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15
TCVN T I U C H U N Q U C G I A
TCVN ...-3:2017
(ISO 10294-3:1999)
Xut bn ln 1
TH NGHIM KH NNG CHU LA
VAN CHN LA CHO H THNG PHN PHI KH
PHN 3: HNG DN TH NGHIM
Fire resistance test Fire dampers for air distribution system
- Part 3: Guidance on the test method
H NI - 2017
D THO
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TCVN -3:2017
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Mc lc
Trang
1 Phm vi p dng ............................................................................................................................... 5
2 Ti liu vin dn ................................................................................................................................ 5
3 Nguyn tc chung ............................................................................................................................. 5
4 Nguyn l th .................................................................................................................................... 7
5 Thit b th ........................................................................................................................................ 7
6 Cu trc th nghim ........................................................................................................................ 12
7 Xc nh r r ca ng ni v trm o .......................................................................................... 14
8 Xc nh r r nhit mi trng ............................................................................................ 15
9 Th chy .......................................................................................................................................... 15
10 Bo co th nghim ....................................................................................................................... 15
11 Dn gii v tiu ch v phn loi trong TCVN-2 (ISO 10294-2) .................................................... 16
Ti liu tham kho ................................................................................................................................ 17
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TCVN -3:2017
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Li ni u
TCVN -3:2017 hon ton tng ng vi ISO 10294-3:1999.
TCVN -3:2017 do Vin Vt liu xy dng - B Xy dng bin son,
B Xy dng ngh, Tng cc Tiu chun o lng Cht lng
thm nh, B Khoa hc v Cng ngh cng b.
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T I U C H U N Q U C G I A TCVN ...-3:2017
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Th nghim kh nng chu la Van chn la cho h thng phn
phi kh Phn 3: Hng dn th nghim
Fire resistance tests Fire dampers for air distribution system Part3: Guidance on the test
method
1 Phm vi p dng
Tiu chun ny a ra hng dn vic p dng cc phng php th nghim quy nh trong tiu
chun TCVN -1 (ISO 10294-1).
Phng php th nghim ny c lin quan ti vic nh gi van chn la c kh nng ngn chn s
ly lan ngn la v kh nng t cn h ny sang cn h khc. Tiu chun ny khng dng cho van
chn la ch s dng trong cc h thng kim sot khi.
C th p dng cho van chn la trong h thng phn phi kh.
Phng php th ny khng c thit k th nghim cho cc thit b chng chy m ch cho cc
bin php vn chuyn khng kh, hoc khi van chn la c treo trn trn nh th vic lp t van
chn la v ng dn c th nh hng tiu cc n tnh nng ca trn th, nn cn yu cu cc
phng php nh gi khc.
CH THCH: "Vn chuyn khng kh" l mt bin php p sut thp i qua ca ngn chy (hay tng, sn) m khng c
bt k kt ni vi mt ng dn kh no.
2 Ti liu vin dn
Cc ti liu vin dn sau l cn thit khi p dng tiu chun ny. i vi cc ti liu vin dn c ghi
nm cng b p dng th p dng bn c nu. i vi cc ti liu vin dn khng ghi nm cng b
th p dng phin bn mi nht, bao gm c bn sa i, b sung (nu c).
TCVN 8113-1 (ISO 5167-1), o dng lu cht bng thit b chnh p gn vo ng dn c mt ct
ngang trn chy u Phn 1: Nguyn l v yu cu chung.
TCVN 9311-1 (ISO 834-1), Th nghim chu la Cc b phn cng trnh xy dng Phn 1: Yu cu
chung.
TCVN -1 (ISO 10294-1), Th nghim kh nng chu la Van chn la cho h thng phn phi kh
Phn 1: Phng php th.
TCVN -2 (ISO 10294-2), Th nghim kh nng chu la Van chn la cho h thng phn phi kh
Phn 2: Phn loi, tiu ch v p dng kt qu th nghim.
3 Nguyn tc chung
3.1 Qui nh chung
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Php th m t trong tiu chun TCVN-1(ISO 10294-1) c thit k nhm nh gi van chn la
c cc kh nng sau:
a) ng li trong trng hp xy ra chy trong iu kin ng;
b) ngn chn s ly lan ngn la v kh nng t cn h ny sang cn h khc thng qua h thng
phn phi kh.
Cc yu cu i vi h thng phn phi khng kh thng xem xt n s ly lan ngn la, v th hin
r trong nguyn tc thit k (xem thm iu 4 ca tiu chun TCVN-1(ISO 10294-1)). S khc bit
v nguyn tc v thc t c a ra trong 3.2-3.5.
