Transcript *

Heat Exchanger Correlations
PARALLEL FLOW
COUNTER FLOW
T
T
TH
HOT FLUID
T1
TLM
T
T2
TC
COLD FLUID
dA
T1
Q  C H TH  CC TC
UA    Cmin=min(CH,CC)
TH
HOT FLUID
T
TC
T2
COLD FLUID
dA
A
Tmax
TLM
A
Tmean

Q
 (UA)( FTLM )  (m c p ) H TH  (m c p )C TC    Cmin Tmax
Rtotal
TH  TH ,in  TH ,out
TC  TC ,out  TC ,in
1
T1  T2
U

TdA

;

UA A
 T1 

ln 
 T2 
CH  (m c p ) H
CC  (m c p )C
TLM 
  
Q





Q max 
UA  
Tmax  TH ,in  TC ,in
Tmean  FTLM
Cmin  min CH , CC 

Q
UA
C

; NTU 
;     NTU , min
Cmin Tmax
Cmin
Cmax



