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shell and tube heat exchanger working principle

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Kind: captions
Language: en

00:00:01.730
[Music]
00:00:07.900 00:00:07.910 baby being of us heat transfer is a
00:00:10.510 00:00:10.520 wholly owned subsidiary of ABB Asia
00:00:13.180 00:00:13.190 Brown Boveri the services range from
00:00:16.450 00:00:16.460 design engineering to full scope lump
00:00:19.000 00:00:19.010 sum turnkey projects offering fired
00:00:21.609 00:00:21.619 heaters plate type exchanges and
00:00:23.830 00:00:23.840 advanced shell-and-tube exchanges ABB
00:00:27.970 00:00:27.980 Lummis heat transfer has designed and
00:00:30.400 00:00:30.410 supplied more than 20,000 shell and tube
00:00:33.100 00:00:33.110 heat exchangers over the last 60 years
00:00:35.790 00:00:35.800 it wasn't until recently that segmental
00:00:39.340 00:00:39.350 baffles of shell and tube designs were
00:00:41.800 00:00:41.810 considered to be the only solution to
00:00:43.840 00:00:43.850 provide tube support and to improve the
00:00:46.990 00:00:47.000 shell side flow however the stream
00:00:50.410 00:00:50.420 follows a zigzag path through the shell
00:00:53.700 00:00:53.710 to create a more continuous flow through
00:00:56.830 00:00:56.840 the shell a helical stream is the most
00:00:59.380 00:00:59.390 logical answer to facilitate this flow
00:01:02.470 00:01:02.480 the helical baffle system has been
00:01:04.689 00:01:04.699 developed this unique design does not
00:01:08.380 00:01:08.390 only improve the heat transfer it also
00:01:10.990 00:01:11.000 minimizes fouling and reduces the
00:01:13.450 00:01:13.460 pressure drop and can even reduce the
00:01:16.059 00:01:16.069 total plant investment costs not
00:01:19.090 00:01:19.100 surprisingly it was awarded with the
00:01:21.160 00:01:21.170 name helix changer by obstructing the
00:01:25.450 00:01:25.460 flow with segmental baffles a high
00:01:27.819 00:01:27.829 fouling tendency occurs in the dead
00:01:29.889 00:01:29.899 zones behind the baffles depending on
00:01:32.709 00:01:32.719 the fluid this shortens the run length
00:01:34.989 00:01:34.999 significantly
00:01:36.480 00:01:36.490 the heel exchanger has no dead zones
00:01:39.240 00:01:39.250 because of the smooth guidance of the
00:01:41.160 00:01:41.170 flow so fouling is minimized under long
00:01:44.430 00:01:44.440 run length can be expected every shell
00:01:48.960 00:01:48.970 and tube arrangement has a pressure drop
00:01:51.300 00:01:51.310 or a great deal caused by the baffle
00:01:53.700 00:01:53.710 arrangement compared to the conventional
00:01:56.639 00:01:56.649 systems the smooth guidance of the flow
00:01:59.460 00:01:59.470 in the heel exchanger can improve the
00:02:01.740 00:02:01.750 shell side pressure drop up to 50
00:02:03.870 00:02:03.880 percent
00:02:06.440 00:02:06.450 00:02:07.980 00:02:07.990 we're with segmental baffles the shell
00:02:10.930 00:02:10.940 side fluid has zones with various speeds
00:02:13.660 00:02:13.670 causing inefficient heat transfer the
00:02:16.720 00:02:16.730 heel exchanger has an equal flow through
00:02:19.240 00:02:19.250 almost the entire shell leaving no space
00:02:22.060 00:02:22.070 are used for heat transfer and therefore
00:02:24.640 00:02:24.650 having outstanding heat transfer rates
00:02:27.580 00:02:27.590 00:02:30.480 00:02:30.490 the heel exchanger is extremely suitable
00:02:33.550 00:02:33.560 to replace segmental baffled bundles in
00:02:36.040 00:02:36.050 existing shell and tube arrangements one
00:02:39.370 00:02:39.380 simply pulls the conventional two
00:02:41.530 00:02:41.540 bundles out and inserts helical baffled
00:02:44.500 00:02:44.510 bundles with all the helical advantages
00:02:46.870 00:02:46.880 and this increases the capacity with up
00:02:50.230 00:02:50.240 to twenty percent another option is to
00:02:54.520 00:02:54.530 replace conventional trains with a lower
00:02:56.920 00:02:56.930 number of heel exchanges maintaining the
00:02:59.680 00:02:59.690 same capacity while saving plots' space
00:03:02.200 00:03:02.210 and reducing costs in new plant designs
00:03:06.640 00:03:06.650 the heel exchanger can even affect the
00:03:09.340 00:03:09.350 total arrangement of the exchanger
00:03:11.050 00:03:11.060 trains and the auxiliary equipment which
00:03:13.930 00:03:13.940 will have considerable positive impact
00:03:16.210 00:03:16.220 on the investments helix is a changer
00:03:20.110 00:03:20.120 it's the turning point it's more heat
00:03:23.979 00:03:23.989 transfer it's less fouling it's less
00:03:28.510 00:03:28.520 pressure drop for less money helix is a
00:03:32.770 00:03:32.780 changer it is
00:03:35.140 00:03:35.150 00:03:45.410 00:03:45.420

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