3.2 Bt/tt qut
Vi quan im thit k khc nhau. mt s ng dng, h thng phn phi kh c thit k trong
trng hp xy ra chy qut s tt. Cc qut khc vn c yu cu tip tc cung cp x l khng kh
n cc b phn trong ta nh ti cc im cch xa vng ha hon. Trong tnh hnh , cc van chn
la phi ng li iu kin ng, v mt khi qut ng, van c th phi chu mt p lc m cao lm
cho nguy c r r kh tng ng s cao hn v do la c kh nng ly lan nhanh hn.
H thng li th qut c th khng tt, cho nn khng th m bo trong iu kin ha hon qut s tt
v do iu kin ng c th tn ti. V vy vic th nghim van chn la di iu kin ng c
xem l mt th nghim quan trng. La chn p lc m tiu chun 300 Pa v n tng ng vi p lc
m c s dng trong tiu chun ISO 6944:1985. iu ny c xem l ph hp trong hu ht cc
ng dng. ng dng van chn la cho cc ngnh cng nghip c bit c th c thit k chu p
lc m ln hn. cho php cc ng dng c bit ny, cn thc hin cc php th p lc m tng
ln.
Vn tc th chy 0,15 m/s l mt tha thun cn thit cho mt php th nghim lu lng khng kh
ng v an ton chy trong cc phng th nghim th chy. V nhng l do an ton, nu xem xt thy
cn dng th nghim vn tc/p lc cao hn phi thc hin trong iu kin lu lng dng khng
kh xung quanh v khng thc hin khi bung t nhit cao.
Tha nhn rng iu kin ng ti cc van chn la c th do cc ngun c hc hoc kt hp ca
nhit v hiu ng ng khi, do tt c cc van chn la s c th nghim theo cc yu cu
ca tiu chun TCVN -1(ISO 10294-1).
3.3 Thc hnh lp t
Thc hnh thit k c th yu cu cc van chn la c lp t trong mt phng tng, sn v
khng cho php van chn la t cch xa cu trc ngn cch. Thc hnh thit k cng c th cho
php cc van chn la c lp t trn b mt hoc t cch xa tng hoc sn. Phng php th
nghim a ra cc ch dn cho th nghim tt c cc hnh thc lp t c th c nhng khi tin hnh
th nghim ch cn p dng vi hnh thc lp t c lin quan.
3.4 Cch nhit
Van chn la c c hai loi cch nhit v khng cch nhit. Phng php ny a ra phng php
th nghim cho tt c cc loi van chn la.
3.5 Tnh ton vn
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Tnh ton vn trn c s o khe r r kh thng qua cc van chn la, cng vi phng php o tnh
ton vn thng thng quanh chu vi pha ngoi mu. Phng php o r r ng a ra trong tiu
chun TCVN -1(ISO 10294-1) mt ch dn chnh xc hn v tnh ton vn.
4 Nguyn l th
Nguyn tc chung ca th nghim c m t trong 3.1
Trc khi xc nh r r, th van chn la phi chu 50 chu k ng v m. iu ny nhm i din
cho khong hai k kim tra lp t v vn hnh chnh xc vi tng van chn la mi nm. S chu k
c th khng y cho van chn la c chc nng iu khin lu lng dng kh.
Cc th nghim chy c bt u vi cc van chn la v tr m. iu ny nhm kim tra cc c
cu kch hot chnh gn lin vi cc van chn la. Th nghim ny khng s dng cho cc thit b
iu khin th cp t xa van chn la. iu quan trng khi bt u th nghim, khng ch kim tra
cc c cu kch hot, m cn kim tra tnh trng van chn la trong thi gian vn m khng b bp
mo v ngn chn vic ng van khi c cu kch hot hot ng.
C mt s kh khn c th xy ra trong vic kim sot nhit v p lc bung t khi van chn la
m, l cn cung cp thi gian van chn la ng trong thi gian quy nh 2 pht, phi nm
trong gii hn quy nh ca ng biu din nhit - thi gian a ra trong tiu chun TCVN 9311-1
(ISO 834-1), mc 5 pht.
Xem iu 4 ca tiu chun TCVN-1(10294-1).
