AA & STA Series selection
STEP 4: Calculate the area required
89,090
Q ( btu / hr )
= 17.68 sq.ft.
Required Area sq.ft. =
LMTD c x U ( from table c)
50.39 x 100
STEP 5: Selection a) From table e choose the correct series size, baffle spacing, and number of passes that best fits your flow rates for both shell and tube side. Note that the tables suggest minimum and maximum information. Try to stay within the 20-80 percent range of the indicated numbers. Example Oil Flow Rate = 80 GPM = Series Required from Table E = 1200 Series Baffle Spacing from Table E = 4 Water Flow Rate = 40 GPM = Passes required in 1200 series = 4 (FP) b) From table d choose the heat exchanger model size based upon the sq.ft. or surface area in the series size that will accommodate your flow rate. Example Required Area = 17.68sq.ft Closest model required based upon sq.ft. & series = AA-1224-4-6-FP If you require a computer generated data sheet for the application, or if the information that you are trying to apply does not match the corre- sponding information, please contact our engineering services department for further assistance.
TABLE A- FACTOR M/LMTD = L x M
TABLE D- Surface Area
Surface Area in Sq.ft.
1/4" O.D 3/8" O.D 5/8 O.D Surface Area in Sq.ft.
S/L
M
S/L
M
S/L
M
S/L
M
Model Number
Model Number
1/4" O.D 3/8" O.D
5/8 O.D Tubing
.25 .26 .27 .28 .29 .30 .31 .32 .33 .34 .35 .36 .37 .38 .39 .40 .41 .42 .43 .44 .45 .46 .47 .48 .49
.541 .549 .558 .566 .574 .582 .589 .597 .604 .612 .619 .626 .634 .641 .648 .655 .662 .669 .675 .682 .689 .695 .702 .709 .715
.50 .51 .52 .53 .54 .55 .56 .57 .58 .59 .60 .61 .62 .63 .64 .65 .66 .67 .68 .69 .70 .71 .72 .73 .74
.721 .728 .734 .740 .746 .753 .759 .765 .771 .777 .783 .789 .795 .801 .806 .813 .818 .823 .829 .836 .840 .848 .852 .858 .864
.75 .76 .77 .78 .79 .80 .81 .82 .83 .84 .85 .86 .87 .88 .89 .90 .91 .92 .93 .94 .95 .96 .97 .98 .99
.870 .874 .879 .886 .890 .896 .902 .907 .913 .918 .923 .928 .934 .939 .944 .949 .955 .959 .964 .970 .975 .979 .986 .991 .995
Tubing
Tubing
Tubing
23.55 Tubing
11.78 Tubing
.01 .02 .03 .04 .05 .06 .07 .08 .09 .10 .11 .12 .13 .14 .15 .16 .17 .18 .19 .20 .21 .22 .23 .24
.215 .251 .277 .298 .317 .334 .350 .364 .378 .391 .403 .415 .427 .438 .448 .458 .469 .478 .488 .497 .506 .515 .524 .533
AA-1224
33.76
AA-408
1.35
–
–
AA-1236
50.63
35.33
17.66
AA-1248
67.51
47.10
23.55
AA-608
2.62
–
–
AA-1260
87.39
58.88
29.44
AA-614
4.58
–
–
AA-1272
101.27
70.65
35.33
AA-624
7.85
–
–
AA-1284
118.14
82.43
41.21
AA-636
11.78
–
–
AA-1296
135.02
94.20
47.10
AA-814
8.55
–
–
AA-1624
58.61
41.21
23.55
AA-824
14.65
–
–
AA-1636
87.92
61.82
35.33
AA-836
21.2
–
–
AA-1648
117.23
82.43
47.10
AA-848
28.3
–
–
AA-1660
146.53 103.03
58.88
AA-1672
175.84 123.64
70.65
AA-1014
13.74
9.16
4.58
AA-1684
205.15 144.24
82.43
AA-1024
23.55
15.70
7.85
AA-1696 94.20 AA-16108 263.76 185.46 105.98 AA-16120 293.07 206.06 117.75 234.45 164.85
AA-1036
35.33
23.55
11.78
AA-1048
47.10
31.40
15.70
AA-1060
58.88
39.25
19.63
TABLE E- Flow Rate for Shell & Tube
TABLE B- LMTD correction factor for Multipass Exchangers .05 .1 .15 .2 .25 .3 .35 .4 .45 .5 .6 .7 .8 .9 1.0 .2 1 1 1 1 1 1 1 .999 .993 .984 .972 .942 .908 .845 .71 .4 1 1 1 1 1 1 .994 .983 .971 .959 .922 .855 .70
Shell Max. liquid Flow - Shell Side
Liquid Flow - Tube Side
dia .
Baffle Spacing
SP
TP
FP
Code 1.5 2
3
4
6 Min. Max. Min. Max. Min. Max.
.6 1 1 1 1 1 .992 .980 .965 .948 .923 .840 .8 1 1 1 1 .995 .981 .965 .945 .916 .872 1.0 1 1 1 1 .988 .970 .949 .918 .867 .770 2.0 1 1 .977 .973 .940 .845 .740 3.0 1 1 .997 .933 .835 4.0 1 .993 .950 .850
400
10
19
–
–
– 3.5 20
–
–
–
–
600
15
20 25 30
– 7.5 48 3.5 24
2
12
800
20
35 45 60
–
10
70 4.5 38
3
21
1000 24
35 60 70
–
20 120 10 70 5.0 37
R
1200 35
45 70 100 120 30 220 15 112 7.5 56
5.0 1 .982 .917 6.0 1 .968 .885
1600 38
70 150 200 220 57 300 29 180 14
90
8.0 1 .930 10.0 .996 .880 12.0 .985 .720
TABLE C
TUBE FLUID
SHELL FLUID Water 50% E. Glycol Oil 50% E. Glycol Oil
U
14.0 .972 16.0 .958 18.0 .940 20.0 .915
400 350 100 300 90
Water Water Water
50% E. Glycol 50% E. Glycol
K
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47
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