UCS & URCS Series selection
STEP 4: Calculate the area required
Q ( BTU / HR )
504,000
Required Area sq.ft. =
= 28.5 sq.ft.
LMTD c x U ( from table C)
177.3 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 = 28.5sq.ft Closest model required based upon sq.ft. & series = UCS - 1248 - 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 corresponding information, please contact our engineering services department for further assistance.
TABLE A- FACTOR M/LMTD = L x M
TABLE D- Surface Area in Sq. ft. for UCS & URCS Series
S/L
M
S/L
M
S/L
M
S/L
M
Model Number Code
Model Number Code
1/4” O.D. Tubing Code 6
3/8” O.D. Tubing Code 6
5/8” O.D. Tubing Code 10
1/4” O.D. Tubing Code 4
.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 .864 .879 .886 .890 .896 .902 .907 .913 .918 .923 .928 .934 .939 .944 .949 .955 .959 .964 .970 .975 .979 .986 .991 .995
.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
1024 1036 1048 1224 1236 1248 1260 1272 1284 1724 1736 1748 1760 1772 1784 2036 2048 2060 2072 2084
11.0 16.5 22.0 17.3 25.9 34.5 43.2 51.8 60.5
6.5 9.8 13.0 9.1 13.7 18.3 22.9 27.5 32.0 17.0 25.5 34.0 42.5 51.0 59.5 41.2 55.0 68.7 82.5 96.2
614 624 630 636 712 718 724 730 736 814 824 830 836
3.6 6.8 7.8 9.4
3.4 5.1 6.8 8.5 10.2 7.0 12.0 15.1 19.2
32.2 48.3 64.4 80.5 96.6 112.7 80.1 106.8 133.5 160.2 186.9
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
Max. Liquid Flow - Shell Side Liquid Flow - Tube Side Baffle Spacing TP FP 1.5 2 3 4 6 Min. Max. Min. Max.
Shell dia. Code
.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
600 15 20 25 30 – 3.5 24 2 12 800 20 34 45 60 – 4.5 38 3 21 1000 30 36 50 65 – 10 70 5 37 1200 45 50 70 100 125 15 112 7.5 56 1700 50 65 100 140 220 29 180 14 90 2000 – – 140 190 320 45 320 25 160
R
5.0 1 .982 .917 6.0 1 .968 .885
8.0 1 .930 10.0 .996 .880 12.0 .985 .720
TABLE C
TUBE FLUID SHELL FLUID
U
14.0 .972 16.0 .958 18.0 .940 20.0 .915
400 350 100 300 90
Water Water Water
Water 50% E. Glycol Oil 50% E. Glycol Oil
50% E. Glycol 50% E. Glycol
K
note: AIHTI reserves the right to make reasonable design changes without notice.
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