5 Thit b th
5.1 Qui nh chung
Nhn chung cc thng tin v iu kin bung t v cc php o nhit c a ra trong tiu chun
TCVN 9311-1 (ISO 834-1) y v khng cn chi tit hn. Tuy nhin, cn b sung mt s m t
chi tit cho php o lu lng theo tiu chun TCVN 8113-1 (ISO 5167-1), v ISO 5221 v iu ny
c trnh by chi tit trong 5.3. Xem thm iu 5 ca TCVN-1(ISO 10294-1).
5.2 ng ni
Mi lin h gia chiu di ng ni vi kch thc ng cho van chn la c xem l kh quan
trng do s khc bit v tnh nng c th xy ra trong mt s trng hp.
Trong thc t hu ht cc kch c van chn la c kim tra vi chiu di ca ng ni s bng kch
thc ng cho ca van chn la. Tuy nhin, gii hn di ti a l 2 m c a ra bi nhng
hn ch v mt kch thc trong phng th nghim.
Xem 3.4 v 5.1 ca tiu chun TCVN-1(ISO 10294-1).
5.3 Trm o
5.3.1 Qui nh chung
Xem 5.1 ca tiu chun TCVN-1 (10294-1).
5.3.2 Lu lng th tch
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o lu lng th tch theo tiu chun TCVN 8113-1 (ISO 5167-1) v ISO 5221, cn khi lng
ring ca lu cht.
5.3.2.1 Khi l
Khi l t bung t c cha N2 v CO2 cng nh H2O vi nng cha bit.
Tuy nhin, cho mc ch tnh ton kh c th c coi nh khng kh kh v khi lng ring c th
c tnh theo nh lut ca kh l tng:
Trong :
R l hng s kh ca khng kh, n v J/(kg.K);
V l th tch ring, n v m3/kg;
l khi lng ring ca khng kh kh ti p sut tuyt i p v nhit tuyt i T.
T cng thc sau:
Trong l khi lng th tch ca khng kh kh ti p sut tuyt i p0 v nhit tuyt i .
Cc iu kin c h s 0 c xc nh ti 00C (T0 = 273,15 K) v p0 = 1013,25 hPa (=760 torr); do
s dng = 1,293 kg/m3.
5.3.2.2 p sut tuyt i (p sut o bi kh p k)
p sut kh p phi c o bng dng c kh p k.
Trong trng hp kh p k khng c hiu lc v phng th nghim nm trn mc nc bin c mc Z
(theo h mt) khng qu 500m, th khuyn co s dng gi tr trung bnh ca p sut kh p theo cng
thc sau:
Trong Z l chiu cao (theo h mt) ca phng th nghim nm trn mc nc bin.
CH THCH: iu kin kh hu thng thng c th dn n s chnh lch khong 1% p sut o bi dng c kh p k.
Trong iu kin kh hu khc nghit, s chnh lch c th tng ln 3% (v d: gi git mnh, vn vn)
5.3.2.3 nht
Yu cu v nht thc t khi tnh ton s Reynolds (Re).
nht ng hc () ph thuc vo nhit v p sut. nht ng lc hc khng ph thuc
vo p sut m ch ph thuc vo nhit .
Mi lin h gia hai loi nht c xc nh nh sau:
(1)
(2)
(3)
(4)
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nht ng lc hc ( a ra di dng bng, th v cng thc, nh trong bng 1, hnh 1 v
cng thc (5).
Bng 1 nht ng lc hc ca khng kh kh nhit khc nhau
Nhit , t oC
Nhit tuyt i, T
K
nht ng lc hc,
10-6
kg/(m.s)
-50 223,15 14,7
0 273,15 17,2
20 293,15 18,2
40 313,15 19,1
60 333,15 20,0
80 353,15 21,0
100 373,15 21,8
120 393,15 22,7
140 413,15 23,5
160 433,15 24,3
180 453,15 25,1
200 473,15 25,8
250 523,15 27,8
300 573,15 29,5
350 623,15 31,2
400 673,15 32,8
450 723,15 34,4
500 773.15 35,8
600 873,15 38,6
700 973,15 41,2
800 1073,15 43,7
900 1173,15 45,9
1000 1273,15 48,0
CH THCH: Cho php ni suy gia cc gi tr.
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Hnh 1 nht ng lc hc ca khng kh kh theo nhit
n
h
t
ng
l
c h
c,
, 10
-6
kg
/(m
.s)
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nht ng lc hc ca khng kh kh theo nhit c tnh theo a thc sau:
Trong :
t l nhit trong khong
5.3.3 Thit b o khc
C th yu cu thit b o khc o vn tc 0,15 m/s so vi yu cu nhm o r r ca van chn
la.
