng cnh kh ng, cong phng
Nguyn Hng Tm
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CC QUI LUT NG DNG
ng dng lu lng
ng dng ct p
ng dng cng sut
ng dng nN2 - N1=50 log10(D2/D1) + 50 log10(n2/n1)
Vi ch s 1 l ca qut bit, 2 l ca qut mun bit
3
1
2
1
2
1
2
=
D
D
n
n
Q
Q
2
1
2
2
1
2
1
2
=
D
D
n
n
p
p
5
1
2
3
1
2
1
2
=
D
D
n
n
P
P
Nguyn Hng Tm
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NG C TNH QUTH THNG
th m t quanh ca Q vi H,P,
im BEP im FOP
l giao im cang c tnh qutvi h thng
Nguyn Hng Tm
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Nguyn Hng Tm 25
NG C TNH QUT
th m t quan h ca Q vi H,P,
10
12
14
16
18
20
22
24
26
20
30
40
50
60
70
80
90
100
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Tnhap,mmH2O,
Hieusuat,oon
Lu lng, m3/s
NG AC TNH QUATQuat 150HT-0.50-32-2010, n=782 v/ph
mmH2O
Tinh,%
Co, %
dB(A)_T
kWatt
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KHO NGHIM QUT
Nhm xc nh ng c tnh qut PHNG PHP vt cn : (Orific, Ventury, Nozzle)
PHNG PHP dng ng pitot (H ng kho nghim):(JIS B 8330, ANSI/AMCA 210-99)
Nguyn Hng Tm
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Nguyn Hng Tm 27
Dng c o p: ng pitot, p k
Phng php l ( orific)
p k nghing ( inclined manometer)
ng pitot
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Nguyn Hng Tm 28
c thm
Gio trnh Bm qut my nn, Nguyn Hng tm, 2007; v
Phng php kho nghim qut theo JIS B 8330
Phng php ng kho nghim
Khi
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ng pitot tiu chun
Nguyn Hng Tm
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V tr o vn tc gi trong ng trn, ch nht
Nguyn Hng Tm
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TR LC H THNG
TR LC NG NG TR LC CC B
TR LC CA THIT B U CUI.
c ti liu: NGUYN HNG TM , 2007, Gio trnh Bm Qut My nn ng
dng
ASHRAE handbook, 2004. Systems and Equipment. Chng16,18 .ASHRAE handbook, 2001. Fundamental. Chng,12,32,34,35.
Le Ch Hiep. 2001. Ky thuat ieu hoa khong kh: Chng 10:Thiet ke ong dan khong kh, trang 325- 416. Nxb Khoa hoc Kythuat, Ha noi.
Nguyn Hng Tm
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TNH TAN
Nhm tnh ton cc thng s chnh caqut: hng trc, li tm c NGUYN HNGTM , 2007, file Xls, Gio trnh Bm Qut My nn ngdng
v cc bng tnh Excels. Lm cc bi tp lin quan, v Lm cc kho nghim qut Lu : vic tnh tan thit k qut cn kt hp
l thuyt v thc nghim, kinh nghim, nhtl i vi qut li tm v c nhiu s chn la chomt yu cu c th
Nguyn Hng Tm
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MT VI LU KHI LP T QUT-TK
c th: treo 1 bn, 2 bn, hoc t 1 bn,
Khng hoc c ming ht chuyn hng, 1 hay 2 ming ht..
Nguyn Hng Tm
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36Nguyn Hng Tm
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Lp t qutng ng htLp ng ng ht
Lp sai
Nguyn Hng Tm
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Lp t qutng ng y
Lp ng ng y ng
Lp sai
Cn chn qut hp l din tch ming thi v din tch ng ng gn bng nhau!
Nguyn Hng Tm
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Nguyn Hng Tm 39
Lp trn sng
Lp di trn nh
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Nguyn Hng Tm 40
Kim tra
b truyn ai
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LP QUT HT
CHA NG NG
Mt pha trc cnh gy ri v n
cn u vo ln gy ri v tn tht
Nguyn Hng Tm
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42Nguyn Hng Tm
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Nguyn Hng Tm 43
Qut HT lp trn sng nh
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Nguyn Hng Tm 44
Qut HT lp di trn
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Nguyn Hng Tm 45
Qut + Moto lp ngoi, lp trn sng
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Nguyn Hng Tm 46
Qut + Moto lp ngoi,lp di trn
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Nguyn Hng Tm 47
Cn trao i thm xin lin h:
GVC. Nguyn Hng Tm
hungtamng@yahoo.com
D 0913 900 676
Mt s hnh nh v qut c nghin cu TK ch toKN v lp t
mailto:hungtamng@yahoo.commailto:hungtamng@yahoo.com -
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Nguyn Hng Tm 51
NOW
WHAT ???Why ???
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