ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
ၚ
ঠ
ΚƑܾ
2005-8-2 1
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
జజ <ސ
<ސ
?8-1
?8-2 ސ
?8-3 ސ၏
2005-8-2 2
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
??88--11
_֧
1
ऋȏȏ_
ऋȏ
Q = kF∆t
Qऋȏऋ WF
m2 ∆ऋȏऋȏt
(oCk$% W/( oC #"!֧
2005-8-2 3
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
tf1 h1
*_֧ऋȏ()$'8
tw1 >-_֧, ސ
ඪ0ސ*_֧ऋȏ
q
1ၠ ,ऋȏ"345 <
tf1 tw2
6_֧> 45%$ސ
tf2 h1 h2, h2 tf2
345":9_78֧ 3
tw1
_֧ǎ<ி>?***@A >
tw2
G HऋBCD8AE
t - t t − t t − t
Q = f1 w1 = w1 w2 = w2 f 2
1 δ 1
Fh1 Fλ Fh2
2005-8-2 4
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
t - t t − t t − t
Q = f1 w1 = w1 w2 = w2 f 2
1 δ 1
Fh1 Fλ Fh2
t - t
q = f1 f2 k(t −= t )
1 δ 1 f 1 f 2
+ +
h1 λ h2
_֧ k = ( 1 +δ+ 1 )−1
h λ h
1 1 $% Ρȉ
W/(m2k)
2005-8-2 5
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
LऋސᇔNސOPQ<ސR
Sސ
T၏VWɑ YZᇔNސ[0L
ऋސ \ˣᇔN*$%
hr
Qr
hr =
F() tw− t f
ᇔNސ
Qr
S*$%^ǎLऋ*$%
hc
ᇔN*$% <
hr
2005-8-2 6
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
h= hc + h r
_ސBCD0 H
Q= Qc + Q r =( h c + h r) F( t w − t f) = hF( t w − t f )
2 శ_
`$()ऋȏaశ_*ސ
,aశ_-<ऋȏaశ_*
ސඪ0
2005-8-2 7
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Science & Engineering
1ၠ ,ऋȏ"345 <
tf1
ސ$%45 < aశ_ tf1 h1
tf2 h1 h2,
, deؖCgh345˷
d1 d2
<l,8aశ_˷d_"345 Q
< ǎ<ி>?***@A d h t
tw1 tw2 1 2 f2
aశ_ऋBCD8A
d2
G HE
π
t - t t − t tw2 − t f 2
Q = f1 w1 = πλw1 w2 =
1 1 d2 1
ln
d1lh1 2 l d1 πd2lh2
2005-8-2 8
ΚƑܾ
ҔᏄҚ
HUST Lab of Thermal Scienceπ& Engineering
t -
8传热过程和换热器 来自淘豆网www.taodocs.com转载请标明出处.