Cn phi lu rng:
- Tiu ch r r S l 200 m3/(h.m2);
- Tiu ch tnh ton vn E l 360 m3/(h.m2);
- Vn tc 0,15 m/s gy ra mt dng kh 540 m3/(h.m2);
- r r ti a ca ng ni l 12 m3/h.
thun tin, c th s dng mt nhnh ng o c van ngt ph hp, mt nhnh t thit b o o
r r ca cc van chn la v mt nhnh khc t thit b o nh hn o vn tc 0,15 m/s v xc
nh r r ca thit b.
5.3.4 Phn loi van chn la theo phn loi r r (S)
Khi phn loi van chn la theo r r (S), van chn la c nh nht trong dy sn phm cng phi
c th nghim. Khi phn loi van chn la kch c nh (v d sn phm t c 100mm ti 200mm)
r r thc t c th nm ngoi phm vi lu lng th tch c quy nh trong tiu chun
TCVN 8113-1 (ISO 5167-1) v tiu chun ISO 5221. Trong iu kin th thit b o phi c hiu
chnh v phm vi c s dng. i vi lu lng dng thp v nhit gn vi nhit mi trng
xung quanh, khuyn co s dng ng h o kh lng vi phn gii ph hp. ng h o phi c
vn hnh trong mt thi gian ti thiu l 3 pht thit lp dng trn n v thi gian.
5.3.5 Van chn la c lp t trn sn
Khi th nghim van chn la lp t trn sn, khng cn c ng o ng v khng gian trong phng th
nghim c th b gii hn. V kha cnh ny m bo qui trnh thng nht gia cc phng th
nghim, th iu quan trng l phi xc nh v tr trm o khong cch bng vi ng knh ca
trm o t nh ng ni xung di nh th hin trong hnh 2 ca tiu chun TCVN-1(ISO 10294-1).
5.4 H thng qut ht
Trong van pha long s lm mt khng kh trc khi i vo qut, khuyn co s dng qut nhit
cao c kh nng hot ng ln n 300C c bit l khi th nghim van chn la khng cch nhit.
(5)
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Ch a ra mt thng s k thut ti thiu cho h thng qut ht, cho php phng th nghim linh
hot ti a trong vic thit k h thng.
C kh nng yu cu loi qut khc khi th nghim van chn la vi cc ng dng cng nghip c
bit i hi p lc m cao hn.
Xem 5.3 ca tiu chun TCVN -1(ISO 10294-1).
5.5 Nhit kh tip gip vi thit b o lu lng
y c xem l iu quan trng khi quy nh can nhit s dng trong php o ny nhm trnh s
dng can nhit c ng knh ln c th to ra s nhiu lon cc b (xem 5.4 ca tiu chun TCVN-
1(ISO 10294-1).
6 C cu th nghim
6.1 Qui nh chung
Xem iu 6 ca tiu chun TCVN-1(ISO 10294-1).
6.1.1 Mt th nghim
Khi van chn la khng i xng, cn phi th nghim c hai mt v kh c th xc nh c mt no
cho kt qu km hn. Cc van i xng ch cn th nghim mt mt. Vi mc ch xc nh liu van
chn la l i xng hay khng, th c th b qua s c mt ca c cu kch hot. Tuy nhin, trong
trng hp ny van chn la phi c lp t c cu kch hot nm mt xa l t, y c coi
l iu kin khc nghit hn v khi c cu kch hot t xa l t hn th thi gian vn hnh s lu hn.
Xem 6.1.1 ca tiu chun TCVN-1(ISO 10294-1).
6.1.2 Van chn la lp t c trn tng v sn
Trng hp van chn la lp t c trn tng v sn, th nghim s phi thc hin c hai hng tr
phi c th chng minh c hng no khc nghit hn. Xem 6.1.2 ca tiu chun TCVN -1(ISO
10294-1).
6.1.3 Cc van chn la c lp t bn trong kt cu m
Xem 6.1.3 ca tiu chun TCVN -1(ISO 10294-1).
6.1.4 Cc van chn la c c nh trn b mt tng hoc sn
Khi van chn la cch nhit c p c nh vo tng, th yu cu hai th nghim; mt van chn la
bn trong l t v mt bn ngoi l t. Trong trng hp van chn la khng cch in t c nh
theo cch ny, ch cn tin hnh th nghim van chn la bn trong l t, v y c coi l iu kin
khc nghit nht. Xem 6.1.4 ca tiu chun TCVN -1(ISO 10.294-1).
6.1.5 Van chn la t cch xa tng v sn
Xem 6.1.5 ca tiu chun TCVN-1(ISO 10294-1).
