Shell & Tube Heat Exchangers (Lec041)

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Kind: captions
Language: en

00:00:00.030
it started with heaters and coolers okay
00:00:04.039 00:00:04.049 so let's start with these several types
00:00:06.200 00:00:06.210 we have we have the shell and tube heat
00:00:10.390 00:00:10.400 exchanger which is the most common one
00:00:12.830 00:00:12.840 we have plates heaters we have a spiral
00:00:15.589 00:00:15.599 here and we have to learn or double tube
00:00:18.560 00:00:18.570 or double pipe heaters and let's go for
00:00:21.710 00:00:21.720 the first one shell and tube the name
00:00:24.830 00:00:24.840 implies we are going to have a very
00:00:26.540 00:00:26.550 large shell which covers all the inside
00:00:29.480 00:00:29.490 tubes typically you will have plenty of
00:00:31.999 00:00:32.009 tubes
00:00:32.540 00:00:32.550 I mean twenty hundred five hundred etc
00:00:35.540 00:00:35.550 the more tubes you have the more control
00:00:38.780 00:00:38.790 and heat exchange you will have and of
00:00:42.110 00:00:42.120 course it will be more expensive harder
00:00:44.600 00:00:44.610 to maintain and so on so as the name
00:00:47.630 00:00:47.640 implies you have tubes inside and a
00:00:49.400 00:00:49.410 shell outside covering all the tubes you
00:00:52.520 00:00:52.530 got a hot fluid which typically is the
00:00:54.830 00:00:54.840 one with higher temperature and you got
00:00:56.810 00:00:56.820 the cold fluid which is the one with
00:00:58.549 00:00:58.559 lower temperature and you can imagine
00:01:00.619 00:01:00.629 cold fluid is going to increase in
00:01:02.569 00:01:02.579 temperature hot fluid is going to
00:01:04.520 00:01:04.530 decrease in temperature therefore this
00:01:06.740 00:01:06.750 heat exchanger will act as both heater
00:01:10.100 00:01:10.110 and cooler depending on the fluid we can
00:01:13.219 00:01:13.229 have multiple tubes inside different
00:01:15.859 00:01:15.869 arrangement sizing etc and we also add
00:01:20.420 00:01:20.430 baffles because we need to force
00:01:23.120 00:01:23.130 movement so here let me continue with
00:01:26.840 00:01:26.850 the parts of a heat exchanger you will
00:01:30.260 00:01:30.270 have the tube or nozzle so in that goes
00:01:32.690 00:01:32.700 here the fluid goes here you have a head
00:01:35.749 00:01:35.759 cover so the fluid will not go directly
00:01:37.550 00:01:37.560 here so you you are forcing this true
00:01:40.490 00:01:40.500 here these are the baffles which allows
00:01:43.969 00:01:43.979 movement of the fluid therefore the more
00:01:46.969 00:01:46.979 time it takes the more time it has for
00:01:49.609 00:01:49.619 transfer and eventually it goes back all
00:01:52.910 00:01:52.920 the way back here now this was the
00:01:55.940 00:01:55.950 outside outside material the inside
00:01:59.300 00:01:59.310 material will be those on the tubes
00:02:02.209 00:02:02.219 right here
00:02:03.550 00:02:03.560 we have vertical baffles we have
00:02:06.070 00:02:06.080 horizontal baffles we have support
00:02:09.040 00:02:09.050 saddles right here outside so they won't
00:02:11.080 00:02:11.090 Bend or broke we have the shell cover
00:02:14.580 00:02:14.590 typically you they will be also covered
00:02:17.620 00:02:17.630 with material which allows or will not
00:02:21.699 00:02:21.709 allow heat transfer outside the ambient
00:02:24.010 00:02:24.020 and let's get more into the arrangements
00:02:28.479 00:02:28.489 these are the several arrangements you
00:02:31.210 00:02:31.220 can use on shell and tube heat
00:02:33.100 00:02:33.110 exchangers let's verify front end so the
00:02:37.240 00:02:37.250 front end is this size right here you
00:02:41.020 00:02:41.030 can see there are several ways you can
00:02:43.420 00:02:43.430 be arranging also different shell types
00:02:45.970 00:02:45.980 you have this one which is K type then
00:02:49.270 00:02:49.280 you have different cross flow etc and
00:02:51.250 00:02:51.260 the rear end many times you will have no
00:02:55.210 00:02:55.220 actual ends such as this one right here
00:02:57.270 00:02:57.280 that's why it's not a great area
00:03:02.070 00:03:02.080 so remember flip Cozine transfers so it
00:03:07.660 00:03:07.670 cuts out transfers and more specifically
00:03:11.770 00:03:11.780 the different type of configuration this
00:03:14.080 00:03:14.090 is a for this piece k for all these and
00:03:17.170 00:03:17.180 t because there is no extra data you can
00:03:21.460 00:03:21.470 see this is typically used also for
00:03:23.080 00:03:23.090 evaporation this will allow to form
00:03:25.690 00:03:25.700 gases right here also a B II M and you
00:03:29.560 00:03:29.570 can see there is different shells on all
00:03:32.410 00:03:32.420 these actually this one and this one are
00:03:34.810 00:03:34.820 the same a type a type a type and what
00:03:40.479 00:03:40.489 else do we have here well essentially
00:03:41.830 00:03:41.840 what you're changing is that here you
00:03:43.990 00:03:44.000 have different amount of passes so you
00:03:47.800 00:03:47.810 have one tube and then the tubes go back
00:03:50.430 00:03:50.440 whereas in this case the tubes just go
00:03:53.170 00:03:53.180 to the other side so it depends on the
00:03:55.210 00:03:55.220 tab on the number of tubes and so on
00:03:57.580 00:03:57.590 these will change as well
00:04:02.800 00:04:02.810 so the configuration I'm going to get
00:04:06.260 00:04:06.270 that into specifics but very important
00:04:08.930 00:04:08.940 guys to note that you can either have a
00:04:13.760 00:04:13.770 square pitch
00:04:14.870 00:04:14.880 it's queer pitch rotated triangular and
00:04:18.160 00:04:18.170 rectangular rhomboid or whatever even
00:04:22.160 00:04:22.170 triangular whatever shape you can
00:04:24.200 00:04:24.210 imagine on the model you can apply it to
00:04:26.150 00:04:26.160 the configuration of the little tubes
00:04:30.430 00:04:30.440 now it's very important to know how to
00:04:33.590 00:04:33.600 keep maintenance on the tubes inside the
00:04:36.710 00:04:36.720 heater and outside the heater that will
00:04:39.350 00:04:39.360 be the shell so one of the largest
00:04:42.260 00:04:42.270 problems are that you require a magnum
00:04:45.680 00:04:45.690 in order to clean all these little
00:04:48.220 00:04:48.230 fallings right here and the outside of
00:04:51.170 00:04:51.180 the tubes as well more examples
00:04:54.380 00:04:54.390 this one is outside the tubes that will
00:04:57.170 00:04:57.180 be inside the shell outside the little
00:04:59.600 00:04:59.610 tubes you can see the outside material
00:05:02.360 00:05:02.370 it might also be very caustic or may be
00:05:05.900 00:05:05.910 all dirt or not clean with impurities
00:05:09.110 00:05:09.120 costs falling etc
00:05:14.590 00:05:14.600 [Music]
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