6.1.5.1 Bn trong l t
Xem 6.1.5.1 ca tiu chun TCVN -1(ISO 10294-1).
6.1.5.2 Bn ngoi l t
Trong trng hp van chn la khng cch nhit t c nh trong khu vc ng dn ngoi l t th
khng cn phi th nghim. Xem 6.1.5.2 ca tiu chun TCVN-1(ISO 10294-1).
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6.1.6 Ngn cch ti thiu gia cc van chn la
Khong cch nh nht c quy nh gim kh nng nh hng ca mt van chn la ti tnh
nng ca van chn la khc (xem 6.1.6 v hnh 9 ca tiu chun TCVN-1(ISO 10294-1). Gii hn
tng t c th p dng gia thn van v tng l t gim kh nng ngn la t l t chy
khng trc tip tc ng ti van chn la.
6.2 Kch c mu
Xem 6.2 ca tiu chun TCVN-1(ISO 10294-1).
Van chn la vi kch c ln nht phi c th chy v van chn la phi p ng tiu ch r r
khi chy ph hp th kt qu th c th c m rng cho cc van c kch c nh hn m c kch
thc chiu rng, chiu cao v chiu di tng ng nh hn so van c th nghim, theo kim
chng sau:
Tt c cc thnh phn, c bit l cc cnh van chn la, c cng dy, chiu rng cnh v hnh
dng mt ct ngang i vi van chn la dng mn ngn v dng a cnh.
6.3 C cu kch hot nhit
Xem 6.3 ca tiu chun TCVN -1(ISO 10294-1).
Nhn chung c cu kch hot nhit khng phc tp v nu nh gi mt c cu nm an xen th khng
cn thit th nghim vt qu im m ti van chn la ng v c cu khng nh hng n tnh
nng lin quan ti tiu ch nh gi ca van.
i vi cc mc ch ca tiu chun ny, nhit kch hot tnh thng thng l (72 4) oC.
6.4 Lp t mu th
Xem mc 6.4 ca tiu chun TCVN -1(10294-1).
6.5 C cu
Xem 6.5 ca tiu chun TCVN -1(ISO 10294-1)
Nhm gim s ln tin hnh th nghim, tiu chun v c cu c quy nh i vi cc cu trc
va.
Vt liu c t trng thp c quy nh v c qun tnh nhit thp v d on trc c rng nhit
mt khng tip xc cao hn s c xc nh trn van chn la/ng ng. Ngoi ra, vt liu t trng
thp thng c bn c hc thp hn, do c th lin quan n iu kin khc nghit hn. Mt
thun li na l s m bo ng nht kt qu gia cc phng th nghim.
6.6 n nh mu
Xem 6.6 ca tiu chun TCVN-1(ISO 10294-1).
Khi m trong van chn la cao, cu trc v vt liu bt kn s c xu hng to ra nhit thp
hn trn cc b mt khng tip xc. iu ny thng c th c chp nhn bi m rng nhit
mt on bng 100 C. iu ny cng quan trng cho php thi gian cho mt c cu bng
va t cng ph hp.
6.6 S ln th yu cu
Xem 6.1.1 ti 6.1.5 ca tiu chun TCVN-1(ISO 10294-1).
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Phng php th c thit k bao ph cng nhiu ng dng tim nng lp t van chn la
cng tt. Mt chng trnh th nghim khng th mong i c th bao ph tt c cc la chn.
Hng dn c a ra di y v s ln th c th c yu cu. Kinh nghim cho thy rng
khng phi thc hin tt c cc th nghim, v mt la chn lp t c th a ra i din cho iu
kin khc nghit nht, trong trng hp ny s lng th nghim cn thit c th c gim xung.
Bng 2 ng dng lp t van chn la tiu chun
ng dng lp t van chn la theo tiu chun ng dng thc t
S ln th van chn la i xng
S ln th van chn la bt i xng
Lp t bn trong tng 2 1
Lp t bn trong sn 2 1
Bng 3 ng dng lp t van chn la c bit
ng dng lp t van chn la trong thc hnh p dng c bit
S ln th van chn la i xng
S ln th van chn la bt i xng
Lp t bn trong tng 2 1
Lp t bn trong sn 2 1
Van chn la c gn trong khu vc ng ng ca cn chy (p dng cho
tng v sn)
1 cho tng 1 cho tng
1 cho sn 1 cho sn
Van chn la cch nhit c gn trong khu vc ng ng ca cn chy
(p dng cho tng v sn) 1 1
7 Xc nh r r ca ng ni v trm o
Xem iu 7 ca tiu chun TCVN-1(ISO 10294-1).
Gii hn 12 m3/h ph hp cho th nghim chy c chn v iu ny th hin r r thp nht c
th o c chnh xc theo tiu chun TCVN 8113-1 (ISO 5167-1) v ISO 5221. C th a ra xem
xt o mc r r thc t v sau ly r r thu c trong qu trnh th nghim tr i gi tr ny.
Tuy nhin phng php ny s to ra cc vn nh r r ca thit b th nghim c th tng theo
thi gian th nghim. Cch tip cn gim thiu c chp nhn l s dng cht bt kn bt kn tt
c cc im lm gia tng r r ca thit b trong qu trnh th nghim.
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Cn quan tm n vic m vo cc ch bt kn ti cc mi ni v s dng cc cht bt kn s dng
nhit cao thch hp.
8 Xc nh r r nhit mi trng
Xem iu 8 ca tiu chun TCVN-1(ISO 10294-1).
r r ca van chn la nhit mi trng ch c o cho cc van chn la c phn loi theo
r r (S). C van chn la kch c ln nht v nh nht phi c nh gi.
9 Th chy
Xem iu 9 ca tiu chun TCVN-1(ISO 10294-1).
Chn vn tc khng kh l 0,15 m/s do kinh nghim thc tin khng nh ti thi im van chn la
ng c th tn ti mt p lc m rt cao qua van chn la. La chn vn tc khng kh thp v
chng minh c rng trong qu trnh th nghim ti thi im van ng, p lc m c bn khng th
vt qu p lc m yu cu 300 Pa.
Vn tc th chy 0,15 m/s l mt tha thun cn thit cho mt php th nghim lu lng khng kh
ng v an ton chy trong cc phng th nghim th chy. V nhng l do an ton, nu xem xt thy
cn dng th nghim vn tc/p lc cao hn phi thc hin trong iu kin lu lng dng khng
kh xung quanh v khng thc hin khi bung t nhit cao.
Bt c van chn la no khng th ng li trong thi gian cho php l 2 pht phi c coi l khng
t. Nu tin hnh ng van chn la th cng v tip tc th nghim xc nh r r, d liu
c th ch c coi l thng tin v yu cu cn thit cho mt van chn la khng p ng yu cu.
r r s c xc nh t cc b ghi nhit cc b v b ghi chnh lch p sut ti cc tm tit
lu, ng venture, s dng cng thc tnh lu lng th tch dng a ra trong tiu chun
TCVN 8113-1 (ISO 5167-1) v ISO 5221 v cc cng thc b sung trong 5.3.2 ca tiu chun ny.
Chuyn i lu lng dng chy n nhit mi trng xung quanh 20oC (phng th nghim) s
dng cng thc sau:
Trong
qV l lu lng th tch ti iu kin mi trng xung quanh (phng th nghim);
qV,m l lu lng th tch ti iu kin o;
T l nhit cc b ti trm o, theo C.
Ngoi ra qV l mt hm ca thi gian.
10 Bo co th nghim
Xem iu 11 ca tiu chun TCVN -1(ISO 10294-1).
(6)
-
TCVN :2015
16
11 Dn gii v tiu ch v phn loi trong TCVN-2 (ISO 10294-2)
Cc th nghim theo phng php th a ra trong tiu chun TCVN-1(ISO 10294-1) c thc
hin trn c di kch c sn phm van chn la, tt c cn tha mn php o thng thng v tnh
ton vn. Nhng sn phm ang hin ti c th tha mn gii hn r r 360 m3/(h.m2), v gii hn
ny p ng nh gi s tun th tnh ton vn s dng php o lu lng kh (k hiu E).
Lin quan ti r r khi, d liu phn tch c gi tr c kim chng, c tnh n cc thng s nh
nng khi c th chp nhn c, pha long yu cu, thi gian thot nn, nhng thng s ny
dn ti vic a ra mt r r khi c th chp nhn c l 200 m3/(h.m2). Gii hn ny c dng
kim tra vic tun th v k hiu l S.
-
TCVN -3:2017
17
Ti liu tham kho
1. ISO 5221, Air distribution and air diffusion Rules to methods of measuring air flow rate in an air
handling duct. (Phn phi kh v khuch tn kh Cc phng php o lu lng dng trong ng dn
x l kh).
2. ISO 6944, Fire resistance tests Ventilation ducts. (Th nghim kh nng chu la - ng thng gi).